JP6800720B2 - Radiation imaging equipment, radiography imaging system, radiography equipment control methods and programs - 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.

In medical image diagnosis, a radiation image detector (radiation imaging device) is used in which a radiation generator irradiates a subject with radiation, detects the intensity distribution of the radiation transmitted through the subject, and generates a radiation image.

In the conventional radiation image detector, a radiation image detector having a sensor array in which pixels including a conversion element for converting radiation into electric charge and a switch element are arranged two-dimensionally is known. Then, the radiation image detector accumulates the electric charge converted by the conversion element in each pixel, drives the switch element to read out the electric charge of each pixel, and generates a radiation image.

Each pixel on the sensor array generates some charge even in the absence of radiation. This charge is called a dark charge here. The dark charge is superimposed on the signal charge due to irradiation, causing non-uniform artifacts in the image. In addition, the magnitude of the dark charge changes depending on the temperature of the sensor array. That is, the generated artifacts also change depending on the temperature of the sensor array.

Patent Document 1 discloses a temperature control operation that generates additional heat in addition to the photographing operation in order to prevent deterioration of image quality by reducing temperature fluctuations when the frame rate is changed.

Japanese Unexamined Patent Publication No. 2016-95278

However, the technique described in Patent Document 1 does not consider the case where the radiographic image detector is driven by using a finite power source such as a battery. In recent years, many highly portable wireless type radiographic image detectors have become widespread, and it is desired that the shooting time when a battery is used can be as long as possible.

An object of the present invention is to improve the convenience of the user by appropriately controlling the radiation detection unit according to the power supply method in consideration of the shootable time when the battery power is supplied.

In order to achieve the above object, the radiography apparatus according to one aspect of the present invention has the following configuration. That is,
It is a radiography device that has a radiation detector that converts the radiation that has passed through the subject into electric charges and can supply power from a battery.
Judgment means for determining the presence or absence of power supply from an external power source,
It has a control means for controlling the drive of the radiation detection unit, and has.
Wherein, when there is power supply from the external power source, the driving of the radiation detection section is controlled in the first mode of implementing the driving movement for maintaining the temperature of the radiation imaging apparatus, the external When power is not supplied from the power source and power is supplied from the battery, the drive of the radiation detection unit is controlled in a second mode in which the drive for maintaining the temperature is not performed. To do.

According to the present invention, it is possible to improve the convenience of the user by appropriately controlling the radiation detection unit according to the power supply method in consideration of the shootable time at the time of battery power supply.

The figure which shows the structure of the radiography system which concerns on 1st Embodiment. The hardware block diagram of the radiation image detector which concerns on 1st Embodiment. The figure which shows two drive sequences which differ in a moving image frame rate. The figure which shows two drive sequences which differ in a moving image frame rate when the drive for preventing a temperature fluctuation which concerns on 1st Embodiment is performed. The block diagram of the power-source part of the radiation image detector which concerns on 1st Embodiment. The block diagram of the apparatus control part of the radiation image detector which concerns on 1st Embodiment. The figure which shows the moving image drive sequence of the case of the external power supply and the case of the power supply by a battery which concerns on 1st Embodiment. The flowchart which shows the procedure of the process which concerns on 1st Embodiment. The figure which shows the still image drive sequence in the case of the external power supply and the case of the power supply by a battery which concerns on 2nd Embodiment. The flowchart which shows the procedure of the process which concerns on 2nd Embodiment. The figure which shows the structure of the radiation image detector which concerns on 3rd Embodiment. The figure which shows the moving image drive sequence which concerns on 3rd Embodiment. The figure which shows an example of the temperature gradient for control of the temperature constant drive which concerns on 3rd Embodiment. The figure which shows the moving image drive sequence 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 temperature constant drive is performed when the power is supplied from the external power source, and the temperature is constant when the power is not supplied from the external power source and the power is supplied from the internal battery. A control that does not carry out the conversion drive will be described.

<System configuration>
A configuration example of the radiography system according to the present embodiment will be described with reference to FIG.

The radiographic imaging system includes a radiographic image detector 100 that functions as a radiographic imaging device, a radiation generator 101, a control device 102, an exposure switch 103, a connection device 104, and a relay device 105. When the exposure switch 103 is pressed, the radiation generator 101 receives a signal for irradiating the radiation 114 with the radiation image detector 100 via the connection device 104 and the relay device 105 that mediate the communication. Sends and receives control signals including a shooting synchronization signal for shooting.

The radiation 114 generated by the radiation generator 101 passes through the subject 113 and is irradiated to the radiation image detector 100. The radiation image detector 100 detects the radiation 114 attenuated when passing through the subject 113 as a radiation image. The radiation image taken by the radiation image detector 100 is output to the control device 102 via the relay device 105, and is displayed on the display 102a by the control device 102. The control device 102 is also connected to the radiation generator 101 to control the entire radiography system.

For the connection between the radiation image detector 100 and the relay device 105, at least one of a wired connection via the wired connector 112 and a wireless connection via the wireless access point 106 can be selected. .. In the case of wireless connection, the power consumed by the radiation image detector 100 is supplied by the battery 110 inside the radiation image detector 100.

<Structure of radiation image detector>
As shown in FIG. 1, the radiation image detector 100 includes a radiation detection unit 107, a device control unit 108, a communication unit 109, a battery 110, and a power supply unit 111. The battery 110 may be attached to and detached from the radiation image detector 100. When the wired connector 112 is connected, the power supply unit 111 converts the voltage of the DC power supply converted from the commercial power supply (not shown) by the relay device 105, and communicates with the radiation detection unit 107 and the device control unit 108. Power is supplied to the unit 109. Further, the battery 110 is charged as needed. The battery 110 may be charged using the cradle. When the wired connector 112 is not connected, the power supply unit 111 converts the voltage supplied from the battery 110 and supplies power to the radiation detection unit 107, the device control unit 108, and the communication unit 109.

The radiation detection unit 107 converts the irradiated radiation 114 into an electric charge according to the radiation amount, and also converts the electric charge into a signal (image signal) according to the electric charge under the control of the device control unit 108. The image signal obtained by the radiation detection unit 107 is output to the device control unit 108 as radiation image data. The device control unit 108 has functions such as an offset correction function, a gain correction function, and a defect correction function, and may perform signal processing / image processing on the radiation image data acquired from the radiation detection unit 107. ..

The device control unit 108 outputs the radiation image data to the communication unit 109, and the communication unit 109 outputs the radiation image data to the relay device 105. When the wired connector 112 is connected, the radiographic image data is communicated by wire via the wired connector 112, and when the wired connector 112 is not connected, the radiographic image data is wirelessly transmitted via the wireless access point 106. connect.

The configuration shown in FIG. 1 is an example, and the devices that can be connected to use the radiation image detector 100 are not limited to those shown in the figure. Further, the connection order of the devices is not limited to the one shown in the figure. The method for correcting the obtained radiographic image data is also not limited. Depending on the system, it may not be necessary to permit irradiation of the radiographic image detector 100.

<Hardware configuration of radiation detection unit and device control unit>
Subsequently, with reference to FIG. 2, a hardware configuration example of the radiation detection unit 107 and the device control unit 108 included in the radiation image detector 100 according to the present embodiment will be described. Note that FIG. 2 illustrates only the configurations of the radiation detection unit 107 and the device control unit 108.

The radiation detection unit 107 includes a signal acquisition circuit 202, a drive IC 203, and a plurality of pixels 206 composed of a photoelectric conversion element 204 and a switch element 205. The number of pixels 206 corresponds to the number of pixels of the radiation image detector 100.

The signal acquisition circuit 202 (signal processing unit) is composed of an amplifier IC that amplifies the signal and an ADC (Analog Digital Converter) that converts an analog signal into a digital signal. The drive IC 203 selects and drives a row wiring (line), and turns on the switch element 205 of the pixel 206 connected to the selected row wiring. The image signal (charge) stored in the photoelectric conversion element 204 is output to the row wiring from the pixel 206 in which the switch element 205 is turned on. The image signal output to the column wiring is amplified by the signal acquisition circuit 202 and converted into digital data. Radiation image data is obtained by the drive IC 203 sequentially selecting the row wiring under the control of the device control unit 108 and the signal acquisition circuit 202 digitizing the image signal output to the column wiring.

Further, the pixel 206 also includes an electric charge (hereinafter, referred to as a dark charge) generated without irradiating the pixel 206 with radiation. The dark charge is superimposed on the signal charge due to irradiation, causing non-uniform artifacts in the image. Image processing such as offset correction processing of such artifacts is performed on the captured radiation image data. In the offset correction process, generally, image data acquired in a state where no radiation is applied is used as correction data. In addition, the magnitude of the dark charge can change depending on the temperature. Therefore, fluctuations in the temperature of the radiation detection unit 107 make it more difficult to correct artifacts derived from dark charges. For example, when the correction data is acquired in advance before imaging, it becomes difficult to perform highly accurate correction due to the temperature fluctuation of the radiation detection unit 107 during imaging. Therefore, it is desirable to keep the temperature of the radiation detection unit 107 as constant as possible. The configuration shown in FIG. 2 is an example and is not limited to this.

The signal acquisition circuit 202 has different power consumption depending on whether a series of operations of converting an analog signal into a digital signal and transmitting the digital signal to the device control unit 108 is performed or not, and the amount of heat generated is different. Is also different.

The device control unit 108 includes a CPU 207, an FPGA 208 (Field-Programmable Gate Array), and a memory 209 including a ROM and / or a RAM. In the device control unit 108, the CPU 207 executes the program stored in the memory 209, and the FPGA 208 realizes the processing operation.

<Drive sequence>
Next, FIG. 3 shows an example of two drive sequences having different moving image frame rates. As a sequence at the first moving image frame rate (time between frames T1), a frame 301, a shooting synchronization signal 302, an irradiation 303, a sensor driving state 304, and a power consumption 305 are shown. Further, as a sequence at the second moving image frame rate (T2 in which the time between frames is longer than T1), the frame 306, the shooting synchronization signal 307, the radiation irradiation 308, the sensor driving state 309, and the power consumption 310 are included. It is shown.

Since the first moving image frame rate has a longer read time per unit time than the second moving image frame rate, the power consumption per unit time is large. Therefore, the amount of heat generated differs between the first moving image frame rate and the second moving image frame rate, and the temperature fluctuation of the radiation image detector 100 occurs by switching the moving image frame rate. Further, when the radiation image detector 100 has drive modes in which the read times of the sensor drive state 304 and the sensor drive state 309 are different from each other, the temperature of the radiation image detector 100 fluctuates due to the switching of the drive modes.

<Temperature constant drive sequence>
On the other hand, FIG. 4 shows two drive sequences having different moving image frame rates when the drive for preventing the temperature fluctuation according to the present embodiment is performed. As a sequence at the first moving image frame rate (time between frames T1), a frame 401, a shooting synchronization signal 402, an irradiation 403, a sensor driving state 404, and a power consumption 405 are shown. Further, as a sequence at the second moving image frame rate (T2 in which the time between frames is longer than T1), the frame 406, the shooting synchronization signal 407, the radiation irradiation 408, the sensor drive state 409, and the power consumption 410 are included. It is shown.

The difference from FIG. 3 is that the signal acquisition circuit 202 is made to perform analog-to-digital conversion and digital signal transmission (hereinafter, referred to as temperature constant drive) even during charge accumulation. At this time, since the switch element 205 is not operated, the charge accumulation of the pixel 206 is maintained. Even during charge accumulation, the signal acquisition circuit 202 is driven to suppress fluctuations in power consumption due to the difference between the sensor drive state 404 and the sensor drive state 409, thereby keeping the heat generation amount of the signal acquisition circuit 202 constant and high definition. Images can be created. Further, even when the radiation is not irradiated, by repeating the same driving, it is possible to stand by in a state where the temperature fluctuation is suppressed.

<Structure of power supply unit>
In the present embodiment, the use of the temperature constant drive is controlled depending on whether the power supply to the radiation image detector 100 is performed from the outside through the wired connector 112 or internally by the battery 110. FIG. 5 shows a configuration example of the power supply unit 111 according to the present embodiment. The power supply unit 111 includes a power supply monitoring circuit 501, a booster circuit 502, a charge / discharge control circuit 503, and DC / DC converters 504, 505, and 506.

When the wired connector 112 is connected and power is supplied to the radiation detector 100 from the outside, the voltage is lowered by the cable loss from the relay device 105 to the radiation image detector 100 in the booster circuit 502 via the power supply monitoring circuit 501. The voltage is boosted to the desired voltage. The boosted voltage is converted into the required voltage by the DC / DC converters 504, 505, and 506, and power is supplied to the device control unit 108, the communication unit 109, and the radiation detection unit 107, respectively.

If the battery 110 is not sufficiently charged, the charge / discharge control circuit 503 charges the battery 110. When the wired connector 112 is not connected and power is not supplied to the radiation detector 100 from the outside, the power stored in the battery 110 is controlled by the charge / discharge control circuit 503 to power the DC / DC converters 504, 505, and 506. Is supplied. The DC / DC converters 504, 505, and 506 supply electric power to the device control unit 108, the communication unit 109, and the radiation detection unit 107, respectively, in the same manner as when power is supplied from the outside. Further, the power supply monitoring circuit 501 monitors the presence / absence of power supply from the outside, and transmits the external supply presence / absence signal 507 to the device control unit 108.

<Structure of device control unit and communication unit>
Subsequently, FIG. 6 shows an outline of the functions of the device control unit 108 according to the present embodiment and an example of the configuration of the communication unit 109. The FPGA 208 inside the device control unit 108 has a drive control unit 601, an image acquisition control unit 604, an image processing unit 605, a power supply monitoring / reception unit 606, and a communication control unit 607 as functional modules. The communication unit 109 includes a wired transmission / reception circuit 608 and a wireless transmission / reception circuit 609.

The drive control unit 601 includes a detection control unit 602 and a temperature control unit 603. The detection control unit 602 drives the radiation detection unit 107 to acquire a radiation image. At this time, the temperature control unit 603 switches the temperature constant drive according to the external supply presence / absence signal 507 received by the power supply monitoring / reception unit 606. The image acquisition control unit 604 stores the acquired radiation image as an image 610 in the memory 209. At this time, a plurality of images may be stored in the memory 209.

The image processing unit 605 performs image correction processing based on functions such as an offset correction function, a gain correction function, and a defect correction function. The power supply monitoring / receiving unit 606 receives an external supply presence / absence signal 507 from the power supply monitoring circuit 501. The communication control unit 607 controls the operation of the communication unit 109. The image 610 processed by the image processing unit 605 is output to the communication unit 109 by the communication control unit 607. At this time, the communication control unit 607 selectively controls the wired transmission / reception circuit 608 and the wireless transmission / reception circuit 609 according to the usage pattern of the radiation image detector 100, and transfers the image to the relay device 105.

<Video sequence>
FIG. 7 shows a moving image sequence when power is supplied from the outside and a moving image sequence when power is supplied from the battery. As a moving image sequence when power is supplied from the outside, a frame 701, a shooting synchronization signal 702, a radiation irradiation 703, a sensor driving state 704, and a power consumption 705 are shown. Further, as a moving image drive sequence when power is supplied from the battery 110, a frame 706, a shooting synchronization signal 707, a radiation irradiation 708, a sensor drive state 709, and a power consumption 710 are shown.

When power is supplied from the outside, temperature fluctuation is suppressed by performing temperature constant drive, and control is performed to create a higher-definition image. As a result, deterioration of image quality can be suppressed even when, for example, an image for offset correction is acquired before shooting. On the other hand, in the case of power supply from the battery 110, the temperature constant drive is stopped. As a result, the power consumption can be reduced and the operation can be performed for a longer period of time.

<Processing>
FIG. 8 is a flowchart showing a procedure of processing performed by the radiographic image detector 100 according to the present embodiment. The power of the radiation image detector 100 is turned on (S801). The device control unit 108 confirms the external supply presence / absence signal 507 output from the power supply monitoring circuit 501 of the power supply unit 111, and determines the presence / absence of power supply from the outside (S802). If power is supplied from the outside, the process proceeds to S803. On the other hand, when power is not supplied from the outside, that is, when the radiation image detector 100 is operated by the battery 110, the process proceeds to S804.

The drive control unit 601 of the device control unit 108 controls the operation of the radiation image detector 100 in a constant temperature drive (S803). The drive control unit 601 of the device control unit 108 controls the operation of the radiation image detector 100 without using the constant temperature drive (S804).

As described above, in the present embodiment, when the electric power is supplied from the external power source, the temperature constant drive is performed to suppress the temperature fluctuation of the radiation detection unit and reduce the deterioration of the image quality. On the other hand, when the power is not supplied from the external power source and the power is supplied from the internal battery, it is prioritized to prevent the decrease in the shootable time by performing the control not to execute the temperature constant drive. As described above, in the present embodiment, in the radiation photographing apparatus capable of supplying power by the internal battery, the drive control of the radiation detecting unit at the time of moving image is changed according to the method of power supply. As a result, it is possible to reduce the deterioration of the image quality as much as possible and prevent the shooting time from being reduced when the internal battery is supplied, so that the convenience of the user can be improved.

(Second Embodiment)
<Overview>
In the second embodiment, when a still image is acquired, if power is supplied from an external power source, the temperature constant drive is performed even during standby (shooting standby state) in which still image shooting is not performed, and power is supplied from the external power source. A control in which the temperature constant drive is not performed during standby when the power is not supplied will be described.

<Drive sequence>
FIG. 9 is a drive sequence at the time of still image acquisition according to the present embodiment. The configuration of the radiography system is the same as that of the first embodiment. As a still image sequence when power is supplied from the outside, a shooting request 901, a radiation irradiation 902, a sensor driving state 903, and a power consumption 904 are shown. Further, as a still image sequence when power is supplied from the battery 110, a shooting request 905, a radiation irradiation 906, a sensor driving state 907, and a power consumption 908 are shown.

When power is supplied from the outside, as shown in the sensor drive state 903, by performing the same temperature constant drive as in the moving image sequence of the first embodiment even during standby, when shifting from standby to shooting. It is possible to reduce the temperature fluctuation of.

On the other hand, when the electric power is supplied from the battery 110, as shown in the sensor drive state 907, the standby state is set in which the temperature constant drive is stopped during the standby state. As a result, it is possible to reduce the power consumption and switch to a drive capable of operating for a long time as compared with the case where the constant temperature drive is continued.

<Processing>
FIG. 10 is a flowchart showing a procedure of processing performed by the radiographic image detector 100 according to the present embodiment. The power of the radiation image detector 100 is turned on (S1001). The device control unit 108 confirms the external supply presence / absence signal 507 output from the power supply monitoring circuit 501 of the power supply unit 111, and determines the presence / absence of power supply from the outside (S1002). If power is supplied from the outside, the process proceeds to S1003. On the other hand, when power is not supplied from the outside, that is, when the radiation image detector 100 is operated by the battery 110, the process proceeds to S1004.

The drive control unit 601 of the device control unit 108 controls the radiation image detector 100 to stand by in a constant temperature drive (S1003). The drive control unit 601 of the device control unit 108 controls the radiation image detector 100 to stand by (standby in the standby state) without using the constant temperature drive (S1004).

Subsequently, the device control unit 108 controls the communication unit 109 to confirm whether or not a photographing request is made in response to the pressing of the exposure switch 103 (S1005). When a shooting request is made, an image is taken (S1006). On the other hand, if there is no shooting request, the process returns to S1002. After shooting, it is confirmed whether the shooting is completed or the shooting is continued (S1007). The case of ending the imaging may be, for example, the case where the power of the radiation image detector 100 is turned off or the imaging end button (not shown) is pressed. If shooting is continuously performed, the process returns to S1005.

As described above, in the present embodiment, when the still image is acquired, when the power is supplied from the external power source, the temperature constant drive is performed even during the standby without taking the still image, so that the still image is in the standby state. It suppresses temperature fluctuations in the radiation detector and reduces deterioration of image quality. On the other hand, when power is not supplied from the external power supply and power is supplied from the internal battery, it is possible to prevent a decrease in the shootable time by performing control that does not perform constant temperature drive during standby. Prioritize. As described above, in the present embodiment, in the radiography apparatus capable of supplying power by the internal battery, the drive control of the standby radiation detection unit is changed according to the power supply method. As a result, it is possible to reduce the deterioration of the image quality as much as possible and prevent the shooting time from being reduced when the internal battery is supplied, so that the convenience of the user can be improved.

(Third Embodiment)
<Overview>
In the third embodiment, the control of monitoring the temperature of the radiation detection unit and changing the temporal ratio of performing the temperature constant drive according to the temperature change (temperature gradient) will be described.

<Composition>
FIG. 11 shows a configuration example of the radiographic image detector according to the present embodiment. The configuration of the radiography system is the same as that of the first embodiment. However, the radiation image detector 100 according to the present embodiment further includes a temperature sensor 1101 that detects the temperature of the radiation detection unit 107 in addition to the configuration shown in FIG. Further, the temperature control unit 603 included in the device control unit 108 according to the present embodiment switches the temperature constant drive according to the external supply presence / absence signal 507 received by the power supply monitoring / reception unit 606. Further, the change in temperature of the radiation detection unit 107, which is the detection result of the temperature sensor 1001, is monitored. Then, the device control unit 108 further controls the switching of the temperature constant drive based on the change in the temperature of the radiation detection unit 107.

<Video sequence>
FIG. 12 shows an example of a moving image sequence according to the present embodiment. The temperature of the radiation detection unit 107 is monitored by the temperature sensor 1101, and the execution rate of the temperature constant drive is changed according to the temperature gradient. When the temperature drops, the rate of constant temperature drive is increased in order to increase power consumption. On the contrary, when the temperature rises, the ratio of the temperature constant drive is reduced in order to reduce the power consumption.

Specifically, as shown in FIG. 13, the value of the temperature gradient (T2-T1) / (t2-t1) is calculated. In the illustrated example, the value is a positive value. That is, since the temperature of the radiation detection unit 107 is raised by driving the radiation image detector 100, the rate of performing the temperature constant drive is reduced during the period of t2-t1. On the other hand, when the value of the temperature gradient (T2-T3) / (tn−tn + 1) is calculated, the value is a negative value in the illustrated example. That is, since the temperature of the radiation detection unit 107 is decreasing, the execution rate of the temperature constant drive is increased during the period of tun−tn + 1.

Further, the execution rate of the temperature constant drive may be adjusted according to the magnitude of the numerical value of the temperature gradient. For example, the more the temperature gradient is positive and the larger the temperature gradient is, the less the temperature constant drive is executed, and the more the temperature gradient is negative and the larger the absolute value is, the more the temperature constant drive is executed. May be good.

As described above, in the present embodiment, the temperature of the radiation detection unit is monitored, and control is performed to change the temporal ratio of performing the temperature constant drive according to the temperature change (temperature gradient). As a result, the temperature of the radiation detection unit can be kept constant, and deterioration of image quality can be reduced.

(Fourth Embodiment)
<Overview>
In the fourth embodiment, when the temperature constant drive is performed while charging the battery with an external power source, the temperature constant drive implementation ratio is adjusted in consideration of the temperature rise due to the increase in power consumption due to the battery charge. The control to be performed will be described.

<Video sequence>
FIG. 14 shows an example of a moving image sequence according to the present embodiment. The configuration of the radiographic imaging system and the configuration of the radiographic image detector 100 are the same as those in the third embodiment. Reference numeral 1401 indicates the relationship between the sensor state and the power consumption regarding the moving image drive when the power is supplied from the external power source. Reference numeral 1402 indicates the relationship between the sensor state and the power consumption in the case where the power is supplied from an external power source and the battery is charged and the moving image is driven. Reference numeral 1403 indicates the relationship between the sensor state and the power consumption in the battery charge drive according to the present embodiment. As shown in 1402, when the battery is charged by the electric power supplied from the external power source, the total power consumption is increased by the amount of the electric power consumed according to the charging, which leads to an increase in temperature. Therefore, in the present embodiment, as shown in 1403, the implementation rate of the temperature constant drive is reduced in order to reduce the amount of power consumption that has increased with charging.

As a result, it is possible to align the generated heat during shooting and during warm-up operation accompanied by battery charging, and it is possible to suppress temperature changes and reduce deterioration of image quality.

(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.

100: Radiation image detector, 101: Radiation generator, 102: Control device, 103: Exposure switch, 104: Connection device, 105: Relay device, 106: Wireless access point, 107: Radiation detector, 108: Device control Unit, 109: Communication unit, 110: Battery, 111: Power supply unit, 112: Wired connector, 113: Subject, 114: Radiation, 202: Signal acquisition circuit, 203: Drive IC, 204: Photoelectric conversion element, 205: Switch element , 206: Pixel, 207: CPU, 208: FPGA, 209: Memory, 501: Power supply monitoring circuit, 502: Booster circuit, 503: Charge / discharge control circuit, 504: DC / DC converter, 505: DC / DC converter, 506 : DC / DC converter, 507: External supply presence / absence signal, 601: Drive control unit, 602: Detection control unit, 603: Temperature control unit, 604: Image acquisition control unit, 605: Image processing unit, 606: Power supply monitoring / reception unit , 607: Communication control unit, 608: Wired transmission / reception circuit, 609: Wireless transmission / reception circuit, 1101: Temperature sensor

Claims (14)

It is a radiography device that has a radiation detector that converts the radiation that has passed through the subject into electric charges and can supply power from a battery.
Judgment means for determining the presence or absence of power supply from an external power source,
It has a control means for controlling the drive of the radiation detection unit, and has.
Wherein, when there is power supply from the external power source, the driving of the radiation detection section is controlled in the first mode of implementing the driving movement for maintaining the temperature of the radiation imaging apparatus, the external When power is not supplied from the power source and power is supplied from the battery, the drive of the radiation detection unit is controlled in a second mode in which the drive for maintaining the temperature is not performed. Radiation imaging device. The radiation detection unit converts an analog signal based on the accumulated charge into a digital signal, and then converts it into a digital signal.
It has a signal processing unit that performs an operation of transmitting the digital signal to the outside of the radiation detection unit.
The first aspect of the present invention, wherein the control means drives the signal processing unit to maintain the temperature while the radiation detection unit is accumulating charges. Radiation imaging device. When shooting a moving image, the control means controls the drive of the radiation detection unit in the first mode when there is power supply from the external power source, and power is not supplied from the external power source. The radiographing apparatus according to claim 1 or 2, wherein when power is supplied from the battery, the driving of the radiation detecting unit is controlled in the second mode. In the shooting standby state, the control means controls the drive of the radiation detection unit in the first mode when power is supplied from the external power source, and the battery is not supplied with power from the external power source. The radiography apparatus according to any one of claims 1 to 3, wherein the drive of the radiation detection unit is controlled in the second mode when electric power is supplied from the radiation detection unit. Further equipped with a temperature sensor for detecting the temperature of the radiography apparatus,
The radiography apparatus according to any one of claims 1 to 4, wherein the control means controls the execution of driving for maintaining the temperature based on the detection result of the temperature sensor. The control means according to claim 5, wherein the control means calculates a temperature gradient based on the detection result of the temperature sensor, and controls the execution of driving for maintaining the temperature according to the temperature gradient. Radiation imaging device. The radiography apparatus according to claim 6, wherein the control means controls to reduce the execution rate of the drive for maintaining the temperature when the temperature gradient is a positive value. The radiography apparatus according to claim 7, wherein the control means performs control in which the larger the positive value is, the greater the reduction in the execution rate of the drive for maintaining the temperature. The control means according to any one of claims 6 to 8, wherein when the temperature gradient is a negative value, the control means controls to increase the execution rate of the drive for maintaining the temperature. Radiation imaging device. The radiographing apparatus according to claim 9, wherein the control means performs control in which the larger the absolute value of the negative value is, the greater the rate of execution of driving for maintaining the temperature is performed. When the battery is being charged by supplying power from the external power source, the control means is driven to maintain the temperature so as to reduce the increase in power consumption associated with the charging of the battery. The radiographing apparatus according to any one of claims 1 to 10, wherein the control for reducing the ratio is performed. The radiography apparatus according to any one of claims 1 to 11.
A radiation generator that generates radiation to irradiate the radiographer,
A control device that controls the radiography device and the radiation generator,
A radiography system characterized by being equipped with. It is a control method of a radiography device that has a radiation detector that converts the radiation that has passed through the subject into electric charges and can supply power from a battery.
Judgment process to determine the presence or absence of power supply from an external power source,
If there is power supply from the external power source, a first control step of controlling the driving of the radiation imaging device in the first mode of implementing the driving movement for maintaining the temperature of the radiation imaging apparatus,
A second mode for controlling the drive of the radiation detection unit in a second mode in which the drive for maintaining the temperature is not performed when the power is not supplied from the external power source and the power is supplied from the battery. Control process and
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 11.

Images