JP7733007B2 - Radiation diagnostic equipment - Google Patents

Description

The technology disclosed herein relates to a radiological diagnostic device.

Radiation diagnostic devices are known that irradiate a patient with radiation to obtain a radiation image. Radiation diagnostic devices are equipped with a radiation detector that detects radiation and outputs a radiation image. Radiation detectors include portable radiation detectors (also known as electronic cassettes) in which a detection panel called a flat panel detector is housed in a portable housing. Portable radiation detectors are housed on a fixed imaging table installed in a radiography room. Taking advantage of their mobility, portable radiation detectors are also sometimes removed from the imaging table in a radiography room and held by the patient, or placed under a patient lying supine on a hospital bed. For this reason, portable radiation detectors are at risk of becoming contaminated by bacteria and/or viruses adhering to them through contact with the patient.

JP 2013-248124 A describes a mobile radiography device as a radiological diagnostic device that travels around hospital rooms to perform radiography (so-called mobile radiography). The mobile radiography device described in JP 2013-248124 A is equipped with a holder that houses a portable radiation detector, and the holder is provided with an ultraviolet light source that emits ultraviolet light. The portable radiation detector housed in the holder is sterilized by this ultraviolet light source. Note that sterilization refers to the inactivation of bacteria and/or viruses.

Portable radiation detectors are often housed in a radiography table installed in a radiography room. For this reason, when performing mobile radiography, which is less frequent than when the detector is housed in a radiography table, it is not efficient to sterilize the portable radiation detector with an ultraviolet light source, as is the case with the mobile radiography device described in JP 2013-248124 A.

One embodiment of the technology disclosed herein provides a radiological diagnostic device that is capable of more efficiently sterilizing portable radiation detectors.

The radiological diagnostic device disclosed herein comprises an imaging table that houses a portable radiation detector that detects radiation and outputs a radiological image, an ultraviolet light source that is provided inside the imaging table and emits ultraviolet light, and an ultraviolet light source control unit that controls the operation of the ultraviolet light source.

It is preferable that the ultraviolet light source control unit causes the ultraviolet light source to stop emitting ultraviolet light when a predetermined set time has elapsed since the emission of ultraviolet light began.

It is preferable that the portable radiation detector is provided with a detection unit that detects whether or not the portable radiation detector is housed inside the imaging table, and that if the detection unit detects that the portable radiation detector is housed inside the imaging table, the ultraviolet light is emitted by the ultraviolet source, and if the detection unit detects that the portable radiation detector is not housed inside the imaging table, the ultraviolet light is not emitted by the ultraviolet source.

The imaging platform has a tray on which the portable radiation detector is removably placed, and a holder in which the tray is inserted and removed. The detection unit has a first sensor that detects whether the portable radiation detector is attached to the tray, and a second sensor that detects whether the tray is inserted into the holder. When the first sensor detects that the portable radiation detector is attached to the tray and the second sensor detects that the tray is inserted into the holder, it is preferable that ultraviolet light is emitted from the ultraviolet source, and when the first sensor detects that the portable radiation detector has been removed from the tray, ultraviolet light is not emitted from the ultraviolet source.

If the second sensor detects that the tray has been pulled out of the holder, it is preferable that the ultraviolet light source not emit ultraviolet light.

It is preferable that the ultraviolet light source control unit varies at least one of the intensity and wavelength of the ultraviolet light depending on the time of day.

It is preferable that the device is provided with an imaging menu reception unit that receives an imaging menu indicating the contents of the radiation imaging, and the ultraviolet light source control unit changes at least one of the intensity and wavelength of the ultraviolet light in accordance with the imaging menu received by the imaging menu reception unit.

It is preferable that the ultraviolet light source control unit have a higher sterilization ability when using a shooting menu that does not use a shooting stand than when using a shooting menu that uses a shooting stand.

It is preferable that the ultraviolet light source control unit changes the sterilization capability by changing at least one of the intensity and wavelength of the ultraviolet light.

The technology disclosed herein makes it possible to provide a radiological diagnostic device that can sterilize portable radiation detectors more efficiently.

FIG. 1 is a diagram illustrating a radiological diagnostic apparatus. FIG. 1 illustrates a portable radiation detector. FIG. 10 is a diagram showing a standing holder and a standing tray. FIG. 10 is a diagram showing a lying position holder and a lying position tray. FIG. 2 is a block diagram showing the processing units of the CPU of the control device and the console. FIG. 10 is a diagram showing an irradiation condition table. 10A and 10B are diagrams showing how ultraviolet rays are emitted by an ultraviolet source when the portable radiation detector is housed inside an imaging table. FIG. 10 is a diagram showing a mode in which ultraviolet rays are not emitted from the ultraviolet source when the portable radiation detector is not housed inside the imaging table. 10A and 10B are diagrams showing a mode in which the ultraviolet light source stops emitting ultraviolet light when a preset time has elapsed since the emission of ultraviolet light was started. 10A and 10B are diagrams showing a state in which ultraviolet light is not emitted from the ultraviolet light source when the tray is pulled out from the holder. 10 is a flowchart showing a processing procedure of the control device. FIG. 10 is a diagram showing a schedule for changing the intensity and wavelength of ultraviolet light according to the time of day. 10 is a diagram showing the intensity and central wavelength of ultraviolet light when the photography menu accepted by the photography menu accepting unit is only a photography menu using the photography stand. FIG. 10 is a diagram showing the intensity and central wavelength of ultraviolet light when the photography menu received by the photography menu receiving unit includes a photography menu that does not use a photography stand. FIG.

[First embodiment]
As shown in FIG. 1 as an example, the radiological diagnostic apparatus 2 is an apparatus that irradiates a patient P with radiation R such as X-rays or gamma rays to capture a radiological image RI of the patient P, and is operated by a radiologist. The radiological diagnostic apparatus 2 includes a radiation source 10, a portable radiation detector 11, a voltage generator 12, a control device 13, a console 14, an upright radiographic stand 15S, and a supine radiographic stand 15L. The radiation source 10, the voltage generator 12, the control device 13, the upright radiographic stand 15S, and the supine radiographic stand 15L are installed, for example, in a radiographic room in a medical facility. Meanwhile, the console 14 is installed, for example, in a control room adjacent to the radiographic room. One each of the radiation source 10 and the portable radiation detector 11 is provided, and is shared by both the upright radiographic stand 15S and the supine radiographic stand 15L. The upright radiographic stand 15S and the supine radiographic stand 15L are examples of "radiographic stands" according to the technology of the present disclosure. In the following description, the standing position imaging platform 15S and the lying position imaging platform 15L may be collectively referred to as the imaging platform 15.

The radiation source 10 includes a radiation tube 20 that emits radiation R and an irradiation field limiter (also called a collimator) 21 that limits the irradiation field of the radiation R. The radiation tube 20 is equipped with, for example, a filament, a target, a grid electrode, etc. (all not shown). A voltage is applied from a voltage generator 12 between the filament, which serves as a cathode, and the target, which serves as an anode. The voltage applied between the filament and the target is called the tube voltage. The filament emits thermoelectrons toward the target in response to the applied tube voltage. The target emits radiation R due to collisions of the thermoelectrons from the filament. A grid electrode is disposed between the filament and the target. The grid electrode changes the flow rate of thermoelectrons from the filament toward the target in response to the voltage applied from the voltage generator 12. The flow rate of thermoelectrons from the filament toward the target is called the tube current.

The irradiation field limiter 21 has an entrance opening through which radiation R from the radiation tube 20 enters and an exit opening through which radiation R exits. Four shielding plates are provided near the exit opening. The shielding plates are made of a material that blocks radiation R, such as lead. The shielding plates are arranged on each side of a rectangle, in other words, arranged in a checkered pattern, forming a rectangular irradiation opening that allows radiation R to pass through. The irradiation field limiter 21 changes the size of the irradiation opening by changing the position of each shielding plate, thereby changing the irradiation field of radiation R.

The radiation source 10 is suspended from the ceiling of the radiography room by a support 22. The support 22 is attached via wheels to rails that run around the ceiling. The support 22, and therefore the radiation source 10, can move horizontally within the radiography room using the rails and wheels. The support 22 can also extend and retract in the vertical direction, allowing the radiation source 10 to move in the vertical direction. Furthermore, the radiation source 10 can rotate relative to the support 22 around an axis perpendicular to the plane of the paper.

The portable radiation detector 11 detects radiation R that has passed through the patient P and outputs a radiological image RI of the patient P. The portable radiation detector 11 transmits the radiological image RI to the control device 13. The portable radiation detector 11 is housed in the upright radiography table 15S or the supine radiography table 15L for use. Alternatively, the portable radiation detector 11 may be removed from the upright radiography table 15S or the supine radiography table 15L and held by the patient P in the radiography room, or placed under the patient P lying supine on a bed in a hospital room. Note that Figure 1 illustrates an example of radiography being performed to capture a radiological image RI of the chest of patient P positioned in front of the upright radiography table 15S.

The voltage generator 12 generates a tube voltage to be applied to the radiation tube 20. The voltage generator 12 and the radiation tube 20 are connected by a voltage cable. The tube voltage generated by the voltage generator 12 is supplied to the radiation tube 20 via this voltage cable.

The control device 13 controls the operation of the radiation source 10 via the voltage generator 12. The control device 13 acquires the irradiation conditions of radiation R from the console 14. The irradiation conditions are the tube voltage applied to the radiation tube 20, the tube current, and the irradiation time of radiation R (see Figure 6). Note that instead of the tube current and irradiation time, the product of the tube current and irradiation time, the so-called mAs value, may also be used as the irradiation condition.

A radiologist inputs a command to start radiography into the control device 13 via an irradiation switch (not shown). The irradiation switch is installed in the control room. When a start command is input, the control device 13 operates the voltage generator 12 under the irradiation conditions obtained from the console 14, causing the radiation tube 20 to emit radiation R.

The control device 13 also controls the operation of the portable radiation detector 11. The control device 13 causes the portable radiation detector 11 to perform an accumulation operation to accumulate signal charges in the pixels in synchronization with the timing at which the radiation source 10 starts irradiating radiation R, and causes the portable radiation detector 11 to perform a readout operation to read out the signal charges from the pixels in synchronization with the timing at which the radiation source 10 stops irradiating radiation R. The control device 13 receives the radiation image RI transmitted from the portable radiation detector 11. The control device 13 transfers the radiation image RI to the console 14.

The console 14 is, for example, a personal computer. A radiological technologist inputs an imaging menu into the console 14. The console 14 transmits irradiation conditions according to the input imaging menu to the control device 13. The console 14 also receives the radiological image RI transferred from the control device 13, performs image processing on the received radiological image RI, and displays the processed radiological image RI on the display 93 (see Figure 5).

The console 14 is communicatively connected to a Radiology Information System (RIS) via a network such as a LAN (Local Area Network). The console 14 receives imaging orders from the RIS. The imaging orders contain specific details of the radiography to be performed on patient P. The console 14 is also communicatively connected to an image database server via the network. The image database server is, for example, a PACS (Picture Archiving and Communication System) server, which receives radiographic images RI from the console 14 and stores and manages the received radiographic images RI.

The upright radiography platform 15S includes a stand 25, a connection part 26, and an upright holder 27S. The stand 25 is composed of a base 28 that is placed on the floor of the radiography room and a support post 29 that extends vertically from the base 28. The connection part 26 connects the upright holder 27S to the stand 25. The connection part 26, and therefore the upright holder 27S, is movable vertically relative to the support post 29, allowing the height to be adjusted according to the height of the patient P or the area to be radiographed.

The standing holder 27S is box-shaped and houses the portable radiation detector 11 inside. The majority of the standing holder 27S is made of a conductive material with electromagnetic wave shielding properties, such as aluminum or stainless steel. The front surface of the standing holder 27S, which faces the radiation source 10, is made of a material that transmits radiation R, such as carbon. The standing holder 27S is an example of a "holder" according to the technology disclosed herein.

The supine position radiography table 15L includes a base 30, a connection part 31, a top plate 32, and a supine position holder 27L, which are installed on the floor of the radiography room. The connection part 31 connects the top plate 32 to the base 30. The base 30 is elevating type, which allows the height of the top plate 32 and the supine position holder 27L to be adjusted. The top plate 32 is a rectangular plate with a length and width that allows the patient P to lie supine, and is made of a material that transmits radiation R, such as carbon.

The lying position holder 27L is disposed in the space formed by the connection portion 31 between the base 30 and the top plate 32. The lying position holder 27L is box-shaped, with the top covered by the top plate 32, and houses the portable radiation detector 11 inside. The lying position holder 27L is made of a conductive material with electromagnetic wave shielding properties, such as aluminum or stainless steel. The lying position holder 27L can slide along the long side of the top plate 32 using a sliding mechanism (not shown). The lying position holder 27L is an example of a "holder" according to the technology disclosed herein. Note that, hereinafter, the standing position holder 27S and the lying position holder 27L may be collectively referred to as the holder 27.

As an example, as shown in FIG. 2, the portable radiation detector 11 has a housing 40 and a detection panel 41. The housing 40 has a flat, approximately rectangular parallelepiped shape with a rectangular planar shape, and houses the detection panel 41 inside. Most of the front surface of the housing 40 is formed from a material that transmits radiation R, such as carbon. The portable radiation detector 11 is placed in the holder 27 with the front surface of the housing 40 facing the radiation source 10.

The detection panel 41 is configured with an array of multiple pixels that generate signal charges in response to radiation R or visible light converted from radiation R by a scintillator. In addition to the detection panel 41, the housing 40 also houses a control circuit that controls the operation of the detection panel 41, and a signal processing circuit that converts the pixel signal charges into pixel values to generate a radiological image RI. It also houses a communication unit that performs wired or wireless communication with the control device 13, and a battery that supplies power to each component. The portable radiation detector 11 may also be a so-called CR (Computed Radiography) cassette that incorporates an imaging plate instead of the detection panel 41.

As an example, as shown in Figure 3, a standing tray 45S is arranged in the standing holder 27S so that it can be inserted and removed. The standing holder 27S is provided with rails to guide the standing tray 45S and a locking mechanism to lock the standing tray 45S in the inserted position. Figure 3 shows the standing tray 45S removed from the standing holder 27S. The standing tray 45S is an example of a "tray" according to the technology disclosed herein.

A portable radiation detector 11 is removably mounted on the standing tray 45S. The standing tray 45S is provided with a holding mechanism that holds the portable radiation detector 11 by sandwiching it vertically. A standing ultraviolet light source 46S that emits sterilizing ultraviolet light is attached to the side of the standing tray 45S. The standing ultraviolet light source 46S irradiates the portable radiation detector 11 attached to the standing tray 45S with ultraviolet light. The standing ultraviolet light source 46S can be a typical ultraviolet lamp using a quartz tube, such as an excimer lamp, or an LED (light-emitting diode) or LD (laser diode). The central wavelength of the ultraviolet light is 200 nm or more and 280 nm or less, for example, 222 nm. The intensity of the ultraviolet light is constant. The standing ultraviolet light source 46S is an example of an "ultraviolet light source" according to the technology disclosed herein.

A first standing sensor 47S is provided on the standing tray 45S. The first standing sensor 47S detects whether a portable radiation detector 11 is attached to the standing tray 45S. The first standing sensor 47S is a limit switch that turns on when the portable radiation detector 11 is attached to the standing tray 45S and turns off when the portable radiation detector 11 is removed from the standing tray 45S. Alternatively, the first standing sensor 47S is a photosensor composed of a light-emitting unit and a light-receiving unit. In this case, when the portable radiation detector 11 is attached to the standing tray 45S, light from the light-emitting unit is blocked, and when the portable radiation detector 11 is removed from the standing tray 45S, light from the light-emitting unit is received by the light-receiving unit. The first standing sensor 47S is an example of a "first sensor" according to the technology disclosed herein.

A second standing position sensor 48S is provided within the standing position holder 27S. The second standing position sensor 48S detects whether the standing position tray 45S has been inserted into the standing position holder 27S. This second standing position sensor 48S and the first standing position sensor 47S described above constitute a standing position detection unit 49S (see Figure 5). The second standing position sensor 48S is an example of a "second sensor" according to the technology disclosed herein. The standing position detection unit 49S is also an example of a "detection unit" according to the technology disclosed herein.

The second standing position sensor 48S is a limit switch that turns on when the standing position tray 45S is inserted into the standing position holder 27S and turns off when the standing position tray 45S is pulled out of the standing position holder 27S. Alternatively, the second standing position sensor 48S is a photosensor composed of a light-emitting unit and a light-receiving unit. In this case, when the standing position tray 45S is inserted into the standing position holder 27S, light from the light-emitting unit is blocked, and when the standing position tray 45S is pulled out of the standing position holder 27S, light from the light-emitting unit is received by the light-receiving unit.

A handle 50 is provided on the side of the standing tray 45S. The handle 50 is grasped by the radiologist when inserting the standing tray 45S into the standing holder 27S and when withdrawing it from the standing holder 27S. When the handle 50 is grasped in the inserted state, the locking mechanism of the standing tray 45S is released.

As an example, as shown in FIG. 4, a lying-position tray 45L is arranged in the lying-position holder 27L so that it can be inserted and removed. The lying-position holder 27L is provided with rails to guide the lying-position tray 45L and a locking mechanism to lock the lying-position tray 45L in the inserted position. FIG. 4 shows the lying-position tray 45L removed from the lying-position holder 27L. The lying-position tray 45L is an example of a "tray" according to the technology of the present disclosure. Note that, hereinafter, the standing-position tray 45S and the lying-position tray 45L may be collectively referred to as tray 45.

The portable radiation detector 11 is removably mounted on the lying-down tray 45L. The lying-down tray 45L is provided with a holding mechanism that holds the portable radiation detector 11 by clamping it laterally. A lying-down UV source 46L, which emits sterilizing UV light, is attached to the side of the lying-down tray 45L. The lying-down UV source 46L irradiates the UV light toward the portable radiation detector 11 attached to the lying-down tray 45L. As with the standing-down UV source 46S, the lying-down UV source 46L can be a typical UV lamp using a quartz tube, such as an excimer lamp, or an LED or LD. As with the standing-down UV source 46S, the UV light has a central wavelength of 200 nm or more and 280 nm or less, e.g., 222 nm. The UV light intensity is constant. The ultraviolet light source for the lying position 46L is an example of an “ultraviolet light source” according to the technology of the present disclosure. Note that, hereinafter, the ultraviolet light source for the standing position 46S and the ultraviolet light source for the lying position 46L may be collectively referred to as the ultraviolet light source 46.

The lying position tray 45L is provided with a first lying position sensor 47L. The first lying position sensor 47L detects whether the portable radiation detector 11 is attached to the lying position tray 45L. Like the first standing position sensor 47S, the first lying position sensor 47L is a limit switch that turns on when the portable radiation detector 11 is attached to the lying position tray 45L and turns off when the portable radiation detector 11 is removed from the lying position tray 45L. Alternatively, the first lying position sensor 47L is a photosensor composed of a light-emitting unit and a light-receiving unit. In this case, when the portable radiation detector 11 is attached to the lying position tray 45L, light from the light-emitting unit is blocked, and when the portable radiation detector 11 is removed from the lying position tray 45L, light from the light-emitting unit is received by the light-receiving unit. The first sensor for lying down 47L is an example of a “first sensor” according to the technology of the present disclosure. Note that, hereinafter, the first sensor for standing up 47S and the first sensor for lying down 47L may be collectively referred to as the first sensor 47.

A second sensor for lying position 48L is provided within the lying position holder 27L. The second sensor for lying position 48L detects whether the tray for lying position 45L is inserted into the holder for lying position 27L. This second sensor for lying position 48L and the first sensor for lying position 47L described above constitute a detection unit for lying position 49L (see FIG. 5). The second sensor for lying position 48L is an example of a "second sensor" according to the technology disclosed herein. The detection unit for lying position 49L is an example of a "detection unit" according to the technology disclosed herein. Note that, below, the second sensor for standing position 48S and the second sensor for lying position 48L may be collectively referred to as the second sensor 48. Similarly, the detection unit for standing position 49S and the detection unit for lying position 49L may be collectively referred to as the detection unit 49.

Like the second sensor for standing position 48S, the second sensor for lying position 48L is a limit switch that turns on when the tray for lying position 45L is inserted into the holder for lying position 27L and turns off when the tray for lying position 45L is removed from the holder for lying position 27L. Alternatively, the second sensor for lying position 48L is a photosensor composed of a light-emitting unit and a light-receiving unit. In this case, when the tray for lying position 45L is inserted into the holder for lying position 27L, light from the light-emitting unit is blocked, and when the tray for lying position 45L is removed from the holder for lying position 27L, light from the light-emitting unit is received by the light-receiving unit.

A handle 52 is provided on the side of the supine tray 45L. The handle 52 is grasped by the radiologist when inserting the supine tray 45L into the supine holder 27L and when withdrawing it from the supine holder 27L. When the handle 52 is grasped in the inserted state, the locking mechanism of the supine tray 45L is released.

As an example, as shown in FIG. 5, the control device 13 includes a storage 70 and a CPU (Central Processing Unit) 71. The storage 70 is, for example, a hard disk drive or a solid state drive. An operating program 72 is stored in the storage 70. When the operating program 72 is started, the CPU 71, in cooperation with memory and the like (not shown), functions as an irradiation condition acquisition unit 75, a radiation source control unit 76, a detector control unit 77, an image transfer unit 78, an upright position ultraviolet light source control unit 79S, and a supine position ultraviolet light source control unit 79L. The upright position ultraviolet light source control unit 79S includes a measurement unit 80S, and the supine position ultraviolet light source control unit 79L includes a measurement unit 80L.

The irradiation condition acquisition unit 75 acquires the irradiation conditions transmitted from the console 14. The irradiation condition acquisition unit 75 outputs the acquired irradiation conditions to the radiation source control unit 76.

The radiation source control unit 76 controls the operation of the radiation source 10. The radiation source control unit 76 sets the irradiation conditions from the irradiation condition acquisition unit 75 in the voltage generator 12. When an instruction to start radiography is input via the irradiation switch, the radiation source control unit 76 causes the radiation tube 20 to emit radiation R under the set irradiation conditions. The radiation source control unit 76 outputs an irradiation start notification signal to notify the start of irradiation of radiation R and an irradiation end notification signal to notify the end of irradiation of radiation R to the detector control unit 77.

The detector control unit 77 controls the operation of the portable radiation detector 11. The detector control unit 77 causes the portable radiation detector 11 to perform an accumulation operation in response to an irradiation start notification signal from the radiation source control unit 76. The detector control unit 77 also causes the portable radiation detector 11 to perform a readout operation in response to an irradiation end notification signal from the radiation source control unit 76. As a result, the detector control unit 77 causes the portable radiation detector 11 to output a radiation image RI. The detector control unit 77 receives the radiation image RI transmitted from the portable radiation detector 11 and outputs the received radiation image RI to the image transfer unit 78. The image transfer unit 78 transfers the radiation image RI from the detector control unit 77 to the console 14. Note that a portable radiation detector 11 that has the function of detecting the start and end of irradiation of radiation R and performs accumulation and readout operations by itself may also be used.

The standing position UV light source control unit 79S controls the operation of the standing position UV light source 46S based on detection signals from the first standing position sensor 47S and the second standing position sensor 48S. Similarly, the lying position UV light source control unit 79L controls the operation of the lying position UV light source 46L based on detection signals from the first lying position sensor 47L and the second lying position sensor 48L. The measurement unit 80S measures the elapsed time since the standing position UV light source 46S began emitting UV light. Similarly, the measurement unit 80L measures the elapsed time since the lying position UV light source 46L began emitting UV light. More specifically, the measurement units 80S and 80L begin measuring the elapsed time when the standing position UV light source control unit 79S and the lying position UV light source control unit 79L output instructions to the standing position UV light source 46S and the lying position UV light source 46L to begin emitting UV light. The measurement of elapsed time continues until the standing position UV source controller 79S and the lying position UV source controller 79L output instructions to stop UV emission to the standing position UV source 46S and the lying position UV source 46L. The measurement units 80S and 80L stop measuring the elapsed time and reset the elapsed time to 0 when the standing position UV source controller 79S and the lying position UV source controller 79L output instructions to stop UV emission to the standing position UV source 46S and the lying position UV source 46L. The standing position UV source controller 79S and the lying position UV source controller 79L are examples of an "ultraviolet source controller" according to the technology disclosed herein. Note that, hereinafter, the standing position UV source controller 79S and the lying position UV source controller 79L may be collectively referred to as the ultraviolet source controller 79. The measurement units 80S and 80L may be collectively referred to as the measurement unit 80.

The console 14 includes a storage 90, a CPU (Central Processing Unit) 91, input devices 92 such as a keyboard and a mouse, and a display 93. The storage 90 is, for example, a hard disk drive or a solid state drive. An operating program 94 and an irradiation condition table 95 are stored in the storage 90. When the operating program 94 is started, the CPU 91, in cooperation with memory and the like (not shown), functions as an imaging menu reception unit 100, an irradiation condition setting unit 101, an image processing unit 102, and a display control unit 103.

Prior to radiography, the display control unit 103 displays a list of radiography orders from the RIS on the display 93. The radiologist views the list of radiography orders and confirms the contents. The display control unit 103 displays, along with the radiography orders, multiple pre-prepared radiography menus in a format that allows the radiologist to select one of them on the display 93. The radiologist operates the input device 92 to select and input the radiography menu that matches the contents of the radiography order. This causes the radiography menu to be accepted by the radiography menu acceptance unit 100. The radiography menu acceptance unit 100 outputs the accepted radiography menu to the irradiation condition setting unit 101.

The irradiation condition setting unit 101 reads out irradiation conditions corresponding to the imaging menu from the irradiation condition table 95 and transmits the read irradiation conditions to the control device 13. The irradiation condition table 95 is a table in which irradiation conditions are registered for each imaging menu, as shown in FIG. 6 as an example. An imaging menu is a combination of imaging areas such as the chest and abdomen, imaging positions such as standing and lying down, and imaging directions such as front and back. Note that the irradiation conditions can be modified via the input device 92 before being transmitted to the control device 13.

The image processing unit 102 performs various image processing on the radiation image RI from the control device 13. The image processing unit 102 performs, for example, offset correction processing, sensitivity correction processing, and defective pixel correction processing.

Offset correction processing is a process in which an offset correction image output without radiation R irradiation is subtracted from the radiation image RI on a pixel-by-pixel basis. By performing this offset correction processing, the image processing unit 102 removes fixed pattern noise caused by dark charge and the like from the radiation image RI. Sensitivity correction processing is a process in which, based on sensitivity correction data, variations in the sensitivity of each pixel of the detection panel 41 of the portable radiation detector 11 and variations in the output characteristics of the circuit that reads out signal charge are corrected. Defective pixel correction processing is a process in which, based on information about defective pixels with abnormal pixel values generated at the time of shipment or during periodic inspection, the pixel values of defective pixels are linearly interpolated with the pixel values of surrounding normal pixels. The image processing unit 102 outputs the radiation image RI that has been subjected to these various image processing processes to the display control unit 103. The display control unit 103 displays the radiation image RI from the image processing unit 102 on the display 93.

7, the ultraviolet light source control unit 79 instructs the ultraviolet light source 46 to emit ultraviolet light when the detection unit 49 detects that the portable radiation detector 11 has been placed inside the imaging table 15. The detection unit 49 detects that the portable radiation detector 11 has been placed inside the imaging table 15 in the following cases: That is, when the first sensor 47 detects that the portable radiation detector 11 has been placed on the tray 45 (first sensor 47 is ON), and when the second sensor 48 detects that the tray 45 has been inserted into the holder 27 (second sensor 48 is ON).

On the other hand, as shown in FIG. 8 as an example, when the detection unit 49 detects that the portable radiation detector 11 is not housed inside the imaging stand 15, the ultraviolet light source control unit 79 does not instruct the ultraviolet light source 46 to emit ultraviolet light or outputs a signal to the ultraviolet light source 46 to prohibit the emission of ultraviolet light. The detection unit 49 detects that the portable radiation detector 11 is not housed inside the imaging stand 15 in the following cases: That is, when the first sensor 47 detects that the portable radiation detector 11 has been removed from the tray 45 (the first sensor 47 is OFF). In this case, even if the tray 45 is inserted into the holder 27 and the second sensor 48 is turned ON, the ultraviolet light source 46 does not emit ultraviolet light.

As an example, as shown in FIG. 9 , the ultraviolet light source control unit 79 controls the ultraviolet light source 46 to stop emitting ultraviolet light when the elapsed time measured by the measurement unit 80 reaches a preset time TS and the preset time TS has elapsed since the start of ultraviolet light emission. The preset time TS varies depending on the intensity of the ultraviolet light and the type of bacteria and/or viruses to be sterilized, but is generally between several seconds and several tens of minutes. For example, it has been reported that the novel coronavirus (SARS (Severe Acute Respiratory Syndrome) - CoV (Coronavirus)-2) can be inactivated by irradiation with ultraviolet light for several seconds. More specifically, it has been reported that 99.7% of the virus is inactivated by irradiation with ultraviolet light with a central wavelength of 222 nm and an intensity of 1 W/ ^m² for 30 seconds (https://xtech.nikkei.com/atcl/nxt/news/18/08672/). It has also been reported that 99.9% of ultraviolet rays with a central wavelength of 254 nm are inactivated in 10 to 15 seconds (https://robotstart.info/2020/09/10/uvbuster-covid19.html). Note that the ultraviolet source control unit 79 instructs the ultraviolet source 46 to emit ultraviolet rays when the detection unit 49 detects that the portable radiation detector 11 has been housed inside the imaging table 15, and even after the ultraviolet source control unit 79 instructs the ultraviolet source 46 to stop emitting ultraviolet rays after a set time has elapsed since the start of ultraviolet emission, the ultraviolet source control unit 79 continues to emit ultraviolet rays from the ultraviolet source 46 for a set time TS at regular intervals, such as every 30 minutes.

As an example, as shown in Figure 10, when the second sensor 48 detects that the tray 45 has been pulled out of the holder 27, the ultraviolet light source control unit 79 instructs the ultraviolet light source 46 to stop emitting ultraviolet light. Figure 10 shows an example in which the tray 45 has been pulled out of the holder 27 before the set time TS has elapsed since the start of ultraviolet light emission, so the ultraviolet light source control unit 79 causes the ultraviolet light source 46 to stop emitting ultraviolet light.

Next, the operation of the above configuration will be described with reference to the flowchart shown in Figure 11. As shown in Figure 5, when the operating program 72 is started, the CPU 71 of the control device 13 functions as an irradiation condition acquisition unit 75, radiation source control unit 76, detector control unit 77, image transfer unit 78, standing position ultraviolet source control unit 79S, and lying position ultraviolet source control unit 79L. The standing position ultraviolet source control unit 79S includes a measurement unit 80S, and the lying position ultraviolet source control unit 79L includes a measurement unit 80L. Furthermore, when the operating program 94 is started, the CPU 91 of the console 14 functions as an imaging menu reception unit 100, irradiation condition setting unit 101, image processing unit 102, and display control unit 103.

The procedure for radiography using the radiological diagnostic device 2 begins with the radiography preparation work. The radiography preparation work is performed by a radiological technologist. Specifically, the radiological preparation work includes the work of setting the irradiation conditions and the work of positioning the patient P, etc. After completing the radiography preparation work, the radiological technologist operates the irradiation switch to instruct the start of radiography.

To set the irradiation conditions, the radiologist operates the input device 92 to input an imaging menu corresponding to the imaging order from the RIS. The imaging menu is received by the imaging menu reception unit 100. The irradiation conditions corresponding to the imaging menu received by the imaging menu reception unit 100 are then read from the irradiation condition table 95 by the irradiation condition setting unit 101. The irradiation conditions are transmitted from the irradiation condition setting unit 101 to the control device 13.

After inputting the imaging menu, the radiologist positions the patient P in front of the upright imaging table 15S or lies supine on the top plate 32 of the supine imaging table 15L. Then, positioning is performed by adjusting the position of the radiation source 10 or the upright holder 27S or supine holder 27L.

In the control device 13, the irradiation condition acquisition unit 75 acquires the irradiation conditions from the console 14. The irradiation conditions are output from the irradiation condition acquisition unit 75 to the radiation source control unit 76, and are set in the voltage generator 12 by the radiation source control unit 76.

When an instruction to start radiography is given, radiation R is irradiated from the radiation tube 20 toward the patient P under the control of the radiation source control unit 76. As a result, a radiological image RI is output from the portable radiation detector 11 under the control of the detector control unit 77. The radiological image RI is output from the portable radiation detector 11 to the detector control unit 77, and further output from the detector control unit 77 to the image transfer unit 78. The radiological image RI is transferred to the console 14 by the image transfer unit 78.

In the console 14, the image processing unit 102 performs various image processing on the radiation image RI. The radiation image RI that has undergone various image processing is output from the image processing unit 102 to the display control unit 103. Then, under the control of the display control unit 103, it is displayed on the display 93 and made available for viewing by the radiologist.

On the imaging table 15, a first sensor 47 detects whether the portable radiation detector 11 has been attached to the tray 45. A second sensor 48 detects whether the tray 45 has been inserted into the holder 27.

As an example, as shown in Figure 11, when the first sensor 47 detects that the portable radiation detector 11 has been attached to the tray 45 and the second sensor 48 detects that the tray 45 has been inserted into the holder 27 (YES in both steps ST100 and ST110), as shown in Figure 7, ultraviolet light is emitted by the ultraviolet source 46 under the control of the ultraviolet source control unit 79 (step ST120).

On the other hand, if the first sensor 47 detects that the portable radiation detector 11 has been removed from the tray 45 (NO in step ST100), the ultraviolet light source 46 does not emit ultraviolet light, as shown in Figure 8. Similarly, if the second sensor 48 detects that the tray 45 has been pulled out of the holder 27 (NO in step ST110), the ultraviolet light source 46 does not emit ultraviolet light.

The measuring unit 80 measures the time elapsed since the start of ultraviolet radiation emission (step ST130). The ultraviolet radiation source 46 continues emitting ultraviolet radiation until the elapsed time reaches the set time TS (NO in step ST150). When the elapsed time reaches the set time TS and the set time TS has elapsed since the start of ultraviolet radiation emission (YES in step ST150), the ultraviolet radiation emission from the ultraviolet radiation source 46 is stopped under the control of the ultraviolet radiation source control unit 79 (step ST160), as shown in FIG. 9 . Furthermore, if the second sensor 48 detects that the tray 45 has been removed from the holder 27 before the set time TS has elapsed since the start of ultraviolet radiation emission (YES in step ST140), the ultraviolet radiation emission from the ultraviolet radiation source 46 is also stopped under the control of the ultraviolet radiation source control unit 79 (step ST160).

As described above, the radiological diagnostic device 2 comprises an imaging table 15 that houses a portable radiation detector 11 that detects radiation R and outputs a radiological image RI, an ultraviolet light source 46 that is provided inside the imaging table 15 and emits ultraviolet light, and an ultraviolet light source control unit 79 that controls the operation of the ultraviolet light source 46. Therefore, it is possible to sterilize the portable radiation detector 11 more efficiently than the mobile radiological imaging device described in JP 2013-248124 A, which is used for mobile radiological imaging, which is used less frequently than the mode in which it is housed in the imaging table 15.

The ultraviolet light source control unit 79 causes the ultraviolet light source 46 to stop emitting ultraviolet light when a preset time TS has elapsed since ultraviolet light emission began. This reduces unnecessary power consumption. Furthermore, if the housing 40 of the portable radiation detector 11 has parts that are subject to mechanical deterioration (peeling, decomposition, etc.) and/or cosmetic deterioration (discoloration, etc.) due to ultraviolet light, this reduces deterioration of the housing 40 due to unnecessary ultraviolet light irradiation.

The portable radiation detector 11 is equipped with a detection unit 49 that detects whether or not it is housed inside the imaging stand 15. If the detection unit 49 detects that the portable radiation detector 11 is housed inside the imaging stand 15, the ultraviolet light source 46 emits ultraviolet light. On the other hand, if the detection unit 49 detects that the portable radiation detector 11 is not housed inside the imaging stand 15, the ultraviolet light source 46 does not emit ultraviolet light. This ensures that the portable radiation detector 11 is sterilized and reduces unnecessary power consumption.

The imaging platform 15 has a tray 45 on which the portable radiation detector 11 is removably placed, and a holder 27 in which the tray 45 is inserted and removed. The detection unit 49 has a first sensor 47 that detects whether the portable radiation detector 11 is attached to the tray 45, and a second sensor 48 that detects whether the tray 45 is inserted into the holder 27. When the first sensor 47 detects that the portable radiation detector 11 is attached to the tray 45 and the second sensor 48 detects that the tray 45 is inserted into the holder 27, the ultraviolet light source 46 emits ultraviolet light. On the other hand, when the first sensor 47 detects that the portable radiation detector 11 has been removed from the tray 45, the ultraviolet light source 46 does not emit ultraviolet light. This ensures that the portable radiation detector 11 is sterilized and reduces unnecessary power consumption.

Furthermore, when the second sensor 48 detects that the tray 45 has been pulled out of the holder 27, the ultraviolet light source 46 does not emit ultraviolet light. This prevents ultraviolet light from being irradiated onto the radiologist and patient P.

Second Embodiment
In the first embodiment, the central wavelength of the ultraviolet light is set to 222 nm, and the intensity of the ultraviolet light is constant, but this is not limiting. As in the second embodiment shown in Fig. 12, the intensity and wavelength of the ultraviolet light may be changed depending on the time of day.

In the second embodiment, the ultraviolet light source control unit 79 controls the ultraviolet light source 46 to emit ultraviolet light based on a schedule 120 shown in FIG. 12 , for example. That is, during the time period from 09:00, when general medical treatment starts in the morning, to 12:00, when the lunch break starts, the ultraviolet light source control unit 79 controls the ultraviolet light source 46 to emit ultraviolet light with a central wavelength of 254 nm at an intensity of 20 W/ ^m² . During the time period from 13:00, when general medical treatment starts in the afternoon, to 16:00, when the general medical treatment ends, the ultraviolet light source control unit 79 controls the ultraviolet light source 46 to emit ultraviolet light with a central wavelength of 254 nm at an intensity of 15 W/ ^m² . Then, during the time period from 16:00, the ultraviolet light source control unit 79 controls the ultraviolet light source 46 to emit ultraviolet light with a central wavelength of 222 nm at an intensity of 10 W/ ^m² . In this case, two ultraviolet light sources 46 are provided: one that emits ultraviolet light with a central wavelength of 254 nm, and the other that emits ultraviolet light with a central wavelength of 222 nm. Then, during the time slots from 9:00 to 12:00 and from 13:00 to 16:00, the ultraviolet light source control unit 79 operates the ultraviolet light source 46 that emits ultraviolet light with a central wavelength of 254 nm to emit ultraviolet light with a central wavelength of 254 nm. During the time slot from 16:00 onward, the ultraviolet light source control unit 79 operates the ultraviolet light source 46 that emits ultraviolet light with a central wavelength of 222 nm to emit ultraviolet light with a central wavelength of 222 nm. Alternatively, similar control may be performed using a single ultraviolet light source 46 that can switch between emitting ultraviolet light with a central wavelength of 254 nm and ultraviolet light with a central wavelength of 222 nm. The intensity of the ultraviolet light is changed by increasing or decreasing the voltage and/or current applied to the ultraviolet light source 46.

The sterilizing ability of ultraviolet light increases as the intensity of the ultraviolet light increases. Furthermore, ultraviolet light with a central wavelength of 254 nm has a stronger sterilizing ability than ultraviolet light with a central wavelength of 222 nm. The time period from 09:00 to 12:00 is generally the time period during which radiography is most frequently performed, and the portable radiation detector 11 is therefore used more frequently. Therefore, by emitting ultraviolet light with a central wavelength of 254 nm, which has a relatively high sterilizing ability, at the highest intensity of 20 W/ ^m2 during the time period from 09:00 to 12:00, the set time TS required for sterilization of the portable radiation detector 11 can be minimized. The portable radiation detector 11 is used more frequently during the time period from 13:00 to 16:00, although not as frequently as during the time period from 09:00 to 12:00. Therefore, during the time period from 13:00 to 16:00, ultraviolet light with a central wavelength of 254 nm is emitted at the second highest intensity of 15 W/ ^m2 , making it possible to set the set time TS to the second shortest. Since radiography is not performed during the time period from 16:00 onwards, except for emergency cases, the set time TS can be longer. Therefore, ultraviolet light with a central wavelength of 222 nm, which has a relatively low sterilization ability, is emitted at the lowest intensity of 10 W/ ^m2 .

In this way, in the second embodiment, the ultraviolet light source control unit 79 changes the intensity and wavelength of the ultraviolet light according to the time of day. Therefore, the portable radiation detector 11 can be sterilized at a set time TS that is appropriate for each time of day. Note that while an example has been shown in which both the intensity and wavelength of the ultraviolet light are changed, it is sufficient to change at least one of the intensity and wavelength of the ultraviolet light.

[Third embodiment]
In the third embodiment shown in FIGS. 13 and 14, the sterilization ability of ultraviolet light is changed according to the photographing menu received by the photographing menu receiving unit 100.

13, if the imaging menu received by the imaging menu receiving unit 100 only includes an imaging menu that uses the imaging table 15, the ultraviolet light source control unit 79 causes the ultraviolet light source 46 to emit ultraviolet light with a central wavelength of 222 nm at an intensity of 10 W/ ^m² . On the other hand, as shown in FIG. 14, if the imaging menu received by the imaging menu receiving unit 100 includes an imaging menu that does not use the imaging table 15, the ultraviolet light source control unit 79 causes the ultraviolet light source 46 to emit ultraviolet light with a central wavelength of 222 nm at an intensity of 20 W/ ^m² before and after radiography for the imaging menu that does not use the imaging table 15. An imaging menu for radiography that does not use the imaging table 15 is, for example, an imaging menu for imaging the lower limbs or the like, in which the portable radiation detector 11 is removed from the imaging table 15 and held by the patient P. An imaging menu for radiography that does not use the imaging table 15 is an imaging menu for mobile radiography in which the portable radiation detector 11 is placed under a patient lying supine on a bed in a hospital room. The intensity of the ultraviolet light is changed by increasing or decreasing the voltage and/or current applied to the ultraviolet light source 46, as in the second embodiment.

In this way, in the third embodiment, the ultraviolet light source control unit 79 changes the sterilization ability of ultraviolet light according to the shooting menu received by the shooting menu receiving unit 100. Therefore, the portable radiation detector 11 can be sterilized with ultraviolet light with a sterilization ability that matches the shooting menu.

The ultraviolet light source control unit 79 also increases the sterilization capability for imaging menus that do not use the imaging table 15 compared to imaging menus that do use the imaging table 15. For imaging menus that do not use the imaging table 15, there is a very high risk of bacteria and/or viruses adhering to the portable radiation detector 11 through contact with the patient P, resulting in contamination. Therefore, increasing the sterilization capability for imaging menus that do not use the imaging table 15 can greatly enhance the sterilization effect of ultraviolet light. While the example shown here maintains the same central wavelength of 222 nm and only changes the intensity of the ultraviolet light, this is not limiting. The intensity of the ultraviolet light may remain the same, but the central wavelength may be 222 nm when only imaging menus that use the imaging table 15 are available, and 254 nm when imaging menus that do not use the imaging table 15 are available. Alternatively, both the intensity and wavelength of the ultraviolet light may be changed. In other words, it is sufficient to change at least one of the intensity and wavelength of the ultraviolet light.

Although the ultraviolet light source 46 is irradiated with ultraviolet light having a central wavelength of 222 nm at an intensity of 20 W/ ^m2 before and after radiography using an imaging menu that does not use the imaging table 15 in the above embodiment, the present invention is not limited to this. The ultraviolet light source 46 may be irradiated with ultraviolet light having a central wavelength of 222 nm at an intensity of 20 W/ ^m2 only before radiography using an imaging menu that does not use the imaging table 15. Conversely, the ultraviolet light source 46 may be irradiated with ultraviolet light having a central wavelength of 222 nm at an intensity of 20 W/ ^m2 only after radiography using an imaging menu that does not use the imaging table 15.

Although the ultraviolet light source 46 stops emitting ultraviolet light when the set time TS has elapsed since the start of ultraviolet light emission, this is not limited to this. If there are no parts of the housing 40 of the portable radiation detector 11 that are susceptible to deterioration due to ultraviolet light, the ultraviolet light source 46 may continuously emit ultraviolet light while the portable radiation detector 11 is housed inside the imaging table 15. Furthermore, even when the portable radiation detector 11 is not attached to the tray 45, the ultraviolet light source 46 may emit ultraviolet light for the purpose of sterilizing the tray 45.

As described in paragraphs [0028] to [0031] and Figures 7 and 8 of Japanese Patent No. 6306097, ultraviolet light with a central wavelength of 222 nm has less effect on the human body than ultraviolet light with a central wavelength of 254 nm. Therefore, when ultraviolet light with a central wavelength of 222 nm is being emitted, it is not necessary to stop the emission of ultraviolet light from the ultraviolet light source 46 even if the tray 45 is pulled out of the holder 27 before the set time TS has elapsed since the start of ultraviolet light emission.

In the above embodiments, when the detection unit 49 detects that the portable radiation detector 11 has been placed inside the imaging table 15, the ultraviolet light source 46 emits ultraviolet light under the control of the ultraviolet light source control unit 79. However, this is not limited to this. The imaging table 15 may be provided with a switch for turning the ultraviolet light source 46 on and off, and the ultraviolet light may be emitted by the ultraviolet light source 46 manually operated by a radiologist.

The ultraviolet light source 46 may emit ultraviolet light continuously or in pulses. When emitting ultraviolet light in pulses, the intensity of the second and third embodiments is changed by changing the duty ratio of the pulses.

The time elapsed since the start of ultraviolet light emission is measured by a measurement unit 80 built into the CPU 71, but this is not limited to this. The elapsed time may also be measured using hardware such as an RC (Resistance Capacitor) integration circuit.

In each of the above embodiments, the hardware structure of the processing units that perform various processes, such as the irradiation condition acquisition unit 75, radiation source control unit 76, detector control unit 77, image transfer unit 78, standing position ultraviolet source control unit 79S, lying position ultraviolet source control unit 79L, measurement units 80S and 80L, shooting menu reception unit 100, irradiation condition setting unit 101, image processing unit 102, and display control unit 103, can use the various processors shown below. As described above, the various processors include the CPUs 71 and 91, which are general-purpose processors that execute software (operating programs 72 and 94) and function as various processing units, as well as programmable logic devices (PLDs) that are processors whose circuit configuration can be changed after manufacture, such as FPGAs (Field Programmable Gate Arrays), and dedicated electrical circuits that are processors having a circuit configuration designed specifically for executing specific processing, such as ASICs (Application Specific Integrated Circuits).

A single processing unit may be configured with one of these various processors, or may be configured with a combination of two or more processors of the same or different types (e.g., a combination of multiple FPGAs and/or a combination of a CPU and an FPGA). Also, multiple processing units may be configured with a single processor.

Examples of configuring multiple processing units with a single processor include, first, a configuration where one processor is configured with a combination of one or more CPUs and software, and this processor functions as multiple processing units, as is typical of client and server computers. Second, a configuration where a processor is used to realize the functions of the entire system, including multiple processing units, on a single IC (Integrated Circuit) chip, as is typical of systems on chips (SoCs). In this way, the various processing units are configured as a hardware structure using one or more of the various processors listed above.

Furthermore, the hardware structure of these various processors can be, more specifically, an electrical circuit (circuitry) that combines circuit elements such as semiconductor elements.

The technology disclosed herein can be implemented by appropriately combining the various embodiments and/or variations described above. Furthermore, it is not limited to the above embodiments, and various configurations can be adopted without departing from the spirit of the invention. For example, multiple portable radiation detectors 11 may be provided in a radiography room.

The above-described description and illustrations are a detailed explanation of the parts related to the technology of the present disclosure and are merely an example of the technology of the present disclosure. For example, the above description of the configuration, functions, actions, and effects is an explanation of an example of the configuration, functions, actions, and effects of the parts related to the technology of the present disclosure. Therefore, it goes without saying that unnecessary parts may be deleted, new elements may be added, or substitutions may be made to the above-described description and illustrations, as long as they do not deviate from the gist of the technology of the present disclosure. Furthermore, to avoid confusion and facilitate understanding of the parts related to the technology of the present disclosure, the above-described description and illustrations omit explanations of common technical knowledge that do not require particular explanation to enable the implementation of the technology of the present disclosure.

In this specification, "A and/or B" is synonymous with "at least one of A and B." In other words, "A and/or B" means that it could be just A, just B, or a combination of A and B. Furthermore, in this specification, the same concept as "A and/or B" applies when three or more things are expressed connected by "and/or."

All publications, patent applications, and technical standards mentioned in this specification are incorporated by reference herein to the same extent as if each individual publication, patent application, and technical standard was specifically and individually indicated to be incorporated by reference.

Claims (7)

an imaging stand that houses a portable radiation detector that detects radiation and outputs a radiation image;
an ultraviolet light source provided inside the imaging table and emitting ultraviolet light;
an ultraviolet light source control unit that controls the operation of the ultraviolet light source;
a detection unit that detects whether the portable radiation detector is housed inside the imaging table;
Equipped with
The imaging table is
a tray on which the portable radiation detector is detachably placed;
a holder in which the tray is disposed so as to be insertable and removable;
The detection unit
a first sensor that detects whether the portable radiation detector is attached to the tray;
a second sensor that detects whether the tray is inserted into the holder;
when the first sensor detects that the portable radiation detector has been attached to the tray and the second sensor detects that the tray has been inserted into the holder, emitting the ultraviolet light from the ultraviolet light source;
when the first sensor detects that the portable radiation detector has been removed from the tray, the ultraviolet light is not emitted by the ultraviolet light source;
Radiation diagnostic equipment. The radiological diagnostic device of claim 1, wherein the ultraviolet light source control unit causes the ultraviolet light source to stop emitting the ultraviolet light when a preset time has elapsed since the emission of the ultraviolet light began. 3. The radiological diagnostic apparatus according to claim 1, wherein when the second sensor detects that the tray has been pulled out of the holder, the ultraviolet light source does not emit the ultraviolet light. 4. The radiological diagnostic apparatus according to claim 1 , wherein the ultraviolet light source control unit changes at least one of the intensity and wavelength of the ultraviolet light depending on the time of day. an imaging menu receiving unit that receives an imaging menu indicating the content of radiation imaging;
5. The radiological diagnostic apparatus according to claim 1 , wherein the ultraviolet light source control unit changes the sterilization capability of the ultraviolet light in accordance with the imaging menu received by the imaging menu receiving unit. The radiological diagnostic apparatus according to claim 5 , wherein the ultraviolet light source control unit increases the sterilization capability in the case of the imaging menu that does not use the imaging table compared to the case of the imaging menu that uses the imaging table. 7. The radiological diagnostic apparatus according to claim 5 , wherein the ultraviolet light source control unit changes the sterilization capability by changing at least one of the intensity and wavelength of the ultraviolet light.