JP6992638B2 - Radiation imaging system - Google Patents

Description

The present invention relates to a radiography system.

In order to take an image with an imaging device, it is necessary to match the exposure timing of the radiation control device with the reading timing of the imaging device. In continuous shooting (hereinafter referred to as serial shooting) that generates images of multiple frames in accordance with pulse irradiation, the shorter the interval between frames, the shorter the accumulation period of the shooting device, so the irradiation timing and readout timing are highly accurate (hereinafter referred to as serial shooting). In some cases, control on the order of several ms to several hundred μs) is required.
Timing synchronization is generally performed by exchanging timing information related to exposure and reading between the imaging device and the radiation control device. Wired communication between the radiation control device and the imaging device using a dedicated line has the advantage of enabling highly accurate timing control, but on the other hand, when the imaging device is placed directly under the patient for imaging, the imaging device There was a drawback that it was difficult to handle and shoot.
Therefore, it is required to make the photographing device wireless, but the communication method between the radiation control device and the photographing device is wireless communication using the best effort type arbitration by the CSMA / CA method such as IEEE802.11. When the standard is used, since the adjustment time of packet transmission is indefinite, the communication delay varies, and there is a problem in realizing highly accurate timing control.
The following technologies have been proposed to address these issues.

Patent Document 1 describes a photographing device that starts reading when a first counter that is reset according to a beacon signal of a wireless communication standard and restarts counting reaches a specified time, and a first counter that is reset according to a beacon signal and restarts counting. A radiography system equipped with a radiation control device, which instructs the start of exposure when the second counter reaches a specified time, is described.
Further, in Patent Document 1, a deviation in the beacon transmission timing may occur in a wireless communication standard using best-effort type arbitration by the CSMA / CA method such as IEEE802.11, and exposure and reading may occur at a desired timing. Since there is a problem that cannot be done, it is also described to prevent the deviation of the beacon transmission timing by stopping the wireless communication of the own system when the beacon signal is transmitted.

Patent Document 2 describes a radiation control device that instructs the start of exposure when the first timekeeping means reaches a predetermined time, and the imaging device starts reading when the second timekeeping means reaches a predetermined time. It is described that the timing of exposure and reading is matched by synchronizing the time of the first timekeeping means and the time of the second timekeeping means in the photographing device provided with the photographing device.
In still image shooting, a method of determining the reading timing from the irradiation detection timing by the radiation sensor is widely used.

Japanese Unexamined Patent Publication No. 2009-186439 Japanese Unexamined Patent Publication No. 2010-081960

The technique described in Patent Document 1 states that it is possible to prevent variations in the communication delay of the beacon signal by stopping the wireless communication of the own system when the beacon signal is transmitted. However, the communication standard called 802.11 adopted by the technique described in Patent Document 1 is adopted in a large number of devices. In addition, with the spread of tethering, the number of devices that function as master units is increasing. Therefore, wireless communication that cannot be controlled by the system occurs around the photographing system described in Patent Document 1 at various timings, and simply stopping the wireless communication of the own system causes a communication delay of the beacon signal. It is not possible to prevent variation, and it is difficult to control exposure at a stable timing.
That is, it can be said that the synchronous control by the photographing system described in Patent Document 1 cannot withstand a general wireless communication environment.

Further, the technique described in Patent Document 2 synchronizes the time of the first timekeeping means of the imaging device and the second timekeeping means of the radiation control device, and starts exposure and reading using the time of each timekeeping means. If the time synchronization accuracy is maintained high enough, the exposure and read timing can be matched.
However, during a series of exposures and readouts, an abnormality occurs in the time synchronization function (for example, the first timekeeping means and the second timekeeping means at the time of the third device other than the radiation control device and the imaging device. In the configuration where the timekeeping means is synchronized, the power of the third device is turned off or restarted, and the time changes suddenly), the time synchronization accuracy deteriorates, the timing of exposure and reading does not match, and shooting is performed. It won't work.

Further, in still image shooting, a method of determining the reading timing from the irradiation detection timing by the radiation sensor is widespread, but if the dose reaching the radiation sensor is low, it cannot be detected or the detection takes time (for example, irradiation start). It may take about 10 ms from to detection). Since a large number of images are taken in serial photography, the dose per frame is often kept lower than the dose of one still image, and it is difficult to achieve the required timing accuracy by the method using a radiation sensor. ..
On the other hand, there is a way to adopt a high-sensitivity radiation sensor, but the higher the sensitivity, the more expensive the radiation sensor, and the higher the manufacturing cost of the imaging system.

The present invention has been made in view of the above problems, so that serial imaging can be stably performed in a radiography system that synchronizes a radiation irradiation device and a radiography device by using a plurality of time measuring means. The purpose is to do.

In order to solve the above problems, the radiography system according to the present invention is used.
A reference time device having a first timekeeping means for timekeeping,
The second timekeeping means and the third timekeeping means for timekeeping,
A radiation control device that irradiates radiation from a radiation tube when the time value of the second time measuring means reaches the first predetermined value.
An image of a radiation image based on the charge generated in the radiation detection unit when the radiation detection unit that generates an electric charge by receiving radiation and the time measurement value of the third timekeeping means become the second predetermined value. A reading unit for reading data, and a radiographic imaging apparatus having the same.
The second timekeeping means and the third timekeeping means can set their own operation mode to a synchronization mode that repeatedly synchronizes with the first timekeeping means at a predetermined timing .
At least one of the second timekeeping means and the third timekeeping means
A determination means for determining whether or not a predetermined condition is satisfied, and
It has a means for switching the operation mode to a self-propelled mode in which time is measured at a predetermined timing without repeated synchronization when it is determined that the determination means satisfies a predetermined condition. It is characterized by that.

According to the present invention, wireless serial imaging can be stably performed.

It is a block diagram which shows the structure of the radiography system which concerns on embodiment of this invention. FIG. 3 is a block diagram showing a specific configuration of a radiation control device included in the radiography system of FIG. 1. It is a block diagram which shows the specific structure of the radiological imaging apparatus included in the radiological imaging system of FIG. 1. It is a block diagram which shows an example of the structure of the access point provided in the radiography system of FIG. It is a block diagram which shows the other configuration of the radiological imaging system which concerns on the same embodiment. It is a timing chart which shows an example of the operation of the radiological imaging system of FIG. 6 is an imming chart showing another example of the operation of the radiography system of FIG. It is a block showing the configuration of the radiography system related to the incidental technology. FIG. 3 is a block diagram showing a specific configuration of a radiation control device included in the radiography system of FIG. 8. It is a block diagram which shows the specific structure of the radiological imaging apparatus included in the radiological imaging system of FIG. It is a timing chart which shows the basic operation of the radiological imaging system of FIG. It is a figure showing the timekeeping information of each timekeeping part when the photographing system of FIG. 8 operates. It is a block diagram which shows the functional structure of the radiological imaging apparatus of FIG. It is a block diagram which shows the functional structure of the radiation control apparatus of FIG. It is a timing chart which shows the operation of the radiation control apparatus of FIG. 9 or the radiography apparatus of FIG. It is a timing chart which shows the operation of the radiation control apparatus of FIG. 9 or the radiography apparatus of FIG. It is a timing chart which shows the operation of the radiation control apparatus of FIG. 9 or the radiography apparatus of FIG. It is a block representing another configuration of the radiographic apparatus provided in the radiological imaging system of FIG. It is a timing chart which shows the operation of the radiological imaging system provided with the radiological imaging apparatus of FIG. FIG. 3 is a block diagram showing another configuration of the radiography apparatus included in the radiography imaging system of FIG. It is a timing chart which shows the operation of the radiological imaging system provided with the radiological imaging apparatus of FIG. It is a block diagram which shows the structure of the radiological imaging system which concerns on Example 1-1. It is a block diagram which shows the structure of the radiological imaging system which concerns on Example 1-2. It is a block diagram which shows the structure of the radiological imaging system which concerns on Example 1-3. It is a block diagram which shows the structure of the radiological imaging system which concerns on Example 1-4. It is a block diagram which shows the structure of the radiological imaging system which concerns on Example 1-5. It is a block diagram which shows the structure of the radiological imaging system which concerns on Example 1-6. It is a block diagram which shows the structure of the radiological imaging system which concerns on Example 1-7. It is a block which shows the specific structure of the radiological imaging apparatus provided in the radiological imaging system according to the first-8th embodiment. It is a timing chart which shows the operation of the radiological imaging system provided with the radiological imaging apparatus of FIG. 23. It is a timing chart which shows the operation of the radiological imaging system which concerns on Example 1-9. It is a timing chart which shows the operation of the radiological imaging system which concerns on Example 1-11. It is a flowchart which shows the operation of the radiological imaging system which concerns on Example 2-1. It is a flowchart which shows the operation of the radiological imaging system which concerns on Example 2-2. It is a flowchart which shows the operation of the radiological imaging system which concerns on Example 2-3. It is a flowchart which shows the operation of the radiological imaging system which concerns on Example 2-4. It is a perspective view of the radiological imaging apparatus included in the radiological imaging system according to the second-5th embodiment. It is a graph which shows the operation of the radiological imaging system which concerns on Example 3-1. It is a graph which shows the operation of the radiological imaging system which concerns on Example 3-2. It is a graph which shows the operation of the radiological imaging system which concerns on Example 3-3. It is a graph which shows the operation of the radiological imaging system which concerns on Example 4-1. It is a graph which shows the operation of the radiological imaging system which concerns on Example 4-2. It is a flowchart which shows the operation of the radiological imaging system which concerns on Example 4-3. It is a graph which shows the operation of the radiological imaging system which concerns on Example 5-1. (A) is a graph showing the relationship between temperature and timekeeping speed, and (b) is a graph showing the operation of the radiography system according to the first and second embodiments of Examples 5-3. It is a flowchart which shows the operation of the radiological imaging system which concerns on Example 6-2. It is a flowchart which shows the operation of the radiological imaging system which concerns on Example 6-3. It is a flowchart which shows the operation of the radiological imaging system which concerns on Example 6-4. It is a flowchart which shows the operation of the radiological imaging system which concerns on Example 6-5. It is a flowchart which shows the operation of the radiological imaging system which concerns on Example 6-6. It is a flowchart which shows the operation of the radiological imaging system which concerns on Example 7-1. It is a flowchart which shows the operation of the radiological imaging system which concerns on Example 7-2. It is a flowchart which shows the operation of the radiological imaging system which concerns on Example 7-3. It is a flowchart which shows the operation of the radiological imaging system which concerns on Example 9-1. It is a flowchart which shows the operation of the radiological imaging system which concerns on Example 9-2. It is a block diagram which shows the structure of the radiological imaging system which concerns on Example 11-1. It is a block diagram which shows the structure of the radiological imaging system which concerns on Example 11-2. It is a block diagram which shows the structure of the radiological imaging system which concerns on Example 11-3.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the technical scope of the present invention is not limited to those illustrated in the drawings.

[Configuration of radiography system]
First, the outline of the radiography imaging system (hereinafter referred to as imaging system 100) of the present embodiment will be described. FIG. 1 is a block diagram showing a schematic configuration of a photographing system 100.

As shown in FIG. 1, the imaging system 100 of the present embodiment includes a radiation irradiation device (hereinafter, irradiation device 1), an access point (hereinafter, AP2), and one or more radiation imaging devices (hereinafter, imaging device 3). , A console 14, and the like.
The irradiation device 1 and AP2, and the AP2 and the photographing device 3 can communicate with each other. That is, the irradiation device 1 and the photographing device 3 can communicate with each other via the AP2.
Further, the imaging system 100 can communicate with a radiological information system (RIS), a picture archiving and communication system (PACS), and the like (not shown).

The irradiation device 1 generates radiation (X-rays or the like) and irradiates the subject S and the photographing device 3 arranged behind the subject S with the radiation R. A radiation control device (hereinafter referred to as a control device 12) and a radiation tube. It is composed of a sphere (hereinafter referred to as a tube 13) or the like.

The control device 12 is adapted to apply a voltage corresponding to a preset irradiation condition of radiation to the tube 13 based on the irradiation start operation by the user.
The specific configuration of the control device 12 will be described later.

When a voltage is applied from the control device 12, the tube 13 generates radiation R having a dose corresponding to the voltage only for the time when the voltage is applied.
That is, the tube 13 is continuously irradiated with radiation R when a voltage is continuously applied from the control device 12, and is irradiated with pulsed radiation R when a pulsed voltage is applied. There is.

The console 14 is composed of a PC, a mobile terminal, or a dedicated device.
Further, the console 14 can perform various image processing on the received image data as needed.
Further, the console 14 has a display unit (not shown), and can display a radiographic image based on image data.

Further, the console 14 can set the shooting mode.
In the present embodiment, there are two types of shooting modes, a still image shooting mode and a serial shooting mode, and it is possible to select one of them.
The still image shooting mode is a shooting mode in which a single radiation image is generated by irradiating the radiation R having a time width set in the irradiation condition only once with one exposure start operation.
The serial imaging mode is an imaging mode in which one or more irradiation start operations are performed to irradiate pulsed radiation R having a time width set by irradiation conditions one or more times to generate one or more radiation images.
Further, the console 14 can set the frame rate when the serial shooting is set as the shooting mode. The frame rate may be an arbitrary numerical value input by the user, or may be selected from a plurality of options (for example, 15 frames / s (hereinafter, fps), 7.5 fps, 30 fps, etc.).

The AP2 includes a communication unit and relays communication between the irradiation device 1 and the photographing device 3.
The communication unit is provided with an antenna and a connector, and is capable of performing both wired communication and wireless communication.
Further, the communication unit repeatedly transmits the beacon to the irradiation device 1 and the photographing device 3 at a predetermined cycle.
The AP 2 may be built in the irradiation device 1 or the photographing device 3 instead of being provided separately from the irradiation device 1 and the photographing device 3.

The imaging device 3 generates image data by receiving radiation R from the irradiation device 1.
The details of the photographing apparatus 3 will be described later.

The imaging system 100 of the present embodiment configured in this way can perform radiography of the subject S by irradiating the subject S arranged in front of the imaging device 3 with the radiation R from the irradiation device 1. It has become.
If the shooting mode is set to the still image shooting mode on the console 14 and the image is taken, one still image is obtained, and if the shooting mode is set to the serial shooting mode and the image is taken, a dynamic image consisting of a series of a plurality of images is obtained. Be done.
Hereinafter, a series of a plurality of images obtained by serial photography will be referred to as a dynamic image, and individual images constituting the dynamic image will be referred to as a frame image.

Note that FIG. 1 illustrates a case where the AP2 and the irradiation device 1 and the AP2 and the photographing device 3 both perform wireless communication as the photographing system 100, but the photographing system 100 according to the present embodiment is the timekeeping information source device 2 and 2. 4 and the irradiation device 1, and at least one of the timekeeping information source devices 2 and 4 and the photographing device 3 may be configured to communicate wirelessly. For example, as shown in FIG. 8, the AP2 and the irradiation device 1 are wired. It can also be a connected configuration.
By doing so, the synchronization accuracy between the control device 12 and the AP2 can be maintained in a sufficiently high state, so that it is not necessary to provide the control device 12 with an operation mode switching function, and the control device 12 is inexpensive. Will be able to be manufactured at.
It is also possible to change the IF of the photographing device 3 from wireless communication to wired communication, and further connect the AP 2 and the photographing device 3 with a dedicated line.
By doing so, it is not necessary to give the photographing apparatus 3 a function of switching the operation mode.

Further, the imaging system 100 of the present embodiment configured in this way can be installed and used, for example, in a imaging room of a hospital, or can be moved by configuring the irradiation device 1 as a round-trip vehicle with wheels. It can also be used as a possible system. If it is possible to move, it is possible to go to the subject S (subject S), which is difficult to move, and take a radiographic image.

For example, when taking a picture using a photography table installed in a hospital's photography room, a wired cable may be connected to the photography device 3 installed in the photography table to send and receive information to and from the irradiation device 1. It is possible to supply electric power to the photographing apparatus 3.
For example, when a wired cable is used to connect to the photographing device 3, by including a pulse signal or a timing signal in the signal of the wired cable, it is possible to take a picture at the same timing of the irradiation device 1 and the photographing device 3. Become.
However, for example, even when shooting in a shooting room, it may be necessary to shoot while sitting on a wheelchair or bed. In such a case, when shooting with a wired cable attached to the shooting device 3, shooting is performed.
・ Cable gets in the way ・ There is a risk that the cable will come off and communication will not be possible ・ There is a problem in terms of hygiene because the cable touches the subject, and there is a request to shoot without using a wired cable was there.

When moving in a round-trip car and taking pictures, the pictures will be taken in the ward where the subject is being treated. In this case, the image is taken on the bed where the subject is sleeping, and it is necessary to insert a radiological imaging device between the subject and the bed to perform the image. Therefore, there are problems such as the cable getting in the way, the risk of the cable coming off and communication becoming impossible, and the problem of hygiene because the cable touches the subject, more than in the case of the above-mentioned shooting room. There was a request to shoot without using.
In particular, there is no need for a wired cable when shooting with CR before the radiography device using FPD, and there is a desire to shoot without using a wired cable in order to obtain the same ease of operation as CR. was there.
However, by using the imaging system 100 according to the present embodiment, it is possible to configure a round-trip vehicle that meets these demands.

[Structure of radiation control device]
Next, a specific configuration of the control device 12 included in the irradiation device 1 will be described. FIG. 2 is a block diagram showing a specific configuration of the control device 12.

As shown in FIG. 2, the control device 12 according to the present embodiment has a radiation control unit 121, a high voltage generation unit 122, a storage unit 123, a communication unit 124, an irradiation side timing unit 125, and a second irradiation side timing unit 126. , Display unit 127, operation unit 15, and the like.

The radiation control unit 121 is based on a control signal from the console 14 or the operation panel 15, and various imaging conditions (conditions related to the subject S such as the imaging target site and physique, tube voltage, tube current, irradiation time, and current time product). Conditions related to irradiation of radiation such as) can be set. Then, based on the reception of the imaging start signal from the exposure switch 15a, it is configured to transmit control information instructing the high voltage generation unit 122 to start applying a voltage (irradiation of radiation).

The storage unit 123 is composed of a SRAM (Static RAM), a SDRAM (Synchronous DRAM), a NAND flash memory, an HDD (Hard Disk Drive), and the like.

The communication unit 124 is a communication means in the present invention, and includes an antenna and a connector for communicating with the outside.
Further, the communication unit 36 can select whether to perform wireless communication or wired communication based on a control signal from the outside. That is, when wireless communication is selected, wireless communication using an antenna can be performed, and when wired communication is selected, information can be transmitted / received by using a wired LAN or the like. If you want to perform synchronization using wired communication, for example, a protocol such as NTP (Network Time Protocol) or the international standard IEEE Std. Synchronization can be performed by using a method as defined in 1558-2008 (hereinafter abbreviated as IEEE1588).

The irradiation-side timekeeping unit 125 is the second timekeeping means in the present invention, and starts timekeeping when the power is turned on or when a predetermined control signal is received from the outside, and generates timekeeping information. It is configured as.
The output from the irradiation side timing unit 125 may be used as timing information such as pulses at regular intervals, or the time such as year, month, day, hour, minute, second, or the number of counts counted up at regular intervals from a certain point in time. It may be used as time information such as.
The irradiation side timing unit 125 may be provided outside the control device 12 instead of being built in the control device 12.
Further, in recent years, there is also a wireless LAN chip that is equipped with a time synchronization function (Timing Synchronization Function, hereinafter TSF) specified in the communication standard of IEEE802.11 described later as standard and has the above-mentioned timer function. Therefore, it is also possible to use such a wireless LAN chip as the irradiation side timing unit 125.

The second irradiation side timing unit 126 has the same timing operation itself as the irradiation side timing unit 125, and starts timing when the power is turned on or when a predetermined control signal is received from the outside. , Is configured to generate timekeeping information.
The output from the second irradiation side timing unit 126 may be used as timing information such as pulses at regular intervals, or counts up at regular intervals from time such as year, month, day, hour, minute, second, or from a certain point in time. It may be used as time information such as a count number.
Further, in recent years, there is also a wireless LAN chip that is equipped with a time synchronization function (Timing Synchronization Function, hereinafter TSF) specified in the communication standard of IEEE802.11 described later as standard and has the above-mentioned timer function. Therefore, it is also possible to use such a wireless LAN chip as the second irradiation side timing unit 126.

The display unit 127 is composed of a monitor such as an LCD (Liquid Crystal Display) or a CRT (Cathode Ray Tube), and according to the instruction of the display signal input from the radiation control unit 121, the input contents from the operation unit 15 and the radiation Irradiation result information (for example, tube voltage, tube current, irradiation time, tube current irradiation time product, number of images taken, incident dose, area dose, etc.) and radiation images based on image data are displayed.

The operation unit 15 includes a two-stage exposure switch 15a.
The exposure switch 15a is connected to the main body of the operation unit 15 by wire. The exposure switch 15a may be wirelessly connected to the operation unit 15.
Then, based on the operation of the exposure switch 15a, the imaging start signal is transmitted to the control device 12 and the imaging device 3. That is, in the present embodiment, pressing the exposure switch 15a is one of the exposure start operations.
As will be described later (as shown in FIG. 8), the operation unit 15 may be provided outside the control device 12 as the operation panel 15.

In this embodiment, the control device 12 includes the high voltage generation unit 122 as well. By doing so, the user can handle the radiation without being aware of the high voltage generating unit 122. Therefore, for example, it is possible to handle radiation with a device configuration that causes less unintended problems due to matching between devices.
On the other hand, the control device 12 does not include the high voltage generation unit 122, and the high voltage generation unit 122 can be configured independently of the main body of the control device 12. By doing so, the user can select an arbitrary high voltage generating unit 122 independent of the control device 12 to configure the device, and the degree of freedom in selecting the device can be increased.

[Configuration of radiography equipment]
Next, a specific configuration of the photographing apparatus 3 included in the photographing system 100 will be described. FIG. 3 is a block diagram showing a specific configuration of the photographing apparatus 3.
Here, a so-called indirect type that obtains an electric signal by converting the emitted radiation R into electromagnetic waves of other wavelengths such as visible light will be described as an example, but the present invention describes the radiation R as a detection element. It may be a so-called direct type imaging device that directly converts an electric signal into an electric signal.
Further, the other configurations of the photographing apparatus 3 are not limited to those illustrated in FIG. 3 as long as it is possible to generate image data of a radiographic image.

In addition to a housing and a scintillator (not shown), the photographing apparatus 3 according to the present embodiment includes an imaging control unit 31, a radiation detection unit 32, a scanning drive unit 33, a reading unit 34, and a storage unit 35, as shown in FIG. It includes a communication unit 36, a time measuring unit 37 on the photographing side, a timing unit 39 on the second photographing side, and the like. Each of the parts 31 to 39 is supplied with electric power from the battery 38.

The housing is provided with a power switch, a changeover switch, an indicator, a connector 36b of a communication unit 36, which will be described later, and the like, which are not shown.
When the scintillator receives radiation R, it emits an electromagnetic wave having a wavelength longer than that of radiation such as visible light.

The shooting control unit 31 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), a computer in which an input / output interface, etc. are connected to a bus, an FPGA (Field Programmable Gate Array), etc., which are not shown. It is composed of. It may be configured by a dedicated control circuit.

The radiation detection unit 32 is for generating electric charges by receiving radiation R, and includes a substrate 32a, a plurality of scanning lines 32b, a plurality of signal lines 32c, a plurality of radiation detection elements 32d, and a plurality of switch elements 32e. It is composed of a plurality of bias lines 32f, a power supply circuit 32g, and the like.
The substrate 32a is formed in a plate shape and is arranged so as to face the scintillator in parallel.
The plurality of scanning lines 32b are provided so as to extend in parallel with each other at predetermined intervals.
The plurality of signal lines 32c are provided so as to extend parallel to each other at predetermined intervals, extend orthogonally to the scanning lines 32b, and do not conduct with each scanning line.
That is, the plurality of scanning lines 32b and the signal lines 32c are provided so as to form a grid.

The radiation detection element 32d generates electric signals (current, electric charge) according to the dose of radiation (or the amount of electromagnetic light converted by the scintillator) radiated to the radiation detection element, and for example, a photodiode or the like. It is composed of a phototransistor and the like.
The plurality of radiation detection elements 32d are provided on the surface of the substrate 32a, respectively, in a plurality of regions partitioned by the plurality of scanning lines 32b and the signal lines 32c. That is, the plurality of radiation detection elements 32d are arranged in a matrix (matrix). Therefore, each radiation detection element 32d faces the scintillator.
A drain terminal of the switch element 32e, which is a switch element, is connected to one terminal of each radiation detection element 32d, and a bias wire is connected to the other terminal.

Similar to the radiation detection element 32d, the plurality of switch elements 32e are each provided in a plurality of regions partitioned by the plurality of scanning lines 32b and the signal lines 32c.
Each switch element 32e is connected to a scanning line 32b close to the gate electrode, a signal line 32c close to the source electrode, and a drain electrode connected to one terminal of the radiation detection element 32d in the same region.

The plurality of bias lines 32f are connected to the other terminal of each radiation detection element 32d.
The power supply circuit 32g generates a reverse bias voltage and applies the reverse bias voltage to each radiation detection element via the bias line 32f.

The scanning drive unit 33 includes a power supply circuit 33a, a gate driver 33b, and the like.
The power supply circuit 33a generates an on voltage and an off voltage having different voltages, respectively, and supplies them to the gate driver 33b.
The gate driver 33b switches the voltage applied to each scanning line 32b between an on voltage and an off voltage.

The reading unit 34 includes a plurality of reading circuits 34a, an analog multiplexer 34b, an A / D converter 34c, and the like.
The plurality of readout circuits 34a are connected to each signal line 32c of the radiation detection unit 32, and a reference voltage is applied to each signal line 32c.
Further, each read circuit 34a is composed of an integrator circuit 34d, a correlated double sampling circuit (hereinafter, CDS circuit) 34e, and the like.

The integrator circuit 34d integrates the electric charge emitted to the signal line 32c and outputs a voltage value corresponding to the integrated electric charge amount to the CDS circuit 34e.
The CDS circuit 34e samples and holds the output voltage of the integrating circuit 34d before applying the on voltage to the scanning line 32b to which the radiation detection element 32d to read the signal is connected (while applying the off voltage). , The signal charge of the radiation detection element is read by applying the on voltage to the corresponding scanning line 32b, and the difference in the output voltage of the integrating circuit 34d after applying the off voltage to the corresponding scanning line 32b is output. There is.

The analog multiplexer 34b is adapted to output a plurality of difference signals output from the CDS circuit 34e to the A / D converter 34c one by one.
The A / D converter 34c is adapted to sequentially convert the input analog voltage value image data into digital value image data.

The storage unit 35 is composed of a SRAM (Static RAM), a SDRAM (Synchronous DRAM), a NAND flash memory, an HDD (Hard Disk Drive), and the like.

The communication unit 36 is a communication means in the present invention, and includes an antenna 36a and a connector 36b for communicating with the outside.
Further, the communication unit 36 can select whether to perform wireless communication or wired communication based on a control signal from the outside. That is, when wireless communication is selected, wireless communication using the antenna 36a can be performed, and when wired communication is selected, information can be transmitted / received by using a wired LAN or the like. Further, when it is desired to perform synchronization using wired communication, synchronization can be performed by using, for example, a protocol such as NTP (Network Time Protocol) or a method as defined in the international standard IEEE1588.

The photographing side timing unit 37 is the third timing means in the present invention, and is configured to generate timing information by timing when the power is turned on or when a predetermined control signal is received from the outside. Has been done.
The output from the timekeeping unit 37 on the shooting side may be used as timing information such as pulses at regular intervals, or the time such as year, month, day, hour, minute, or second, or the number of counts counted up at regular intervals from a certain point in time. It may be used as time information such as.
The timekeeping unit 37 on the photographing side may be provided outside the photographing device 3 instead of being built in the photographing device 3.
Further, in recent years, there is also a wireless LAN chip that is equipped with a time synchronization function (Timing Synchronization Function, hereinafter TSF) specified in the communication standard of IEEE802.11 described later as standard and has the above-mentioned timer function. Therefore, it is also possible to use such a wireless LAN chip as the time measuring unit 37 on the photographing side.

The second photographing side timing unit 39 has the same timing operation itself as the photographing side timing unit 37, and starts timing when the power is turned on or when a predetermined control signal is received from the outside. , Is configured to generate timekeeping information.
The output from the second photographing side timing unit 39 may be used as timing information such as pulses at regular intervals, or the time such as year, month, day, hour, minute, or second, or count-up at regular intervals from a certain point in time. It may be used as time information such as a count number.
Further, in recent years, there is also a wireless LAN chip that is equipped with a time synchronization function (Timing Synchronization Function, hereinafter TSF) specified in the communication standard of IEEE802.11 described later as standard and has the above-mentioned timer function. Therefore, it is also possible to use such a wireless LAN chip as the second photographing side timing unit 39.

When the power is turned on, the photographing apparatus 3 configured in this way takes one of the "initialization state", "accumulation state", and "reading / transferring state". The timing for switching the state will be described later.
The "initialization state" is a state in which an on-voltage is applied to each switch element 32e and the electric charge generated by the radiation detection element 32d is not accumulated in each pixel (the electric charge is discharged to the signal line 32c).
The "accumulation state" is a state in which an off voltage is applied to each switch element 32e and the electric charge generated by the radiation detection element 32d can be accumulated in the pixel (the electric charge is not discharged to the signal line 32c).
In the "reading / transferring state", an on-voltage is applied to each switch element 32e, and the reading unit 34 is driven to read image data based on the inflowing electric charge and transmit it to another device. It is possible.
Depending on the configuration of the element and the device, the charge accumulated by reading is cleared, so "reading" and "initialization" are not distinguished as separate operations, and "reading" and "initialization" are regarded as the same operation. It may be done at the same time.

[Timekeeping shift]
Although the details will be described later, in the photographing system 100 according to the present embodiment, the imaging device 3 owns the second imaging side timing unit based on the timing information of the second irradiation side timing unit 126 provided by the control device 12. Based on 39, each person's operation timing is determined. Therefore, if the time measuring speed of the second irradiation side time measuring unit 126 and the time measuring speed of the second photographing side measuring unit 39 are the same, the irradiation device 1 and the photographing device 3 are synchronized.
However, for example, due to the influence of the frequency error of the oscillator included in the control device 12 and the photographing device 3, the time measuring speed of the second irradiation side time measuring unit 126 linked with the control device 12 and the second photographing linked with the photographing device 3 There may be a slight difference from the time measuring speed of the side measuring unit 39. In such a case, when shooting for a relatively long time such as serial shooting is performed, the difference between the timing information of the second irradiation side timing unit 126 and the timing information of the second imaging side timing unit 39 gradually increases. Therefore, the operation timing of the irradiation device 1 and the operation timing of the photographing device 3 are different from each other.

Therefore, the imaging system 100 of the present embodiment periodically performs the timing information of the second irradiation side timing unit 126 and the timing information of the second imaging side timing unit 39 based on the reference timing information (hereinafter referred to as the first timing information). It is possible to align them in a targeted manner.
Examples of the method for generating the first timekeeping information include the following.

[Method 1 for generating first timekeeping information]
The first generation method is a method of using the time information used in the time synchronization function (TSF) of the 802.11 communication standard as the first timekeeping information.

The "TSF" is a function of adjusting the time between the access point and the device when performing wireless communication between the devices.
Specifically, the access point is provided with a time measuring means (TSF timer) that counts up periodically (every 1 μs) in a free run, and the beacon transmitted periodically (every 100 ms by default) is used at the time of transmission. Send to the terminal including the time information.
On the other hand, the terminal is also provided with a time measuring means that counts up periodically (every 1 μs), and when the beacon is received, the time information of its own time measuring units 125 and 37 is updated to the time information included in the beacon, and the counting up is continued. It is to do.

When this TSF time information is used as the first time information, for example, as shown in FIG. 4, a TSF timer 22 is provided in the AP2, and the time information is included in the beacon output by the communication unit 21 of the AP2 to be a control device. Output to 12 and the photographing device 3.
As a timekeeping method, for example, counting is started from 0, and when the time information reaches a predetermined maximum value, it is reset to 0 and the counting is repeated.
The TSF timer 22 may be configured to output timekeeping information based on timekeeping independent of the control device 12 and the photographing device 3, or may output timekeeping information linked to the timekeeping information of the control device 12 or the photographing device 3. It may be configured to be used.
The TSF timer 22 included in this beacon, that is, the TSF timer 22 is the first timekeeping means in the present invention, and the time information of the TSF timer 22 at the time of beacon transmission becomes the first timekeeping information.
Hereinafter, AP2 when TSF is used as the first timekeeping information is referred to as a timekeeping information source device 2.

[Method of generating first timekeeping information 2]
The second generation method is a method using a dedicated device that outputs the first timekeeping information.

Specifically, for example, as shown in FIG. 5, a timekeeping means (not shown) is provided, and a timekeeping information source device 4 capable of communicating the timekeeping information with the control device 12 and the photographing device 3 is provided.
The timekeeping information source device 4 shall have a built-in timekeeping means (not shown).
The timekeeping means of the timekeeping information source device 4 may be configured to output the timekeeping information based on the timekeeping independent of the control device 12 and the photographing device 3, or may be linked to the timekeeping information of the control device 12 or the photographing device 3. It may be configured to output the timekeeping information.
The output from the timekeeping information source device 4 may be used as timing information such as pulses at regular intervals, or the time such as year, month, day, hour, minute, or second, or the number of counts counted up at regular intervals from a certain point in time. It may be used as time information such as.
Then, the timed information is periodically transmitted as the first timed information.
Hereinafter, the TSF timer 22 of the AP2 and the timekeeping means (not shown) of the timekeeping information source device 4 may be collectively referred to as a reference timekeeping unit.

[Correction of deviation]
Of the radiation control unit 121 of the control device 12 of the present embodiment and the imaging control unit 31 of the imaging device 3, the control unit (hereinafter, control units 121 and 31) of the device that receives the first timekeeping means is a timekeeping information source device. Each time the first timekeeping information is received from 2 and 4, the timekeeping unit of the device that receives the first timekeeping information among the irradiation side timekeeping unit 125 of the control device 12 and the imaging side timekeeping unit 37 of the imaging device 3 (hereinafter referred to as the timekeeping unit). The timekeeping information of 37,125) is updated to the value of the first timekeeping information.

Further, the timing units 126 and 39 of the present embodiment can set their own operation mode to the synchronous mode, and may switch to the self-propelled mode in some cases.
The switching of these operation modes will be described later.

Further, the control units 121 and 31 are timed units of the device that receives the first timekeeping information of the second irradiation side timekeeping unit 126 of the control device 12 and the second photographing side timekeeping unit 39 of the photographing device 3 at predetermined timings. (Hereinafter, the timekeeping information of the second timekeeping unit 126, 39) is updated to the timekeeping information of the timekeeping units 125, 37, and then the counting is continued. As described above, the timekeeping units 125 and 37 synchronize the time with the timekeeping information source devices 2 and 4 each time the first timekeeping information is received from the timekeeping information source devices 2 and 4. Therefore, the second timekeeping units 126 and 39 also repeatedly synchronize with the timekeeping information source devices 2 and 4 at predetermined cycles while operating in the synchronization mode.
Further, the control units 121 and 31 update the timekeeping information of the second timekeeping units 126 and 39 to the timekeeping information of the timekeeping units 125 and 37 when the second timekeeping units 126 and 39 operate in the self-propelled mode. Keep counting without fail.

〔Mode switching〕
Next, the details of the operation mode switching of the second irradiation side timing unit 126 and the second imaging side timing unit 39 performed by the radiation control unit 121 and the imaging control unit 31 will be described.

For example, an abnormality occurs in the timekeeping information source devices 2 and 4, and the first timekeeping information of the timekeeping information source devices 2 and 4 is reset in the middle, and the timekeeping on the shooting side synchronizes with the timekeeping information source devices 2 and 4. The second imaging side timekeeping part 39 and the second irradiation which corrects one's own timekeeping information based on the timekeeping information of the part 37 and the irradiation side timekeeping part 125 (hereinafter referred to as the timekeeping part 37, 125) and these timekeeping parts 37, 125. The timekeeping information of the side timekeeping unit 126 (hereinafter referred to as the second timekeeping unit 39, 126) may also be updated on the way. In such a case, if serial imaging is performed in which radiation irradiation and charge accumulation are repeated a plurality of times, the timing will be shifted only for the imaging immediately after the timekeeping information is updated.
Therefore, the control units 121 and 31 of the present embodiment may use the second irradiation side timing unit 126 or the second imaging side timing unit as necessary so as not to disturb the imaging cycle of serial imaging in the middle even in such a case. The operation modes of 39 are switched.

The control units 121 and 31 are designed to determine whether or not a predetermined condition is satisfied.
In the present embodiment, the condition that a predetermined condition is satisfied is to detect an abnormality that may adversely affect the shooting timing. Specifically, for example, a predetermined event is detected during the shooting period, or shooting is performed. During the period, the time from the previous synchronization to the current synchronization (first timekeeping information reception interval) exceeded a predetermined threshold, and during the shooting period, the second timekeeping unit 39 and the second irradiation side timekeeping. The change amount of the timekeeping information at the time of synchronization of the part 126 exceeded a predetermined threshold, the timekeeping information suddenly changed due to the restart of the timekeeping information source devices 2 and 4 during the shooting period, and the shooting. It is determined that the predetermined condition is satisfied based on the fact that the reception of the first timekeeping information has failed for a long period of time during the period.
That is, the control units 121 and 31 form the determination means in the present invention.

In addition, the predetermined conditions can be satisfied by the establishment of the events listed in (1) to (3) below. These may be used alone or in combination.
(1) The number of times the first timekeeping information was received during the shooting period was counted, and the number of times fell below a predetermined threshold value.
(2) During the shooting period, the reception interval of the first timekeeping information was repeatedly measured, and at least one of the reception intervals of the first timekeeping information exceeded a predetermined threshold value.
(3) During the imaging period, the amount of change in the timekeeping information of the second imaging side timing unit 39 and the second irradiation side timing unit 126 when synchronized is repeatedly measured, and at least one of the changes is a predetermined threshold value. Beyond.
In particular, if (2) and (3) are used, synchronization failure can be detected immediately.

Further, the control units 121 and 31 are adapted to switch the operation mode of the second irradiation side timing unit 126 and the second photographing side timing unit 39 to the self-propelled mode when it is determined that the predetermined condition is satisfied.
The control units 121 and 31 set the operation mode to the synchronous mode from the time the power is turned on until it is determined that the predetermined condition is satisfied (default state).
Further, the control units 121 and 31 are adapted to switch (return) to the synchronous mode when the predetermined condition is no longer satisfied when the shooting is performed in the self-propelled mode.
That is, the control units 121 and 31 form the switching means in the present invention.

In addition, instead of switching to the self-propelled mode only when the predetermined condition is satisfied, the self-propelled mode may be switched over the entire period in which the predetermined condition may be satisfied.
Examples of such a period include a period from the start to the end of imaging, as shown in FIG.

Examples of the shooting start trigger for determining the start of shooting include the following operations (open-1) to (open-8). It is also possible to combine a plurality of these.
(Open-1) Accepting a user's instruction through a user interface (hereinafter referred to as UI) such as console 14, shooting device 3, control device 12, operation unit 15, or exposure switch 15a (Open-2) Shooting with console 14. The order has been selected (Open-3) The imaging device 3 is ready to be irradiated with radiation (Open-4) The first stage of the exposure switch 15a has been pressed (Open-5) Control device 12 received a signal from the tube 13 that the irradiation preparation was completed, or the control unit 121 received a signal from the high voltage generating unit 122 that the irradiation preparation was completed (Open-6). The second stage of the switch 15a is pressed (open-7). The control device 12 has received a signal from the tube 13 that the irradiation for the first frame photography has started, or the control unit 121 has received a signal. A signal indicating that irradiation for the first frame shooting has been started is received from the high voltage generation unit 122 (Open-8) A predetermined time from the generation of the shooting start triggers (Open-1) to (Open-7) above. Has passed

Further, as the shooting end trigger for determining the end of shooting, the following operations (end-1) to (end-9) can be mentioned. It is also possible to combine a plurality of these.
(Final-1) The user's instruction was received by the UI of the console 14, the photographing device 3, the control device 12, the operation unit 15, the exposure switch 15a, etc. (Final-2) The control device 12 received the user's instruction from the tube 13 to the final frame. The signal that the irradiation for photographing the final frame has been completed has been received, or the control unit 121 has received the signal that the irradiation for photographing the final frame has been completed from the high voltage generation unit 122 (. Final-3) The processing of the final frame is completed by the photographing device 3 or the control device 12 (End-4) The reading of the final frame is completed by the photographing device 3 (End-5) The second stage of the exposure switch 15a is released. (Final-6) The first stage of the exposure switch 15a was released (Final-7) An error occurred that could not continue shooting (Final-8) The next shooting order was selected on the console 14. (End-9) A predetermined time has passed since the shooting end trigger of (End-1) to (End-8) above occurred.

When performing serial shooting or still image shooting with a short shooting time, the frequency error between the oscillators of the shooting device 3 and the control device 12 even if the self-propelled mode is switched to before the predetermined conditions are satisfied during the shooting period. The deviation of the exposure / accumulation timing due to the above may be within the required accuracy. Therefore, by doing so, it is possible to simplify the processing by the control units 121 and 31 in the shooting system 100 that performs only serial shooting and still image shooting with a short shooting time, and the development of the shooting system 100 can be performed at low cost. It can be done in a short period of time.

However, the shorter the period of operation in the self-propelled mode, the less likely it is that the operation of the photographing device 3 and the control device 12 will be misaligned. Therefore, it is preferable to switch to the self-propelled mode at a timing closer to the start of radiation irradiation. For example, when the shooting start trigger for determining that the first step of the exposure switch mentioned in (Open-4) is pressed is used as the shooting start trigger, the period from the pressing of the first step to the pressing of the second step. If is longer, the period of operation in the self-propelled mode becomes longer, so it is preferable to use (open-5) to (open-7) as a trigger rather than the above (open-4).

However, depending on the specifications and system configuration of the tube 13 and the high voltage generating unit 122, it may be necessary to modify the device and wiring in order to use the preferable shooting start trigger. Therefore, it is desirable to determine the shooting start trigger to be adopted according to the device and system configuration from the viewpoint of suppressing the development cost.
If the period for operating in the self-propelled mode becomes long due to the limited number of shooting start triggers to be adopted, the timing for switching to the self-propelled mode can be set by using the above (open-8) as the shooting start trigger. Can be brought closer to the start of radiation. )

Further, as described in (Open-1) and (End-1) above, if the operation mode can be switched at the user's will, the radio wave condition deteriorates due to the arrangement of the photographing device 3 and the devices used at the same time. If the user is aware that the synchronization accuracy with the reference time may decrease due to radio wave interference with, etc., the operation mode should be manually switched on the spot to avoid the decrease in synchronization accuracy. Can be done.
At that time, if the current operation mode can be displayed on the display unit 127, the console 14, the operation unit 15, the display unit (not shown) of the photographing device 3, the usability of the system 100 is improved, and the user is unnecessary. It is possible to prevent the switching operation from being performed.

:
Further, the imaging system 100 is provided with a plurality of timing information source devices 2 and 4, and by moving the imaging device 3 and the control device 12, the timing information source devices 2 and 4 (n) currently connected can be used for other timing. When the radio wave condition with the information source devices 2 and 4 (n + 1) is improved, the connection destination is switched to the timekeeping information source devices 2 and 4 (n + 1) (the roaming operation of the wireless LAN is performed), and during the shooting period. If the connection destination is switched, the reference time will change, the exposure and reading timing will not be consistent, and shooting will fail. In order to avoid this, even if the timekeeping information source devices 2 and 4 connected during the shooting period change, it is preferable to switch to the self-propelled mode and return to the synchronous mode after the shooting is completed.

Although the photographing system 100 having the operation mode switching function in both the control device 12 and the photographing device 3 has been described above as an example, these functions are provided in at least one of the control device 12 and the photographing device 3. You just have to.

[Flow of serial shooting]
Next, the flow of serial shooting using the shooting system 100 of the present embodiment capable of switching the operation mode as described above will be described. FIG. 7 is a timing chart showing the operation of the photographing system 100 of the present embodiment.
Here, the case where the shooting conditions are set to the connection form of the shooting device 3: wireless, the shooting mode: serial shooting, and the frame rate: 15 fps will be described as an example, but the flow is the same for other shooting conditions. be.

When the user selects a shooting condition on the console 14, the console 14 transmits the shooting condition to the shooting device 3 via the wired communication network, the timing information source devices 2 and 4, and the radio, and the shooting condition is sent to the control device 12. Conditions and irradiation conditions of radiation (tube current, tube voltage, irradiation time) ”is transmitted. The irradiation time here is the irradiation time per pulse in pulse irradiation.
When the imaging device 3 and the control device 12 receive the imaging conditions and irradiation conditions, they store the imaging conditions and irradiation conditions in their respective storage units 35 and 123, and start processing for performing wireless serial imaging.

(Procedure 1)
Then, the control device 12 sets the received irradiation condition to the high voltage generation unit 122 via the control unit 121. The system may be configured so that the user can input the irradiation conditions from the operation unit 15, and in that configuration, the control device 12 inputs the irradiation conditions input from the operation unit 15 to the high voltage generation unit 122 via the control unit 121. Set to. When the control device 12 receives a new irradiation condition from the console 14 in the stage before the first stage of the exposure switch 15a is pressed or in the stage before the second stage is pressed, the control device 12 is a control unit. Irradiation conditions are set in the high voltage generation unit 122 via 121. The same applies to a system configuration in which the user can input irradiation conditions from the operation unit 15. Normally, the irradiation conditions are finely adjusted according to the physique of the patient, but by doing so, the degree of freedom in the operation order is increased and the usability is improved.

(Procedure 2)
Then, the imaging control unit 31 and the radiation control unit 121 set the operation modes of the second timing units 39 and 126 to the synchronous mode, respectively.

(Procedure 3)
Further, the timekeeping information source devices 2 and 4 periodically transmit the first timekeeping information to the photographing device 3 and the control device 12 (standardly every 100 ms). At that time, the timekeeping information source devices 2 and 4 transmit the first timekeeping information at that time to the photographing device 3 and the control device 12.
At this time, if wireless communication is established between the timekeeping information source devices 2 and 4 and the photographing device 3 and the control device 12, the photographing device 3 and the control device 12 are transmitted from the timing information source devices 2 and 4. It receives the first timekeeping information, updates its own timekeeping units 37 and 125, and continues counting.

(Procedure 4)
Further, whether or not the photographing device 3 and the control device 12 satisfy the predetermined conditions, that is, whether or not their own timekeeping units 37 and 125 can be synchronized with the timekeeping information source devices 2 and 4 with the required accuracy. Is continuously determined. In this way, it is determined in advance whether or not synchronization is possible because if the synchronization accuracy is lowered during the imaging period, the irradiation timing of radiation and the timing of reading image data will be different, which will cause imaging failure. ..

(Procedure 5)
Further, the photographing device 3 and the control device 12 share the determination results by transmitting each other periodically. By doing so, the first timekeeping information cannot be received from the timekeeping information source devices 2 and 4 for a long period of time, or the first timekeeping information of the timekeeping information source devices 2 and 4 can be obtained by restarting the timekeeping information source devices 2 and 4. When there is a big change, it can be detected immediately.

(Procedure 6)
When the control unit 121 of the control device 12 detects the pressing of the second stage of the exposure switch 15a (receives the shooting start signal), the control unit 121 transmits a signal to that effect to the high voltage generation unit 122 to generate a high voltage. The transition to the standby state waits for the completion notification signal to the effect that the irradiation preparation is completed to be returned from the unit 122.
Upon receiving the imaging start signal, the high voltage generation unit 122 starts irradiation preparation. Specifically, the voltage and current to be output to the tube 13 are prepared, and the rotation anode is instructed to start rotating to the tube 13.
When the rotating anode reaches a predetermined rotation speed, the tube 13 transmits a preparation completion notification signal to the high voltage generation unit 122. When the irradiation preparation is completed, the high voltage generation unit 122 transmits a completion notification signal indicating that the irradiation preparation is completed to the control unit 121.
Upon receiving the irradiation preparation completion notification signal, the control unit 121 transmits a command for notifying the imaging device 3 that the irradiation preparation for radiation is completed via the communication unit 124.

(Procedure 7)
Upon receiving the command, the photographing device 3 transitions to a state in which photography is possible.
After that, the photographing device 3 and the control device 12 wait for the second timekeeping units 39 and 126 to update the respective timekeeping information to the timekeeping information of the timekeeping units 37 and 125.
Here, if the update of the timekeeping information is not completed within a predetermined time, the console 14 or the like is notified that the synchronization has failed, and the display unit or the like (not shown) of the console 14 indicates that the synchronization has failed. Alternatively, a display prompting for troubleshooting such as restarting the timekeeping information source devices 2 and 4 and checking the network settings, or a display prompting for shooting by wire may be displayed. This makes it possible to recover from an abnormality at an early stage.

When the update of the timekeeping information of both the second timekeeping units 39 and 126 is completed, the photographing device 3 adds the photographing sequence start waiting time stored in the storage unit 35 to the timed information of the second time counting unit 39 at the time of completion. The shooting sequence start time is calculated, stored in the storage unit 35, and transmitted to the control device 12.
The shooting sequence start waiting time is determined in advance based on the expected communication delay time, and if it is set to be longer than the expected maximum delay time, the transmission of the shooting sequence start time is delayed. In addition, it is possible to avoid a situation in which the shooting sequence start time has already passed when the control device 12 receives the shooting sequence start time, and the shooting fails.
In the above, the imaging device 3 is configured to transmit the imaging sequence start time to the control device 12, but the control device 12 is stored in the storage unit 123 in the timing information of the second timing unit 126 when both updates are completed. The imaging sequence start time may be calculated by adding the imaging sequence start waiting time, stored in the storage unit 126, and transmitted to the imaging device 3.

(Procedure 8)
The photographing device 3 and the control device 12 continuously determine whether or not synchronization is achieved even after the synchronization with each other is completed.
Further, the photographing device 3 and the control device 12 are the last of serial imaging from the time when the synchronization of the photographing device 3 and the control device 12 is completed after the irradiation preparation completion notification signal is transmitted from the high voltage generation unit 122 to the control unit 121. When it is detected that synchronization has failed in the period until the start of reading the frame, the second timing units 39 and 126 are operated in the self-propelled mode for at least the period from that point to the start of reading the last frame of the serial shooting. After that, it returns to the synchronous mode. If it is detected that synchronization has failed, the second timekeeping unit 39 can be switched to the self-propelled mode before updating the timekeeping information of the second timekeeping units 39 and 126 to the timekeeping information of the timekeeping units 37 and 125. , 126 can be prevented from being set to an abnormal value.

(Procedure 9)
Further, when the control device 12 receives the shooting sequence start time from the shooting device 3, the control device 12 stores it in the storage unit 123. Then, the exposure start time of each frame is generated based on the stored shooting sequence start time and frame rate (15 fps or the like).
As a specific method for generating the exposure start time, for example, the shooting sequence start time is set as the exposure start time of the first frame, and the shooting cycle (= 1 / frame rate) is cumulatively added to the second and subsequent frames. In this case, the exposure start time of the Nth frame = the shooting sequence start time + (frame number N-1) × the shooting cycle.
It should be noted that the exposure start time may be generated in advance and stored in the storage unit 123 so that it can be referred to each time the exposure start instruction of each frame is received later, or the exposure start of the previous frame may be started. The imaging cycle may be added to the time, and the image may be generated each time an exposure start instruction for each frame is received. If the latter is used, the capacity of the storage unit 123 can be reduced, and it becomes easy to deal with the case where the number of frames per shooting fluctuates.

(Procedure 10)
Further, the control unit 121 transmits a signal instructing the high voltage generation unit 122 to start the exposure of each frame each time the time measurement information of the second irradiation side time measurement unit 126 matches the exposure start time of each frame. ..
The high voltage generation unit 122 controls to irradiate the tube 13 with radiation R for a preset irradiation time each time a signal for instructing the start of exposure is received. That is, the control device 12 irradiates the radiation R from the tube 13 when the timekeeping information of the second irradiation side timekeeping unit 126 reaches the first predetermined value.

(Procedure 11)
Further, the control unit 121 notifies, for example, that the second stage of the exposure switch 15a is released, the number of shooting frames reaches the maximum number of frames stored in the storage unit 123, and the high voltage generation unit 122 stops. When a shooting end event such as receiving or receiving a stop notification from the shooting device 3 is detected, a command notifying the end of shooting is transmitted to the shooting device 3 via the communication unit 124, and new exposure is emitted in the shooting. Do not send the start instruction to the high voltage generator 122. That is, the shooting is finished.
As for the maximum number of frames, a fixed value may be stored in the storage unit 123, or the value input by the console 14 may be transmitted to the control device 12 and stored in the storage unit 123.

(Procedure 12)
Further, the photographing device 3 generates a reading start time of each frame based on the photographing sequence start time, the frame rate, and the accumulation time per frame stored in the storage unit 123.
The accumulation time is set to be longer than the irradiation time per frame in order to avoid being exposed during reading.
As a specific method for generating the reading start time, for example, the shooting sequence start time + the accumulation time per frame is set as the reading start time of the first frame, and the shooting cycle (= 1 / frame rate) is set for the second and subsequent frames. Cumulative addition. In this case, the exposure start time of the Nth frame = the shooting sequence start time + the accumulation time per frame + (frame number N-1) × the shooting cycle.
A plurality of read start times may be generated in advance and stored in the storage unit 123 so that they can be referred to each time the read process of each frame is performed later, or the shooting cycle is set to the read start time of the previous frame. May be added and generated each time the reading process of each frame is performed. If the latter is used, the capacity of the storage unit 123 can be reduced, and it becomes easy to deal with the case where the number of frames per shooting fluctuates.

In this way, the imaging device 3 and the imaging device 3 can generate the reading start time independently from the imaging sequence start time and the frame rate, and the control device 12 also independently generates the exposure start time. The minimum information to be shared with the control device 12 is only the shooting sequence start time and the frame rate, and the original reading is started due to the communication delay due to the packet loss between the shooting device 3 and the control device 12. It is possible to reduce the risk of shooting failure due to the reading start time arriving after the timing at which the exposure should start or the exposure start time arriving after the timing at which the exposure should originally start.

(Procedure 13)
Further, the photographing device 3 starts reading the electric charge accumulated in the radiation detection unit 32 every time the second photographing side timing unit 39 matches the reading start time of each frame, and generates image data of the frame image. .. That is, the photographing device 3 reads out the image data of the radiation image based on the electric charge generated in the radiation detection unit 32 when the time measuring information of the second photographing side timing unit 39 becomes the second predetermined value.

(Procedure 14)
Then, when the photographing device 3 detects, for example, a shooting end event such as receiving a command notifying the end of shooting from the control device 12, the number of shooting frames has reached the maximum number of frames stored in the storage unit 35, the shooting end event is concerned. Finish shooting.
If a shooting end event is detected during reading, it is preferable to end the shooting after the reading is completed. By doing so, it is possible to avoid an abnormality such that the frame image of the final frame is only a part.

Up to this point, the imaging system 100 according to the present embodiment has been described, but the connection configuration of the timekeeping information source devices 2 and 4, the radiation control device 12, the console 14, the operation unit 15, and the exposure switch 15a is shown in FIG. It is possible to take various configurations, not limited to the configuration of.
For example, the operation unit 15 may be connected only to the console 14, and the device may be configured such that a signal for an operation to the operation unit 15 enters the control device 12 via the console 14.
Further, for example, the time measuring information source devices 2 and 4 do not necessarily have to be connected to both the control device 12 and the console 14, but are connected only to the console 14 to perform information and time adjustment between the console 14 and the control device. The 12 can also be configured to control information and time via the console 14.
Further, for example, the exposure switch 15a may be configured to be directly connected to the control device 12 instead of the operation unit 15.
As described above, similarly in the following figure, a device connection configuration that does not impair the object, action, and effect described in the present invention can be used in addition to the above description.

<Auxiliary technology>
Next, embodiments of other radiography systems to which the present invention can be applied will be described.
Here, the same reference numerals are given to the configurations common to the above embodiments, and the description thereof will be omitted.

[Configuration of radiography system]
First, the outline of the radiography imaging system (hereinafter, imaging system 100A) of the present embodiment will be described. FIG. 8 is a block diagram showing a schematic configuration of the photographing system 100A.

As shown in FIG. 8, the imaging system 100A of the present embodiment includes a tube 13, a console 14, a timekeeping information source device 2 and 4, and a radiation control device (hereinafter referred to as a control device 12A) similar to those of the above embodiment. , A radiographic imaging device (hereinafter referred to as an imaging device 3A), and an operation panel 15 are provided.
The control device 12A and the photographing device 3A can communicate with each other via the timekeeping information source devices 2 and 4.
Details of the control device 12A and the photographing device 3A will be described later.

The operation panel 15 is configured in the same manner as the operation unit 15 of the above embodiment.
Therefore, as in the above embodiment (as shown in FIG. 1), the operation panel 15 may be provided in the control device 12A as the operation unit 15.

[Structure of radiation control device]
Next, a specific configuration of the control device 12A included in the photographing system 100A will be described. FIG. 9 is a block diagram showing a specific configuration of the control device 12A.

As shown in FIG. 9, the control device 12A of the present embodiment has the same radiation control unit 121, storage unit 123, communication unit 124, irradiation side timekeeping unit 125, high voltage generation unit 122, etc. as in the above embodiment. It is configured with.
However, the control device 12A of the present embodiment does not have a configuration corresponding to the second irradiation side timing unit 126 of the above embodiment.

The high voltage generation unit 122 is configured to apply a voltage corresponding to preset irradiation conditions of radiation to the tube 13 based on the reception of the control signal from the tube control unit.

[Configuration of radiography equipment]
Next, a specific configuration of the photographing device 3A included in the photographing system 100A will be described. FIG. 10 is a block diagram showing a specific configuration of the photographing apparatus 3B.

The photographing device 3A has a configuration similar to that of the photographing device 3 of the above-described embodiment. That is, as shown in FIG. 10, the photographing control unit 31A, the radiation detection unit 32 similar to the above embodiment, the scanning drive unit 33, the reading unit 34, the storage unit 35, the communication unit 36, the battery 38, and the timekeeping unit on the photographing side. It is equipped with 37A.
However, the imaging device 3A of the present embodiment does not have a configuration corresponding to the second imaging side timing unit 39 of the above embodiment.

[Radiation imaging system imaging operation]
Next, the basic shooting operation performed by the shooting system 100A will be described. FIG. 11 is a timing chart showing the operation of the photographing system 100A, and FIG. 12 is a diagram showing the timing information of each timing unit when the photographing system 100A operates.

First, when the irradiation-side timing unit 125 of the control device 12A and the imaging-side timing unit 37 of the imaging device 3A perform an operation that triggers the start of timing (for example, the power of each device of the imaging system 100A is turned on). The irradiation side time measuring unit 125 and the photographing side time measuring unit 37 start time counting, respectively.
At this time, the timekeeping start timing of the irradiation side timekeeping unit 125 and the timekeeping start timing of the photographing side timekeeping unit 37 are different, depending on the timekeeping information of one of the timekeeping units or the timekeeping information of the timekeeping means linked with one of the timekeeping units. The timekeeping information of the other timekeeping unit is adjusted to the timekeeping information of one timekeeping unit.
After that, when the exposure switch 15a of the irradiation device 1 is pressed by the user, the irradiation device 1 transmits an imaging start signal to the control device 12A and the imaging device 3A.
Then, in the photographing device 3A, the time measuring information (time information) of the photographing side measuring unit 37 becomes the first predetermined value (t1), or (when the first predetermined time (t1) elapses from the start of timing), the photographing device 3A is used. 3A performs initialization to discharge the dark charge accumulated in each pixel to the signal line 32c by applying an on voltage to each switch element 32e.

After that, when the timing information of the imaging side timing unit 37 becomes a second predetermined value (t2) larger than the first predetermined value (when the second predetermined time (t2) elapses from the start of timing), the imaging device 3A performs each scanning line. By applying an off voltage to the 32b, the electric charge generated by the radiation detection element 32d can be stored in the pixel. This state in which the electric charge can be accumulated is continued until the timekeeping information of the photographing side timekeeping unit 37 reaches the fourth predetermined value (t4) larger than the second predetermined value (until the fourth predetermined time elapses from the start of timekeeping). ..

Further, in the irradiation device 1, when the timing information of the irradiation side timing unit 125 of the control device 12A becomes a third predetermined value (t3) larger than the second predetermined value and smaller than the fourth predetermined value (third predetermined time from the start of timing). After that, the radiation R is applied to the subject S and the photographing apparatus 3A behind it. That is, the irradiation device 1 irradiates radiation while the photographing device 3A is in a state where electric charges can be accumulated (t2 to t3).
Then, when the photographing apparatus 3A receives the radiation R, each radiation detection element 32d of the radiation detection unit 32 generates an electric charge and stores it in each pixel.

Further, when the time measuring information of the time measuring unit 37 on the photographing side becomes the fourth predetermined value (t4) larger than the third predetermined value (when the fourth predetermined time (t4) elapses from the start of the time measurement), the photographing apparatus 3A first starts. In the same flow as the initialization, an on-voltage is applied to each TFT 35 connected to each scanning line 32b, and the electric charge accumulated in each pixel is discharged to each signal line 32c. Then, the reading unit 34 reads out the image data based on the electric charge that has flowed in.
Depending on the configuration of the radiation detection element of the photographing apparatus 3A, the accumulated charge may be released and the initialization operation may be performed when the charge is read out.

When the shooting mode is set to the serial shooting mode, the irradiation device 1 and the shooting device 3A take the number of frame images for shooting the above-mentioned series of operations based on the timekeeping information of the TSF timer 22 and the timekeeping unit 37 on the shooting side. Repeat for minutes.

[Timekeeping shift]
While the photographing system 100A is operating as described above, for example, due to the influence of the frequency error of the oscillator included in the control device 12A and the photographing device 3A, the timekeeping of the irradiation side timekeeping unit linked with the control device 12A. There may be a slight difference between the speed and the time measuring speed of the time measuring unit 37 on the photographing side linked with the photographing apparatus 3A. In such a case, when shooting for a relatively long time such as serial shooting is performed, for example, as shown in FIG. 12, there is a discrepancy between the timing information of the irradiation side timing unit 125 and the timing information of the imaging side timing unit 37. Since the size gradually increases, the operation timing of the irradiation device 1 and the operation timing of the photographing device 3A deviate from each other.
Therefore, the imaging system 100A of the present embodiment takes appropriate measures before the deviation between the operation timing of the irradiation device 1 and the operation timing of the imaging device 3A becomes large enough to affect the diagnosis. There is.

In order to confirm the degree of deviation, the first timekeeping information as a reference for comparison and the second timekeeping information to be compared are required.
As the method of generating the first timekeeping information, as in the above embodiment, a method of using the time information used in TSF possessed by the communication standard of IEEE802.11 as the first timekeeping information may be used, or the timekeeping different from AP2 may be used. A method may be used in which the time information or the timing information from the information source device 4 is used as the first timekeeping information.

[Acquisition of second timekeeping information]
Of the control device 12A and the photographing device 3A, the control unit of the device that receives the first timekeeping information from the timekeeping information source devices 2 and 4 receives (acquires) the first timekeeping information from the timekeeping information source devices 2 and 4. ), The timekeeping information of the irradiation side timekeeping unit 125 or the photographing side timekeeping unit 37 is acquired as the second timekeeping information.
In particular, in the present embodiment, a plurality of first timekeeping information and a plurality of second timekeeping information are acquired at a plurality of predetermined time points in at least a part of the photographing period.
The specific period may be set to a desired length based on the user's operation.

FIG. 13 shows a configuration in which the timekeeping information by the own timekeeping unit 37 in the photographing apparatus 3 is corrected and the timekeeping information is output to the photographing control unit 31, and FIG. 14 shows the timing by the own timing unit 125 in the control device 12A. The configuration which corrects the information and outputs the timekeeping information to the radiation control unit 125 is shown respectively.

Of the photographing device 3A and the control device 12A, the device for acquiring the first timekeeping information includes the timekeeping control means 3a and 12a. The timekeeping control means 3a and 12a are connected to their own timekeeping units 125 and 37, and acquire second timekeeping information (time information or timing information) from their own timekeeping units 125 and 37.
Further, the timekeeping control means 3a and 12a are connected to their own communication units 124 and 36, and can acquire the first timekeeping information (time information or timing information) from the timekeeping information source devices 2 and 4. ..
Such timekeeping control means 3a and 12a may be configured to be performed by individual semiconductors, substrates or devices, or may be one of the functions of general-purpose processing units (including radiation control unit 121 and imaging control unit 31) such as CPU and FPGA. It may be incorporated as a part.

Further, the timekeeping control means 3a and 12a can be set in advance with timing information of the timekeeping information source devices 2 and 4 or setting information related to time information transmission.
When the first timekeeping information output by the timekeeping information source devices 2 and 4 is timing information, for example, when the interval at which timing information (pulses, etc.) is output from the timekeeping information source devices 2 and 4 is set every x seconds. It is possible to set the interval at which the first timekeeping information can be acquired from the outside as x seconds.
On the other hand, when the first timekeeping information output by the timekeeping information source devices 2 and 4 is time information, for example, the time information (time and the timekeeping information source device 4 counts up from a certain point in time) from the timekeeping information source devices 2 and 4. When the interval at which the count number etc. is output is set every x seconds, it is possible to set the interval at which the timekeeping information can be acquired from the outside as x seconds.
In particular, when the time information is a count-up value in the timekeeping information source device 4, the timekeeping control means 3a and 12a can acquire and set the count interval of the timekeeping information source device 4. For example, when the count frequencies of the timekeeping information source devices 2 and 4 are yHz, it is possible to acquire and set that the count interval is 1 / y seconds.

[Combination of deviation confirmation methods]
In the present embodiment, as described above, the first timekeeping means generated by the timekeeping information source devices 2 and 4 may be time information or timing information, and may be the irradiation side timekeeping unit 125 or the photographing side control unit. The second timekeeping information acquired by 37 may also be time information or timing information.
Therefore, the comparison for confirming the deviation between the first timekeeping information and the second timekeeping information is performed by one of the following four methods depending on the configuration of each device.
1. 1. Comparison of timing information and timing information 2. Comparison of timing information and time information 3. Comparison of time information and timing information 4. Comparison of time information and time information The following describes in detail how to check the amount of deviation of the first and second timekeeping information by each method.

[How to check the amount of timekeeping information deviation by comparing timing information and timing information]
FIGS. 15 and 16 show the operation of the device that receives the first timekeeping information among the control device 12A and the photographing device 3A.
The timekeeping information source devices 2 and 4 are configured to generate timing information as the first timekeeping means, and the timekeeping control means 3a and 12a are configured to acquire the timing information as the second timekeeping means. In the case, for example, in the example shown in FIGS. 15 and 16, the period from when the timing information is input from the timekeeping information source devices 2 and 4 until the next timing information is input by the timekeeping control means 3a and 12a ((N). -1) In the period from the reception of the first pulse to the reception of the Nth pulse), the number of pulses of its own timekeeping units 125 and 37 is counted, and the timekeeping speeds of the timekeeping information source devices 2 and 4 are counted. It will judge the timekeeping speed of its own timekeeping units 125 and 37.

For example, if the output cycle of the first timekeeping information from the timekeeping information source devices 2 and 4 is set to 1 second and the clock of its own timekeeping unit 125, 37 is set to 10 MHz, 10,000,000 per second. The pulse is set to be counted.
However, in reality, the pulse generation rate fluctuates due to fluctuations in the timekeeping means of the timekeeping information source devices 2 and 4, the accuracy of the time-shooting unit 37 on the photographing side or the time-keeping unit 125 on the irradiation side, and changes in temperature. It does not reach 1,,000,000 times, and there is a difference.
This difference is the time difference between the time measuring means of the time measuring information source device 4 and the time measuring means of the photographing device 3A or the control device 12A.

For example, in the case shown in FIG. 15, the number of pulses in the period from the reception of the (N-1) th pulse to the reception of the Nth pulse is 10,000,010 times, which is 10 times from the set value. In the case of a large number, it is possible to recognize that the timekeeping units 125 and 37 of the timekeeping information source device 4 are faster by 10 / 10,000,000.
On the other hand, for example, in the case shown in FIG. 16, the number of pulses during the period from the reception of the (N-1) th pulse to the reception of the Nth pulse is 9,999,990 times, which is based on the set value. When the number of times is 10 times less, it becomes possible to recognize that the timing unit 125, 37 of the clock information source device 4 is slow by 10 / 10,000.

[How to check the amount of timekeeping information deviation by comparing timing information and time information]
The timekeeping information source devices 2 and 4 are configured to generate timing information as the first timekeeping means, and the timekeeping control means 3a and 12a are configured to acquire the time information as the second timekeeping means. In the case, for example, in the example shown in FIGS. 15 and 16, the period from when the timing information is input from the timekeeping information source devices 2 and 4 until the next timing information is input by the timekeeping control means 3a and 12a ((N). -1) During the period from the reception of the first pulse to the reception of the Nth pulse), time information was generated from the timing information such as the pulses of its own timekeeping units 125 and 37, and was generated. From the time information, the time measuring speeds of the own time measuring units 125 and 37 with respect to the time measuring speed of the time measuring information source device 4 are determined.

For example, if the output cycle of the first timekeeping information from the timekeeping information source devices 2 and 4 is set to 1 second and the clock of its own timekeeping unit 125, 37 is set to 10 MHz, 1,000,000 per second. Since the time pulse is generated, the pulse is generated every 0.000000001 seconds. Therefore, it is possible to obtain the time information at each timing by correcting the time information by 0.000000001 seconds for each pulse.
Here, the time information may be corrected for each pulse, but the time information may be corrected after collecting the time information for each of a plurality of pulses. Further, when the time information is inquired, the time information may be collectively corrected.
If the correction of the time information is repeated for 1 second with the settings as described above, the time information becomes 1 second.
However, in reality, the pulse generation rate fluctuates due to fluctuations in the timekeeping means of the timekeeping information source devices 2 and 4, the accuracy of the time-shooting unit 37 on the photographing side or the time-keeping unit 125 on the irradiation side, and changes in temperature. It is not a second, but a difference.
This difference is the time difference between the time measuring means of the time measuring information source device 4 and the time measuring unit 37 on the photographing side or the time measuring unit 125 on the irradiation side.

For example, in the case shown in FIG. 15, the number of pulses in the period from the reception of the (N-1) th pulse to the reception of the Nth pulse is 10,000,010 times, which is 10 times from the set value. In the case of a large number, the period from the reception of the (N-1) th pulse to the reception of the Nth pulse is 1.000001 seconds, which is per second with respect to the timekeeping speed of the timekeeping information source device 4. It is possible to recognize that the timekeeping speed of the own timekeeping units 125 and 37 is high by 0.000001 seconds.
On the other hand, for example, in the case of FIG. 16, the number of pulses in the period from the reception of the (N-1) th pulse to the reception of the Nth pulse is 9,999,990 times, which is 10 from the set value. If the number of times is small, the period from the reception of the (N-1) th pulse to the reception of the Nth pulse is 0.99999 seconds, which is per second with respect to the timekeeping speed of the timekeeping information source device 4. It is possible to recognize that the timekeeping speed of the own timekeeping units 125 and 37 is slow by 0.000001 seconds.

[How to check the amount of timekeeping information deviation by comparing time information and timing information]
FIG. 17 shows the operation of the device that receives the first timekeeping information among the control device 12A and the photographing device 3A.
The timekeeping information source devices 2 and 4 are configured to generate time information as the first timekeeping means, and the timekeeping control means 3a and 12a are configured to acquire the timing information as the second timekeeping means. In the case, for example, in the example shown in FIG. 17, the period from when the time information is input from the timekeeping information source devices 2 and 4 until the next time information is input by the timekeeping control means 3a and 12a ((N-1). ) The number of pulses of its own timekeeping unit 125, 37 is counted in the period from the reception of the third time information to the reception of the Nth time information), and the timekeeping speed of the timekeeping information source devices 2 and 4. It is to judge the timekeeping speed of one's own timekeeping part 125, 37 with respect to.

For example, by acquiring the time at the time point (N-1) and the time at the time point N as time information from the timekeeping information source devices 2 and 4, and calculating the difference between them, the timekeeping control means 3a and 12a ( The length (time) of the period from N-1) to N can be obtained.
On the other hand, when the time information at the (N-1) time point is acquired as the time information from the own timekeeping units 125 and 37, and the timekeeping information at the N time point is acquired, the timekeeping information at the (N-1) time point and the N time point are acquired. By multiplying the difference in the timekeeping information in the above by the count interval of the timekeeping information source device 4, the timekeeping control means 3a and 12a can acquire the period from the time (N-1) to the time N.
Then, the timekeeping control means 3a and 12a compare the period from the (N-1) time point to the N time point and the value obtained by multiplying the timekeeping information of the pulses of its own timekeeping units 125 and 37 by its own pulse interval during this period. By doing so, it is possible to determine the timekeeping speed of the own timekeeping units 125 and 37 with respect to the timekeeping speed of the timekeeping information source device 4.

[How to check the amount of timekeeping information deviation by comparing time information and time information]
The timekeeping information source devices 2 and 4 are configured to generate time information as the first timekeeping means, and the timekeeping control means 3a and 12a are configured to acquire the time information as the second timekeeping means. In the case, for example, in the example shown in FIG. 17, the time at the time point (N-1) and the time at the time point N are acquired as the time information from the timekeeping information source devices 2 and 4, respectively, and the difference between them is calculated. , The timekeeping control means 3a, 12a can acquire the length (time) of the period from the time point (N-1) to the time point N.
On the other hand, by acquiring the time at the (N-1) time point and the time at the N time point respectively as the time information from the own timekeeping units 125 and 37 and calculating the difference between them, the timekeeping control means 3a and 12a can be used. The period from the (N-1) time point to the N time point can be acquired.
Then, the timekeeping control means 3a and 12a have a period from the (N-1) time point to the N time point based on the first timekeeping information and a period from the (N-1) time point to the N time point based on the second timekeeping information. By comparing, it is possible to determine the timekeeping speed of its own timekeeping units 125 and 37 with respect to the timekeeping speed of the timekeeping information source device 4.

By comparing the first timekeeping information and the second timekeeping information using any of the above four methods, the timekeeping speeds of the own timekeeping units 125 and 37 with respect to the timekeeping speeds of the timekeeping information source devices 2 and 4 are determined. can do.

[Judgment that specific conditions are met]
Further, the photographing control unit 31 determines whether or not the specific condition is satisfied based on the acquired first timekeeping information and second timekeeping information.
In the present embodiment, for example, it is determined whether or not the timekeeping accuracy is sufficient by using at least one of the determination methods 1 to 3 as described below, and the specific condition is satisfied when the timekeeping accuracy is not sufficient. It has come to be judged that it has been done.

[Timekeeping accuracy judgment method 1 (difference)]
When the amount of deviation (difference) between the first timekeeping information and the second timekeeping information is used to judge the timekeeping accuracy, for example, the difference between the acquired first timekeeping information and the second timekeeping information is calculated and specified. Determine if the value has been exceeded. Then, when the difference exceeds the specific value, it is determined that the timing accuracy is not sufficient, that is, the specific condition is satisfied.

[Timekeeping accuracy judgment method 2 (change amount)]
When the change in the deviation amount (difference) is used for judgment, for example, the difference between the first timekeeping information and the second timekeeping information is calculated every time the first timekeeping information and the second timekeeping information are acquired. It is stored in the storage unit 35. Then, the amount of change between the memorized difference and the difference calculated before that is calculated, and it is determined whether or not the calculated amount of change exceeds the amount of change calculated before that. Then, when the calculated change amount exceeds the previous change amount, it is determined that the timekeeping accuracy is not sufficient, that is, the specific condition is satisfied.

When the prediction of the difference is used for the determination, for example, the difference between the acquired first timekeeping information and the second timekeeping information and the amount of change thereof are calculated and stored in the storage unit 35. Then, from the memorized difference and the amount of change, it may be determined whether or not the specific value is exceeded when the same change continues for a predetermined period (for example, the photographing period).

In determining that the specific condition is satisfied, the difference between the first timekeeping information and the second timekeeping information and the value of the amount of change may be used as they are, or an average value may be calculated for these values. The change state and future expected value may be calculated by using a method such as linear interpolation or spline interpolation.
When calculating the average value, for example, the difference between the acquired first timekeeping information and the second timekeeping information is calculated and stored in the storage unit 35. Then, the average value is calculated from the plurality of memorized differences. Since the amount of change in the difference may change rapidly, it is possible to deal with such changes by calculating the average value.
The parameters required for linear interpolation and spline interpolation can be obtained by using, for example, the least squares method. As the method for making such a judgment, it is possible to make a more advanced judgment by using the interpolation or extrapolation method used in other fields.

[Specific output]
Further, the timekeeping control means 3a and 12a are adapted to output a specific output when it is determined that the specific condition is satisfied.
Specific outputs in this embodiment include, for example, the following.

[Specific output 1 (correction of timekeeping information)]
In this case, when it is determined that the specific conditions are satisfied, the timekeeping control means 3a and 12a have a small difference between the first timekeeping information of the timekeeping information source devices 2 and 4 and the timekeeping information of their own timekeeping units 125 and 37. The operation of the timing units 125 and 37 is corrected so as to be.
As a method of correction, for example, there are correction of timing information and correction of time information as described below.

[Correction of timing information]
For example, in the example shown in FIGS. 15 and 16, the timekeeping control means 3a and 12a have their own timekeeping unit by the above method during the period from the (N-1) th timekeeping information to the Nth timekeeping information. As a result of checking the speeds of 125 and 37, if it is determined that the specific condition is satisfied, the timekeeping unit 125, itself is used during the period from the Nth timing information to the (N + 1) th timing information. The timing information of 37 can be modified.
As shown in FIG. 15, for example, the method of making corrections can be realized by thinning out or adding pulses for a certain period of time according to the detected speed difference.

For example, in the example shown in FIG. 15, the number of pulses in the period from the reception of the (N-1) th pulse to the reception of the Nth pulse is 10,000,010 times, which is 10 from the set value. If the number of times is large, the pulse may be thinned out once every 1,000,000 times in the period from the reception of the Nth pulse to the reception of the (N + 1) th pulse. .. Alternatively, the pulse generation can be delayed so that the number of pulses is reduced once.
On the other hand, for example, in the example shown in FIG. 16, the number of pulses during the period from the reception of the (N-1) th pulse to the reception of the Nth pulse is 9,999,990, which is a set value. In the case of less than 10 times, in the period from the reception of the Nth pulse to the reception of the (N + 1) th pulse, 2 pulses are set so that the pulse increases once in 1,000,000 times. It can be configured to count times. Alternatively, the pulse generation can be accelerated so that the number of single pulses increases.

The timekeeping control means 3a and 12a may be configured to correct the pulse interval.
For example, when a CR oscillation circuit or an LC oscillation circuit is used as a pulse source, the pulse interval can be easily adjusted by changing the values of C (capacitor), R (resistance), and L (coil).

[Correct time information]
The timekeeping control means 3a and 12a confirmed the timekeeping speeds of their own timekeeping units 125 and 37 by the above method during the period from the (N-1) th timekeeping information to the Nth timekeeping information. When it is determined that the specific condition is satisfied, the time information of the own timekeeping units 125 and 37 is corrected during the period from the Nth time information to the (N + 1) th time information. be able to.

As described above, whether the timekeeping information transmitted from the timekeeping information source devices 2 and 4 is timing information or time information, on the other hand, when the target to be corrected by the timekeeping control means 3a and 12a is timing information. However, even in the case of time information, by using the method as described above, the timekeeping speed of the timekeeping units 125 and 37 should be appropriately corrected according to the difference from the timekeeping speed of the timekeeping information source devices 2 and 4. Is possible.

[Specific output 2 (warning of timekeeping accuracy deviation and permission to shoot)]
When it is determined that the specific conditions are satisfied, the control units 31 and 121 in this case perform the following operations, for example.
・ Notify the user that the timekeeping information has not been corrected for a specified period ・ Notify that shooting is not permitted ・ Do not allow shooting ・ Let the user choose whether to cancel shooting ・ Cancel shooting

Notification can be performed by display on the display unit, light emission, voice, vibration, or the like.
Further, when the photographing is not permitted or stopped, the radiation control unit 121 controls the transmission of the control signal to the high voltage generation unit 122, the transmission of the signal instructing the stop, and the like.
When letting the user select, for example, the option is displayed on the display unit so that the operation is performed based on the operation of the operation unit.
It should be noted that at least one of the above-mentioned actions such as canceling the notification shooting may be performed at the same time.
Further, after stopping the shooting, the timekeeping information of the timekeeping unit 37 on the shooting side may be corrected based on the timekeeping information of the timekeeping information source devices 2 and 4.

In a general radiography system, every time the timekeeping information is periodically transmitted from the first timekeeping means linked to the radiation irradiation device to the second timekeeping means, the timekeeping information of the second timekeeping means is corrected and the radiation irradiation device is used. And some can be synchronized with the radiographer.

When performing serial imaging, the radiography apparatus mainly performs an operation of accumulating electric charges generated by irradiation with radiation in an image receiving unit, an operation of reading and transferring the accumulated electric charges, and an operation of initializing the image receiving unit. Repeat the operation.
For example, by modifying the timekeeping information of the timekeeping means, the length of the accumulation period for accumulating charges in the pixels in the acquisition of a specific frame image is different from the accumulation period in the acquisition of other continuous frame images. In some cases. Then, the image receiving unit makes the amount of electric charge accumulated different by the difference in the length of the period.
For example, when the timekeeping information of the timekeeping means is modified so that the accumulation period in the acquisition of a specific frame image becomes longer than the accumulation period in the acquisition of other consecutive frame images, in the acquisition of the specific frame image. , The image receiving unit receives images longer than the accumulation period in the shooting of other continuous frame images. That is, the image receiving unit accumulates charges longer than the accumulation period in the acquisition of other continuous frame images.

To deal with such problems, by controlling the operation of the radiation irradiation device to irradiate, for example, pulsed radiation only for a part of the accumulation period, even if the length of the accumulation period is different, each accumulation period It is possible to keep the amount of radiation from the radiation irradiation device in the above constant.
However, the image receiving unit generates and accumulates electric charges not only by the radiation emitted from the irradiation apparatus but also by the scattered rays emitted from the outside and the subject S. In order to remove this, a grid for removing scattered rays may be placed between the subject S and the image receiving portion for imaging, but even with this, the scattered rays cannot be completely removed. That is, even if the operation of the radiation irradiation device is controlled so as to irradiate radiation only for a part of the accumulation period, the image reception by the scattered rays, that is, the accumulation of electric charges cannot be stopped. Therefore, if the time of the time measuring means is changed and the length of the storage period in the shooting of a specific frame image is different from the storage period in the shooting of other continuous frame images, the time of the time measuring means is changed. Only when the specific frame image is changed, the image is affected by scattered rays to a degree different from that of other continuous frame images.

However, the photographing system 100A according to the present embodiment determines whether or not the specific condition is satisfied by the photographing apparatus 3A (determining means) when the first timing information is transmitted from the timing information source devices 2 and 4. Only when it is established, the timekeeping information of the photographing side timekeeping unit 37 (second timekeeping means) is corrected. Therefore, when the difference in the timekeeping information of each timekeeping part deviates to the extent that the content (diagnosis) of the image is affected, appropriate measures can be taken only at an appropriate timing.

[Timekeeping accuracy judgment method 4]
In order for the photographing system 100A according to the above embodiment to perform various operations as described above, at least one of the timekeeping information source devices 2 and 4 and the device for receiving the first timekeeping information (control device 12A and photographing device 3A). ) Is established. Therefore, depending on the usage environment of the photographing system 100A, communication may not be established (the various operations described above are not performed), and the operations of the irradiation device 1 and the photographing device 3A may deviate from each other.
Therefore, the photographing system 100A of the above-described embodiment may be provided with a function of detecting a deviation in operation in the following manner.

Specifically, as shown in FIG. 18, the device that receives the first timekeeping information among the control device 12A and the photographing device 3B counts in conjunction with the photographing device 3B separately from the photographing side timing unit 37. The second photographing side timing unit 39A to perform is provided.
Then, the timekeeping control means 3a and 12a are provided with a function of resetting the timekeeping information of the second photographing side timekeeping unit 39A when the first timekeeping information is received from the timekeeping information source devices 2 and 4.
The reset second photographing side timing unit 39A counts from the initial value again.
Then, the timekeeping control means 3a and 12a are provided with a function of determining whether or not the timekeeping information of the second photographing side timekeeping unit 39A exceeds a predetermined threshold value.

As shown in FIG. 19, the imaging system 100A of the present embodiment configured in this way captures images when there is no abnormality in communication between the timekeeping information source devices 2 and 4 and the imaging devices 3B (t0 to t1). Every time the device 3B receives the first timekeeping information, the second photographing side timekeeping unit 39A repeatedly resets the timekeeping information, so that the timekeeping information does not exceed the threshold value. However, when an abnormality occurs in the communication between the timekeeping information source devices 2 and 4 and the timekeeping device 3B and the first timekeeping information cannot be received from the timekeeping information source device (t1 to t2), the timekeeping unit 37 on the photographing side outputs the timekeeping information. Without correction, the second photographing side timing unit 39A continues counting without resetting the timing information. Eventually, when the timekeeping information of the second shooting side timekeeping unit 39A exceeds the threshold value (t3), the shooting device 3B uses the timekeeping information of the shooting side timekeeping unit for a predetermined period as the first timekeeping information of the timekeeping information source devices 2 and 4. Detects that it could not be corrected with, and outputs to that effect.

At the time of output, at least one of the following operations when it is determined that the specific condition is satisfied in the above embodiment may be performed at the same time.
・ Notify the user that the timekeeping information has not been corrected for a specified period ・ Notify that shooting is not permitted ・ Do not allow shooting ・ Let the user choose whether to cancel shooting ・ Cancel shooting

After that, when the communication is restored and the first timekeeping information is received, the timekeeping unit 39A on the second shooting side resets the timekeeping information (t4), so that the shooting system 100A returns to the original operation.

If the imaging system 100A according to the above embodiment is configured in this way, the timing information of the timing units 37 and 125 cannot be corrected by the second timing unit 39A with the first timing information for a predetermined period. In that case, it is possible to grasp this and measure the length of a predetermined period.
In addition, by comparing the timekeeping information of the second imaging side timing section with the threshold value, it is determined whether or not the deviation between the timing information of the first timing section and the timing information of the photographing side timing section is within the allowable range. If it is out of the permissible range, it is possible to take appropriate measures.

[Timekeeping accuracy judgment method 5]
Further, in view of the problem that communication may not be established and the operations of the irradiation device 1 and the photographing device 3A may be deviated depending on the usage environment of the photographing system 100A described above, the photographing system 100A of the above-described embodiment is used. It may be provided with a function of detecting a deviation in operation in the following form.

Specifically, as shown in FIG. 20, the device that receives the first timekeeping information among the control device 12A and the photographing device 3C is provided with a memory 39B instead of the second photographing side timing unit 39A.
When the first timekeeping information is received from the timekeeping information source devices 2 and 4, the memory 39B is configured to store the first timekeeping information (= the timekeeping information of the shooting side timekeeping unit 37 after correction).
It should be noted that the storage unit 35 may be provided with the function without the memory 39B.
Then, the timekeeping control means 3a and 12a are provided with a function of determining whether or not the difference between the timekeeping information of the photographing side timekeeping unit 37 and the stored value of the memory 39B exceeds a predetermined threshold value.

As shown in FIG. 21, the photographing system 100A of the present embodiment configured in this way is when there is no abnormality in communication between the timekeeping information source devices 2 and 4 and the photographing device 3C (between t0 and t1). Since the memory 39B stores the first time information every time the photographing device 3C receives the first time information, the difference between the time information of the photographing side time unit 37 and the first time information of the memory 39B exceeds the threshold value. There is no. However, when an abnormality occurs in the communication between the timekeeping information source devices 2 and 4 and the timekeeping device 3C and the first timekeeping information cannot be received from the timekeeping information source devices 2 and 4 (t1 to t2), the timekeeping unit 37 on the photographing side The memory 39B does not update the first timekeeping information without correcting the timekeeping information. Eventually, when the difference between the timekeeping information and the old first timekeeping information of the memory 39B exceeds the threshold value, the photographing device 3C obtains the timed information of the photographing side timekeeping unit as the timekeeping information source for a predetermined period as in the above-mentioned photographing device 3B. It detects that it could not be corrected by the first timekeeping information of the devices 2 and 4, and outputs to that effect.

At the time of output, at least one of the following operations when it is determined that the specific condition is satisfied described in the above-mentioned "Timekeeping accuracy determination method 4" may be performed at the same time.
After that, when the communication is restored and the first timekeeping information is received, the memory 39B updates the first timekeeping information, so that the photographing system 100A returns to the original operation.

If the imaging system 100A according to the above embodiment is configured in this way, the timekeeping unit 39A on the second imaging side is not used, that is, the number of timekeeping units is smaller than that of the first embodiment, and the timekeeping unit is used for a predetermined period. When the timekeeping information of 37 and 125 cannot be corrected by the first timekeeping information, it can be grasped.

Next, various problems that may occur in the photographing systems 100, 100A, 100B, and 100A according to each embodiment of the above-described embodiments, and specific examples for solving those problems will be described.

[Example 1-1]
The console 14 controls the entire shooting system 100, that is, an operating state of a device that transmits / receives information to / from each device of the shooting system 100 or a system other than the shooting system 100 (whether the operating state is a normal operating state). It includes operating states such as whether it is in an abnormal operating state, or whether it is in a start-up or end-operation state.), And information is sent and received between each device of the shooting system 100 and a system other than the shooting system. It synchronizes the equipment to be performed. However, in the above embodiment, since the timekeeping information source devices 2 and 4 are connected to the control device 12 instead of the console 14, the console 14 must perform processing such as synchronization confirmation via the control device 12. However, the processing efficiency was low.
In view of such a problem, for example, as shown in FIG. 22, the timekeeping information source devices 2 and 4 may be connected to the console 14. By doing so, since the timekeeping information source devices 2 and 4 and the console 14 are directly connected, the console 14 can efficiently perform processing such as synchronization confirmation.

The timekeeping information source devices 2 and 4 and the console 14 may be connected, and the timekeeping information source devices 2 and 4 and the control device 12 may be connected. By doing so, not only the console 14 but also the control device 12 can be synchronized with the timekeeping information source devices 2 and 4, so that the control device 12 and the console 14 can be synchronized with the photographing device 3, respectively.
Further, in this case, the process of confirming whether or not the operation timings of the control device 12 and the console 14 are not deviated may be performed. In this way, control is performed when either the timekeeping information source devices 2 and 4 and the control device 12 cannot be synchronized or the timekeeping information source devices 2 and 4 and the console 14 cannot be synchronized due to a communication failure or the like. Since the operation timing of the device 12 and the operation timing of the console 14 deviate from each other, it is possible to stop shooting and display a warning by detecting the difference.

[Example 1-2]
In the above embodiment, when the timekeeping information source devices 2 and 4 and the control device 12 or the console 14 are connected by wire, it is necessary to synchronize between them, so that it is necessary to connect them by a dedicated line. ..

In view of such problems, in the above embodiment, as shown in FIG. 23, the timekeeping information source devices 2 and 4 and the photographing device 3 are wirelessly connected, and the timekeeping information source devices 2 and 4 and the control device are connected. 12 may be connected wirelessly.
At that time, for example, by using the TSF defined by the communication standard of IEEE802.11, that is, by the first timekeeping information transmitted from the timekeeping information source devices 2 and 4, the timekeeping of the timekeeping unit 37 on the shooting side of the timekeeping device 3 By updating the information, the timekeeping information of both timekeeping units can be synchronized.

By doing so, the synchronization between the timekeeping information source devices 2 and 4 and the photographing device 3 and the synchronization between the timekeeping information source devices 2 and 4 and the control device 12 can be performed using the same timekeeping information. Is possible. Therefore, time synchronization can be performed without running a cable around the subject S. Further, since the timekeeping information is updated based on the same first timekeeping information, it is possible to reduce the operation deviation between the control device 12 and the photographing device 3, and to compensate for the synchronization deviation with other devices. No additional configuration is required. Further, since the timekeeping information is updated using the same radio wave, the deviation can be reduced.

Instead of connecting the timekeeping information source devices 2 and 4 and the control device 12 wirelessly, the timekeeping information source devices 2 and 4 and the console 14 may be connected wirelessly and synchronized.
Further, the timekeeping information source devices 2 and 4 and the control device 12 may be wirelessly connected, and the timekeeping information source devices 2 and 4 and the console 14 may be wirelessly connected to synchronize.

[Example 1-3]
In the above embodiment, when the timekeeping information source devices 2 and 4 and the control device 12 are directly connected, the arrangement of the timekeeping information source devices 2 and 4, the control device 12, and the cable connecting them is restricted. There was a problem that there was something.
Further, if the timekeeping information source devices 2 and 4 and the control device 12 are directly connected, the connection distance becomes long, so that the possibility of communication failure between the timekeeping information source devices 2 and 4 and the control device 12 increases. There was a problem that it would end up.

In view of such a problem, in the above embodiment, as shown in FIG. 24, the timekeeping information source devices 2 and 4 and the radiation control device may be connected via the network device 5. Examples of the network device 5 include HUB.
At that time, a dedicated line with a small time delay is used for the connection between the time measuring information source devices 2 and 4 and the network device 5, and the connection between the network device 5 and the control device 12, and the time synchronization of the wired communication specified by IEEE1588 is used. It is preferable to use.

By doing so, it is possible to reduce the restrictions on arranging the timekeeping information source devices 2 and 4, the control device 12, and the cable.
In addition, by connecting via the network device 5, it is possible to prevent the communication signal from deteriorating by wiring over a long distance without sandwiching the device in the middle, and it is possible to improve the reliability of communication. Become.

[Example 1-4]
In the above embodiment, when synchronization is performed by a signal from the outside using the timekeeping information, there is a problem that it is not possible to determine whether or not synchronization is achieved on the photographing device 3 side. Specifically, when wireless communication cannot be performed due to radio wave interference or the like, even if the photographing device 3 can understand that the synchronization may be out of sync, it cannot be transmitted to the control device 12. , Irradiation could not be stopped.

In view of such a problem, in the above embodiment, as shown in FIG. 25, the timekeeping information source devices 2 and 4 are built in the photographing device 3, and the first timing information is transmitted from the photographing device 3 to the control device 12. By doing so, synchronization may be achieved.
In this case, it is preferable that the control device 12 is provided with a time measuring unit so that the control device 12 synchronizes.
In this way, if synchronization is not achieved for a certain period of time and there is a possibility that the operation is out of alignment, the control device 12 can grasp the situation, so that wireless communication with the photographing device 3 cannot be performed. Even in some cases, it is possible to stop the irradiation.
Further, since it is not necessary to go through the timekeeping information source devices 2 and 4 on the way, it is possible to reduce the risk that communication is delayed due to an abnormality in the timekeeping information source devices 2 and 4.

[Example 1-5]
In the above embodiment, the radiation device 12 that does not support wireless communication has a problem that time synchronization using wireless cannot be performed.
In view of such a problem, in the above embodiment, as shown in FIG. 26, a communication module 16 capable of receiving radio waves from the timekeeping information source devices 2 and 4 is connected to the control device 12 for timekeeping. The reference time from the information source devices 2 and 4 may be received via the communication module 16.
For the connection between the communication module 16 and the control device 12, it is preferable to use a dedicated line having a small time delay and to use the time synchronization of the wired communication specified by IEEE1588.

By doing so, it is possible to synchronize the time using wireless even with a radiation control device that does not support wireless communication.
Further, since the communication module 16 only receives, the radio signal is not emitted from the communication module 16 or the irradiation device 1. Therefore, it is possible to reduce the risk of malfunction caused by the emission of the radio signal.
If it is not necessary to consider the problem of radio signal emission from the communication module 16 or the irradiation device 1, it does not prevent the communication module from having a transmission function.

[Example 1-6]
In the above embodiment, when it is desired to compare a captured still image or a dynamic image with a measurement result or a captured image by another device, the imaging system 100 and another device are used to ensure that the images are captured at the same timing. Need to synchronize with. For example, when shooting in synchronization with the heartbeat, it is necessary to shoot at the same timing as the heartbeat, or to extract an image of the heartbeat timing from the shot continuous shooting, or to shoot the shot continuous shooting. It is necessary to associate the heart rate data with the heart rate data, and it is necessary to synchronize the time.

In view of such a problem, in the above embodiment, as shown in FIG. 27, the photographing system 100 and the other device 6 are the same as the timekeeping information source devices 2 and 4 and the control device 12 or the photographing device 3. It may be connected by a communication means and synchronized based on the first timekeeping information from the timekeeping information source devices 2 and 4.
By doing so, it is possible to take a picture synchronized with the other device 5. For example, by connecting a heart rate monitor as another device 5 to control timely timing and to store and display the timing, shooting can be performed in synchronization with the heartbeat, and the captured dynamic image is captured at which timing of the heartbeat. It is possible to make a diagnosis by confirming whether the image is made.
Further, examples of the other device 5 are not limited to the above-mentioned heartbeat, but various devices such as a respiratory state measuring device such as a spirometer, a mutation sensor for measuring motion, and an acceleration sensor, depending on the object to be imaged, are used. Can be used.
It should be noted that any or all of the other devices 5, the control device 12, and the photographing device 3 may be provided with means for storing the timekeeping information.
Further, by storing the timekeeping information, the information measured or photographed at the same time can be organized or extracted from the timekeeping information and output.

[Example 1-7]
In the above embodiment, since the communication unit that transmits / receives timekeeping information for synchronization also transmits / receives data, the amount of data that can be transmitted / received and the transmission / reception speed are limited, the transmission / reception of data is delayed, or the data is transmitted. There was a problem that it disappeared in the middle of transmission and reception.

In view of such a problem, in the above embodiment, as shown in FIG. 28, the timekeeping information source devices 2 and 4 and the control device 12 may be connected by a plurality of different communication means.
For example, the timekeeping information source devices 2 and 4 and the control device 12 are wirelessly connected, and the timekeeping information for synchronizing the times of both timekeeping means is transmitted and received wirelessly, and the timekeeping information source devices 2 and 4 are transmitted and received. And the control device 12 are also connected by wire (Ethernet, etc.), and information other than time synchronization (for example, radiation irradiation conditions, radiation irradiation period, etc.) is transmitted and received by wire.

In this way, the communication means for time synchronization and the communication means for information transmission / reception can be separated, and information transmission / reception and time synchronization can be performed without delaying information transmission / reception or loss of information. Can be realized at the same time.
In addition, communication means suitable for time synchronization and information transmission / reception can be selected.

[Example 1-8]
In the above embodiment, for example, as shown in FIG. 29, the imaging device 3D may be provided with a second imaging side timing unit 39D different from the above embodiment. The second photographing side timing unit 39D can be configured by using, for example, a radio clock, GPS, NTP, or the like. When using a radio clock, GPS, or the like, an antenna for receiving radio waves may be arranged.
Then, by comparing the timing information of the photographing side timing unit 37 with the timing information of the second photographing side timing unit 39D at an appropriate timing, the deviation of the timing information between the photographing side timing unit 37 and the second photographing side timing unit 39D is obtained. To detect.

By doing so, as shown in FIG. 30, the communication between the timekeeping information source devices 2 and 4 and the photographing device 3 is interrupted, and the first timekeeping information of the timekeeping information source devices 2 and 4 and the time measuring unit 37 on the photographing side Even if the deviation from the second timekeeping information gradually increases, it is possible to detect that the deviation has occurred by comparing the timekeeping information of the shooting side timekeeping unit 37 with the timekeeping information of the second shooting side timekeeping unit 39D. ..
In addition, if the difference (deviation amount) of the timekeeping information of both timekeeping parts is calculated and compared with the predetermined value, and it is determined that the predetermined value is exceeded, it is possible to grasp whether or not the accuracy of time synchronization is sufficient. Can be done. When the deviation amount exceeds a predetermined value, as in the above embodiment, output such as notifying that the deviation amount exceeds the predetermined value, notifying that shooting is not permitted, or stopping shooting, etc. You just have to do.

Note that FIG. 30 illustrates a case where the second photographing side time measuring unit 39D detects the deviation only during the synchronization failure period when the timing information source devices 2 and 4 and the photographing device 3 cannot be synchronized, but the synchronization fails. The deviation may be detected by the second photographing side time measuring unit 39D not only during the period but also during the synchronization period in which the time measuring information source devices 2 and 4 are synchronized.

[Example 1-9]
In the above-mentioned Example 1-8, the timekeeping information of the timekeeping unit 37 on the shooting side is updated to the timekeeping information of the timekeeping unit 39D on the second shooting side, or the timekeeping information of the timekeeping unit 39D on the second shooting side is taken by the shooting control unit 31. The timekeeping information of the side timekeeping unit 37 may be controlled to be updated.
By doing so, as shown in FIG. 31, during the period when the timekeeping information source devices 2 and 4 and the photographing device 3 are communicating, the photographing device 3 is the second of the timekeeping information source devices 2 and 4. The timekeeping information of the timekeeping unit 37 on the shooting side is updated periodically using the timekeeping information, and even after the timekeeping information source devices 2 and 4 and the timekeeping device 3 cannot be synchronized in the middle, the second timekeeping on the shooting side is performed. The timekeeping information of the photographing side timekeeping unit 37 is periodically updated by using the timekeeping information of the unit 39D.
Therefore, even if the communication between the timekeeping information source devices 2 and 4 and the photographing device 3 is interrupted, the time synchronization with the timing information source devices 2 and 4 can be continued, and the photographing can be continued. ..

Note that FIG. 31 illustrates a case where the timekeeping information of the timekeeping unit 37 on the shooting side is updated by the second timekeeping unit 39D on the shooting side only during the period when the communication between the timekeeping information source devices 2 and 4 and the timekeeping device 3 is interrupted. However, even during the period in which the timekeeping information source devices 2 and 4 are synchronized, the timekeeping information of the timekeeping unit 37 on the photographing side may be updated by the timekeeping unit 39D on the second photographing side.

[Example 1-10]
In the above Examples 1-8 and 1-9, a measuring means for measuring the reliability of communication between the second photographing side timing unit 39D and the outside may be provided.
For example, when the second photographing side time measuring unit 39D is a method using a radio wave such as a radio clock or GPS, a device for measuring the strength of the radio wave is arranged as a measuring means.
Then, the photographing control unit 31 controls to periodically compare the measured value by the device with the predetermined value, and determines that the reliability of communication cannot be ensured when the measured value falls below the predetermined value, and informs the user. The output such as notifying that the reliability of the third time measuring means is deteriorated, notifying that the shooting is not permitted, or stopping the shooting is made to be performed.
By doing so, it is possible to prevent the subject S from being unnecessarily exposed to radiation due to erroneous imaging in a state where the communication reliability of the second imaging side timing unit 39D is lowered.

[Example 1-11]
In the above embodiment, for example, as shown in FIG. 32, the timekeeping information is updated only before the shooting period (shifting from the standby state to the execution), and the timekeeping information is not updated during the shooting period. The difference (deviation amount) between the first timekeeping information of the information source devices 2 and 4 and the timekeeping information of the photographing side measuring unit 37 may be monitored only.
The timing of monitoring includes the time synchronization timing between the timekeeping information source devices 2 and 4 and the photographing device 3 (the transmission timing of the first timekeeping information of the timekeeping information source devices 2 and 4), the predetermined timing in the photographing side measuring unit 37, and the like. do it.

It should be noted that monitoring may be started at both the time synchronization timing of the timekeeping information source devices 2 and 4 and the predetermined timing of the photographing device 3. By doing so, even if any of the timekeeping information source devices 2 and 4 and the time measuring unit 37 on the photographing side has a problem, it is possible to monitor the amount of deviation.
When the second photographing side timing unit 39D as described in the above Examples 1-9 to 1-11 is provided, the timing information of the photographing side timing unit 37 and the timing information of the second photographing side timing unit 39D are used. You may want to monitor the difference between the two. In that case, the deviation amount may be monitored at a predetermined timing in the second photographing side timing unit 39D.

[Example 1-12]
In the above embodiment, the communication unit 36 or the photography control unit 31 of the photographing apparatus 3 may be provided with a monitoring function for monitoring whether or not the state in which communication is normally established is maintained.
Then, when the photographing control unit 31 or the communication unit 36 having such a monitoring function detects that the communication is disconnected, it is determined that the communication is not maintained in the normally established state, and the user is notified of the communication. Outputs such as notifying that the connection is disconnected, notifying that shooting is not permitted, or stopping shooting.
By doing so, it is possible to prevent the subject S from being unnecessarily exposed to radiation by erroneously taking an image in a state where communication is not normally established.

[Example 2-1]
In the above embodiment, if shooting is started without confirming whether or not synchronization is achieved before shooting, the desired shooting result cannot be obtained, the shooting ends in failure, and reshooting is performed. There is a problem that the subject S is unnecessarily exposed.

In view of such a problem, in the embodiment of the above embodiment, as shown in FIG. 33, the time synchronization may be confirmed at the start of shooting, such as when the exposure switch is pressed. (Step S1). Then, as a result of confirmation, when the times are synchronized with a desired accuracy or higher (step S1: Yes), shooting is permitted (step S2), and the shooting operation is started (step S3). On the other hand, when the time synchronization accuracy is not sufficient (step S1: No), the user is notified that synchronization is not possible, the shooting is not permitted, or the shooting is stopped. Take action (step S4).
It is preferable that the determination of whether or not to notify the user or whether or not to notify that the shooting is not permitted is changed according to the amount of time synchronization deviation.
By doing so, it is possible to prevent the subject S from being unnecessarily exposed to radiation by erroneously taking a picture in a state where the synchronization is not achieved.

[Example 2-2]
In Example 2-1 above, as shown in FIG. 34, after the operation of step S4, the synchronization process may be performed again (step S11), and then the operations of steps S1 to S4 may be repeated.
When the synchronization process is performed again, the notification or the shooting may be canceled.
Further, it is preferable to change the determination of whether or not to notify the user or whether or not to notify that the shooting is not permitted according to the amount of time synchronization deviation.
By doing so, it is possible to take pictures in a state of being out of synchronization and more reliably prevent the subject S from being unnecessarily exposed to radiation.

[Example 2-3]
In the second embodiment, as shown in FIG. 35, after the second step S4, the timekeeping information source devices 2 and 4 and the control device 12, and the timekeeping information source devices 2 and 4 and the photographing device 3 are provided. Reconnection may be performed (step S21), and then the operations of steps S1 to S4 may be repeated.
If the time synchronization accuracy is not sufficient even if the communication is disconnected and reconnected, the user is notified that synchronization is not possible, that shooting is not permitted, or shooting is stopped. It is preferable to take measures such as
Further, it is preferable to change the determination of whether or not to notify the user or whether or not to notify that the shooting is not permitted according to the amount of time synchronization deviation.
By doing so, it is possible to take pictures in a state of being out of synchronization and more reliably prevent the subject S from being unnecessarily exposed to radiation.

[Example 2-4]
In the second embodiment, as shown in FIG. 36, after the third step S4, the timekeeping information source devices 2 and 4 are restarted (step S31), and then the operations of steps S1 to S4 are performed. You may repeat it.
Even if the power of the timekeeping information source devices 2 and 4 is turned off, the timekeeping information source devices 2 and 4 are restarted and then reconnected, if the time synchronization accuracy is not sufficient, the user can be synchronized. It is preferable to take measures such as notifying that there is no such thing, notifying that shooting is not permitted, or stopping shooting.
Further, it is preferable to change the determination of whether or not to notify the user or whether or not to notify that the shooting is not permitted according to the amount of time synchronization deviation.
By doing so, it is possible to take pictures in a state of being out of synchronization and more reliably prevent the subject S from being unnecessarily exposed to radiation.

[Example 2-5]
In the above embodiment, there is a problem that there is no method for instructing the synchronization processing even if the user wants to perform the synchronization processing at a desired timing.
In view of such a problem, in the above embodiment, as shown in FIG. 37, a specific operation button 3b is provided on the photographing device 3, and the synchronization process is performed when the operation button 3b is pressed. May be good.
By doing so, it is possible to synchronize the time between the photographing device 3 and the timekeeping information source devices 2 and 4 at the timing desired by the user.

It should be noted that the synchronization process may be performed when a special operation is performed, such as when the operation button 3b is pressed for a long time or when the operation button 3b is pressed a plurality of times.
By doing so, since the other buttons originally provided can be used as the operation buttons 3b, it is possible to cope with the photographing device 3 without increasing the number of buttons too much.

[Example 3-1]
In the above embodiment, as a result of continuing the imaging even though the operation of the irradiation device 1 and the operation of the imaging device 3 are greatly deviated, the imaging fails, and the subject S is unnecessarily exposed to radiation. There was a problem.
In view of such a problem, in the above embodiment, according to the difference (deviation amount) between the first timekeeping information of the timekeeping information source devices 2 and 4 and the second timekeeping information of the time-taking side measuring unit 37 of the photographing device 3. , The user may be notified or the shooting may be stopped.

Specifically, the imaging control unit 31 or the like is provided with a function of comparing the deviation amount with a predetermined threshold value, and when the deviation amount exceeds the threshold value, a warning is displayed to the user or irradiation with radiation is performed. Try to stop shooting.
By doing so, it is possible to take an image in a state of being out of synchronization and prevent the subject S from being unnecessarily exposed to radiation.

As shown in FIG. 38, two threshold values, large and small, are provided, a warning is given when the deviation amount exceeds the threshold value 1 (lower one), and shooting is stopped when the threshold value 2 (higher one) is exceeded. You may do so.
Further, even when the deviation amount exceeds the threshold value 1 for warning, the warning display may not be performed when the deviation amount tends to decrease as in the time zone in the range of (2).

[Example 3-2]
In the embodiment described in the above-mentioned Example 3-1 the above-mentioned Example 3 solves the problem that the operation of the irradiation device 1 and the operation of the photographing apparatus 3 are largely deviated from each other, but the photographing is continued. In -1, the user is notified or the shooting is stopped according to the actual amount of deviation, but the future deviation is predicted and the user is notified according to the predicted deviation. , You may want to stop shooting.

Specifically, in the storage unit 31, the difference (deviation amount) between the shooting time (number of sheets) in the past shooting, the first timekeeping information of the timekeeping information source devices 2 and 4, and the second timekeeping information of the timekeeping unit 37 on the shooting side. Remember the relationship with.
Then, the shooting control unit 31 serves as a predicting means for predicting the amount of deviation when shooting up to the number of shots set in the new shooting this time, based on the relationship between the stored past shooting time and the amount of deviation. Function, function as a comparison means to compare the predicted deviation amount with a predetermined threshold value, when it is judged that the predicted deviation amount exceeds the threshold value, if it is determined that the predicted deviation amount exceeds the threshold value, the synchronization will be out of sync and the shooting will fail. It has a function as an output means for outputting such as notifying that there is a possibility of shooting, notifying that shooting is not permitted, or stopping shooting.
By doing so, it is possible to take pictures in a state of being out of synchronization and reduce the risk that the subject S may be unnecessarily exposed to radiation.

As shown in FIG. 39, two threshold values, large and small, are provided, and as in case 1, it is predicted that the deviation amount exceeds the threshold value 1 (lower one) but does not exceed the threshold value 2 (higher one), that is, If it is determined that the deviation does not significantly affect the shooting, a warning is given, and if it is predicted that the threshold value 2 will be clearly exceeded as in case 2, that is, if the shooting is continued until the end, the shooting will always fail. In this case, the photographer may be notified that the image may be out of sync to the extent that the image is affected during the shooting period, or the shooting may be stopped.

[Example 3-3]
An image that can be used for diagnosis even when the difference (deviation amount) between the first timekeeping information of the timekeeping information source devices 2 and 4 and the second timekeeping information of the photographing side timekeeping unit 37 exceeds a certain threshold. May be obtained. In the above embodiment, when the deviation amount exceeds the threshold value, the shooting is stopped by itself, or the user is urged to stop the shooting by notifying the user. Therefore, when the deviation amount exceeds the threshold value, the images are taken by then. There is a problem that the image is also wasted and the subject S may be unnecessarily exposed.

In view of such a problem, in the above embodiment, even if the deviation amount exceeds the threshold value, shooting may be continued up to a predetermined number of images, and a notification to that effect may be given later.
Specifically, a comparison means for comparing the difference (deviation amount) between the first timekeeping information of the timekeeping information source devices 2 and 4 and the second timekeeping information of the timekeeping unit 37 on the shooting side with a predetermined threshold value in the shooting control unit 31. To have the function as.
Further, the shooting control unit 31 is provided with a function as a notification means for storing the fact when it is determined that the deviation amount exceeds the threshold value and notifying the user during or after the shooting period.
By doing so, even if the amount of deviation becomes large to some extent, an image that can be used for diagnosis can be obtained, so that the risk of unnecessarily exposing the subject S can be reduced.

When the deviation amount exceeds the threshold value, the period during which the threshold value was exceeded is memorized, or specific information (flag, etc.) is associated with the image data of the image taken during the period when the threshold value is exceeded. You may come. By doing so, when checking the image later, it is possible to identify which image was taken during the period exceeding the threshold value.
Further, as shown in FIG. 40, two threshold values, large and small, are provided, and as in case 1, the period in which the deviation amount exceeds the threshold value 1 (lower one) (the deviation to the extent of warning occurs) and the case 2. As such, the period in which the threshold value 2 (higher one) is exceeded (the deviation occurs so that it is necessary to stop shooting) may be stored.

[Example 4-1]
In the above embodiment, if the first timekeeping information of the timekeeping information source devices 2 and 4 and the timekeeping information of the photographing side timekeeping unit 37 are matched at once, the timekeeping information of the timekeeping unit to be updated greatly fluctuates. There was a problem that the resulting trouble occurred.
For example, the timekeeping information fluctuates so much that the timings of occurrence of a plurality of events are straddled at once, and radiation irradiation, charge accumulation, reading / transfer, etc. are performed at the same time, resulting in problems such as poor shooting.

In view of such a problem, in the above embodiment, when it becomes necessary to update the timekeeping information during the shooting period, the timekeeping information may be gradually brought closer to each other instead of being matched and synchronized.
Specifically, each time the first timekeeping information is transmitted and received, the difference (deviation amount) between the first timekeeping information of the timekeeping information source devices 2 and 4 and the second timekeeping information of the photographing side timekeeping unit 37 becomes smaller little by little. I will update it so that it becomes.
As shown in FIG. 41, “little by little” may be, for example, a predetermined ratio (○% or the like) with respect to the deviation amount, or a predetermined amount (1 / ○ or the like) with respect to the deviation amount.
By doing so, it is possible to prevent the occurrence of a problem caused by a large change in the timekeeping information.
On the other hand, if the amount of deviation is large, it may be necessary to wait for a long time because the amount of deviation becomes small to the extent that the captured image is not affected if the time difference is gradually reduced without synchronizing as described above. Occurs.
Therefore, depending on the magnitude of the deviation amount, the time change amount to be corrected so that the deviation amount becomes small may be controlled to be large.

[Example 4-2]
In the above embodiment, if the first timekeeping information of the timekeeping information source devices 2 and 4 and the timekeeping information of the photographing side timekeeping unit 37 are matched at once, the timekeeping information of the timekeeping unit to be updated is larger than the timekeeping information up to that point. There was a problem that it became smaller (time returned) and problems caused by it occurred.
For example, as shown in FIG. 42 (a), after the timekeeping information exceeds the time when a certain event is generated, the timekeeping information is returned to the timekeeping information before the time when the event is generated by updating, and the same event is repeated twice. There was a problem that it would end up. When the event is irradiation, the subject S is unnecessarily exposed by repeating the irradiation, or the radiation R is irradiated twice only to the frame taken when the irradiation is repeated, and the image quality is different from the others. Will be generated.

In view of such a problem, in the above embodiment, when it is detected that the timekeeping information of both timekeeping parts is deviated, the timekeeping speed of at least one of the timekeeping parts may be adjusted.
Specifically, as shown in FIG. 42 (b), when the first timekeeping information is transmitted and received, the timekeeping speed of the faster timekeeping part is lowered or the slower timekeeping is performed without updating the timekeeping information. By increasing the timekeeping speed of the unit, the amount of deviation when transmitting and receiving the first timekeeping information later is settled to the extent that the timekeeping information does not need to be updated.
By doing so, it is possible to prevent the occurrence of problems caused by the small amount of timekeeping information.

[Example 4-3]
In response to the problem mentioned in Example 4-2 that the timekeeping information becomes smaller due to the update and the same event may be repeated, in Example 4-2, the timekeeping speed of the timekeeping section is changed. As shown in FIG. 43, an event non-occurrence period Td that regulates the occurrence of the same type of event may be set immediately after the event occurs.
By doing so, it is possible to prevent the occurrence of a problem that the same event is repeated without changing the time measuring speed of the time measuring unit.

[Example 5-1]
In the above embodiment, when the communication between the timekeeping information source devices 2 and 4 (irradiation device 1) and the photographing device 3 is interrupted, it is possible to shoot to what extent even if it is possible to continuously shoot. I had to stop shooting because I wasn't sure if it was there.

In view of such a problem, in the above embodiment, the number of possible shots is calculated based on the time measuring speed of the time measuring information source devices 2 and 4 and the time measuring unit 37 on the photographing side and the accuracy thereof, and until the calculated number of possible photographs is reached. May continue shooting.
Specifically, the storage unit 35 stores in advance the relationship between the vibration cycle and the factors that affect the accuracy of the vibration cycle of the oscillators of the irradiation device 1 and the photographing device 3.
Further, the difference (deviation amount) between the first timekeeping information of the timekeeping information source devices 2 and 4 and the second timekeeping information of the shooting side timekeeping unit 37 immediately after the connection to the photographing control unit 31 is interrupted, and immediately after the connection is disconnected. First, it is provided with a function of predicting a change in the amount of deviation based on the relationship between the timing speed of the time measuring unit 37 on the photographing side and the factor stored in the imaging control unit 31 and the accuracy. As shown in FIG. 44, this change in the amount of deviation may increase or decrease depending on the accuracy at that time.
Further, the imaging control unit 31 calculates the imaging possible time required for the displacement amount to exceed a predetermined threshold value (the upper limit of the displacement amount for irradiating the radiation during the accumulation period) based on the predicted change in the displacement amount. Have the function to do.
Further, the shooting control unit 31 is provided with a function of calculating the number of shootable sheets that can be subsequently shot from the calculated shootable time and frame rate.
By doing so, even if the communication between the timekeeping information source devices 2 and 4 and the photographing device 3 is interrupted, it is possible to continue shooting up to the number of sheets that can be photographed.

[Example 5-2]
In response to the problem that shooting had to be stopped when communication was interrupted, which was mentioned in Example 5-1 above, in Example 5-1 above, the number of shots that could be taken was calculated, and the number of shots that could be calculated was calculated. Although the shooting is continued until it becomes possible, it may be determined whether or not to continue the shooting from the required number of shots (remaining number of shots) and the accuracy of the oscillators of the irradiation device 1 and the shooting device 3. ..
Specifically, the same parameters as in Example 5-1 are stored in the storage unit 35.
Further, the shooting control unit 31 (having a function of calculating the number of possible shots) of Example 5-1 is provided with a function of comparing the calculated number of possible shots with the remaining number of shots that need to be shot after that.
Further, the shooting control unit 31 is notified that shooting is continued when the number of possible shots is equal to or greater than the remaining number of shots, and that shooting is not possible until the end when the number of possible shots is less than the remaining number of shots. It also has a function to output such as notifying that shooting is not permitted or stopping shooting.
By doing so, even if the communication between the timekeeping information source devices 2 and 4 and the photographing device 3 is interrupted, the photographing can be continued if the preset number of sheets can be taken. ..

When continuing the shooting, the user may be notified that the shooting is continued because the connection is disconnected but the shooting can be continued until the end.
Further, when shooting is continued after the communication is interrupted, specific information (flag or the like) may be associated with the image data of the image taken during the communication interruption period.

[Example 5-3]
In Example 5-1 above, the number of images that can be photographed may be calculated in consideration of the temperature, that is, the temperature may be used as a factor that affects the accuracy of the vibration cycle of the oscillator.
Specifically, the storage unit 35 stores in advance the relationship between the temperature and the vibration cycle of the oscillators of the irradiation device 1 and the photographing device 3, as shown in FIG. 45 (a), for example. The solid line in the figure is a theoretical value, and the upper and lower broken lines are the upper limit value and the lower limit value in consideration of accuracy.
Further, the difference (deviation amount) between the first timekeeping information of the timekeeping information source devices 2 and 4 and the second timekeeping information of the shooting side timekeeping unit 37 immediately after the connection to the photographing control unit 31 is interrupted, and immediately after the connection is disconnected. First, it is provided with a function of predicting a change in the amount of deviation based on the relationship between the timing speed of the time measuring unit 37 on the photographing side and the factor stored in the imaging control unit 31 and the accuracy.
Other functions of the photographing control unit 31 are the same as those of the above-mentioned Example 5-1.

Since the temperature of the oscillator has a greater effect on the accuracy of the oscillation cycle of the oscillator than other factors,
By doing so, as shown in FIG. 45 (b), it is possible to predict the change in the amount of deviation with higher accuracy, and by extension, the number of shots that can be taken can be calculated with higher accuracy.
As in the above-mentioned Example 5-2, it may be determined whether or not the shooting can be performed to the end, and if the shooting can be performed, the shooting may be continued, and if the shooting cannot be performed, the shooting may be interrupted.

[Example 6-1]
In the above embodiment, once synchronization is performed, synchronization may not be performed.
Specifically, the photographing control unit 31 is provided with a function of synchronizing the time when transmitting the first timekeeping information immediately after the exposure switch is pressed.
Further, the imaging control unit 31 is provided with a function of preventing the timing information of the imaging side timing unit 37 from being updated while the exposure switch is pressed after the synchronization is confirmed.
By doing so, the operation timing of the photographing apparatus 3 does not fluctuate during the photographing period, so that the photographing can be performed stably.

Whether or not the time synchronization is normally performed by measuring the difference between the first timekeeping information and the second timekeeping information to the photographing control unit 31 at the time of transmitting the next first timekeeping information after the time synchronization. Alternatively, it may be confirmed whether or not the amount of deviation after time synchronization is within a predetermined value.
By doing so, it is possible to prevent the subject S from being unnecessarily exposed to radiation by erroneously taking a picture in a state where the synchronization is not actually achieved.

[Example 6-2]
In the above embodiment, when synchronization is performed irregularly, there is a problem that the captured image is affected by the fluctuation of the operation timing of the irradiation device 1 or the photographing device 3 and causes a misdiagnosis. ..
In view of such a problem, in the above embodiment, as shown in FIG. 46, synchronization may be performed during the shooting period according to the shooting cycle (for each shooting of each frame).
By doing so, since synchronization is performed at the same timing in the shooting of each frame, it is possible to prevent the influence of synchronizing the operation timing only for a specific frame image.
The influence of the image due to the fluctuation of the operation timing is particularly likely to appear remarkably when the difference in the feature amount between the adjacent frame images is used for the analysis. It can also prevent the analysis from being affected.

The first timekeeping information transmission cycle of the timekeeping information source devices 2 and 4 may be the same as the shooting cycle, or may be set to an integral fraction of the shooting cycle.
Further, in such a case, the transmission timing of the first timekeeping information and the synchronization timing may be shifted by a predetermined phase.

[Example 6-3]
In response to the problem mentioned in Example 5-1 that the captured image is affected when synchronization is performed irregularly, the above-mentioned Example 5-1 synchronizes each frame. However, for example, as shown in FIG. 47, synchronization may be performed every several tens of frames.
By doing so, it is possible to reduce the influence on the frame image even when performing serial shooting for a long time.

In this case, it is preferable to synchronize at a timing during the shooting period in which the image is less likely to be affected.
For example, when performing serial imaging of the lung field, the timing of inspiration or exhaust (when the movement of the lungs is small), not the timing of inspiration or exhaust (when the movement of the lungs is large), which is of interest in diagnosis, etc. Try to synchronize.
By doing so, it is possible to prevent the influence of the fluctuation of the operation timing on the image taken at the timing of interest in the diagnosis.

[Example 6-4]
In response to the problem mentioned in Example 5-1 that the captured image is affected when synchronization is performed irregularly, the above-mentioned Example 5-1 synchronizes each frame. However, for example, as shown in FIG. 48, synchronization may be performed every time several frames are photographed.
When synchronization is performed for each frame as in Example 6-1 above, the processing may take a long time and the processing may not be completed within the shooting time of the frame, which may affect the next frame. On the other hand, if synchronization is performed every several tens of frames as in the above-mentioned Example 6-2, the deviation of the operation timing may become too large. However, by doing so, since synchronization can be performed at appropriate intervals, it is possible to eliminate the influence of the synchronization process on the next frame, and it is possible to reduce the amount of change in the timing when synchronizing, and the captured image can be taken. The effect on can be reduced.

In addition, after performing the process of changing the timekeeping information of the timekeeping section in a certain frame, the process related to this may be performed in the next frame or later.
By doing so, the timekeeping information can be updated and other processing can be distributed to a plurality of frames, and the timekeeping information can be reliably updated at a predetermined timing even when the load is applied by the other processing. It can be carried out.

[Example 6-5]
In response to the problem mentioned in Example 5-1 that the captured image is affected when synchronization is performed irregularly, the above-mentioned Example 5-1 synchronizes each frame. However, for example, as shown in FIG. 49, synchronization may be performed at a cycle shorter than the shooting cycle (synchronization is performed multiple times during the shooting of one frame).
By doing so, the amount of change in timing at the time of synchronization can be reduced, and the influence on the captured image can be reduced.

Although not shown, synchronization may not be achieved at the timing of a specific sequence in the shooting of one frame.
The specific sequence refers to, for example, the accumulation of electric charges by the photographing apparatus 3, the reading / transferring of image data, and the initialization.
Since such a specific sequence is easily affected by the synchronization process, it is possible to reduce the influence on the captured image by doing so. Specifically, it is possible to reduce the effect on the image contrast of each shooting frame by not synchronizing at the accumulation timing, and noise by not synchronizing at the read / transfer timing. The effect of can be reduced.

[Example 6-6]
In the above embodiment, since the images taken may be affected by synchronization, it is not desired to perform the synchronization process as long as the deviation of the operation is within the allowable range depending on the shooting technique and the image analysis method. There is a request.
In view of such a problem, in the above embodiment, as shown in FIG. 50, the difference (deviation amount) between the first timekeeping information of the timekeeping information source devices 2 and 4 and the second timekeeping information of the photographing side timekeeping unit 37. ) May be measured periodically and synchronized only when the deviation amount exceeds the threshold value.
By doing so, it is possible to minimize the synchronization operation and reduce the risk of affecting the captured image.

Even if the deviation amount exceeds the threshold value, synchronization may not be performed immediately while the specific sequence is being performed, but synchronization may be performed after waiting for the end of the specific sequence.
The specific sequence refers to, for example, the accumulation of electric charges by the photographing apparatus 3, the reading / transferring of image data, and the initialization.
Since synchronization may affect the image during the execution of a specific sequence, it is possible to minimize the effect on the captured image by doing so.

In addition, information indicating that the synchronization process has been performed may be associated with the frame image taken at the synchronization timing and saved.
By doing so, it becomes possible to confirm at which frame the synchronization processing was performed later. When the synchronization process affects the image, it is possible to determine later whether the effect appearing on the image is due to the synchronization process or the diagnosis target by specifying the frame later. It will be possible.

[Example 7-1]
In the above embodiment, when the operations of the irradiation device 1 and the photographing device 3 are deviated from each other, there is a problem that the image quality of the image is affected depending on which device's operation is used as the reference for synchronization. ..
In view of such a problem, in the above embodiment, when the deviation of the operation is detected, the operation of the irradiation device 1 may be adjusted to the photographing device 3.
Specifically, as shown in FIG. 51, the irradiation timing of the earlier radiation is delayed, and conversely, the irradiation timing of the delayed radiation is advanced.
When the operation of the photographing device 3 is modified, the contrast between the frame images is likely to be affected, but by doing so, it is possible to prevent the contrast from being affected.

As in the case of the above-mentioned Example 6-6, the frame image taken at the synchronization timing may be associated with the information indicating that the synchronization processing has been performed and saved.
By doing so, it becomes possible to confirm at which frame the synchronization processing was performed later. When the synchronization process affects the image, it is possible to determine later whether the effect appearing on the image is due to the synchronization process or the diagnosis target by specifying the frame later. It will be possible.

[Example 7-2]
To solve the problem that the image quality of photography is affected by the operation of the irradiation device 1 or the image pickup device 3 as a reference for synchronization, which was mentioned in Example 7-1. In 7-1, the operation of the irradiation device 1 is modified with reference to the photographing device 3, but when the deviation of the operation is detected, the operation of the photographing device 3 may be adjusted to the irradiation device 1.
Specifically, as shown in FIG. 52, the delayed accumulation timing is advanced by shortening the initialization timing, and conversely, the earlier accumulation timing is delayed by lengthening the initialization timing.

Even when it becomes necessary to synchronize, the synchronization may not be performed immediately while the specific sequence is being performed, but may be performed after the specific sequence is completed.
The specific sequence refers to, for example, the accumulation of electric charges by the photographing apparatus 3, the reading / transferring of image data, and the initialization.
Since synchronization may affect the image during the execution of a specific sequence, it is possible to minimize the effect on the captured image by doing so.

Further, similarly to the above-mentioned Example 7-1, the frame image taken at the synchronization timing may be associated with the information indicating that the synchronization processing has been performed and stored.
By doing so, it is possible to confirm at which frame the synchronization processing was performed later. When the synchronization process affects the image, it is possible to determine later whether the effect appearing on the image is due to the synchronization process or the diagnosis target by specifying the frame later. It will be possible.

[Example 7-3]
To solve the problem that the image quality of photography is affected by the operation of the irradiation device 1 or the image pickup device 3 as a reference for synchronization, which was mentioned in Example 7-1. In 7-1, the operation of the irradiation device 1 was corrected with reference to the photographing device 3, but as shown in FIG. 53, when the deviation of the operation was detected, the operation of both the irradiation device 1 and the photographing device 3 was corrected. You may try to do it.
If the image is affected differently when the operation of the irradiation device 1 is modified and when the operation of the photographing device 3 is modified, it is difficult to eliminate the effect on the image by modifying only one of them. However, in this way, the operation of the irradiation device and the operation of the photographing device can be modified little by little, so that the influence on each image can be reduced.

The operation of both the irradiation device 1 and the radiation detector side may be modified based on the first timekeeping information of the timekeeping information source devices 2 and 4.
By doing so, the timekeeping information source devices 2 and 4 connected to the irradiation device 1 and the photographing device 3 can be used as a reference, and synchronization can be stably achieved.
Further, the timekeeping information source devices 2 and 4 can perform time synchronization in cooperation with other external timekeeping units by communicating with an external network using a communication standard such as IEEE1588. Therefore, more accurate timekeeping information can be used as a reference.
Further, the irradiation device 1 and the photographing device 3 generate heat due to their operation, and may affect the oscillator or the like that serves as a reference for the built-in time measuring unit. However, in this way, the timekeeping information source devices 2 and 4 can be installed at a place away from the irradiation device 1 and the photographing device 3, and are not easily affected by the heat from them, so that they are stable. It will be possible to provide a count.

Further, the configuration may be such that it is possible to switch whether to modify the operation of the irradiation device 1, the operation of the imaging device 3, or both, depending on the imaging content and the imaging technique. By doing so, by selecting a synchronization method according to the shooting method and the shooting technique, it is possible to keep the influence on the image within a permissible range that differs depending on the shooting method and the shooting technique.
Further, when both are modified, the ratio of both modifications may be changed. For example, in blood flow analysis, it is important to suppress contrast fluctuations between adjacent frame images. Therefore, by doing so, it is possible to make corrections such that the ratio of the correction amount on the irradiation device 1 side is larger than the correction amount on the imaging device 3 side so as to suppress the contrast fluctuation.

[Example 7-4]
To solve the problem that the image quality of an image is affected by the operation of the irradiation device 1 or the image pickup device 3 as a reference for synchronization, which was mentioned in the above embodiment 7-1. In 7-1 to 7-3, the operation of at least one of the irradiation device 1 and the photographing device 3 was corrected, but even so, if synchronization is performed while performing a specific sequence, the image is still affected. There was something.
In view of such a problem, in the above embodiment, synchronization may not be performed at the timing of a specific sequence in the shooting of one frame.
The specific sequence refers to, for example, the accumulation of electric charges by the photographing apparatus 3, the reading / transferring of image data, and the initialization.
Since synchronization may affect the image during the execution of a specific sequence, it is possible to minimize the effect on the captured image by doing so.

[Example 8-1]
In the above embodiment, when the imaging device 3C independently generates the reading start time from the imaging sequence start time and the frame rate, and the control device 12 also independently generates the exposure start time, the imaging device 3C If the frame rate switching timing differs between the control device 12 and the control device 12, shooting will fail. For example, when the frame rate information is transmitted from the control device 12 to the photographing device 3C, it is conceivable that the frame rate switching timing on the photographing device 3C side is delayed due to a communication delay due to packet loss or the like.

In view of such a problem, in the above embodiment, the frame number common to the control device 12 and the photographing device 3C is counted, and the control device 12 (may be the photographing device 3C) receives the frame rate change instruction. At that time, the rate switching frame number and the frame rate may be transmitted to the photographing apparatus 3C.
The rate switching frame number can avoid the influence of the communication delay by adding a number larger than "expected communication delay ÷ frame cycle +1" to the current frame number.
When the control device 12A and the photographing device 3C reach the rate switching frame number, the frame rate is switched.
By doing so, it is possible to prevent the frame rate switching timing from being delayed.

The rate switching time may be notified instead of the rate switching frame number. However, if the rate switching time is close to the turning point of the frame, the switching timing may not match depending on the synchronization accuracy of the timekeeping part, so do not set it to the turning point ± α of the rate switching time frame. Also, set α to a value larger than the assumed synchronization accuracy at the time of shooting.

[Example 8-2]
When the reading start time is independently generated by the photographing device 3C and the exposure start time is generated by the control device 12 described in the above-mentioned Example 8-1, the frame on the photographing device 3C side due to the communication delay. In response to the problem that the rate switching timing is delayed, in the above-mentioned Example 8-1, the frame numbers common to the control device 12 and the photographing device 3C are counted, and the control device 12 receives the frame rate change instruction. At that time, the rate switching frame number and the frame rate were transmitted to the photographing device 3C, but the photographing device 3C was made to read at the fastest frame rate, and the control device 12 was read by the photographing device 3C a predetermined number of times. It is also possible to realize shooting at a desired frame rate by performing exposure each time.
For example, when it is desired to shoot 7.5 fps with a system having a maximum frame rate of 15 fps, the shooting device 3C is made to read an image at 15 fps, and the control device 12 is made to read an image every time the shooting device 3C reads two frames. Have one exposure.

By doing so, a method of independently generating the read start time by the imaging device and independently generating the exposure start time by the radiation control device can be used, so that the minimum is possible between the imaging device 3C and the control device 12A. The only information to be shared is the shooting sequence start time and frame rate, and due to communication delays and packet losses between the shooting device 3C and the control device 12A, the reading start time information arrives after the timing when reading should originally start. It is possible to reduce the risk of shooting failure due to the arrival of exposure start time information after the timing when the exposure should be started.
Further, in this way, when the frame rate is switched, it is not essential to exchange the frame rate switching information between the control device 12 and the photographing device 12A as in the above-described 8-1 embodiment, so that the frame rate is not essential. Can be switched instantly. This allows the user to select the required frame rate at the required timing, improving usability.

[Example 8-3]
In the above-mentioned Example 8-2, since the photographing apparatus 3C has the fastest frame rate and the exposure is performed every several frames read by the photographing apparatus 3C, the frame image generated by the photographing apparatus 3C is not exposed. Images (hereinafter referred to as white images) are mixed. Further, there is a problem that the dynamic image mixed with the white image has poor visibility.
In view of such a problem, the white image may be excluded in the above-mentioned Example 8-2.
Specifically, the average or maximum value of the signal values of the pixels in a predetermined area (including the entire area) in the frame is compared with the predetermined threshold value for each frame, and if it is equal to or less than the threshold value, it is determined as a white image. To do so. Then, when it is determined that the image is a white image, the frame is deleted, or white image attribute information is added to the frame so that the frame image with the attribute is not displayed when the frame image is displayed.
It should be noted that these processes may be performed by the photographing device 3C or the console 14, but if the photographing device 3C is used, the amount of data transmitted from the photographing device 3C to the console 14 can be reduced. Therefore, it is possible to reduce the delay between shooting and displaying the frame image on the console 14.

[Example 8-4]
In the above-mentioned Example 8-3, the signal of the pixel of the frame image is different from the problem that the white image is mixed in the generated frame image in the above-mentioned Example 8-2. Although the frame determined to be a white image is excluded based on the value, the frame determined to be a white image may be excluded based on the frame number.

Specifically, according to a common rule between the control device 12 and the photographing device 3C, a unique frame number (for example, a serial number) is assigned to each frame in a series of photographing.
Further, the control device 12 is provided with a function of associating the frame number with information indicating the presence or absence of exposure, storing it as exposure frame information, and transmitting the exposure frame number to the photographing device 3C or the console 14.
Then, the timer time of each frame (for example, the exposure start time, the end time, any time within one frame, etc.) is stored in the photographing device 3C or the console 14, and the received exposure frame number is referred to. , It has a function to delete the frame image read out without exposure or to hide the frame image.

The control device 12 is provided with a function of storing the timer time for exposed frames or non-exposed frames as information indicating the presence or absence of exposure of each frame and transmitting the timer time to the photographing device 3C or the console 14. The shooting device 3C or the console 14 has a function to save the timer time of each frame, compare it with the received information, delete the frame image read out without exposure, or hide the frame image. You may have it.
By doing so, since it is not necessary to determine the white image from the image, the processing on the photographing device or the console can be lightened, and thereby the delay from the photographing to the display of the frame image on the console can be shortened.

[Example 8-5]
In the above embodiment, there is a request that after the imaging is started by pressing the exposure switch, the exposure and the reading associated with the exposure can be performed at an arbitrary timing.
The arbitrary timing is, for example, the timing when the tube 13 reaches a predetermined position (may be a plurality of locations) when taking a picture while changing the position of the tube 13, and an announcement to urge the subject S to perform a breathing motion. At that time, the timing at which a predetermined announcement is made (may be a plurality of times), the timing at which the body of the subject S becomes a predetermined position when taking a picture while changing the position of the subject S, and the like.

In view of such a problem, in the above embodiment, after reaching an arbitrary timing, the control device 12 determines the exposure start time and the read start time, and the irradiation line control device 12A determines the read start time to the photographing device 3C. After notifying, the control device 12 starts the exposure when the time measuring information of the time measuring unit reaches the exposure start time, and the photographing device starts reading when the time measuring information of the time measuring unit reaches the reading start time. You may do so.
The exposure start time and the read start time are determined based on the assumed radio communication delay.
The read start time is described in the synchronous timekeeping information when the arbitrary timing is reached as "the time from the current time until the photographing device can receive and read the read start time (determined in consideration of the assumed radio notification delay)". And "time required to prepare for the start of exposure of the control device 12 + exposure time of 1 frame", whichever is larger, is added.
The exposure start time is set to a time equal to or more than the "exposure time of one frame" from the read start time.

By doing so, it is possible to avoid a situation in which the photographing apparatus 3C has already passed the reading start time at the time of receiving the reading start time, so that it is possible to prevent the photographing from failing.
The imaging device 3C may determine the exposure start time and the read start time instead of the control device 12A.

[Example 8-6]
In the above-mentioned Example 8-5, the problem of wanting to be able to perform the exposure and the reading associated with it at an arbitrary timing after starting the imaging by pressing the exposure switch, which was mentioned in the above-mentioned Example 8-5, is solved in the above-mentioned Example 8-5. After reaching an arbitrary timing, the control device 12 determines the exposure start time and the read start time, but the photographing device 3C and the control device 12 always shoot at the fastest frame rate. The reading start time may be independently generated from the imaging sequence start time and the frame rate, and the control device 12 may also independently generate the exposure start time. Then, the photographing device always reads at the fastest frame rate, and the control device 12 instructs the tube 13 to start the exposure when the latest exposure timing is reached after reaching the arbitrary timing.

In the above-mentioned Example 1-5, when the assumed radio notification delay is large, the time from reaching the arbitrary timing to the start of the exposure becomes long, the exposure cannot be performed at the desired timing, and the shooting fails. There is a possibility, but by doing so, the maximum delay from reaching an arbitrary timing to the start of exposure can be suppressed to the cycle of the fastest frame rate (for example, about 66.6 ms at 15 fps), and shooting due to the delay can be achieved. Can prevent failure.
In this case, a white image is generated, but this problem can be avoided by applying the above-mentioned Examples 8-3 and the like.

[Example 9-1]
Since the above embodiment is an imaging method in which exposure and reading are performed according to each timing information of a plurality of synchronized timing units, when a plurality of frames are continuously photographed, the synchronization accuracy of the timing unit is improved during a series of exposures. If it is lowered, the timing of exposure and reading may not match.

In view of such a problem, in the above embodiment, synchronization may be performed using the timekeeping information only when the shooting sequence is started.
Specifically, the radiation control unit 121 is provided with a function of starting an operation when the timekeeping information of the second irradiation side timekeeping unit 126 reaches the imaging start trigger time, and causing exposure to be performed at a predetermined timing.
Further, the imaging control unit 31 is provided with a function of starting the operation when the timing information of the second imaging side timing unit 39 reaches the imaging start time and reading the information at a predetermined timing.
The timing at which the photographing device 3 executes the reading sequence is predetermined so as to be after the timing at which the control device 12 executes the exposure sequence.

By doing so, as shown in FIG. 54, after the photographing device 3 starts the read sequence control based on the timekeeping information and the control device 12 starts the exposure sequence control based on the timekeeping information, the timekeeping is performed. Exposure and readout are performed without the use of information. Therefore, as shown in FIG. 55, even if an abnormality occurs in the timing information source devices 2 and 4 during the imaging period and the timing information of the second timing units 39 and 126 fluctuates, the control device 12 and the imaging device are used. 3 can continue to operate without being affected by it.

[Example 9-2]
In the above embodiment, the photographing apparatus 3 is provided with a photographing side timing unit 37 and a second photographing side timing unit 39, and the photographing side timing unit 37 is a time measuring information source regardless of the operation mode of the second photographing side timing unit 39. It was designed to synchronize with devices 2 and 4. This is the configuration when using a general WLAN module.
However, by customizing the WLAN module, the timekeeping unit 37 on the shooting side is stopped, and when the second timekeeping unit 39 on the shooting side is in the synchronous mode, the timekeeping information source devices 2 and 4 and the timekeeping unit 39 on the second shooting side are used. You may try to synchronize with.
If the time measuring unit 37 on the photographing side is not provided, the number of time measuring units used is reduced by that amount, so that the scale of the circuit or software can be reduced or simplified.
Here, the case where the photographing device 3 is not provided with the photographing side timing unit 37 has been described, but the control device 12 is not provided with the irradiation side timing unit 125, and the second irradiation side timing unit 126 is clocked. It can also be synchronized with the information source devices 2 and 4.

[Example 9-3]
In the above embodiment, the irradiation sequence start time is determined by receiving the irradiation preparation completion notification signal from the high voltage generation unit 122, but the irradiation preparation completion notification may be determined depending on the specifications and system configuration of the high voltage generation unit 122. Signal transmission requires modification of equipment and wiring, which may increase development costs.
In view of such a problem, in the above embodiment, an alternative trigger other than the irradiation preparation completion notification may be used to determine the imaging sequence start time.
As the alternative trigger, the ones listed in the following (1) to (3) can be considered.
(1) The first stage of the exposure switch was pressed (2) The second stage of the exposure switch was pressed (3) The console 14, the photographing device 3, the control device 12, the exposure switch 15a, etc. Accepting user instructions on the UI

By the way, the time from when the first stage of the exposure switch is pressed to when the second stage is pressed varies depending on the user's operation. Further, after the first stage of the exposure switch is pressed, in order for the high voltage generating unit 122 to complete the irradiation preparation, it is necessary to complete the rotor up of the rotating anode in the tube 13, but the rotor up time Will fluctuate depending on the conditions. Therefore, when the above (1) is used as an alternative trigger, the time from the pressing of the first stage of the irradiation switch to the completion of irradiation preparation cannot be predicted, and the exposure start time and the reading start time are determined. There is a new problem of not being able to do it.
In order to deal with such a problem, it is effective to perform steps 6 to 11 in the above-mentioned serial shooting flow as follows. The flow up to step 5 and after step 12 is the same as described above. In addition, the supplements and the like described in the above description will be omitted.

(Procedure 6)
When the control device 12 detects the pressing of the first stage of the exposure switch (receives the shooting start signal), the control device 12 transmits a command to that effect to the shooting device 3.
(Procedure 7)
Upon receiving the command, the photographing device 3 transitions to a state in which photography is possible.
After that, the photographing device 3 and the control device 12 wait for the second timekeeping units 39 and 126 to update the respective second timekeeping information to the first timekeeping information of the timekeeping information source devices 2 and 4.
When the update of the timekeeping information of the second timekeeping units 39 and 126 is completed, the photographing device 3 adds the photographing sequence start waiting time stored in the storage unit 35 to the timed information of the second time counting unit 39 at the time of completion. The sequence start time is calculated, stored in the storage unit 35, and transmitted to the control device 12.
In the above, the imaging device 3 is configured to transmit the imaging sequence start time to the control device 12, but the control device 12 is stored in the storage unit 123 in the timing information of the second timing unit 126 when both updates are completed. The imaging sequence start time may be calculated by adding the imaging sequence start waiting time, stored in the storage unit 126, and transmitted to the imaging device 3.

(Procedure 8)
The photographing device 3 and the control device 12 continuously determine whether or not synchronization is achieved even after the synchronization with each other is completed.
Further, the photographing device 3 and the control device 12 are the last of serial imaging from the time when the synchronization of the photographing device 3 and the control device 12 is completed after the irradiation preparation completion notification signal is transmitted from the high voltage generation unit 122 to the control unit 121. When it is detected that synchronization has failed in the period until the start of reading the frame, the second timing units 39 and 126 are operated in the self-propelled mode for at least the period from that point to the start of reading the last frame of the serial shooting. After that, it returns to the synchronous mode. If it is detected that synchronization has failed, the second timekeeping unit 39 can be switched to the self-propelled mode before updating the timekeeping information of the second timekeeping units 39 and 126 to the timekeeping information of the timekeeping units 37 and 125. , 126 can be prevented from being set to an abnormal value.

(Procedure 9)
Further, when the control device 12 receives the shooting sequence start time from the shooting device 3, the control device 12 stores it in the storage unit 123. Then, the exposure start time of each frame is generated based on the stored shooting sequence start time and frame rate (15 fps or the like).
As a specific method for generating the exposure start time, for example, the shooting sequence start time is set as the exposure start time of the first frame, and the shooting cycle (= 1 / frame rate) is cumulatively added to the second and subsequent frames. In this case, the exposure start time of the Nth frame = the shooting sequence start time + (frame number N-1) × the shooting cycle.

(Procedure 10)
Further, the control unit 121 transmits a signal instructing the high voltage generation unit 122 to start the exposure of each frame each time the time measurement information of the second irradiation side time measurement unit 126 matches the exposure start time of each frame. ..
The high voltage generation unit 122 controls to irradiate the tube 13 with radiation R for a preset irradiation time each time the signal for instructing the start of irradiation is received, if the tube 13 can be exposed. conduct. That is, the control device 12 irradiates the radiation R from the tube 13 when the timekeeping information of the second irradiation side timekeeping unit 126 reaches the first predetermined value.

(Procedure 11)
Further, the control unit 121 notifies, for example, that the first stage of the exposure switch 15a is released, the number of shooting frames reaches the maximum number of frames stored in the storage unit 123, and the high voltage generation unit 122 stops. When a shooting end event such as receiving or receiving a stop notification from the shooting device 3 is detected, a command notifying the end of shooting is transmitted to the shooting device 3 via the communication unit 124, and new exposure is emitted in the shooting. Do not send the start instruction to the high voltage generator 122. That is, the shooting is finished.

Further, after the second stage of the exposure switch is pressed, in order to complete the irradiation preparation of the high voltage generating unit 122, it is necessary to complete the rotor up of the rotating anode in the tube 13, but the rotor up time Also fluctuates depending on the conditions. Therefore, when the above (2) is used as an alternative trigger, it is necessary to set the maximum value of the time required for rotor up as the time from the pressing of the second stage of the exposure switch to the completion of irradiation preparation, and the user needs to set the maximum value. Since there is a relatively long wait from the time the second stage of the exposure switch is pressed until the start of shooting, a new problem arises in which shooting cannot be started at the intended timing (for example, at the time of maximum intake). Will end up.
To deal with this problem, replace "the first stage of the exposure switch" with "the second stage of the exposure switch" in the explanation of the flow of serial photography when the above (1) is used as an alternative trigger. All you have to do is take a serial shot.

Further, when the above (3) is used as an alternative trigger, when neither the first stage nor the second stage of the exposure switch goes through the control device 12 (when the exposure switch is directly connected to the tube 13). , Console 14, shooting device 3, control device 12, or exposure switch, etc., the user will instruct to start shooting, but as in the case where the above (1) is used as an alternative trigger, irradiation is performed from the user operation. There is a problem that the time until the preparation is completed cannot be predicted, and the exposure start time and the read start time cannot be determined.
In order to deal with this problem, "pressing the first stage of the exposure switch" in the explanation of the flow of serial photography when the above (1) is used as a trigger is changed to "console 14, imaging device 3, control device 12 or exposure". Serial shooting may be performed in the flow of replacing with "user's instruction by UI such as shooting switch 15a".

[Example 9-4]
In the above-mentioned Example 9-3, there is a problem that a white image is generated until the high voltage generating portion 122 and the tube 13 are in a state where they can be exposed. This problem can be avoided by applying.

[Example 9-5]
In the above-mentioned Example 9-3, the problem that a white image is generated until the high voltage generating portion 122 and the tube 13 are in a state where they can be exposed, which was mentioned in the above-mentioned Example 9-3, is solved. , The presence or absence of a white image was determined from the pixels of the frame image, but when the control unit 121 can obtain information indicating that exposure is in progress from the high voltage generation unit 122, the white image is determined based on that information. You may do so.
Specifically, after the radiography sequence start time is reached, the radiation control unit 121 stores the timekeeping information of the second timekeeping unit 126 at the time when the exposure is first indicated in the storage unit 126, and the console 14 or the imaging device. Have a function to send to 3.
Further, the imaging control unit 31 compares the read start time of each frame stored in the storage unit 35 with the timekeeping information at the time when the irradiation is first indicated to be received, and the frame not exposed to the image. It has a function to delete an image or not to display it when displaying a frame image.
By doing so, it is not necessary to determine the white image from the pixels of the image, so that the processing on the photographing device 3 or the console 14 can be lightened. Further, this makes it possible to reduce the delay between the time when the image is taken and the time when the frame image is displayed on the console 14.

[Example 9-6]
In the above-mentioned Example 9-3, the problem that a white image is generated until the high voltage generating portion 122 and the tube 13 are in a state where they can be exposed, which was mentioned in the above-mentioned Example 9-3, is solved. However, the presence or absence of a white image was determined from the pixels of the frame image, but the imaging device 3 was provided with a radiation sensor capable of measuring the radiation amount, and the measured value of the radiation sensor was predetermined after the imaging sequence start time was reached. When the threshold value is exceeded, it is considered that the shooting of the first frame has started, and the frames before that may be deleted or not displayed at the time of display.
By doing so, it is not necessary to determine the white image from the pixels of the image, so that the processing on the photographing device 3 or the console 14 can be lightened. Further, this makes it possible to reduce the delay between the time when the image is taken and the time when the frame image is displayed on the console 14.

[Example 9-7]
In Examples 9-6, when the radiation detection accuracy of the radiation sensor satisfies the minimum cumulative dose per frame, the measured value of the radiation sensor is read out for each frame, compared with the threshold value, and the sensor value is further initialized. You may prepare for the next frame.
If the radiation detection accuracy of the radiation sensor is lower than the minimum cumulative dose per frame, the measured value is not initialized for each frame, and the cumulative value obtained by accumulating the doses of multiple frames is compared with the threshold value to obtain the threshold value. If it exceeds, it should be considered that the exposure has started. By doing so, it is possible to use an inexpensive radiation sensor having low radiation detection performance.

[Example 9-8]
In the configuration described in Example 9-7 above in which the cumulative value of the doses of a plurality of frames is compared with the threshold value, it takes a long time from the first stage of the exposure switch to the second stage of the exposure switch. In this case, the radiation sensor may not be initialized for a long time, noise may be accumulated, and it may be erroneously determined that the threshold value has been exceeded.
As a countermeasure for this problem, initialization may be performed every time a predetermined time or the number of frames elapses.

[Example 9-9]
In the above embodiment, serial imaging in which the number of exposure frames and the number of read frames are equal is performed, but some imaging systems require a frame that is not exposed (only read) before the first exposure frame. There is also something like that. For example, in order to obtain a frame image that is not exposed for the purpose of stabilizing the temperature inside the photographing device or using it for image processing, only reading is performed without exposing for a predetermined number of frames (or more). After that, exposure and reading are performed.
When the above embodiment is applied to an imaging system that requires such a non-exposed frame, if the switching between the non-exposed frame and the exposed frame is not properly controlled, the non-exposed frame is exposed when the non-exposed frame is acquired. There is a possibility that shooting will be performed and the desired image will not be obtained and the shooting will fail.

In order to deal with such a problem, it is effective to change steps 6 to 16 in the above-mentioned serial shooting flow as in steps 6 to 15 below. The flow up to step 5 is the same as that described above. In addition, the supplements and the like described in the above description will be omitted.

(Procedure 6)
When the synchronization between the time measuring unit 37 and the time measuring information source devices 2 and 4 is completed, the photographing device 3 transitions to a state in which photography is possible.
After that, the photographing device 3 and the control device 12 wait for the second timekeeping units 39 and 126 to update the respective second timekeeping information to the first timekeeping information of the timekeeping information source devices 2 and 4.
Here, if the update of the timekeeping information is not completed within a predetermined time, the console 14 or the like is notified that the synchronization has failed, and the display unit or the like (not shown) of the console 14 indicates that the synchronization has failed. Alternatively, a display prompting for troubleshooting such as restarting the timekeeping information source devices 2 and 4 and checking the network settings, or a display prompting for shooting by wire may be displayed. This makes it possible to recover from an abnormality at an early stage.
When the update of the timekeeping information of both the second timekeeping units 39 and 126 is completed, the photographing device 3 adds the photographing sequence start waiting time stored in the storage unit 35 to the timed information of the second time counting unit 39 at the time of completion. The shooting sequence start time is calculated, stored in the storage unit 35, and transmitted to the control device 12.
In the above, the imaging device 3 is configured to transmit the imaging sequence start time to the control device 12, but the control device 12 is stored in the storage unit 123 in the timing information of the second timing unit 126 when both updates are completed. The imaging sequence start time may be calculated by adding the imaging sequence start waiting time, stored in the storage unit 126, and transmitted to the imaging device 3.

(Procedure 7)
The photographing device 3 and the control device 12 continuously determine whether or not synchronization is achieved even after the synchronization with each other is completed.
Further, the photographing device 3 and the control device 12 are synchronized during the period from the time when the synchronization of both the photographing device 3 and the control device 12 which has transitioned to the image capable state is completed to the start of reading the last frame of the serial photographing. When the failure is detected, the second timing units 39 and 126 are operated in the self-propelled mode for at least the period from that point to the start of reading the last frame of the serial shooting, and then returned to the synchronous mode.

(Procedure 8)
Further, the photographing device 3 generates a reading start time of each frame based on the photographing sequence start time, the frame rate, and the accumulation time per frame stored in the storage unit 123.
The accumulation time is set to be longer than the irradiation time per frame in order to avoid being exposed during reading.
(Procedure 9)
Further, when the control device 12 receives the shooting sequence start time from the shooting device 3, the control device 12 stores it in the storage unit 123. Then, the exposure start time of each frame is generated based on the stored shooting sequence start time and frame rate (15 fps or the like).

(Procedure 10)
Further, the photographing device 3 starts reading the electric charge accumulated in the radiation detection unit 32 every time the second photographing side timing unit 39 matches the reading start time of each frame, and generates image data of the frame image. .. Then, when the photographing device 3 completes reading for the number of frames required for warm-up (or when the acquisition of the non-exposed frame image required for image processing is completed), the photographing device 3 notifies the control device 12 of permission for photographing. do. Even after the exposure permission notification, the photographing device 3 starts the charge reading from the radiation detection unit 32 every time the second photographing side timing unit 39 matches the reading start time of each frame, and generates a frame image.

(Procedure 11)
When the control unit 121 of the control device 12 detects the pressing of the second stage of the exposure switch 15a (receives the shooting start signal), the control unit 121 transmits a signal to that effect to the high voltage generation unit 122 to generate a high voltage. The transition to the standby state waits for the completion notification signal to the effect that the irradiation preparation is completed to be returned from the unit 122.
Upon receiving the imaging start signal, the high voltage generation unit 122 starts irradiation preparation. Specifically, the voltage and current to be output to the tube 13 are prepared, and the rotation anode is instructed to start rotating to the tube 13.

(Procedure 12)
Further, the control unit 121 does not instruct the high voltage generation unit 122 to start exposure until both the irradiation preparation completion notification signal from the high voltage generation unit 122 and the exposure permission notification from the photographing device are received. When both are received, after notifying the imaging device of the completion of irradiation preparation by a communication command, each time the timekeeping information of the second irradiation side timekeeping unit 126 matches the exposure start time of each frame, the high voltage generation unit 122 is notified. Sends a signal instructing the start of exposure of the frame.
The high voltage generation unit 122 controls to irradiate the tube 13 with radiation R for a preset irradiation time each time a signal for instructing the start of exposure is received. That is, the control device 12 irradiates the radiation R from the tube 13 when the timekeeping information of the second irradiation side timekeeping unit 126 reaches the first predetermined value.

(Procedure 13)
Further, the control unit 121 notifies, for example, that the second stage of the exposure switch 15a is released, the number of shooting frames reaches the maximum number of frames stored in the storage unit 123, and the high voltage generation unit 122 stops. When a shooting end event such as receiving or receiving a stop notification from the shooting device 3 is detected, a command notifying the end of shooting is transmitted to the shooting device 3 via the communication unit 124, and new exposure is emitted in the shooting. Do not send the start instruction to the high voltage generator 122. That is, the shooting is finished.
As for the maximum number of frames, a fixed value may be stored in the storage unit 123, or the value input by the console 14 may be transmitted to the control device 12 and stored in the storage unit 123.

(Procedure 14)
Further, after receiving the irradiation preparation completion notification signal from the control device 12, the imaging device 3 is stored in the radiation detection unit 32 every time the second imaging side timing unit 39 matches the read start time of each frame. The reading of the charge is started and the image data of the frame image is generated.

(Procedure 15)
Then, when the photographing device 3 detects, for example, a shooting end event such as receiving a command notifying the end of shooting from the control device 12, the number of shooting frames has reached the maximum number of frames stored in the storage unit 35, the shooting end event is concerned. Finish shooting.

[Example 10-1]
In the above embodiment, the control device 12A and the photographing device 3 are wirelessly connected to perform serial photography, but when the connection form of the photographing device 3 is wired, the accuracy of the second photographing side timing unit 39 is performed. It is preferable to switch to a method that is not easily affected by the influence of the decrease and the frequency error of the oscillators of the photographing device 3 and the control device 12.
Specifically, the irradiation line control device 12 generates the exposure start timing and the read start timing of each frame, notifies the imaging device 3 of the read start timing by a dedicated line, and at the exposure start timing of each frame. Instruct the tube 13 to start exposure.
Then, the photographing apparatus 3 starts reading at the reading start timing of each frame.

In addition, the photographing device 3 is provided with a function to detect the connection form, and when the connection with the wired cable is detected, the wired serial photography described here is selected, and when the non-connection with the wired cable is detected, the connection is detected. The serial shooting method described above may be selected.
By doing so, the user's operation is reduced and usability is improved.

[Example 10-2]
In the above embodiment, wireless serial imaging is performed, but the number of frames may be one. By doing so, it is possible to support wireless still image shooting with common control, so that development cost can be suppressed by standardizing control.
On the other hand, when taking a wireless still image, a method that is not easily affected by the decrease in accuracy of the timekeeping section and the frequency error between the oscillators of the imaging device 3 and the control device 12 (for example, SRM imaging with AeroDR or AeroSync imaging). By switching to (etc.), more stable wireless still image shooting can be performed.
Further, if the console 14 is provided with a function of switching the shooting method instructed to the shooting device 3 and the control device 12 depending on whether the selected order is a wireless still image or a wireless serial image, the user's operation is reduced and the user's experience is reduced. The tee improves.

[Example 11-1]
The state of the subject S can be grasped in more detail by displaying the dynamic change of the radiographic image and the dynamic change of the biological information together and analyzing the relationship between the two.
For example, by taking a dynamic image of the chest of the subject S with the pulse oximeter attached to the subject S, information on the arterial oxygen saturation (SpO2) and the pulse rate can be obtained from the pulse oximeter. , Pulmonary ventilation function information can be obtained from the dynamic image. By integrating and analyzing both of these information, it is possible to evaluate changes in respiratory function over time.
However, usually, a device for measuring biological information such as a pulse oximeter and a radiation system are separate devices, and since they are operated by their own oscillators, the timekeeping information is deviated. If each is equipped with an oscillator with a frequency tolerance of ± 100 ppm, the maximum is 720 ms per hour (60 seconds x 60 minutes x ± 0.01% = ± 360 ms, one device is +360 ms, the other device is. -In the case of 360 ms), there is a difference. In this case, if a dynamic image of 30 fps is taken one hour after the time information of both time measuring parts is accurately combined, the difference between the dynamic image and the biological information becomes a maximum of about 22 frames, and the biological function is displayed in frame units. There was a problem that it became unsuitable for analysis.

Nowadays, various devices support the communication function by wireless LAN. Therefore, in the above embodiment, as shown in FIG. 56, the biometric device 6 is connected to the timekeeping information source devices 2 and 4, and the first timekeeping included in the first timekeeping information from the timekeeping information source devices 2 and 4 is included. Based on the information, the imaging system 100 and the biometric device 6 may be synchronized.
Specifically, the photographing system 100 is provided with a function of associating and saving the timer time corresponding to each frame image. For example, the exposure start time, the exposure end time, and the read start time (time stamp) of each frame are linked.
Further, the biometric measuring device 6 is provided with a function of associating and storing the timekeeping information at the time of sampling the biometric information with each sampling value.

In this way, the image data and biometric information of the radiographic image are transmitted to the device that integrates and analyzes and displays the radiographic image and biometric information, and the frame image and the sampling value of the biometric information are associated with each. By simultaneously playing back according to the timekeeping information, it is possible to display the change over time of both information while suppressing the time lag.
In addition to the display, it is also possible to analyze what kind of biological change occurred at the same time by using the timekeeping information of both.

It is possible to connect not only the two devices of the timekeeping information source devices 2 and 4 and the biometric measuring device 6 but also three or more devices.
Further, not only the wireless LAN but also the IEEE1588, NTP, radio clock, etc. may be used for synchronization.
Further, the frequency band of the wireless LAN may be selected. By doing so, for example, when the biometric device 6 (pulse oximeter or the like) to be linked supports only the 2.4 GHz band WLAN, the frequency band of the wireless LAN of the photographing system 100 is set to 2.4 GHz. It can be dealt with by matching.
Further, a list of other devices and frequency bands that may be connected to the photographing system 100 is stored in advance in the console 14 or the like, and the other devices are connected to the console 14 via the timekeeping information source devices 2 and 4. At that time, the frequency bands used by the photographing device 3 and the control device 12 may be changed by referring to the saved list. By doing so, the user does not need to be aware of the frequency band used or perform an operation for switching, and usability is improved.

Further, by using TSF, it is possible to synchronize the equipment with an accuracy of several tens to several hundreds of μs. For example, when a dynamic image is taken at 30 fps, the shooting cycle is 33.3 ms, and the time lag can be suppressed to less than one frame. Therefore, it becomes possible to link the radiation frame image and the biological information sampling value on the time axis in frame units, and it becomes possible to perform display and analysis with higher accuracy.

[Example 11-2]
Since the biometric device and the radiation system, which are usually described in the above-mentioned Example 11-1, are separate devices and are operated by the oscillators of each, the above-mentioned implementation solves the problem that the timekeeping information is deviated. In Example 11-1, it is possible to connect the biometric device to the timekeeping information source devices 2 and 4 and synchronize using the TSF at that time. There are some that cannot read the timekeeping information using TSF.
When such a wireless LAN module is adopted in a biometric device, it is necessary to modify or replace the wireless LAN module or modify the hardware, which requires a lot of development time and cost.

In such a case, it is conceivable to select a synchronization method that can be implemented in more general software such as IEEE1588 and NTP, but if NTP is used for exposure and readout timing control of radiation serial imaging, the time accuracy will be improved. In some cases, shooting failed due to lack.
On the other hand, if different synchronization methods are used, such as NTP for one device and TSF for WLAN for the other device, the definition of the time stamp value will be different, and the time of both results cannot be displayed or analyzed together. There was a problem.

In view of such a problem, in the above embodiment, as shown in FIG. 57, the two synchronization methods may be used in combination.
Specifically, since the photographing system 100 requires highly accurate time management for its own control, synchronization is performed by a highly accurate time synchronization method (such as TSF of WLAN), and the time is obtained as the result of the frame image or the like. When stamping, use the time of the general time synchronization method.
On the other hand, the biometric device 6 (pulse oximeter, etc.), which does not require highly accurate time management for its own control, uses the time of a general time synchronization method when time stamping the result of heartbeat or the like. ..

By doing so, the frame image of the photographing system 100 and the sampling value of the biometric device 6 can be linked on the time axis without modifying the hardware of the external device such as the biometric device 6.

[Example 11-3]
Since the biometric device and the radiation system, which are usually described in the above-mentioned Example 11-1, are separate devices and are operated by the oscillators of each, the above-mentioned implementation solves the problem that the timekeeping information is deviated. In Example 11-1, the biometric device was connected to the timekeeping information source devices 2 and 4.
If the biometric device to be synchronized is not determined in advance, the synchronization method that can be used with the biometric device is not determined, so that there is a problem that the reference time used for the time stamp cannot be determined by the imaging system.

In view of such a problem, in the above embodiment, as shown in FIG. 58, a bridge device 7 for associating a plurality of reference times may be connected in advance.
Each device (biomeasuring device 6 or imaging system) attaches a time stamp to the test result at a reference time that can be used by each device.
The bridge device 7 synchronizes with, for example, TSF, NTP, and IEEE1588, and stores a list of combinations of each reference time (for example, three reference time combinations are added to the list at intervals of 10 msec).
Each modality sends a time-stamped test result to the bridge device, which rewrites the time stamp to any one reference time and sends it to the console.
It should be noted that each modality may send the inspection result to the console, and the console 14 may inquire of the bridge device.

By doing so, even if the biometric measuring device 6 to be linked is not determined in advance, it is possible to construct an imaging system in which the results of a plurality of devices are linked on the time axis.

[Example 12]
In the above embodiment, when the frame rate can be changed, the amount of dark charge in one frame image changes when the frame rate changes. Therefore, the correction table used for image processing is set according to the frame rate. It is necessary to switch and perform correction processing.
By the way, it is desirable that the frame image read by the photographing apparatus 3 can be displayed on the console 14 with as little delay as possible. By doing so, the user can determine the abnormal position of the subject S during the imaging period at an early stage, interrupt and restart the imaging, and reduce the exposure dose.
However, when the frame rate is variable, a configuration is conceivable in which the photographing device 3 reads a correction table according to the frame rate from the storage unit 35 and performs correction processing. In such a configuration, the processing in the photographing device 3 is performed. There is a problem that it takes too much time and the delay in the time until the image is displayed on the console 14 increases.

In view of such a problem, in the above embodiment, in the photographing device 3, information (time stamp) that shows the time between the frame images that are temporally adjacent to each frame image is associated and saved. good.
For example, the read start time (synchronous timekeeping information) of each frame image and the read end time (synchronous timekeeping information) of each frame image are linked to each frame image and saved.
Then, the photographing apparatus 3 does not perform the correction processing according to the frame rate, but attaches only a time stamp to each frame image and transmits it to the console 14.
The console 14 derives a time interval between each frame image based on the received time stamp, and displays the images in the order of each frame image at the derived time interval. The image displayed at this time has not been subjected to image processing, but it is sufficient for determining re-shooting.
After displaying (or in parallel if there is spare capacity in CPU processing performance), a correction table is selected according to the time interval between the guided frame images, and correction processing is performed.

By doing so, the processing in the photographing device 3 is minimized, so that the frame image read by the photographing device 3 can be displayed on the console 14 without delay. Therefore, the user can detect an abnormal position of the subject S during the imaging period at an early stage, interrupt or redo the imaging, and can suppress the exposure dose of the subject S.

Further, in the above embodiments and examples, the case where the timekeeping information source devices 2 and 4 are connected to the control devices 12, 2A and the console 14 has been described as an example, but the present invention is limited to this connection. Instead, only the timekeeping information source devices 2 and 4 and the radiation control devices 12 and 12A may be connected, or only the timekeeping information source devices 2 and 4 and the console 14 may be connected.
Since the irradiation device 1 is a device that irradiates radiation, if the timekeeping information source devices 2 and 4 and the control devices 12 and 12A are directly connected, the timing of radiation irradiation can be controlled more accurately.
On the other hand, since the console 14 is a device that controls the entire shooting system 100, if the timekeeping information source devices 2 and 4 and the console 14 are directly connected, the console 14 can efficiently perform processing such as synchronization confirmation. Can be done.

100,100A Radiation imaging system 1 Irradiation irradiation device 12, 12A Radiation control device 12a Timekeeping control means 121 Radiation control unit 122 High voltage generation unit 123 Storage unit 124 Communication unit 125 Irradiation side Timekeeping unit 126 Second irradiation side Timekeeping unit 127 Display unit 13 Radiation tube 14 Console 15 Operation unit, operation panel 15a Exposure switch 16 Communication module 2 Access point (timekeeping information source device)
21 Communication unit 22 Timer 3,3A, 3B, 3C, 3D Imaging unit 3a Timekeeping control means 3b Operation button 31, 31A Imaging control unit 32 Radiation detection unit 33 Scanning drive unit 34 Reading unit 35 Storage unit 35 Storage unit 36 Communication unit 36a Antenna 36b Connector 37,37A Timekeeping part 38 Battery 39,39A Timekeeping part 39B Memory 39D Timekeeping part 2 Timekeeping information source device 5 Network device 5 Other device 6 Biometric device 7 Bridge device R Radiation S subject

Claims (7)

A reference time device having a first timekeeping means for timekeeping,
The second timekeeping means and the third timekeeping means for timekeeping,
A radiation control device that irradiates radiation from a radiation tube when the time value of the second time measuring means reaches the first predetermined value.
An image of a radiation image based on the charge generated in the radiation detection unit when the radiation detection unit that generates an electric charge by receiving radiation and the time measurement value of the third timekeeping means become the second predetermined value. A reading unit for reading data, and a radiographic imaging apparatus having the same.
The second timekeeping means and the third timekeeping means can set their own operation mode to a synchronization mode that repeatedly synchronizes with the first timekeeping means at a predetermined timing .
At least one of the second timekeeping means and the third timekeeping means
A determination means for determining whether or not a predetermined condition is satisfied, and
It has a means for switching the operation mode to a self-propelled mode in which time is measured at a predetermined timing without repeated synchronization when it is determined that the determination means satisfies a predetermined condition. A radiography system characterized by that. The radiological imaging system according to claim 1, wherein the determination means determines that a predetermined condition is satisfied by detecting a predetermined event during imaging. The second timekeeping means and the third timekeeping means are configured to repeatedly synchronize with the first timekeeping means at a predetermined cycle while operating in the synchronization mode.
The second aspect of the present invention, wherein the determination means determines that the predetermined condition is satisfied when the time from the previous synchronization to the current synchronization exceeds the predetermined cycle during shooting. Radiation imaging system. During shooting, the determination means indicates that the amount of change in the count value of the second timing means and the third timing means including the determination means exceeds a predetermined threshold value at the time of synchronization. The radiography system according to claim 2, wherein it is determined that the predetermined condition is satisfied based on the detection. The radiological imaging according to any one of claims 1 to 4, wherein the switching means switches to the synchronous mode when the imaging is completed in the self-propelled mode. system. The claim, wherein the device having the determination means and the switching means among the radiation control device and the radiation imaging device includes a communication means capable of wirelessly communicating with the reference time device. The radiography system according to any one of 1 to 5. The communication means wirelessly communicates with the reference time device according to the standard of IEEE802.11.
Of the second timekeeping means and the third timekeeping means, the timekeeping means provided in the device having the communication means uses the time synchronization function specified in the standard when operating in the synchronization mode, and the first timekeeping means. The radiography system according to claim 6, wherein the radiography system is synchronized with the means.

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