JP6944268B2 - Radiography equipment, radiography system, control method and program of radiography equipment - Google Patents

Description

The present invention relates to a radiographic apparatus, a radiological imaging system, a control method and a program of the radiological imaging apparatus.

As a radiographic imaging device that captures a radiographic image using radiation (X-rays, etc.) transmitted through a subject, a radiographic imaging device capable of displaying a radiographic image in real time has become widespread. In addition, a flat panel radiographic apparatus (FPD) has been proposed.

Since the FPD detects the amount of radiation emitted during an arbitrary accumulation time as the amount of electric charge, if an electric charge unrelated to the irradiation of radiation is present in the radiation detector when the radiation image of the subject is taken, the electric charge is charged. Is superimposed on the radiation image as noise, which causes deterioration of image quality.

In Patent Document 1, in order to maintain the accuracy of the offset correction processing for removing the offset component due to the noise accumulated during the acquisition of the radiographic image, the stability and the amount of fluctuation of the offset correction data with respect to time are determined, and the offset correction data is obtained. The technology to acquire is proposed. Patent Document 2 proposes a technique for switching the method of acquiring offset correction data depending on whether the image is a moving image or a still image. Patent Document 3 proposes a technique for reducing temperature fluctuations that affect the offset correction process by always performing the same operation even when the frame rates are different.

Japanese Patent No. 4557697 U.S. Pat. No. 7492865 Japanese Unexamined Patent Publication No. 2016-95278

However, although the techniques shown in Patent Documents 1 to 3 disclose methods for acquiring offset correction data for maintaining the accuracy of offset correction processing, no consideration is given to the power supply form. Therefore, even in the case of a limited energy supply source such as power supply from a battery, it is necessary to acquire offset correction data on a regular basis, or power is used for operations other than those required for shooting in order to reduce temperature fluctuations. Is consumed, and the time and number of shots that can be taken are limited. As described above, in the prior art, there is a problem that appropriate offset correction cannot be performed in consideration of the form of power supply to the radiography apparatus, and the convenience of the user is impaired.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a technique for realizing an appropriate offset correction in consideration of a form of power supply to a radiography apparatus.

The radiography apparatus according to the present invention that achieves the above object is
A radiographic apparatus capable of operating in at least one of a plurality of power supply forms including a battery and an external power source.
The power supply control means for determining the power supply form and
A control means for controlling the operation of the radiography apparatus is provided.
The control means acquires, according to the power supply mode, a first acquisition mode for acquiring offset correction data after shooting the subject for each shooting of the subject, and offset correction data acquired in advance before shooting the subject. Switch to the second acquisition mode ,
The control means switches to the first acquisition mode when the power is supplied from the battery, and switches to the second acquisition mode when the power is supplied from the external power source. It is characterized by.

According to the present invention, it is possible to realize an appropriate offset correction in consideration of the form of power supply to the radiography apparatus.

The figure which shows the structural example of the radiography system which concerns on one Embodiment of this invention. The figure which shows the structural example of the radiography apparatus which concerns on one Embodiment of this invention. The flowchart which shows the procedure of the image processing which concerns on 1st Embodiment. The flowchart which shows the operation procedure of the power-source control part which concerns on 2nd Embodiment. The flowchart which shows the procedure of image processing which concerns on 2nd Embodiment. The flowchart which shows the procedure of the image processing which concerns on 3rd Embodiment. The flowchart which shows the procedure of the image processing which concerns on 4th Embodiment.

Hereinafter, embodiments will be described with reference to the drawings. The configuration shown in the following embodiments is only an example, and the present invention is not limited to the illustrated configuration.

(First Embodiment)
<Overview>
In the first embodiment, the first acquisition mode in which the offset correction data is acquired after the subject is photographed and the offset correction data is acquired in advance before the subject is photographed for each image of the subject, depending on the power supply mode to the radiography apparatus. An example of switching between the second acquisition mode for acquiring the offset correction data will be described. More specifically, the first acquisition mode is switched when the power is supplied from the battery, and the second acquisition mode is switched when the power is supplied from the external power source.

<Offset correction>
The radiography apparatus (FPD) is a matrix of minute radiation detectors in which a solid-state photodetector in which an amorphous semiconductor is sandwiched between a transparent conductive film and a conductive film and a scintillator that converts radiation into visible light are laminated on a quartz glass substrate. It is composed by arranging them in a shape. Further, as a solid-state photodetector, a photodetector such as a CCD or CMOS is known. Further, as a radiation detector, one that directly detects radiation with a solid-state photodetector without using a scintillator is known.

The FPD detects the amount of radiation emitted during any accumulation time as the amount of charge. Therefore, if a charge irrelevant to the irradiation of radiation is present in the radiation detector when the radiation image of the subject is taken, this charge is superimposed on the radiation image as noise, which causes deterioration of the image quality of the radiation image.

For example, as a charge that becomes noise, there is a residual charge that remains based on the characteristics of a solid-state photodetector or a scintillator after the radiographic image taken in advance is taken. Further, as the electric charge that becomes noise, there is a dark current due to the electric charge generated in the solid-state photodetector mainly due to the influence of temperature. In addition, fixed noise caused by a defect peculiar to the radiation detector causes deterioration of the image quality of the radiation image.

When a radiation image of a subject is taken, residual charges and charges of dark current components are also accumulated in proportion to the accumulation time of the image to be irradiated with radiation, and the image quality of the radiation image is deteriorated. Therefore, in taking a radiation image of a subject, offset correction processing is performed to remove offset components due to residual charges, dark current charges, fixed noise, and the like accumulated during shooting.

Generally, the offset correction process is performed by using the image data (non-exposure image data) acquired without irradiating radiation as the offset correction data and subtracting the offset correction data from the radiation image.

Further, in the case of a general FPD, the dark current charge tends to become unstable immediately after the start of driving the radiation detector or immediately after the irradiation. Further, it is known that the residual charge generated after irradiation changes rapidly as soon as the irradiation is completed. Therefore, in order to execute stable offset correction processing, a certain period of time is required between the start of driving the radiation detector and the acquisition of the radiation image, or between the acquisition of the preceding radiation image and the acquisition of the next radiation image. It is necessary to secure. On the other hand, in order to improve the operability of the radiography apparatus, it is desired to take a radiological image in a short time immediately after the start of driving or immediately after the preceding radiographic image is taken.

<Configuration of radiography system>
FIG. 1 is a diagram showing an example of a radiography system according to an embodiment of the present invention. In FIG. 1, 1 is a radiographing device, 2 is a control device, 3 is a display device, 4 is an input device, and 5 is a radiation source control device. 6 is the radiation interface unit I / F, 7 is the HUB, 8 is the access point AP, 9 is the radiation source, 10 is the radiation, and 11 is the subject. The radiography system of the first embodiment is configured to include at least a radiography apparatus 1 and a control apparatus 2 among the components shown in FIG.

The radiography apparatus 1 is an apparatus for acquiring radiographic image data of the subject 11 based on the radiation 10 emitted from the radiation source 9 and transmitted through the subject 11, for example, a radiographing apparatus using a flat panel detector (FPD). It can be preferably used. Further, the radiography apparatus 1 can operate in at least one of a plurality of power supply forms including a battery and an external power supply. The radiography apparatus 1 includes a radiation detection module 110, an image processing module 120, a communication module 130, a power supply module 140, and a control module 150. The radiography apparatus 1 is operated by the power supply supplied from the power supply module 140, and the entire apparatus is controlled by the control module 150.

The detection module 110 converts the arriving radiation into an electrical signal. The converted electric signal is digitized and sent to the image processing module 120, subjected to various processing including offset correction, and then sent to the communication module 130. Then, it is transmitted as image data to the external control device 2 via the communication interface. The control device 2 may be connected to a display device 3 such as a display for displaying a control menu or image data after shooting, or an input device 4 such as a mouse or keyboard for performing various inputs.

The control device 2 is a unit for controlling the operation and imaging mode of the radiography system and various controls such as processing of image data taken by the radiography apparatus 1, and is suitable for various computers and workstations. Can be used for. The radiation source 9 is composed of an electron gun and a rotor for generating radiation 10 such as X-rays. X-rays are generated when electrons collide with the rotor while being accelerated by the high voltage generated by the radiation source controller 5.

Communication between the radiographing device 1 and the control device 2 is performed by wireless LAN via the access point (denoted as AP in the figure) 8 in the figure. Further, either the radiography apparatus 1 or the control device 2 may act as an access point for direct communication without going through the access point 8. Alternatively, another wireless communication unit such as Bluetooth (registered trademark) may be used. It is also possible to connect using a wired communication unit such as Ethernet (registered trademark).

A radiation interface unit (denoted as radiation I / F in the figure) 6 is provided between the control device 2 and the radiation control device 5. The radiation interface unit 6 has a circuit that mediates communication performed between the radiation imaging device 1 and the radiation source control device 5, and relays the exchange of synchronization signals and the like. By monitoring the states of the radiation imaging device 1 and the radiation source control device 5, for example, the irradiation timing of the radiation from the radiation source 9 can be adjusted according to the state of the radiation imaging device 1. Furthermore, by connecting to the control device 2, the transmission and reception of various control signals and information is relayed.

The radiation interface unit 6 is connected to the control device 2 via Ethernet (registered trademark) via the HUB 7. HUB7 is a unit for connecting multiple network devices. Furthermore, by connecting the access point 8 to the HUB 7, it is also connected to the radiographing device 1 by wireless LAN.

<Configuration of radiography equipment>
FIG. 2 is a schematic view showing an example of the configuration of the radiography apparatus 1 in the present embodiment. The detection module 110 includes a detector 111, a drive circuit 112, a read circuit 113, and the like. The detector 111 includes a scintillator, a photodetector array, and the like (not shown), is capable of detecting radiation, and generates image data. In the scintillator, the parent material of the phosphor is excited by high-energy radiation transmitted through the subject, and the recombination energy at the time of recombination emits fluorescence in the visible region. This fluorescence is _{due to the mother itself such as CaWO 4} and CdWO _4, and due to the luminescent central substance added to the mother such as CsI: Tl and ZnS: Ag. The photodetector array outputs an electric signal according to the amount of fluorescence (radiation amount incident on the scintillator) detected in each pixel constituting the photodetector array by the operation of the drive circuit 112. The readout circuit 113 amplifies the electric signal output from the photodetector array using an amplifier IC as needed, converts it into a digital signal by an A / D converter, and outputs image data.

The image processing module 120 includes an image processing unit 121, a storage unit 122, and the like. The image processing unit 121 performs image processing such as gain processing and offset correction processing on the image data output from the readout circuit 113. The offset correction processing is performed by subtracting the offset correction data (non-exposure image data) stored in the storage unit 122 from the radiation image based on the control of the control module 150. Further, the image processing unit 121 may perform other basic image processing such as gain correction processing in order to obtain low noise radiation image data. Further, the image processing unit 121 may perform image processing including image quality adjustment required by the user, such as gradation correction.

The storage unit 122 stores image data output from the reading circuit 113 or the image processing unit 121, image data for correction processing of the image processing unit 121 (offset correction data, gain correction data, defect information, etc.) and the like. There are no specific restrictions on the implementation, and it can be implemented in various combinations such as one or more memories, HDDs, volatile memories, and non-volatile memories.

The data processed by the image processing unit 121 is sent to the communication module 130.

The communication module 130 is composed of a wireless communication unit 131, an antenna 132, and the like. The wireless communication unit 131 is a unit for wirelessly transmitting image data or the like processed by the image processing unit 121 to an external control device 2 or the like, and an antenna 133 is connected to the wireless communication unit 131.

The power supply module 140 is composed of an external interface (denoted as an external I / F in the figure) 141, a battery 142, and the like. The control module 150 includes a photographing device control unit 151 and a power supply control unit 152. The imaging device control unit 151 is a unit that performs processing related to the control of each unit of the radiography imaging device 1. For example, an instruction to acquire a radiation image is output to the drive circuit 112, and an instruction to perform predetermined image processing on the acquired radiation image is output to the image processing unit 121. At that time, an instruction is given to switch the offset correction data acquisition mode according to the power supply mode (for example, power supply from the external interface 141 or power supply from the battery 142) transmitted from the power supply control unit 152.

There are a plurality of acquisition modes of offset correction data, for example, there is a first acquisition mode for acquiring offset correction data (non-exposure image data) after shooting a subject. More specifically, in the first acquisition mode, offset correction data is acquired during continuous shooting of a subject. That is, in the first acquisition mode, the acquisition of the radiation image of the subject and the acquisition of the offset correction data are alternately performed. Then, the offset correction process is performed by subtracting the offset correction data from the radiation image.

In addition, there is a second acquisition mode for acquiring offset correction data (non-exposure image data) acquired in advance before shooting the subject. Then, the offset correction process is performed by subtracting the offset correction data from the radiation image.

The photographing device control unit 151 obtains the first acquisition mode for acquiring offset correction data after shooting the subject and the offset correction data acquired in advance before shooting the subject for each shooting of the subject, depending on the power supply mode. Switch to the second acquisition mode to acquire. More specifically, the first acquisition mode is switched when the power is supplied from the battery 142, and the second acquisition mode is switched when the power is supplied from the external interface 141 (external power supply). I do. The reason is as follows.

In the case of power supply from the external interface 141, stable power supply from the outside of the radiography apparatus 1 such as a commercial power supply can be expected, whereas in the case of power supply from the external interface 141, a limited energy supply source The power is supplied from the battery 142.

When offset correction data is acquired and offset correction is performed before taking a radiation image of the subject (second acquisition mode), the frame rate can be increased, so high-speed continuous shooting such as moving image shooting is possible. Become. However, the dark current charge changes depending on the temperature of the radiation detector, the imaging conditions, the deterioration of the sensor over time, and the like. Further, since it is difficult to obtain sufficient accuracy of the offset correction processing due to the influence of shooting conditions such as temperature fluctuation, it is necessary to periodically acquire the offset correction data of all shooting modes. Alternatively, it is necessary to always perform the shooting operation so that the temperature fluctuation is almost eliminated. Therefore, the method of acquiring the offset correction data in advance before shooting the subject is a method of acquiring the offset correction data after shooting the subject for each shooting of the subject, that is, the shooting of the subject and the acquisition of the offset correction data are alternately performed. Power consumption is higher than offset correction.

Therefore, in the case of power supply from the external interface 141, the mode is switched to the second acquisition mode in which the offset correction data is acquired in advance before taking the radiation image of the subject. Then, offset correction is performed using the acquired offset correction data, and it is possible to support shooting at a high frame rate.

On the other hand, in the case of power supply from the battery 142, the capacity of the power supply is limited, so each time the subject is photographed, the mode is switched to the first acquisition mode in which the offset correction data is acquired after the subject is photographed. Then, offset correction is performed using the offset correction data acquired by alternately capturing the radiation image of the subject and acquiring the offset correction data, thereby preventing a reduction in the time and the number of images that can be captured. When the radiographic image of the subject is photographed and the offset correction data is acquired alternately, the frame rate becomes slow, but the afterimage can be reduced.

The power supply control unit 152 is a unit for controlling the operating power supply of the radiography apparatus 1, and receives power from the battery 142 or the external interface 141 to supply various power sources required for the operation of the radiography apparatus 1. Is generated and supplied to each unit. In addition, it detects whether or not the power is supplied from the external interface 141 and transmits it to the photographing device control unit 151. In addition, the remaining capacity of the battery 142 is detected. Further, it may have a function of controlling the charging of the battery 142.

The determination of whether or not the power is supplied from the external interface 141 can be realized by providing the external interface 141 with a detection mechanism for inserting / removing the power supply cable, for example, a detection signal. Alternatively, it can also be realized by detecting a power input of a predetermined voltage value or more on the power line.

The photographing device control unit 151 and the power supply control unit 152 may be realized by using software such as a CPU, or the device may be controlled by a control signal generation circuit by an ASIC or the like. It may also be realized by both a program and a control circuit.

<Processing>
Next, the procedure of image processing including offset correction processing will be described with reference to FIG. FIG. 3 is a flowchart showing an example of the operation of the radiography apparatus according to the present embodiment. In step S301, the user inputs a photographing mode for capturing a radiographic image of the subject from the input device 4, and the radiographic imaging device 1 receives the photographing mode via the control device 2, the HUB 7, and the AP8. In this case, the display device 3 may display the shooting mode in order for the user to select the shooting mode.

In step S302, the power supply control unit 152 detects whether or not the power is supplied from the external interface 141. If the power is supplied from the battery 142 instead of the power supplied from the external interface 141 in step S302, the process proceeds to step S303 and subsequent steps. Then, the offset correction data (non-exposure image data) is acquired after the subject is photographed, and the subject is photographed and the offset correction data is acquired alternately.

In step S303, the radiation source 9 irradiates the radiation photographing device 1 with the radiation 10 transmitted through the subject 11, and the radiation photographing device 1 takes a radiation image of the subject in a predetermined photographing mode. In step S304, the detection module 110 acquires image data (non-exposure image data) taken in the same shooting mode as step S303 received in step S301 as offset correction data corresponding to the shooting mode in step S303. In this case, the detection module 110 acquires unexposed image data in the same imaging mode as the imaging of the radiation image in step S303 as offset correction data.

In step S305, the image processing unit 121 performs the offset correction processing by subtracting the offset correction data from the radiation image. In step S306, the image processing unit 121 outputs the corrected image subjected to the offset correction processing in step S305.

On the other hand, in step S302, when the power is supplied from the external interface 141, the process proceeds to step S307 and subsequent steps, and offset correction is performed using the offset correction data (non-exposure image data) acquired before the subject is photographed. In step S307, the detection module 110 determines whether or not the offset correction data (non-exposure image data) of the shooting mode to be shot in step S309 is stored in the storage unit 122. If the non-exposure image data is not stored, the process proceeds to step S308, and if the non-exposure image data is stored, the process proceeds to step S309.

In step S308, the detection module 110 acquires the image data (non-exposure image data) taken in the shooting mode of step S309 received in step S301 as offset correction data corresponding to the shooting mode in step S309.

As the offset correction data to be acquired, offset correction data may be generated from a plurality of non-exposure image data. For example, a plurality of unexposed image data may be acquired and the average thereof may be used as offset correction data.

In step S309, the radiation source 9 irradiates the radiation photographing apparatus 1 with the radiation 10 transmitted through the subject 11, and the radiation photographing apparatus 1 takes a radiation image of the subject in a predetermined photographing mode, and in steps S305 and S306. move on. After that, the same processing is performed.

As described above, in the present embodiment, the first acquisition mode for acquiring the offset correction data after the subject is photographed and the subject before the subject is photographed, depending on the power supply mode to the radiography apparatus. The second acquisition mode for acquiring the offset correction data acquired in advance is switched to. More specifically, the first acquisition mode is switched when the power is supplied from the battery, and the second acquisition mode is switched when the power is supplied from the external power source.

As a result, it is possible to realize an appropriate offset correction in consideration of the form of power supply to the radiography apparatus. Then, even when operating with a limited energy supply source such as a battery, the optimum offset correction method is selected to maintain both the image quality of the captured image and the time and number of images that can be captured to improve user convenience. be able to.

The above is an example of a typical embodiment of the present invention, but the present invention is not limited to the embodiments shown in the above and the drawings, and can be appropriately modified and implemented without changing the gist thereof. ..

(Second embodiment)
<Overview>
In the first embodiment, the radiography apparatus that switches the offset correction data acquisition mode according to whether the power supply is external power supply or battery power supply has been described.

On the other hand, in the second embodiment, in addition to determining whether or not the power supply is externally supplied, a radiography apparatus that switches the offset correction data acquisition mode according to the operating time of battery-powered will be described. More specifically, when the power is supplied from the battery and the operation by the power supply from the battery elapses for a predetermined time, the first acquisition mode for acquiring the offset correction data after shooting the subject for each shooting of the subject. Switch to. Further, when the power is supplied from the battery and the operation by the power supply from the battery has not elapsed for a predetermined time, the mode is switched to the second acquisition mode in which the offset correction data acquired in advance before shooting the subject is acquired. I do. Hereinafter, since the configuration of the radiography apparatus 1 is the same as that of the first embodiment, the description thereof will be omitted.

<Processing>
A procedure for processing the power supply control unit 152 when the power is turned on will be described with reference to FIG. FIG. 4 is a flowchart showing an example of the operation of the power supply control unit 152 according to the present embodiment. When the power supply is started from the external interface 141 or the battery 142 in step S401, it is determined in step S402 whether or not the power supply is from the external interface 141. If the power is supplied from the battery 142 instead of the power supplied from the external interface 141 in step S402, the process proceeds to step S403, and the counting of the operating time in the power supply from the battery 142 is started in step S403.

In step S404, whether or not the power is supplied from the external interface 141 is transmitted to the photographing device control unit 151. The power control unit 151 periodically returns to step S402 to determine whether or not the power is supplied from the external interface 141 while the radiographing apparatus 1 is operating.

If the power is supplied from the external interface 141 in step S402, the process proceeds to step S404 to notify the photographing device control unit 151 whether or not the power is supplied from the external interface 141. Then, it is determined in step S402 whether or not the power supply is terminated, and if not, the process returns to step S402.

Subsequently, the procedure of image processing including offset correction processing will be described with reference to FIG. FIG. 5 is a flowchart showing an example of the operation of the radiography apparatus according to the present embodiment. In step S501, the user inputs a imaging mode for capturing a radiographic image of the subject from the input device 4, and the radiographic imaging device 1 receives the imaging mode via the control device 2, the HUB 7, and the AP8. In this case, the display device 3 may display the shooting mode in order for the user to select the shooting mode.

In step S502, the power supply control unit 152 detects whether or not the power is supplied from the external interface 141. If the power is supplied from the battery 142 instead of the power supplied from the external interface 141 in step S502, the process proceeds to step S503.

In step S503, the operating time of the power supply from the battery 142 is acquired from the power supply control unit 152, and if a predetermined time or more has elapsed, the process proceeds to step S504 or later. Then, the offset correction data (non-exposure image data) is acquired after the subject is photographed, and the subject is photographed and the offset correction data is acquired alternately.

In step S504, the radiation source 9 irradiates the radiation photographing apparatus 1 with the radiation 10 transmitted through the subject 11, and the radiation photographing apparatus 1 takes a radiation image of the subject in a predetermined photographing mode. In step S505, the detection module 110 acquires image data (non-exposure image data) taken in the same shooting mode as step S504 received in step S501 as offset correction data corresponding to the shooting mode in step S504. In this case, the detection module 110 acquires unexposed image data in the same imaging mode as the imaging of the radiation image in step S504 as offset correction data.

In step S506, the image processing unit 121 performs the offset correction processing by subtracting the offset correction data from the radiation image. In step S507, the image processing unit 121 outputs the corrected image subjected to the offset correction processing in step S506.

On the other hand, in step S502, when the power is supplied from the external interface 141, the process proceeds to step S508 and subsequent steps, and offset correction data (non-exposure image data) is acquired before shooting the subject. Further, in step S503, even if the operating time of the power supply from the battery 142 is less than the predetermined time, the process proceeds to step S508 and subsequent steps in the same manner, and the offset correction data (non-exposure image data) acquired before the subject is photographed. Perform offset correction using.

In step S508, the detection module 110 determines whether or not the offset correction data (non-exposure image data) of the shooting mode to be shot in step S510 is stored in the storage unit 122. If the non-exposure image data is not stored, the process proceeds to step S509, and if the non-exposure image data is stored, the process proceeds to step S510.

In step S509, the detection module 110 acquires the image data (non-exposure image data) taken in the shooting mode of step S510 received in step S501 as offset correction data corresponding to the shooting mode in step S510.

As the offset correction data to be acquired, the offset correction data may be generated from a plurality of non-exposure image data. For example, a plurality of unexposed image data may be acquired and the average thereof may be used as offset correction data.

In step S510, the radiation source 9 irradiates the radiation photographing apparatus 1 with the radiation 10 transmitted through the subject 11, and the radiation photographing apparatus 1 takes a radiation image of the subject in a predetermined photographing mode, and in steps S506 and S507. move on.

As described above, according to the present embodiment, in addition to determining whether the power supply is external power supply or battery power supply, the offset correction data acquisition mode is switched according to the operation time of battery power supply. Therefore, it is possible to realize an appropriate offset correction in consideration of the form of power supply to the radiography apparatus.

More specifically, when the power is supplied from the battery and the operation by the power supply from the battery elapses for a predetermined time, the first acquisition mode for acquiring the offset correction data after shooting the subject for each shooting of the subject. Switch to. This enables long-term operation with reduced battery consumption. Further, when the power is supplied from the battery and the operation by the power supply from the battery has not elapsed for a predetermined time, the mode is switched to the second acquisition mode in which the offset correction data acquired in advance before shooting the subject is acquired. I do. This makes it possible to support high frame rate shooting.

In this way, even when operating with a limited energy supply source such as a battery, by selecting the offset correction processing suitable for high frame rate shooting under limited conditions, the image quality of the shot image and the shooting time can be determined. Both of the number of sheets can be kept. Therefore, it is possible to improve the convenience of the user.

(Third embodiment)
<Overview>
In the second embodiment, in addition to determining whether or not the power supply is externally supplied, a radiography apparatus that switches the offset correction data acquisition mode according to the operating time of battery-powered has been described.

On the other hand, in the third embodiment, in addition to determining whether or not the power supply is external power supply, a radiography apparatus that switches the acquisition mode of offset correction data according to the remaining capacity of the battery will be described. More specifically, when the power supply form is power supply from a battery and the remaining capacity of the battery is a predetermined amount or less, the first method of acquiring offset correction data after shooting the subject for each shooting of the subject. Switch to the acquisition mode. Further, when the power supply mode is power supply from the battery and the remaining capacity of the battery is larger than a predetermined amount, the mode is switched to the second acquisition mode in which the offset correction data acquired in advance before shooting the subject is acquired. I do. Hereinafter, since the configuration of the radiography apparatus 1 is the same as that of the first embodiment, the description thereof will be omitted.

<Processing>
The procedure of image processing including offset correction processing will be described with reference to FIG. FIG. 6 is a flowchart showing an example of the operation of the radiography apparatus according to the present embodiment. In step S601, the user inputs a imaging mode for capturing a radiographic image of the subject from the input device 4, and the radiographic imaging device 1 receives the imaging mode via the control device 2, the HUB 7, and the AP8. In this case, the display device 3 may display the shooting mode in order for the user to select the shooting mode.

In step S602, the power supply control unit 152 determines whether or not the power is supplied from the external interface 141. If the power is supplied from the battery 142 instead of the power supplied from the external interface 141 in step S602, the process proceeds to step S603.

In step S603, the remaining capacity of the battery 142 is acquired from the power supply control unit 152, and if it is equal to or less than a predetermined amount, the process proceeds to step S604 or later. Then, the offset correction data (non-exposure image data) is acquired after the subject is photographed, and the subject is photographed and the offset correction data is acquired alternately.

In step S604, the radiation source 9 irradiates the radiation photographing apparatus 1 with the radiation 10 transmitted through the subject 11, and the radiation photographing apparatus 1 takes a radiation image of the subject in a predetermined photographing mode.

In step S605, the detection module 110 acquires image data (non-exposure image data) taken in the same shooting mode as in step S604 received in step S601 as offset correction data corresponding to the shooting mode in step S604. In this case, the detection module 110 acquires unexposed image data in the same imaging mode as the imaging of the radiation image in step S604 as offset correction data.

In step S606, the image processing unit 121 performs the offset correction processing by subtracting the offset correction data from the radiation image. In step S607, the image processing unit 121 outputs the corrected image to which the offset correction processing has been performed in step S606.

On the other hand, in step S602, when the power is supplied from the external interface 141, the process proceeds to step S608 and subsequent steps, and offset correction data (non-exposure image data) is acquired before shooting the subject. In step S603, even if the remaining capacity of the battery is larger than the predetermined amount, the process proceeds to step S608 and subsequent steps in the same manner, and offset correction is performed using the offset correction data (non-exposure image data) acquired before shooting the subject.

In step S608, the detection module 110 determines whether or not the offset correction data (non-exposure image data) of the shooting mode to be shot in step S610 is stored in the storage unit 122. If the non-exposure image data is not stored, the process proceeds to step S609, and if the non-exposure image data is stored, the process proceeds to step S610.

In step S609, the detection module 110 acquires the image data (non-exposure image data) taken in the shooting mode of step S610 received in step S601 as offset correction data corresponding to the shooting mode in step S610.

As the offset correction data to be acquired, the offset correction data may be generated from a plurality of non-exposure image data. For example, a plurality of unexposed image data may be acquired and the average thereof may be used as offset correction data.

In step S610, the radiation source 9 irradiates the radiation photographing apparatus 1 with the radiation 10 transmitted through the subject 11, and the radiation photographing apparatus 1 takes a radiation image of the subject in a predetermined photographing mode, and in steps S606 and S607. move on.

As described above, according to the present embodiment, in addition to determining whether the power supply is external power supply or battery power supply, the offset correction data acquisition mode is switched according to the remaining battery capacity.

More specifically, when the power supply form is power supply from a battery and the remaining capacity of the battery is a predetermined amount or less, the first method of acquiring offset correction data after shooting the subject for each shooting of the subject. Switch to the acquisition mode. This enables long-term operation with reduced battery consumption. Further, when the power supply mode is power supply from the battery and the remaining capacity of the battery is larger than a predetermined amount, the mode is switched to the second acquisition mode in which the offset correction data acquired in advance before shooting the subject is acquired. I do. This makes it possible to support high frame rate shooting.

In this way, even when operating with a limited energy supply source such as a battery, by selecting the offset correction processing suitable for high frame rate shooting under limited conditions, the image quality of the shot image and the shooting time can be determined. Both of the number of sheets can be kept. Therefore, it is possible to improve the convenience of the user.

(Fourth Embodiment)
<Overview>
In the third embodiment, in addition to determining whether or not the power supply is external power supply, a radiography apparatus that switches the acquisition mode of offset correction data according to the remaining capacity of the battery has been described.

On the other hand, in the fourth embodiment, in addition to determining whether or not the power supply is external power supply, a radiography imaging device that switches the acquisition mode of offset correction data according to the required number of imaging images will be described.

Here, the required number of shots means the number of shots in a shot in which the number of shots is determined in advance. Examples of imaging in which the number of imaging images is determined in advance include imaging in DSA (Digital Subtraction Angiography) in tomosynthesis and angiography.

More specifically, when the power supply form is power supply from a battery and the required number of shots is a predetermined number or more, the offset correction data is acquired after each shot of the subject. Switch to the acquisition mode of 1. Further, when the power supply mode is power supply from the battery and the required number of shots is less than a predetermined number, the second acquisition mode for acquiring the offset correction data acquired in advance before shooting the subject is entered. To switch. Hereinafter, since the configuration of the radiography apparatus 1 is the same as that of the first embodiment, the description thereof will be omitted.

<Processing>
The flow of image processing including offset correction processing will be described with reference to FIG. 7. FIG. 7 is a flowchart showing an example of the operation of the radiography apparatus according to the present embodiment. In step S701, the user inputs a imaging mode for capturing a radiographic image of the subject from the input device 4, and the radiographic imaging device 1 receives the imaging mode via the control device 2, the HUB 7, and the AP8. In this case, the display device 3 may display the shooting mode in order for the user to select the shooting mode.

In step S702, the power supply control unit 152 detects whether or not the power is supplied from the external interface 141. If the power is supplied from the battery 142 instead of the power supplied from the external interface 141 in step S702, the process proceeds to step S703.

In step S703, it is determined whether or not the required number of shots included in the shooting mode received in S701 is equal to or greater than the predetermined number of shots. If the number of images is a predetermined number or more, the process proceeds to step S704 or later, and offset correction data (non-exposure image data) is acquired after the subject is photographed, and the subject is photographed and the offset correction data is acquired alternately. In step S704, the radiation source 9 irradiates the radiation photographing apparatus 1 with the radiation 10 transmitted through the subject 11, and the radiation photographing apparatus 1 takes a radiation image of the subject in a predetermined photographing mode.

In step S705, the detection module 110 acquires image data (non-exposure image data) taken in the same shooting mode as step S704 received in step S701 as offset correction data corresponding to the shooting mode in step S704. In this case, the detection module 110 acquires unexposed image data in the same imaging mode as the imaging of the radiation image in step S704 as offset correction data.

In step S706, the image processing unit 121 performs the offset correction processing by subtracting the offset correction data from the radiation image. In step S707, the image processing unit 121 outputs the corrected image subjected to the offset correction processing in step S706.

If the power is supplied from the external interface 141 in step S702, the process proceeds to step S708 and subsequent steps, and offset correction data (non-exposure image data) is acquired before shooting the subject. In step S703, even if the required number of shots included in the shooting mode received in S701 is less than the predetermined number, the process proceeds to step S708 and subsequent steps in the same manner, and the offset correction data (non-exposure image) acquired before shooting the subject. Offset correction is performed using the data).

In step S708, the detection module 110 determines whether or not the offset correction data (non-exposure image data) of the shooting mode to be shot in step S710 is stored in the storage unit 122. If the non-exposure image data is not stored, the process proceeds to step S709, and if the non-exposure image data is stored, the process proceeds to step S610.

In step S709, the detection module 110 acquires the image data (non-exposure image data) taken in the shooting mode of step S710 received in step S701 as offset correction data corresponding to the shooting mode in step S710.

As the offset correction data to be acquired, the offset correction data may be generated from a plurality of non-exposure image data. For example, a plurality of unexposed image data may be acquired and the average thereof may be used as offset correction data.

In step S710, the radiation source 9 irradiates the radiation photographing apparatus 1 with the radiation 10 transmitted through the subject 11, and the radiation photographing apparatus 1 takes a radiation image of the subject in a predetermined photographing mode, and in steps S706 and S707. move on.

As described above, according to the present embodiment, the offset correction data acquisition mode is switched according to the required number of shots in addition to the determination of whether the power supply is external power supply or battery power supply.

More specifically, when the power supply form is power supply from a battery and the required number of shots is a predetermined number or more, the offset correction data is acquired after each shot of the subject. Switch to the acquisition mode of 1. This enables long-term operation with reduced battery consumption and shooting of the required number of shots. Further, when the power supply mode is power supply from the battery and the required number of shots is less than a predetermined number, the second acquisition mode for acquiring the offset correction data acquired in advance before shooting the subject is entered. To switch. This makes it possible to support high frame rate shooting.

In this way, even when operating with a limited energy supply source such as a battery, by selecting the offset correction processing suitable for high frame rate shooting under limited conditions, the image quality of the shot image and the shooting time can be determined. Both of the number of sheets can be kept. Therefore, it is possible to improve the convenience of the user.

In the second to fourth embodiments, an example is shown in which a second determination step (steps S503, S603, S703) is provided in addition to the determination as to whether or not the power supply is external power supply. However, the offset correction data acquisition mode may be switched as the second determination step by combining the second determination steps in each embodiment.

(Other embodiments)
The present invention supplies a program that realizes one or more functions of the above-described embodiment to a system or device via a network or storage medium, and one or more processors in the computer of the system or device reads and executes the program. It can also be realized by the processing to be performed. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

1: Radiation imaging device, 141: External interface, 142: Battery, 150: Control module, 151: Imaging device control unit, 152: Power supply control unit

Claims (13)

A radiographic apparatus capable of operating in at least one of a plurality of power supply forms including a battery and an external power source.
The power supply control means for determining the power supply form and
A control means for controlling the operation of the radiography apparatus is provided.
The control means acquires, according to the power supply mode, a first acquisition mode for acquiring offset correction data after shooting the subject for each shooting of the subject, and offset correction data acquired in advance before shooting the subject. Switch to the second acquisition mode,
The control means switches to the first acquisition mode when the power is supplied from the battery, and switches to the second acquisition mode when the power is supplied from the external power source. A radiographic imaging device characterized by. The first aspect of claim 1, wherein the control means switches to the first acquisition mode when the power is supplied from the battery and the operation by the power supply from the battery elapses for a predetermined time. Radiation imaging device. The control means is characterized in that it switches to the second acquisition mode when the power is supplied from the battery and the operation by the power supply from the battery has not elapsed for a predetermined time. The radiography apparatus described in. Any of claims 1 to 3, wherein the control means switches to the first acquisition mode when the power is supplied from the battery and the remaining capacity of the battery is equal to or less than a predetermined amount. The radiography apparatus according to item 1. The radiography according to claim 1, wherein the control means switches to the second acquisition mode when the power is supplied from the battery and the remaining capacity of the battery is larger than a predetermined amount. Device. The control means according to claim 1 to 5 , wherein the control means switches to the first acquisition mode when the power is supplied from the battery and the required number of shots is a predetermined number or more. The radiography apparatus according to any one of the following items. The first aspect of claim 1, wherein the control means switches to the second acquisition mode when the power is supplied from the battery and the required number of shots is less than a predetermined number. Radiation imaging device. Receiving means to receive the shooting mode and
An acquisition means for acquiring offset correction data corresponding to the shooting mode in the first acquisition mode or the second acquisition mode.
The radiography apparatus according to any one of claims 1 to 7, further comprising. The radiographic imaging apparatus according to claim 8, wherein in the first acquisition mode, the acquisition means acquires the offset correction data during continuous imaging of the subject. The radiography apparatus according to claim 8 or 9, wherein the acquisition means generates the offset correction data from a plurality of non-exposure image data. The radiography apparatus according to any one of claims 1 to 10.
A radiation source that irradiates the radiographer,
An input device that accepts input of the imaging mode of the radiography apparatus,
A display device that displays information on the first acquisition mode and the acquisition mode including the second acquisition mode, and
A radiography system characterized by being equipped with. A method of controlling a radiographic apparatus capable of operating in at least one of a plurality of power supply forms including a battery and an external power supply.
A power supply control step in which the power supply control means determines the power supply form, and
The control means includes a control step for controlling the operation of the radiography apparatus.
In the control step, a first acquisition mode for acquiring offset correction data after shooting the subject and offset correction data acquired in advance before shooting the subject are acquired for each shooting of the subject, depending on the power supply mode. Switch to the second acquisition mode,
In the control step, switching to the first acquisition mode is performed when the power is supplied from the battery, and switching to the second acquisition mode is performed when the power is supplied from the external power source. A method for controlling a radiography apparatus, which comprises. A program for causing a computer to function as each means of the radiography apparatus according to any one of claims 1 to 10.

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