Radiographic system, radiographic device, method of operating radiographic system, method of operating radiographic device, and program

Abstract

To provide a radiographic system that enables imaging with reduced effects on the image due to non-contact power supply, even in the absence of communication means between a power receiving device and a power supply device other than non-contact power supply.SOLUTION: A radiographic system comprises: a radiographic device comprising a sensor unit that detects radiation and outputs image data corresponding to the detected radiation and a power receiving unit that receives power non-contactly; and a power supply device that performs non-contact power supply to the radiographic device. The power receiving unit transmits a pause signal containing information indicative of a stop period, including the read-out time of the image data of the radiographic device, to the power supply device. The power supply device stops power supply during the stop period based on the pause signal, and resumes power supply after the stop period has elapsed.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present disclosure relates to a radiation imaging system, a radiation imaging device, a method of operating a radiation imaging system, a method of operating a radiation imaging device, and a program.

Background Art

[0002] Conventionally, a radiation imaging device that irradiates a subject with radiation emitted from a radiation source and detects the intensity distribution of the radiation transmitted through the subject and converts it into an image, and a radiation imaging system including the radiation imaging device have been commercialized. Radiation imaging devices using an electrical method operate by receiving power required for operation from an internal power source, an external power source, or both. Also, in a form where the radiation imaging device receives power from an external power source, contact power supply may be used to receive power through contact with a conductive member such as a connector provided on the surface of the radiation imaging device body as a supply path. On the other hand, non-contact power supply that receives power through an external electromagnetic field change may also be used.

[0003] There are two methods of non-contact power supply: the electromagnetic induction (MI) method and the magnetic resonance (MR) method. In the MI method, currently, the standard "Qi" established by the Wireless Power Consortium (WPC) is the mainstream.

[0004] In addition, when the radiation imaging device is equipped with a power receiving mechanism by non-contact power supply, the non-contact power supply operation may have an adverse effect on the operation of the radiation imaging device. For example, when non-contact power supply is performed while the radiation imaging device is irradiating radiation and the charges detected by the radiation detector are being A / D (Analog / Digital) converted, it is conceivable that the change in the electromagnetic field due to the non-contact power supply operation is superimposed on the image and degrades the image quality.

[0005] Patent Documents 1 and 2 disclose that, in order for such non-contact power supply not to affect the operation of the radiation imaging apparatus, non-contact power supply is stopped from the start of imaging until the A / D conversion of the charge detected by the radiation detector is completed.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] When performing power supply by non-contact power supply, if compliant with the Qi standard, the power receiving device receives power from the power supply device and operates. Therefore, when power supply is not being performed, the power receiving device cannot send an instruction to start power supply to the power transmission side. For this reason, in the methods disclosed in Patent Documents 1 and 2 that transmit a power supply permission signal in a state where power supply is not being performed, communication other than non-contact power supply between the power receiving device and the power supply device is required to resume power supply. Therefore, in the methods disclosed in Patent Documents 1 and 2, in a system that does not have communication between the power receiving device and the power supply device other than non-contact power supply, if power supply is stopped, power supply may not resume, or the power supply device may start power supply at an unintended timing on the power receiving side.

[0008] Therefore, in one embodiment of the present disclosure, an object is to provide a radiation imaging system capable of performing imaging that suppresses the influence on an image by non-contact power supply even when there is no communication means between the power receiving device and the power supply device other than non-contact power supply.

Means for Solving the Problems

[0009] A radiation imaging system according to an embodiment of the present disclosure includes a radiation imaging device including a sensor unit that detects radiation and outputs image data corresponding to the detected radiation, and a power receiving unit that performs non-contact power reception, and a power supply device that supplies power to the radiation imaging device in a non-contact manner. The power receiving unit transmits a pause signal including information indicating a pause period including a readout time of the image data of the radiation imaging device to the power supply device. The power supply device stops the power supply during the pause period based on the pause signal and resumes the power supply after the pause period has elapsed.

Effect of the Invention

[0010] According to an embodiment of the present disclosure, even when there is no communication means between the power receiving device and the power supply device other than non-contact power supply, it is possible to perform imaging with reduced influence of non-contact power supply on the image.

Brief Description of the Drawings

[0011]

Figure 1

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Figure 7B

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Figure 11A

Figure 11B

Figure 12

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Figure 13B

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Figure 16

Modes for Carrying Out the Invention

[0012] Specific embodiments of the present disclosure will be described below with reference to the drawings. However, the dimensions, materials, shapes, and relative positions of components described in the following embodiments are arbitrary and can be changed depending on the configuration of the device to which the present disclosure is applied or various conditions. In the following description and drawings, common symbols are used for components that are common across multiple drawings. Therefore, common components will be described with mutual reference to multiple drawings, and descriptions of components with common symbols will be omitted as appropriate. Note that radiation includes α-rays, β-rays, and γ-rays, which are beams created by particles (including photons) emitted by radioactive decay, as well as beams with similar or higher energy, such as X-rays, particle beams, and cosmic rays.

[0013] In the following, a contactless power supply method based on the Qi standard defined by the WPC will be described as an example. However, the contactless power supply method used in the present disclosure is not limited to this. The contactless power supply method used in the present disclosure may be a method in which the power receiving unit and the power supply device can communicate with each other in contactless power supply, the power receiving unit can transmit a power supply temporary stop signal including information indicating the power supply stop period to the power supply device, and the power supply device can stop and resume power supply based on the signal. Note that communication in contactless power supply may be, for example, backscatter communication.

[0014] (First embodiment) Hereinafter, a radiation imaging apparatus and a radiation imaging system having a contactless power supply function, an operation method of a radiation imaging apparatus, and an operation method of a radiation imaging system according to a first embodiment of the present disclosure will be described with reference to FIGS. 1 to 6.

[0015] In the radiographic imaging apparatus according to this embodiment, during the pre-reading, accumulation, and main reading operations of the sensor unit, power supply from the contactless power supply device is temporarily stopped without performing communication between the power receiving device and the power supply device other than the contactless power supply, thereby suppressing the influence on image quality of noise caused by the contactless power supply.

[0016] FIG. 1 is a block diagram showing a configuration example of a radiation imaging system 100 according to the present embodiment. The radiation imaging system 100 includes an X-ray generator 101, an X-ray control device 102, a control computer 103, a communication unit 104, an X-ray imaging device 105, a non-contact power supply device 120, and a contact power supply device 121.

[0017] The X-ray generator 101 is an example of a radiation generator and includes a radiation source such as an X-ray tube. The X-ray generator 101 irradiates X-rays (radiation) under the control of the X-ray control device 102.

[0018] The X-ray control device 102 controls the X-ray generator 101. For example, when the X-ray control device 102 receives an irradiation permission signal from the computer 103, it controls the X-ray generator 101 to irradiate X-rays.

[0019] The computer 103 controls the X-ray control device 102 and the X-ray imaging device 105. The computer 103 communicates with the X-ray imaging device 105 via the communication unit 104 and controls the operation of the X-ray imaging device 105. For example, the computer 103 can control the driving of the X-ray imaging device 105 and the acquisition of images by the X-ray imaging device 105. The computer 103 may be a computer provided with a processor and a memory, may be configured by a general computer, or may be configured by a computer dedicated to the radiation imaging system. Note that the computer 103 may be a personal computer (PC), and a desktop PC, a notebook PC, or a tablet PC (portable information terminal) may be used.

[0020] The communication unit 104 can communicate with the X-ray imaging device 105. Wireless communication is preferably used for the communication between the communication unit 104 and the X-ray imaging device 105, and an access point or the like is preferably used for the communication unit 104, but a wired communication configuration may also be used. Further, the communication unit 104 may be built in the computer 103.

[0021] The X-ray imaging apparatus 105 is an example of a radiation imaging apparatus and can be configured using, for example, an FPD (Flat Panel Detector) or the like. The X-ray imaging apparatus 105 is provided with a sensor unit 106, a control unit 107, and a communication unit 108. Further, the X-ray imaging apparatus 105 is provided with a battery 109, a charging circuit unit 110, a non-contact power receiving unit 111 (a power receiving device compliant with the Qi standard), a contact power receiving unit 112, a power supply unit 113, a display unit 114, a memory unit 115, and an image processing unit 116.

[0022] The sensor unit 106 includes a two-dimensional detector that detects X-rays. The sensor unit 106 is a sensor in which elements for detecting X-rays are arranged in an XY matrix array, detects X-rays, and outputs image data corresponding to the detected X-rays. The sensor unit 106 will be described in detail in the description of FIG. 2.

[0023] The control unit 107 controls the operation of the X-ray imaging apparatus 105. For example, the control unit 107 can control the sensor unit 106 and acquire image data corresponding to the X-rays detected by the sensor unit 106. Further, the control unit 107 can send the image data to the image processing unit 116 and acquire the image data subjected to image processing. In addition, the control unit 107 can control the non-contact power receiving unit 111, the contact power receiving unit 112, etc., and control the power receiving process etc. of the X-ray imaging apparatus 105.

[0024] More specifically, the control unit 107 can control the sensor unit 106 by the driving method requested from the computer 103. Further, the control unit 107 can control the charging circuit unit 110 based on a determination as to whether or not the contact power supply device 121 is connected to the contact power receiving unit 112. Furthermore, the control unit 107 also controls the display unit 114, the memory unit 115, and the image processing unit 116. For this reason, the control unit 107 can function as an example of a display control unit that controls the display unit 114.

[0025] The communication unit 108 can communicate with the computer 103 via the communication unit 104. As described above, the communication between the communication unit 108 and the communication unit 104 may be wireless or wired. The communication unit 108 may be provided with any communication interface depending on the desired configuration.

[0026] The battery 109 is detachable and replaceable, and has a capacity sufficient to capture an image one or more times. The X-ray imaging device 105 can be operated by power supplied from the battery 109. The battery 109 may be, for example, a lithium ion battery, but other types of batteries may also be used.

[0027] Charging circuit unit 110 converts the power supply voltage from non-contact power receiving unit 111 or contact power receiving unit 112 as needed, and charges battery 109 with a voltage according to the type of battery 109. Charging circuit unit 110 has a current limiting function and can limit the charging current to battery 109. Charging circuit unit 110 can also convert the power supply voltage from non-contact power receiving unit 111 or contact power receiving unit 112 as needed, and supply it to power supply unit 113.

[0028] The power supply unit 113 supplies power to the X-ray imaging device 105. The power supply unit 113 converts voltage and supplies power to the sensor unit 106, the control unit 107, the communication unit 108, the display unit 114, the memory unit 115, and the image processing unit 116. The power supply unit 113 can be configured mainly using circuits such as a DC-DC converter and a series regulator. The circuit that directly receives input from the charging circuit unit 110 is configured with a DC-DC converter with step-up and step-down functions, and can supply power to the subsequent stages effectively even with various input voltages.

[0029] The display unit 114 is a display unit for notifying a user such as a technician of the status of the X-ray imaging apparatus 105. The display unit 114 can be configured using any display element or display such as an LED, an OLED, or an LCD. For example, the control unit 107 can cause the display unit 114 to display that power is being supplied during contactless power supply.

[0030] The memory unit 115 holds the data read from the sensor unit 106 and holds the parameter data. The memory unit 115 may be configured using an arbitrary storage medium such as, for example, a ROM (Read Only Memory), a RAM (Random Access Memory), an optical disk such as a hard disk, or a solid state drive.

[0031] The image processing unit 116 receives the image data output from the sensor unit 106 from the control unit 107 and performs arbitrary image processing on the image data. Note that the image processing unit 116 and the control unit 107 may be realized by a processor executing a software module stored in the memory unit 115. Further, these components may be configured by a circuit or the like that performs a specific function such as an ASIC, or may be configured by a combination of software and a circuit or the like. Here, the processor may be a CPU (Central Processing Unit). Further, the processor may be, for example, an MPU (Micro Processing Unit), a GPU (Graphical Processing Unit), an FPGA (Field-Programmable Gate Array), or the like.

[0032] The non-contact power supply device 120 is a power supply device for supplying power to the X-ray imaging device 105 in a non-contact manner. When the non-contact power supply device 120 comes close to the non-contact power receiving unit 111, it supplies power to the non-contact power receiving unit 111. The non-contact power supply device 120 and the non-contact power receiving unit 111 shall perform non-contact power transmission using an electromagnetic induction method for non-contact power transmission based on the Qi standard defined by WPC. That is, non-contact power transmission based on the Qi standard is performed between the power transmission antenna of the non-contact power supply device 120 and the power receiving antenna of the non-contact power receiving unit 111.

[0033] The contactless power receiving unit 111 and contactless power supply device 120 according to this embodiment communicate for power transmission control based on the Qi standard. The Qi standard defines multiple phases, including a power transfer phase in which power transmission is performed and a phase before actual power transmission, and communication for necessary power transmission control is performed in each phase. The phases before power transmission include a selection phase, a ping phase, an identification and configuration phase, a negotiation phase, and a calibration phase. Note that the identification and configuration phase will be referred to as the I&C phase hereinafter.

[0034] In the Selection phase, the power transmitting device (power supply device) intermittently transmits Analog Pings to detect that an object has been placed on the power transmitting device (for example, that a power receiving device or a conductor piece has been placed on a charging stand). The power transmitting device detects at least one of the voltage and current values of the power transmitting antenna when it transmits Analog Pings, and if the voltage value is below a certain threshold or the current value exceeds a certain threshold, it determines that an object is present and transitions to the Ping phase.

[0035] In the Ping phase, the power transmitting device transmits a Digital Ping, which has a higher power than the Analog Ping. The power of the Digital Ping is sufficient to start up the control unit of the power receiving device placed on the power transmitting device. In other words, the Digital Ping is the power transmitted from the power transmitting device to start up the power receiving device. The power receiving device notifies the power transmitting device of the magnitude of the received voltage. This notification is performed using a Signal Strength Packet defined in the Qi standard. In this way, the power transmitting device recognizes that the object detected in the Selection phase is a power receiving device by receiving a response from the power receiving device that received the Digital Ping. Upon receiving the notification of the received voltage value, the power transmitting device transitions to the I&C phase. In addition, before transmitting the Digital Ping, the power transmitting device measures the Q-factor of the power transmitting antenna. This measurement result is used when performing foreign object detection processing using a Q-factor measurement method.

[0036] In the I&C phase, the power transmitting device identifies the power receiving device and obtains device configuration information (capability information) from the power receiving device. The power receiving device transmits an ID packet and a configuration packet. The ID packet contains the identifier information of the power receiving device, and the configuration packet contains the device configuration information (capability information) of the power receiving device. Upon receiving the ID packet and the configuration packet, the power transmitting device responds with an acknowledgement (ACK, positive response). When the acknowledgement is received, the I&C phase ends.

[0037] In the negotiation phase, the power transmission device and the power reception device determine the value of the power based on the required power of the power reception device, the power transmission capacity of the power transmission device, etc. Also, the power transmission device executes foreign object detection processing using the Q value measurement method in accordance with the request from the power reception device. Further, in the Qi standard, after once shifting to the Power Transfer phase, a method of performing the same processing as in the Negotiation phase again according to the request of the power reception device is defined. The phase of performing these processes after shifting from the Power Transfer phase is called the Renegotiation phase.

[0038] In the Calibration phase, the power transmission device and the power reception device perform calibration based on the Qi standard. Also, the power reception device notifies the power transmission device of a predetermined received power value (the received power value in the light load state / the received power value in the maximum load state), and the power transmission device performs adjustment for efficient power transmission. The received power value notified to the power transmission device can be used for foreign object detection processing by the Power Loss method.

[0039] In the Power Transfer phase, control for starting, continuing, and stopping power transmission due to errors or full charge, etc. is performed. In the Power Transfer phase, while the power transmission device and the power reception device perform real-time control of the transmitted power, control for notifying the charging state, stopping power transmission due to full charge, etc. is performed. Here, real-time control refers to highly immediate control. In the Power Transfer phase, the transmitted power is immediately controlled in response to the request from the power reception device. Thereby, the power reception device can appropriately control the output to, for example, the battery. Note that the real-time control does not necessarily have to be control at exactly the same timing. That is, the transmitted power may be controlled simultaneously with the request from the power reception device, or the transmitted power may be controlled within a certain short period with respect to the request from the power reception device.

[0040] The non-contact power supply device 120 continues to supply power greater than Digital Ping from the start of Digital Ping power transmission until it receives an EPT (End Power Transfer) signal (data) requesting power transmission stop from the non-contact power receiving unit 111.

[0041] The contact power supply device 121 is a power supply device that supplies power to the X-ray imaging device 105 by being electrically connected to the contact power receiving unit 112.

[0042] Taking an example of the flow of X-ray imaging using this system, after the user activates the X-ray imaging device 105, the user operates the computer 103 to make the X-ray imaging device 105 in a shootable state. Subsequently, the user operates the X-ray control device 102 to set imaging conditions (such as tube voltage, tube current, and irradiation time of the X-ray tube) for irradiating X-rays. Note that the user may operate the X-ray control device 102 via the computer 103. After the above processes are completed, the user confirms that the imaging preparation is complete, presses the irradiation switch provided on the X-ray control device 102, and irradiates radiation from the X-ray generator 101. Note that the instruction for radiation irradiation may be transmitted from the computer 103 to the X-ray control device 102 according to the user's instruction.

[0043] During X-ray irradiation, the X-ray control device 102 notifies the X-ray imaging device 105 of a signal (imaging permission signal) indicating that X-rays are about to be irradiated via the computer 103 or the communication unit 104. In the configuration shown in FIG. 1, the X-ray imaging device 105 and the X-ray control device 102 are connected via the computer 103 or the communication unit 104, but the connection is not necessarily limited to this form. For example, the X-ray control device 102 may be configured to directly perform wireless communication or the like with the X-ray imaging device 105.

[0044] When a signal indicating that X-rays are to be irradiated reaches the X-ray imaging device 105, the X-ray imaging device 105 checks whether it is ready for X-ray irradiation, and if there is no problem, transmits an irradiation permission signal to the X-ray control device 102. Thereby, radiation is irradiated.

[0045] When the X-ray imaging apparatus 105 detects the end of X-ray irradiation by various methods such as referring to a notification from the X-ray control apparatus 102 or a preset setting time, it starts generating image data of the X-ray image. The generated image data is sent to the computer 103 through the communication path described above. The image data sent to the computer 103 can be displayed as an X-ray image on, for example, a display unit (not shown) connected to the computer 103. Note that the image can be generated from the top to the bottom or from the left to the right of the image so as to correspond to the matrix order of the pixels from which the image data is read out by the sensor unit 106. Also, the generated image can be displayed in the order of the pixels in which the image data is generated. However, the generation order and display order of the image are not limited to this, and may be appropriately changed according to a desired configuration.

[0046] FIG. 2 shows an example of an equivalent circuit diagram of the detector of the sensor unit 106 according to the present embodiment. In FIG. 2, an FPD having 3 rows × 3 columns of pixels is shown for simplicity of explanation. However, an actual imaging apparatus has more pixels, and for example, a 17-inch imaging apparatus can have about 2800 rows × about 2800 columns of pixels.

[0047] The detection unit 212 is a two-dimensional detector having a plurality of pixels arranged in a matrix. Each pixel has a conversion element 202 (conversion elements S11 to S31) that converts radiation or light into electric charge, and a switch element 201 (switch elements T11 to T33) that outputs an electric signal corresponding to the electric charge.

[0048] In the present embodiment, as a photoelectric conversion element that converts the light irradiated on the conversion element 202 into electric charge, an MIS-type photodiode mainly made of amorphous silicon and arranged on an insulating substrate such as a glass substrate is used, but a PIN-type photodiode may also be used. Further, as the conversion element 202, an indirect-type conversion element provided with a wavelength converter that converts radiation into light in a wavelength band that can be detected by the photoelectric conversion element on the radiation incident side of the above-described photoelectric conversion element, or a direct-type conversion element that directly converts radiation into electric charge is preferably used.

[0049] As the switch element 201, a transistor having a control terminal and two main terminals is preferably used, and in this embodiment, a thin film transistor (TFT) is used. One electrode of the conversion element 202 is electrically connected to one of the two main terminals of the switch element 201, and the other electrode is electrically connected to the bias power supply 203 via a common bias wiring Bs.

[0050] A plurality of switch elements in the row direction, for example, switch elements T11, T12, T13, have their control terminals commonly and electrically connected to the drive wiring G1 in the first row. A drive signal Vg for controlling the conduction state of the switch elements is given to the plurality of switch elements in the row direction in row units via the drive wiring from the shift register 214. The other main terminals of a plurality of switch elements in the column direction, for example, switch elements T11, T21, T31, are electrically connected to the signal wiring Sig1 in the first column. While in the conductive state, the switch elements T11, T21, T31 output an electrical signal corresponding to the charge of the conversion element 202 to the readout circuit 213 via the signal wiring Sig1. The signal wirings Sig1 to Sig3 arranged in a plurality in the column direction transmit the electrical signals output from the plurality of pixels to the readout circuit 213 in parallel.

[0051] The readout circuit 213 is provided with an amplifier circuit 206 for amplifying the electrical signals output in parallel from the detection unit 212 corresponding to each signal wiring. Each amplifier circuit 206 includes an integrating amplifier 205 for amplifying the output electrical signal, a variable amplifier 204 for amplifying the electrical signal from the integrating amplifier 205, and a sample and hold circuit 207 for sampling and holding the amplified electrical signal.

[0052] The integrating amplifier 205 includes an operational amplifier that amplifies and outputs the read electrical signal, an integrating capacitor, and a reset switch. The integrating amplifier 205 can change its amplification factor by changing the value of the integrating capacitor. The output electrical signal is input to the inverting input terminal of the operational amplifier, a reference voltage Vref is input from a reference power supply 211 to the non-inverting input terminal, and the amplified electrical signal is output from the output terminal. An integrating capacitor is disposed between the inverting input terminal and output terminal of the operational amplifier. A sample-and-hold circuit 207 is provided corresponding to each amplifier circuit and is composed of a sampling switch and a sampling capacitor.

[0053] The readout circuit 213 also has a multiplexer 208 that sequentially outputs the electrical signals read out in parallel from each amplifier circuit 206 as a serial image signal. The sensor unit 106 is further provided with a buffer amplifier 209 that performs impedance conversion on the image signal and outputs it, and an A / D converter 210 that converts the image signal into digital image data. The image signal Vout, which is an analog electrical signal output from the buffer amplifier 209, is converted into digital image data by the A / D converter 210 and output to the control unit 107.

[0054] The power supply unit (not shown) includes a reference power supply 211 and a bias power supply 203 of the amplifier circuit 206 shown in FIG. 2. The reference power supply 211 supplies a reference voltage Vref to the non-inverting input terminal of each operational amplifier. The bias power supply 203 supplies a bias voltage Vs commonly to the other electrode of each conversion element via a bias wiring Bs. The shift register 214 outputs drive signals Vg1 to Vg3 having a conductive voltage that turns the switch element 201 into a conductive state or a non-conductive voltage that turns the switch element 201 into a non-conductive state to each drive wiring in response to control signals (D-CLK, OE, and DIO) input from the control unit 107 shown in FIG. 1. In this way, the shift register 214 controls the conductive state and non-conductive state of the switch element 201 to drive the detection unit 212.

[0055] Here, the control signal D-CLK is the shift clock of the shift register 214 used as a driving circuit, the control signal DIO is the pulse transferred by the shift register 214, and OE is the signal for controlling the output terminal of the shift register 214. Also, the shift register 214 enables simultaneous selection of adjacent pixels and determines the presence or absence of simultaneous selection based on the ADD signal. By simultaneously selecting pixels, the substantial pixel size increases, the number of pixels decreases, and high-speed reading can be achieved. With these signals, the control unit 107 can set the required time for driving and the scanning direction.

[0056] Further, the control unit 107 controls the operations of the respective components of the readout circuit 213 by applying the control signal RC, the control signal SH, and the control signal CLK to the readout circuit 213. Here, the control signal RC controls the operation of the reset switch of the integrating amplifier 205, the control signal SH controls the operation of the sample hold circuit 207, and the control signal CLK controls the operation of the multiplexer 208.

[0057] FIG. 3 shows an example of the operation flow of the X-ray imaging apparatus according to the present embodiment and shows an example of the driving timing of the detector. Until the irradiation of X-rays is started, the control unit 107 repeatedly performs preparatory driving for turning on the switch element 201 in order from the top row (row 0) to the bottom row (row Y-1), that is, dummy reading. By causing the sensor unit 106 to perform dummy reading, the control unit 107 can remove the charges accumulated in the pixels due to the dark current and reset the charge accumulation. Hereinafter, the time during which the sensor unit 106 performs dummy reading is referred to as the dummy reading time or the accumulation reset time. When the dummy reading reaches the bottom row, it returns to the top row and continues the dummy reading.

[0058] When the irradiation of X-rays is started, the control unit 107 controls the sensor unit 106 and performs driving for turning off the switch element 201 of all rows, that is, repeatedly causing charge accumulation. The sensor unit 106 repeatedly performs accumulation until the irradiation of X-rays ends. Hereinafter, the time during which the sensor unit 106 accumulates charges is referred to as the accumulation time.

[0059] When the X-ray irradiation ends, the control unit 107 controls the sensor unit 106 to turn on the switching element 201 in order from the first row to the last row, and performs driving for reading out a signal and A / D conversion, that is, performs the main reading. Hereinafter, the time during which the sensor unit 106 performs the main reading is referred to as the main reading time.

[0060] Each pixel of the sensor unit 106 generates a certain amount of signal even in a state where there is no radiation irradiation. This signal is called the dark current here. The dark current has different characteristics for each pixel, and the characteristics also change due to the temperature and aging of the sensor unit 106. Therefore, in image shooting, a method of removing the influence of the dark current on the image by taking the difference in the signals of each pixel when no X-ray is irradiated from the image data can be used. That is, an X-ray image obtained by driving the sensor unit 106 after X-ray irradiation and an image obtained by driving the sensor unit 106 without irradiation (hereinafter referred to as a dark image) are separately acquired, and the X-ray image is corrected by performing subtraction processing between the corresponding pixels of these images to obtain an image of the subject. As described above, in order to prevent a residual removal error from occurring due to a change in the dark current characteristics themselves, it is desirable to acquire the X-ray image and the dark image in close proximity in time, and a method of continuous shooting is preferably used.

[0061] The control unit 107 sends the acquired X-ray image data and dark image data to the image processing unit 116. The image processing unit 116 corrects the X-ray image using the dark image and sends the corrected image to the control unit 107. The control unit 107 transfers the corrected image to the computer 103.

[0062] 4 shows an example of the internal configuration of charging circuit unit 110 according to this embodiment. Charging circuit unit 110 is provided with charging control unit 402 and selector switch 405. Charging control unit 402 determines whether or not power is being supplied from non-contact power receiving unit 111 or contact power receiving unit 112. If power is being supplied, charging control unit 402 converts the power supplied from non-contact power receiving unit 111 or contact power receiving unit 112 into a voltage and current preset by control unit 107, charges battery 109, and supplies power to power supply unit 113. If power is not being supplied, charging control unit 402 causes battery 109 to supply power to power supply unit 113.

[0063] When power is being fed from contact power receiving unit 112, changeover switch 405 is turned off, and turns off the power feed path from contactless power receiving unit 111. On the other hand, when power is not being fed from contact power receiving unit 112, changeover switch 405 is turned on, and turns on the power feed path from contactless power receiving unit 111. In this way, changeover switch 405 can prevent the fed power of contactless power receiving unit 111 and contact power receiving unit 112 from being short-circuited.

[0064] 5 is a flowchart showing an example of a flow of a series of imaging operations by the control unit 107 when contactless power is being supplied to the X-ray imaging device 105 according to this embodiment. In this embodiment, the contactless power supply device 120 is connected to the contactless power receiving unit 111 in a state where the contact power supply device 121 is not connected to the contact power receiving unit 112. As a result, the contactless power receiving unit 111 and the contactless power supply device 120 transition to the Power Transfer phase, and contactless power supply is performed.

[0065] In step S501, the control unit 107 checks whether or not the imaging technique (technique) has been set by the computer 103 and whether or not an imaging preparation completion signal has been transmitted via the communication units 104 and 108. If the imaging preparation completion signal has not been transmitted, the process proceeds to step S501 again. On the other hand, if the imaging preparation completion signal has been transmitted, the control unit 107 causes the sensor unit 106 to start blank reading drive, and the process proceeds to step S502.

[0066] In step S502, the control unit 107 checks the procedure set when the shooting preparation completion signal is sent from the computer 103. The control unit 107 reads from the memory unit 115 the power supply stop period to the non-contact power supply device 120 according to the confirmed procedure, and the process proceeds to step S503.

[0067] Here, the Re-Ping function of the Qi standard will be described. The Re-Ping function is a function in which the non-contact power supply device 120 resumes power supply after the elapse of a specified delay time (Re-Ping Delay, stop period) since the power supply is stopped. The non-contact power receiving unit 111 stores Re-Ping indicating resumption as a reason code in the EPT signal and transmits it to the non-contact power supply device 120. The specified delay time is determined by negotiation in the Negotiation phase between the non-contact power receiving unit 111 and the non-contact power supply device 120. Specifically, this negotiation is realized by the non-contact power receiving unit 111 specifying the desired delay time and the non-contact power supply device 120 permitting or rejecting it. When the non-contact power supply device 120 receives an EPT signal whose reason code is Re-Ping, it stops power supply and resumes power transmission of Digital Ping after the Re-Ping Delay has elapsed. Note that the maximum value of the Re-Ping Delay is defined as 12.6 seconds in the Qi standard.

[0068] In step S503, the control unit 107 checks whether the stop period is greater than 12.6 seconds. Since the maximum value of the Re-Ping Delay is defined as 12.6 seconds in the Qi standard as described above, a value greater than this cannot be set. Since the stop period is set to the non-contact power supply device 120 as the Re-Ping Delay, if the stop period is greater than 12.6 seconds, the main drive cannot be performed. In this case, the process proceeds to step S510. In step S510, the control unit 107 causes the display unit 114 to display an error message indicating that the main drive cannot be performed. Then, the control unit 107 ends the idle drive and ends the series of shooting operations.

[0069] On the other hand, if the stop period is 12.6 seconds or less, the process proceeds to step S504. In step S504, the control unit 107 sets the stop period for the non-contact power supply device 120. Specifically, the control unit 107 causes the non-contact power supply device 120 to transition to the Renegotiation phase and sets the Re-Ping Delay. Here, the non-contact power receiving unit 111 transmits a NEGO data packet, and the non-contact power supply device 120 that receives the packet transmits an ACK response. When the non-contact power receiving unit 111 receives the ACK response, the non-contact power receiving unit 111 and the non-contact power supply device 120 transition to the Renegotiation phase. The set value of the Re-Ping Delay will be described later. After setting the Re-Ping Delay, the control unit 107 causes the non-contact power supply device 120 to transition to the Power Transfer phase, and the process proceeds to step S505.

[0070] In step S505, the control unit 107 checks whether a shooting permission signal has been transmitted from the computer 103. If the shooting permission signal has not been transmitted, the process proceeds to step S509. On the other hand, if the shooting permission signal has been transmitted, the process proceeds to step S506.

[0071] In step S506, the control unit 107 performs shooting. The driving in step S506 will be described later.

[0072] In step S507, the control unit 107 sends the captured image to the image processing unit 116, and the image processing unit 116 performs arbitrary image processing such as correction using a dark image on the captured image. Further, the image processing unit 116 sends the image subjected to the image processing to the control unit 107.

[0073] In step S508, the control unit 107 transfers the image to the computer 103 and checks whether the transfer of the image has been completed. If the transfer of the image has not been completed, the process returns to step S508. On the other hand, if the transfer of the image has been completed, the process proceeds to step S505.

[0074] In step S509, the control unit 107 checks whether a shooting end signal has been transmitted from the computer 103. If the shooting end signal has not been transmitted, the process proceeds to step S505. On the other hand, if the shooting end signal has been transmitted, the control unit 107 terminates the idle drive and ends the series of shooting operations.

[0075] FIG. 6 is a timing chart showing an example of the operations of the sensor unit 106, the X-ray generator 101, and the non-contact power supply device 120 under the control of the control unit 107 in step S506 according to the present embodiment.

[0076] Time t601 is the timing of the power supply stop instruction from the control unit 107 to the non-contact power supply device 120 in step S506. Specifically, the control unit 107 controls the non-contact power receiving unit 111 to transmit an EPT signal with the reason code Re-Ping to the non-contact power supply device 120. Hereinafter, unless otherwise specified, the "power supply stop instruction" means that the non-contact power receiving unit 111 transmits an EPT signal with the reason code Re-Ping. After receiving the EPT signal with the reason code Re-Ping, the non-contact power supply device 120 stops non-contact power supply at the latest after the elapse of the delay time Td. The delay time Td is stored in advance in the memory unit 115, and the control unit 107 can read the delay time Td from the memory unit 115. Note that the delay time Td is a time specific to the non-contact power supply device 120, different from the delay time Re-Ping Delay.

[0077] Time t602 is the timing after the elapse of the delay time Td from time t601, and the power supply of the non-contact power supply device 120 stops between time t601 and time t602. Since the power supply from the non-contact power supply device 120 stops, the control unit 107 sets the charge control unit 402 to supply power from the battery 109 to each block of the X-ray imaging device 105.

[0078] Time t603 is the timing at which the control unit 107 gives a shooting instruction to the X-ray control device 102. The time Tf from time t602 to time t603 is the time during which the sensor unit 106 performs blanking for one frame. That is, after the control unit 107 gives an instruction to stop power supply to the non-contact power supply device 120 in step S506, the control unit 107 gives a shooting instruction after at least the elapse of the delay time Td and the blanking time Tf. By providing the blanking time Tf, it is possible to suppress the influence of the non-contact power supply on the sensor unit 106, particularly the influence on the signal wirings Sig1 to Sig3 that are susceptible to noise. In the present embodiment, a blanking time for one frame is provided from time t602 to time t603, but it is not limited to this, and at least a blanking time for one frame can be provided. For example, a blanking time for three frames may be provided. In that case, the time from time t602 to time t603 is three times Tf.

[0079] In response to the shooting instruction from the control unit 107, the sensor unit 106 performs accumulation driving for an accumulation time Ta from time t603 to a predetermined time t604. At the same time, X-rays are irradiated from the X-ray generator 101. Thereafter, the sensor unit 106 performs main reading driving for a main reading time Tr from time t604 to time t605. Through the operations from time t602 to time t605, the sensor unit 106 acquires an X-ray image.

[0080] Subsequently, for a blanking time Tm from time t605 to time t606, the sensor unit 106 performs blanking driving again. Next, the sensor unit 106 performs accumulation driving again for an accumulation time Ta from time t606 to time t607, and performs main reading driving for a main reading time Tr from time t607 to time t608. Through the operations from time t605 to time t608, the sensor unit 106 acquires a dark image. The non-contact power supply device 120 resumes power supply from time t609. In the present embodiment, a dark image is taken after taking an X-ray image using X-rays, but an X-ray image using X-rays may be taken after taking a dark image.

[0081] The blank reading time Tf, the accumulation time Ta, the main reading time Tr, and the blank reading time Tm can be determined from the confirmation of the procedure in step S502 of FIG. 5 and the number of pixels of the X-ray imaging apparatus 105. By confirming the procedure, since the accumulation time is uniquely determined, the accumulation time Ta is obtained. For example, in the imaging procedure of a thick part such as the trunk of the body like the waist, etc., the accumulation time Ta is set to be long. On the other hand, for example, in the imaging procedure of a moving part such as the lungs or an infant, the accumulation time Ta is set to be short. Also, the blank reading time Tf, the main reading time Tr, and the blank reading time Tm are determined by the size of the imaging part, the D-CLK input to the shift register 214, the conversion speed of the A / D converter 210, and the presence or absence of simultaneous selection of pixels. Therefore, according to the imaging part and the procedure used, parameters such as the size of the aforementioned imaging part and the D-CLK input to the shift register 214 are determined, and the blank reading time Tf, the main reading time Tr, and the blank reading time Tm are obtained. The correspondence relationships such as the size of the imaging part, the accumulation time corresponding to the procedure, and the reading time, etc. are stored in the memory part 115, and the control part 107 can refer to the memory part 115 to read out the blank reading time Tf, the accumulation time Ta, the main reading time Tr, and the blank reading time Tm.

[0082] The Re-Ping Delay set in step S503 of FIG. 5 is set to be a time equal to or longer than the time from time t602 to time t608, which is calculated from the idle reading time Tf, the accumulation time Ta, the main reading time Tr, and the idle reading time Tm. Specifically, the Re-Ping Delay is set to be a time equal to or longer than the time obtained by adding the time Tf (time t602 - time t603), the time Ta (time t603 - time t604), the time Tr (time t604 - time t605), the time Tm (time t605 - time t606), the time Ta (time t606 - time t607), and the time Tr (time t607 - time t608). For example, when the idle reading time Tf = 100 ms, the accumulation time Ta = 1000 ms, the main reading time Tr = 300 ms, and the idle reading time Tm = 200 ms, the time from time t602 to time t608 is 2900 ms. Since the Re-Ping Delay is defined to be set in units of 200 ms, in this case, 3000 ms is set as the Re-Ping Delay. Note that the Re-Ping Delay may be determined by further adding a time Td to the time from time t602 to time t608.

[0083] As described above, the radiation imaging system 100 according to the present embodiment includes an X-ray imaging device 105 and a non-contact power supply device 120. The X-ray imaging device 105 functions as an example of a radiation imaging device and includes a sensor unit 106 and a non-contact power receiving unit 111. The non-contact power supply device 120 functions as an example of a power supply device that supplies power to the radiation imaging device in a non-contact manner. The sensor unit 106 functions as an example of a sensor unit that detects radiation and outputs image data corresponding to the detected radiation. Further, the non-contact power receiving unit 111 functions as an example of a power receiving unit that receives power in a non-contact manner. The non-contact power receiving unit 111 transmits a pause signal including information indicating a pause period including the read time (main read time), accumulation time, and accumulation reset time (blank read time) of the image data of the X-ray imaging device 105 to the non-contact power supply device 120. Here, Re-Ping Delay is an example of information indicating a pause period including the read time of the image data of the X-ray imaging device 105, and the EPT signal of the reason code Re-Ping is an example of a pause signal. The non-contact power supply device 120 stops power supply during the pause period based on the pause signal and resumes power supply after the pause period has elapsed.

[0084] According to such a configuration, in the blank read, accumulation, and main read operations of the sensor unit 106, by temporarily stopping the power supply from the non-contact power supply device 120, it is possible to suppress the influence on the image quality of the sensor unit 106 due to noise from the non-contact power supply. Further, by transmitting a pause signal including a pause period in the non-contact power supply communication from the non-contact power receiving unit 111 to the non-contact power supply device 120, the non-contact power supply device 120 can be made to stop and resume power supply. Therefore, it is possible to resume the power supply from the non-contact power supply device 120 without performing communication other than non-contact power supply.

[0085] In addition, the readout time of the image data can include the readout time of the image data related to the first imaging and the second imaging performed after the first imaging. In this case, the stop period can further include the accumulation time and the accumulation reset time of the X-ray imaging apparatus 105 related to the second imaging. According to such a configuration, by transmitting a pause signal including information indicating the stop period in the non-contact power supply communication to the non-contact power supply device 120, it is possible to suppress the influence on the image quality of the sensor unit 106 due to noise from the non-contact power supply in both the continuous first imaging and the second imaging.

[0086] In addition, the stop period can further include the accumulation time and the accumulation reset time of the radiation imaging apparatus related to the first imaging. In this case, the imaging situations of the image obtained in the first imaging and the image obtained in the second imaging can be made more similar. Here, the first imaging can be either the imaging of a radiation image using radiation or the imaging of a dark image without using radiation. Also, the second imaging can be the other of the imaging of a radiation image and the imaging of a dark image. Note that the radiation image can be corrected using the dark image. With such a configuration, since the imaging situations of the radiation image and the dark image become more similar, the influence of the image due to the dark current can be more appropriately reduced.

[0087] In addition, the stop period can be determined based on at least one of the imaging technique, the size of the sensor unit 106, the clock signal of the drive circuit of the sensor unit 106, the conversion speed of the analog-to-digital conversion in the sensor unit 106, and the presence or absence of simultaneous selection of the imaging pixels of the sensor unit 106. Therefore, an appropriate stop period can be determined according to the imaging technique or the like, and the influence on the image quality of the sensor unit 106 due to noise from the non-contact power supply can be suppressed, or the power supply can be performed more efficiently.

[0088] In addition, the X-ray imaging apparatus 105 can transmit an irradiation permission signal after a predetermined time has elapsed since the transmission of the pause signal. Here, the predetermined time may be, for example, the delay time Td until non-contact power supply stops after receiving the pause signal. In this case, the X-ray imaging apparatus 105 transmits an irradiation permission signal for radiation in consideration of the period from when the pause signal is transmitted until non-contact power supply stops, and can more appropriately suppress the influence on the image quality of the sensor unit 106 due to noise from non-contact power supply. Note that the stop period can further include the delay time Td until non-contact power supply stops after the non-contact power supply device 120 receives the pause signal.

[0089] Furthermore, the radiation imaging system 100 further includes notification means. In the present embodiment, the X-ray imaging apparatus 105 includes a display unit 114, and the display unit 114 functions as an example of the notification means. The notification means can notify a warning when the stop period is longer than a predetermined time. Here, the predetermined time can be, for example, 12.6 seconds which is the maximum value of Re-Ping Delay. When the stop period is longer than the maximum value of Re-Ping Delay, the stop period cannot be set, and thus driving related to imaging cannot be performed. Therefore, by notifying the user of a warning, it is possible to prompt the user to review imaging conditions and the like.

[0090] In addition, the notification means can notify that the X-ray imaging apparatus 105 is under power supply. Thereby, the user can easily determine whether the X-ray imaging apparatus 105 is under power supply based on the notification.

[0091] Note that in the present embodiment, non-contact power supply is started at time t609 after the main reading ends at time t608, but time t608 and time t609 may be the same. Although Re-Ping Delay is defined so that it can be set in units of 200 ms, if the time from time t602 to time t608 is a multiple of 200 ms, time t608 and time t609 can be made the same, and power supply can be started simultaneously with the end of the main reading of the sensor unit 106. By doing so, the stop period can be shortened.

[0092] In the present embodiment, an example in which power supply from the contactless power supply device 120 is stopped at time t602 has been described, but the present invention is not limited to this. For example, in order to secure a longer power supply time, control may be performed so that the power supply is stopped at time t604. Specifically, the Re-Ping Delay can also be set to be equal to or longer than the time obtained by adding the time Tr (time t604 - time t605), the time Tm (time t605 - time t606), the time Ta (time t606 - time t607), and the time Tr (time t607 - time t608). Since the influence on the signal wirings Sig1 to Sig3 during the dummy read time and the accumulation time is smaller than the influence during the main read time, when giving priority to the power supply time over the image quality, control may be performed so that the power supply is stopped at time t604.

[0093] Also, according to a desired configuration, for example, control may be performed so that power supply is performed during the dummy read time and power supply is stopped during the accumulation time, for example, so that the power supply is stopped at time t603. Therefore, the stop period can include at least the read time of the image data, and can further include the accumulation time and the dummy read time (accumulation reset time) of the X-ray imaging apparatus 105, or the accumulation time of the X-ray imaging apparatus 105.

[0094] (Second Embodiment) Next, a second embodiment will be described. Regarding the second embodiment, descriptions of points overlapping with those of the first embodiment will be omitted. In the first embodiment, a case where contactless power supply is stopped through X-ray image imaging and dark image imaging has been described, but other methods are also conceivable. In the present embodiment, a method of making the power supply time of the contactless power supply longer will be described. This embodiment is different from the first embodiment in that contactless power supply is stopped only during the main read of X-ray image imaging and dark image imaging. Note that since the configuration of the radiation imaging system according to the present embodiment is the same as the configuration of the radiation imaging system 100 according to the first embodiment, description thereof will be omitted using the same reference numerals. Hereinafter, the radiation imaging system according to the present embodiment will be described centering on the differences from the radiation imaging system 100 according to the first embodiment.

[0095] FIGS. 7A and 7B are flowcharts showing an example of a series of shooting processes by the control unit 107 when non-contact power supply is performed to the X-ray imaging apparatus 105 according to the present embodiment. FIGS. 7A and 7B are different from FIG. 5 in that the flow from step S703 to step S709 is added. Also in the present embodiment, the non-contact power supply device 120 is connected to the non-contact power receiving unit 111 in a state where the contact power supply device 121 is not connected to the contact power receiving unit 112. As a result, the non-contact power receiving unit 111 and the non-contact power supply device 120 transition to the Power Transfer phase, and non-contact power supply is performed.

[0096] The operations shown in FIGS. 7A and 7B show an example of a method in which the control unit 107 issues a temporary stop instruction for power supply to the non-contact power supply device 120 based on a shooting instruction from the computer 103. In step S701, the control unit 107 checks, via the communication unit 104 and the communication unit 108, whether the procedure has been set by the computer 103 and a shooting preparation completion signal has been transmitted. If the shooting preparation completion signal has not been transmitted, the process returns to step S701. On the other hand, if the shooting preparation completion signal has been transmitted, the control unit 107 starts the dummy drive of the sensor unit 106, and the process proceeds to step S702.

[0097] In step S702, the control unit 107 checks the procedure set when the shooting preparation completion signal is transmitted from the computer 103. The control unit 107 reads, from the memory unit 115, the stop period of power supply to the non-contact power supply device 120 according to the confirmed procedure, and the process proceeds to step S703.

[0098] In step S703, the control unit 107 checks the remaining amount of the battery 109 and determines whether it is equal to or greater than a predetermined remaining amount (predetermined threshold value). In the present embodiment, the control unit 107 checks whether the remaining amount of the battery 109 is equal to or greater than the remaining amount for one shot. If the remaining amount of the battery 109 is less than the remaining amount for one shot, it is determined that the battery remaining amount is low, and the process proceeds to step S704. On the other hand, if the remaining amount of the battery 109 is equal to or greater than the remaining amount for one shot, the process proceeds to step S710. The operations from step S710 to step S717 at this time are the same as the operations from step S503 to step S510 in FIG. 5, and the operation in step S713 is also the operation shown in FIG. 6.

[0099] In step S704, the control unit 107 gives priority to power supply from the non-contact power supply device 120 during shooting. Specifically, the control unit 107 sets the non-contact power supply setting to prioritize power supply so that power supply is stopped only during the main reading drive of the sensor unit 106. By stopping power supply only during the main reading drive, the power supply time can be extended, and the battery 109 can be fully charged in a shorter time.

[0100] In step S705, the control unit 107 compares the integration time Ta and the delay time Td. If the delay time Td is greater than the integration time Ta, the process proceeds to step S707.

[0101] In step S707, the control unit 107 further compares the sum of the integration time Ta and the blank reading time Tm with the delay time Td. If the delay time Td is less than or equal to the sum of the integration time Ta and the blank reading time Tm, the process proceeds to step S709. On the other hand, if the delay time Td is greater than the sum of the integration time Ta and the blank reading time Tm, the process proceeds to step S708.

[0102] In step S708, the control unit 107 re - sets the blanking time Tm. The control unit 107 sets the blanking time Tm such that it becomes the delay time Td - accumulation time Ta. In this embodiment, the control unit 107 sets the blanking time Tm such that it becomes the delay time Td - accumulation time Ta, but the blanking time Tm may be set so that the delay time Td is less than or equal to the sum of the accumulation time Ta and the blanking time Tm. Then, the process proceeds to step S709.

[0103] In step S709, the control unit 107 sets the operation to the post - power - supply - stop shooting start setting, such that when shooting, after the control unit 107 transmits the EPT signal of the reason code Re - Ping to the non - contact power supply device 120, it gives a shooting instruction to the sensor unit 106. In the post - power - supply - stop shooting start setting, it is sufficient that a shooting instruction is given to the sensor unit 106 after the EPT signal (temporary stop signal) of the reason code Re - Ping is transmitted to the non - contact power supply device 120. Therefore, when shooting starts, it is not necessary that the power supply is actually stopped. Then, the process proceeds to step S710.

[0104] Also, when the accumulation time Ta is greater than or equal to the delay time Td in step S705, the process proceeds to step S706. In step S706, the control unit 107 sets the operation to the post - shooting - start power - supply - stop setting, such that when shooting, after the control unit 107 gives a shooting instruction to the sensor unit 106, it transmits the EPT signal of the reason code Re - Ping to the non - contact power supply device 120. Then, the process proceeds to step S710. Steps S703 to S709 above are regarded as step S750.

[0105] In step S710, the control unit 107 checks whether the stop period is greater than 12.6 seconds in the same way as in step S503. If the stop period is greater than 12.6 seconds, the process proceeds to step S717. In step S717, in the same way as in step S510, the control unit 107 causes the display unit 114 to display an error message indicating that the main drive is not possible. Then, the control unit 107 ends the blanking drive and ends the series of operations.

[0106] If the stop period is 12.6 seconds or less, the process proceeds to step S711. In step S711, the control unit 107 sets the stop period for the non-contact power supply device 120. Specifically, the control unit 107 causes the non-contact power supply device 120 to transition to the Renegotiation phase and sets the Re-Ping Delay. The value set here is based on the main reading time Tr. For example, when the main reading time Tr = 300 ms, since the Re-Ping Delay is defined to be set in units of 200 ms, the control unit 107 sets 400 ms as the Re-Ping Delay. Note that the difference between the main reading time Tr and the Re-Ping Delay is added as an additional idle reading time Tm' after the main reading time. In the above example, since the Re-Ping Delay is 400 ms and the main reading time Tr is 300 ms, the additional idle reading time Tm' is 100 ms. If the Re-Ping Delay and the main reading time Tr are the same, the additional idle reading time Tm' is 0 ms.

[0107] To transmit the EPT signal of the reason code Re-Ping from the non-contact power receiving unit 111 to the non-contact power supply device 120, power supply from the non-contact power supply device 120 must have started. In contrast, by adding the additional idle reading time Tm', it is possible to resume power supply at the timing when the EPT signal of the reason code Re-Ping should be transmitted again to the non-contact power supply device 120. Therefore, by adding the additional idle reading time Tm', the non-contact power receiving unit 111 can transmit the EPT signal of the reason code Re-Ping to the non-contact power supply device 120 again. After the Re-Ping Delay is set, the process proceeds to step S712.

[0108] In step S712, the control unit 107 checks whether a shooting permission signal has been transmitted from the computer 103. If the shooting permission signal has not been transmitted, the process proceeds to step S716. On the other hand, if the shooting permission signal has been transmitted, the process proceeds to step S713.

[0109] In step S713, the control unit 107 performs imaging. At this time, in step S713, the driving differs depending on whether the setting in step S706 was performed, whether the setting in step S709 was performed, or whether neither setting was performed. Specific driving will be described later.

[0110] In step S714, the control unit 107 sends the captured image to the image processing unit 116, and the image processing unit 116 performs arbitrary image processing such as correction using a dark image on the captured image. Also, the control unit 107 sends the image on which the image processing has been performed to the control unit 107.

[0111] In step S715, the control unit 107 transfers the image to the computer 103 and checks whether the transfer of the image has been completed. If the transfer of the image has not been completed, the process proceeds to step S715 again. If the transfer of the image has been completed, the process proceeds to step S712.

[0112] In step S716, the control unit 107 checks whether an imaging end signal has been transmitted from the computer 103. If the imaging end signal has not been transmitted, the process proceeds to step S712. On the other hand, if the imaging end signal has been transmitted, the control unit 107 terminates the idle drive and terminates the series of operations.

[0113] FIG. 8 is a timing chart showing an example of the operations of the sensor unit 106, the X-ray generator 101, and the non-contact power supply device 120 under the control of the control unit 107 when the setting in step S709 was performed in step S713 according to the present embodiment.

[0114] Time t801 is the timing of the power supply stop instruction to the non-contact power supply device 120 by the control unit 107 in step S713. Specifically, the control unit 107 transmits an EPT signal with the reason code Re-Ping to the non-contact power supply device 120. After receiving the EPT signal with the reason code Re-Ping, the non-contact power supply device 120 stops non-contact power supply after the elapse of the delay time Td. The delay time Td is stored in advance in the memory unit 115, and the control unit 107 can read the delay time Td from the memory unit 115.

[0115] Time t802 is the timing when the control unit 107 issues a shooting instruction to the X-ray control device 102 in step S710. Time t802 is the time when a time of delay time Td - accumulation time Ta has elapsed from time t801. Thereby, power supply is stopped at time t803 simultaneously with the end of the accumulation time of the sensor unit 106. The sensor unit 106 performs accumulation driving for the accumulation time Ta from time t802 to a predetermined time t803. At the same time, X-rays are irradiated from the X-ray generating device 101. Thereafter, the sensor unit 106 performs main reading driving for the main reading time Tr from time t803 to time t804. Through the operations from time t802 to time t804, the sensor unit 106 acquires an X-ray image.

[0116] Subsequently, with an additional blank reading time Tm' from time t804 to time t805 and a blank reading time Tm from time t805 to time t807 (total blank reading time Tm'+Tm), the control unit 107 performs blank reading drive again. If the Re-Ping Delay and the main reading time Tr are the same, time t804 and time t805 are the same time. From time t805, the non-contact power supply device 120 resumes power supply. Next, at time t806, the control unit 107 issues another power supply stop instruction to the non-contact power supply device 120, and at time t807, the control unit 107 issues a shooting instruction to the sensor unit 106. Similar to time t802 which is the time when the delay time Td - accumulation time Ta has elapsed from time t801, time t807 is the time when the delay time Td - accumulation time Ta has elapsed from time t806. Thereby, power supply is stopped at time t808 simultaneously with the end of the accumulation time of the sensor unit 106. Thereafter, the sensor unit 106 performs main reading drive with the main reading time Tr from time t808 to time t809. Through the operations from time t807 to time t809, the sensor unit 106 acquires a dark image.

[0117] From time t810, the non-contact power supply device 120 resumes power supply. If the Re-Ping Delay and the main reading time Tr are the same, time t809 and time t810 are the same time.

[0118] FIG. 9 is a timing chart showing an example of the operations of the sensor unit 106, the X-ray generator 101, and the non-contact power supply device 120 under the control of the control unit 107 when the setting in step S706 is made in step S713 according to the present embodiment.

[0119] Time t901 is the timing when the control unit 107 in step S713 issues a shooting instruction to the X-ray control device 102. The sensor unit 106 performs accumulation drive with an accumulation time Ta from time t901 to a predetermined time t903. At the same time, X-rays are irradiated from the X-ray generator 101.

[0120] The time t902 is the timing of the power supply stop instruction to the non-contact power supply device 120 by the control unit 107 in step S713. Specifically, the control unit 107 transmits an EPT signal with the reason code Re-Ping to the non-contact power supply device 120. After receiving the EPT signal with the reason code Re-Ping, the non-contact power supply device 120 stops non-contact power supply after the elapse of the delay time Td. The delay time Td is stored in advance in the memory unit 115, and the control unit 107 can read the delay time Td from the memory unit 115. The time t902 is the time when the accumulated time Ta - the delay time Td has elapsed from the time t901. Thereby, power supply is stopped at the time t903 simultaneously with the end of the accumulation time of the sensor unit 106. Thereafter, the sensor unit 106 performs main reading drive for the main reading time Tr from the time t903 to the time t904. In the operation from the time t902 to the time t904, the sensor unit 106 acquires an X-ray image.

[0121] Subsequently, for the blank reading time Tm'+Tm from the time t904 to the time t906, the control unit 107 performs blank reading drive again. The time from the time t904 to the time t905 is the additional blank reading time Tm'. If the Re-Ping Delay and the main reading time Tr are the same, the time t904 and the time t905 are the same time. From the time t905, the non-contact power supply device 120 resumes power supply.

[0122] Next, at the time t906, the control unit 107 issues a shooting instruction to the sensor unit 106 again, and at the time t907, the control unit 107 issues a power supply stop instruction to the non-contact power supply device 120. Similar to the time t902 when the accumulated time Ta - the delay time Td has elapsed from the time t901, the time t907 is the time when the accumulated time Ta - the delay time Td has elapsed from the time t906. Thereby, power supply is stopped at the time t908 simultaneously with the end of the accumulation time of the sensor unit 106. Thereafter, the sensor unit 106 performs main reading drive for the main reading time Tr from the time t908 to the time t909. In the operation from the time t906 to the time t909, the sensor unit 106 acquires a dark image. From the time t910, the non-contact power supply device 120 resumes power supply. If the Re-Ping Delay and the main reading time Tr are the same, the time t909 and the time t910 are the same time.

[0123] As described above, the stop period according to the present embodiment can include the readout time of the X-ray imaging apparatus 105 that functions as an example of a radiation imaging apparatus. In such a configuration, only during the main reading operation of the sensor unit 106, by temporarily stopping the power supply from the non-contact power supply device 120, it is possible to suppress the influence on the image quality of the sensor unit 106 due to noise from the non-contact power supply, and it is possible to ensure a long power supply time. Further, by transmitting a pause signal including the stop period of the power supply in the non-contact power supply communication from the non-contact power receiving unit 111 to the non-contact power supply device 120, the non-contact power supply device 120 can be made to stop and restart the power supply. Therefore, it is possible to restart the power supply from the non-contact power supply device 120 without performing communication other than non-contact power supply.

[0124] Further, the X-ray imaging apparatus 105 can further include a battery 109. Furthermore, when the remaining amount of the battery 109 is equal to or less than the threshold value, the stop period can exclude the accumulation time and the accumulation reset time of the X-ray imaging apparatus 105, or the accumulation time of the X-ray imaging apparatus 105. In such a case, when the remaining battery amount is small, power supply priority setting can be implemented. Therefore, more appropriate power supply control according to the remaining battery amount can be performed.

[0125] Furthermore, when the delay time Td from when the pause signal is transmitted until the non-contact power supply device 120 stops the power supply is longer than the accumulation time Ta of the X-ray imaging apparatus 105, after the non-contact power receiving unit 111 transmits the pause signal, the X-ray imaging apparatus 105 can transmit an irradiation permission signal. On the other hand, when the delay time is less than or equal to the accumulation time, after the X-ray imaging apparatus 105 transmits the irradiation permission signal, the non-contact power receiving unit 111 can transmit the pause signal. In such a configuration, since power supply can also be performed during the accumulation time of the radiation imaging apparatus, the stop period of the power supply can be shortened, and image acquisition with low noise image quality influence can be performed.

[0126] Also, when the delay time Td from when the pause signal is transmitted until the non-contact power supply device 120 stops power supply is greater than the combined time of the accumulation time Ta and the accumulation reset time (blanking time Tm) of the X-ray imaging device 105, the X-ray imaging device 105 can reset the accumulation reset time so that the delay time Td is equal to or less than the combined time of the accumulation time Ta and the accumulation reset time. In this case, it is possible to prevent the power supply from stopping after the accumulation time and the accumulation reset time of the X-ray imaging device 105 have elapsed, and suppress the influence on the image quality of the sensor unit 106 due to noise from the non-contact power supply.

[0127] Also, in this case, the X-ray imaging device 105 can transmit an irradiation permission signal after a predetermined time has elapsed since the pause signal was transmitted. Here, the predetermined time may be, for example, the remaining time obtained by subtracting the accumulation time Ta of the X-ray imaging device 105 from the delay time Td until non-contact power supply stops after receiving the pause signal. In this case, the X-ray imaging device 105 transmits an irradiation permission signal for radiation in consideration of the period from when the pause signal is transmitted until non-contact power supply stops, and can stop non-contact power supply in accordance with the readout time of the image data by the X-ray imaging device 105. For this reason, it is possible to shorten the power supply stop period due to noise from non-contact power supply and acquire an image with a low influence of noise on the image quality.

[0128] Note that in this embodiment, it is determined whether to perform power supply priority setting according to the remaining battery level in step S703, but it is not limited thereto. For example, it may be determined whether to perform power supply priority setting according to the length of the accumulation time. In driving with a long accumulation time, since the influence of the noise component becomes relatively low, it may be possible to perform power supply for the blanking time and the accumulation time with a slight influence on the image quality of non-contact power supply.

[0129] Specifically, when the accumulation time is longer than the threshold value in step S703, the process may transition to step S704, and when the accumulation time is equal to or less than the threshold value, the process may transition to step S710. Therefore, when the accumulation time of the X-ray imaging apparatus 105 is longer than the threshold value, the stop period may not include the accumulation time and the accumulation reset time (blanking time) of the X-ray imaging apparatus 105, or may not include the accumulation time of the X-ray imaging apparatus 105. With such a configuration, the stop period of power supply can be shortened, and an image can be acquired with less influence of noise on the image quality.

[0130] (Third Embodiment) Next, the third embodiment will be described. Regarding the third embodiment, descriptions of points overlapping with those of the first and second embodiments will be omitted. In the first and second embodiments, the case where non-contact power supply is stopped through X-ray imaging and dark image imaging has been described, but other methods are also conceivable. In this embodiment, a method of stopping the non-contact power supply by another method will be described. This embodiment is different from the first and second embodiments in that the detection of X-ray irradiation is performed not based on a synchronization signal but by the X-ray imaging apparatus 105 itself. Here, the synchronization signal includes, for example, an irradiation permission signal and a imaging permission signal. Regarding the configuration of the radiation imaging system according to this embodiment that is the same as the configuration of the radiation imaging system 100 according to the first embodiment, the same reference numerals will be used and the description will be omitted. Hereinafter, the radiation imaging system according to this embodiment will be described centering on the differences from the radiation imaging system 100 according to the first embodiment.

[0131] FIG. 10 is a block diagram showing a configuration example of a radiation imaging system 1000 according to this embodiment. The radiation imaging system 1000 according to this embodiment is different from the radiation imaging system 100 shown in FIG. 1 in that an irradiation detection unit 130 is provided. The irradiation detection unit 130 has a function for detecting the presence or absence of X-ray irradiation.

[0132] Regarding the method for realizing the irradiation detection unit 130, in this embodiment, a method of detection using a scintillator and an optical sensor is adopted in the same manner as the sensor unit 106. However, it is not limited thereto, and the irradiation detection unit 130 may be realized by a method of detecting the flow of current generated in the sensor unit 106 by X-ray irradiation, a method of detection using a direct conversion type optical sensor, or the like. In FIG. 10, the irradiation detection unit 130 is described as a single functional unit, but the irradiation detection unit 130 may be integrated with the sensor unit 106 or the like.

[0133] When the irradiation detection unit 130 detects that X-rays have been irradiated, it notifies the control unit 107 to that effect. Upon receiving this, the control unit 107 accumulates charges due to X-rays in the sensor unit 106, and controls the sensor unit 106 to read out the charges and generate an image.

[0134] FIGS. 11A and 11B are flowcharts showing an example of a series of shooting processes by the control unit 107 when non-contact power supply is performed to the X-ray imaging apparatus 105 according to the third embodiment. The flowcharts shown in FIGS. 11A and 11B are different from the flowcharts shown in FIGS. 7A and 7B in that the flow from step S1103 to step S1106 is added. Also in this embodiment, in a state where the contact power supply device 121 is not connected to the contact power receiving unit 112, the non-contact power supply device 120 is connected to the non-contact power receiving unit 111. As a result, the non-contact power receiving unit 111 and the non-contact power supply device 120 transition to the Power Transfer phase, and non-contact power supply is performed.

[0135] In step S1101, the control unit 107 checks, via the communication unit 104 and the communication unit 108, whether settings for procedures and shooting using the irradiation detection unit 130 have been made by the computer 103 and whether a shooting preparation completion signal has been transmitted. If the shooting preparation completion signal has not been transmitted, the process returns to step S1101. On the other hand, if the shooting preparation completion signal has been transmitted, the control unit 107 starts a dummy read drive for the sensor unit 106, and the process proceeds to step S1102.

[0136] In step S1102, the control unit 107 checks the procedure set when the shooting preparation completion signal is sent from the computer 103. According to the confirmed procedure, the control unit 107 reads from the memory unit 115 the power supply stop period to the non-contact power supply device 120, and the process proceeds to step S1103.

[0137] In step S1103, the control unit 107 checks whether the operation set in step S1101 uses the irradiation detection unit 130, in other words, whether the X-ray imaging device 105 is in the irradiation detection mode. If the operation set in step S1101 does not use the irradiation detection unit 130 (not in the irradiation detection mode), the process proceeds to step S1104.

[0138] In step S1104, the control unit 107 sets to wait for the permission signal for setting the start of shooting. When the setting to wait for the permission signal is made, the process proceeds to step S750, where it is set whether to stop the power supply after the start of shooting or start shooting after the power supply is stopped, and then the process proceeds to step S1107. Note that the process in step S750 may be the same as the process described for step S750 in the second embodiment.

[0139] On the other hand, in step S1103, if the operation set in step S1101 uses the irradiation detection unit 130 (in the irradiation detection mode), the process proceeds to step S1105. In step S1105, the accumulation time Ta and the delay time Td are compared.

[0140] In step S1105, if the accumulation time Ta is greater than or equal to the delay time Td, the process proceeds to step S1106. In step S1106, the control unit 107 sets to wait for irradiation detection for setting the start of shooting. Then the process proceeds to step S1107.

[0141] On the other hand, in step S1105, if the delay time Td is greater than the accumulation time Ta, the process proceeds to step S1113. In step S1113, the control unit 107 causes the display unit 114 to display an error message. If the delay time Td is longer than the accumulation time Ta, the power supply will stop within the main reading time, and the image will be affected by noise from the power supply. Therefore, the control unit 107 uses the error display to notify the user of this. After that, the control unit 107 ends the dummy drive and terminates the series of operations.

[0142] In step S1107, the control unit 107 checks whether the stop period (the time of Re-Ping Delay) is greater than 12.6 seconds, similar to step S503. If the time of Re-Ping Delay is greater than 12.6 seconds, the process proceeds to step S1113.

[0143] In step S1113, similar to step S510, the control unit 107 causes the display unit 114 to display an error message indicating that the main drive cannot be performed. After that, the control unit 107 ends the dummy drive and terminates the series of processes. Steps S1103 to S1113 above are referred to as step S1150.

[0144] On the other hand, in step S1107, if the time of Re-Ping Delay is 12.6 seconds or less, the process proceeds to step S1108. In step S1108, the control unit 107 sets the stop period for the non-contact power supply device 120. Specifically, the control unit 107 causes the non-contact power supply device 120 to transition to the Renegotiation phase and sets the Re-Ping Delay. After setting the Re-Ping Delay, the control unit 107 causes the non-contact power supply device 120 to transition to the Power Transfer phase, and the process proceeds to step S1109.

[0145] In step S1109, the control unit 107 checks whether the operation to start shooting has been performed. If the operation to start shooting has not been performed, the process proceeds to step S1114. On the other hand, if the operation to start shooting has been performed, the process proceeds to step S1110.

[0146] Here, if the permission signal waiting setting has been made in step S1104, the control unit 107 performs the operations described in the first embodiment. That is, the control unit 107 performs driving according to the timing chart of FIG. 6 in step S1110.

[0147] On the other hand, if the irradiation detection waiting setting has been made in step S1106, the control unit 107 waits for the irradiation of X-rays to the irradiation detection unit 130. In this case, in step S1110, the control unit 107 performs shooting by driving according to the timing chart of FIG. 12 described later.

[0148] In step S1111, the control unit 107 sends the captured image to the image processing unit 116, and the image processing unit 116 performs arbitrary image processing such as correction using a dark image on the captured image. Further, the image processing unit 116 sends the image subjected to the image processing to the control unit 107.

[0149] In step S1112, the control unit 107 transfers the image to the computer 103 and checks whether the transfer of the image has been completed. If the transfer of the image has not been completed, the process returns to step S1112. On the other hand, if the transfer of the image has been completed, the process proceeds to step S1109.

[0150] In step S1114, the control unit 107 checks whether a shooting end signal has been transmitted from the computer 103. If the shooting end signal has not been transmitted, the process proceeds to step S1109. On the other hand, if the shooting end signal has been transmitted, the control unit 107 terminates the dummy drive and terminates the series of operations.

[0151] FIG. 12 is a timing chart showing an example of the operations of the sensor unit 106, the X-ray generator 101, and the non-contact power supply device 120 under the control of the control unit 107 when the irradiation detection wait setting is made in step S1107 in step S1110 according to the present embodiment.

[0152] Time t1201 is the timing at which the irradiation detection unit 130 detects that X-rays have been irradiated in step S1110 and notifies the control unit 107 to that effect, and the control unit 107 issues a power supply stop instruction to the non-contact power supply device 120. Also, time t1201 is the timing at which the sensor unit 106 performs accumulation driving for an accumulation time Ta from time t1201 to a predetermined time t1203 in accordance with a shooting instruction from the control unit 107.

[0153] Specifically, the control unit 107 transmits an EPT signal with a reason code Re-Ping to the non-contact power supply device 120. At this time, Re-Ping Delay is set to be equal to or greater than the time obtained by adding the time Tr (time t1203 - time t1204), the time Tm (time t1204 - time t1205), the time Ta (time t1205 - time t1206), and the time Tr (time t1206 - time t1207). Note that Re-Ping Delay may be determined by further adding the time Td from time t1202 to time t1208. After receiving the EPT signal with the reason code Re-Ping, the non-contact power supply device 120 stops non-contact power supply after the elapse of the delay time Td. The delay time Td is stored in advance in the memory unit 115, and the control unit 107 can read the delay time Td from the memory unit 115.

[0154] Time t1202 is the timing after the elapse of the delay time Td from time t1201, and is the timing at which the power supply of the non-contact power supply device 120 stops. Since the power supply from the non-contact power supply device 120 stops, the control unit 107 sets the charge control unit 402 to perform power supply from the battery 109. Thereafter, the sensor unit 106 performs main reading driving for the main reading time Tr from time t1203 to time t1204. In the operation from time t1201 to time t1204, the sensor unit 106 acquires an X-ray image.

[0155] Subsequently, the sensor unit 106 performs a dummy read drive for a dummy read time Tm from time t1204 to time t1205. Next, the sensor unit 106 performs an accumulation drive again for an accumulation time Ta from time t1205 to time t1206, and the sensor unit 106 performs a main read drive for a main read time Tr from time t1206 to time t1207. In the operation from time t1205 to time t1207, the sensor unit 106 acquires a dark image. From time t1208, the non-contact power supply device 120 resumes power supply.

[0156] As described above, the X-ray imaging apparatus 105 that functions as an example of the radiation imaging apparatus according to the present embodiment can further include an irradiation detection unit 130 that detects radiation from the X-ray generator 101 that functions as an example of the radiation irradiation device. Further, the non-contact power reception unit 111 can transmit a pause signal in response to the irradiation detection unit 130 detecting radiation.

[0157] According to such a configuration, even in a configuration in which the radiation imaging apparatus itself detects radiation irradiation, it is possible to suppress the influence on the image quality of the sensor unit 106 due to noise from non-contact power supply. Further, by transmitting a pause signal including a power supply stop period in non-contact power supply communication from the non-contact power reception unit 111 to the non-contact power supply device 120, the non-contact power supply device 120 can be made to stop and resume power supply. Therefore, it is possible to resume power supply from the non-contact power supply device 120 without performing communication other than non-contact power supply.

[0158] In this embodiment, the non-contact power receiving unit 111 transmits a pause signal in response to the irradiation detection unit 130 detecting radiation. On the other hand, the non-contact power receiving unit 111 can also transmit a pause signal in response to the X-ray imaging apparatus 105 transmitting an irradiation permission signal. More specifically, the X-ray imaging apparatus 105 can transmit an irradiation permission signal to the X-ray generator 101, which functions as an example of a radiation irradiation device, via the computer 103 and the X-ray control device 102. Also in this case, similar to the case of transmitting a pause signal in response to detecting radiation irradiation, it is possible to suppress the influence on the image quality of the sensor unit 106 due to noise from non-contact power supply.

[0159] (Fourth Embodiment) Next, the fourth embodiment will be described. Regarding the fourth embodiment, descriptions of points overlapping with those of the first to third embodiments will be omitted. In the first to third embodiments, an example in which the X-ray imaging apparatus mainly captures still images has been described, but other methods are also conceivable. This embodiment is different from the first to third embodiments in that the X-ray imaging apparatus can capture moving images. Since the configuration of the radiation imaging system according to this embodiment is the same as the configuration of the radiation imaging system 100 according to the first embodiment, the description will be omitted using the same reference numerals. Hereinafter, the radiation imaging system according to this embodiment will be described centering on the differences from the radiation imaging system 100 according to the first embodiment.

[0160] FIGS. 13A and 13B are flowcharts showing an example of a series of imaging processes by the control unit 107 when non-contact power supply is being performed to the X-ray imaging apparatus 105 according to the fourth embodiment. Also in this embodiment, the non-contact power supply device 120 is connected to the non-contact power receiving unit 111 in a state where the contact power supply device 121 is not connected to the contact power receiving unit 112. As a result, the non-contact power receiving unit 111 and the non-contact power supply device 120 transition to the Power Transfer phase, and non-contact power supply is performed.

[0161] In step S1301, the control unit 107 checks, via the communication unit 104 and the communication unit 108, whether the computer 103 has set a procedure or set to perform shooting using the irradiation detection unit 130, and whether a shooting preparation completion signal has been transmitted. If the shooting preparation completion signal has not been transmitted, the process returns to step S1301. On the other hand, if the shooting preparation completion signal has been transmitted, the process proceeds to step S1302.

[0162] In step S1302, the control unit 107 checks the procedure set when the shooting preparation completion signal is transmitted from the computer 103. The control unit 107 reads, from the memory unit 115, the power supply stop period for the non-contact power supply device 120 according to the confirmed procedure, and the process proceeds to step S1303.

[0163] In step S1303, the control unit 107 determines whether the procedure set in step S1302 is for moving image shooting or still image shooting. If the set procedure is for still image shooting, the control unit 107 starts the dummy drive for the sensor unit 106, and the process proceeds to step S1150. The process in step S1150 may be the same as the process described for step S1150 in the third embodiment.

[0164] On the other hand, if the set procedure is for moving image shooting, the control unit 107 starts the drive for repeatedly performing the accumulation drive and the real reading drive on the sensor unit 106, and the process proceeds to step S1304. The drive of the sensor unit 106 will be described later. In step S1304, the control unit 107 checks whether the frame rate of the procedure set in step S1302 is 1 / (Td + 200 ms) or more. For example, when the delay time Td is 50 ms, the control unit 107 checks whether the frame rate is 4 fps or more. If the frame rate is 1 / (Td + 200 ms) or more, the process proceeds to step S1311. In step S1311, the control unit 107 causes the display unit 114 to display an error message (warning).

[0165] 200 ms is the shortest period of Re-Ping Delay and the shortest power supply stop period. If the time obtained by adding the delay time Td to this period exceeds the time per frame, power supply from the contactless power supply device 120 cannot be started until the timing at which power supply should stop in the next frame after power supply stop. Therefore, the contactless power receiving unit 111 cannot transmit the EPT signal of the reason code Re-Ping to the contactless power supply device 120. In such a case, the timing of this read drive and the stop period does not match, and noise and artifacts due to contactless power supply occur in the image acquired from the sensor unit 106. Therefore, in step S1311, the control unit 107 notifies the user of this fact by error display. After that, the control unit 107 ends the dummy read drive and ends the series of operations.

[0166] On the other hand, in step S1304, if the frame rate is less than 1 / (Td + 200 ms), the process proceeds to step S1305. In step S1305, the control unit 107 sets the stop period for the contactless power supply device 120. Specifically, the control unit 107 causes the contactless power supply device 120 to transition to the Renegotiation phase and sets the Re-Ping Delay. Here, the value to be set is a value based on the main read time Tr. For example, when the main read time Tr = 300 ms, since the Re-Ping Delay is defined to be set in units of 200 ms, the control unit 107 sets 400 ms as the Re-Ping Delay. After setting the Re-Ping Delay, the control unit 107 causes the contactless power supply device 120 to transition to the Power Transfer phase, and the process proceeds to step S1306.

[0167] In step S1306, the control unit 107 acquires a dark image using the sensor unit 106. FIG. 14 is a timing chart showing an example of the operations of the sensor unit 106 and the non-contact power supply device 120 according to the control of the control unit 107 in step S1306 of FIG. 13B according to the present embodiment. Note that the sensor unit 106 performs driving in which accumulation driving and main reading driving are repeated under the control from the control unit 107 in step S1303. However, in the present embodiment, the reading of an image not used as a dark image is described as dummy reading driving for clarification.

[0168] In FIG. 14, dark images for three frames are captured, and the control unit 107 averages the acquired images for three frames in the image processing unit 116 to obtain one dark image, which is stored in the memory unit 115. Note that, in the present embodiment, dark images for three frames are acquired, but the number of frames is not limited to this. The number of frames of the acquired dark image may be, for example, one, or as many frames as possible within the allowable time to reduce the random noise component of each pixel.

[0169] Time t1401 is the timing at which the control unit 107 starts capturing a dark image and accumulation driving is started. The control unit 107 transmits to the image processing unit 116 dark images for a predetermined number of frames that are main-read after time t1401 and used as dark images. Also, since power supply is stopped only during the main reading driving at this time, power supply is maintained during the dummy reading driving from time t1400 to time t1401 that is not used for the dark image.

[0170] The sensor unit 106 performs accumulation driving for an accumulation time Ta from time t1401 to a predetermined time t1403. Time t1402 is the time when the non-contact power reception unit 111 transmits an EPT signal with reason code Re-Ping to the non-contact power supply device 120, and is the time when a time of Ta - delay time Td has elapsed from time t1401. At this time, Re-Ping Delay is set to time Tr (time t1403 - time t1404). Note that Re-Ping Delay may be determined by adding further time Td from time t1403 to time t1404. Thereby, power supply is stopped at time t1403 simultaneously with the end of the accumulation time of the sensor unit 106. Thereafter, the sensor unit 106 performs main reading driving for a main reading time Tr from time t1403 to time t1404. In the operation from time t1401 to time t1404, the sensor unit 106 acquires a dark image for one frame.

[0171] By repeating the operation from time t1404 to time t1408 and from time t1408 to time t1412 twice, dark images for three frames are acquired. At time t1404, accumulation driving for acquiring the second-frame dark image is started. Time t1405 is the time when a time of Re-Ping Delay has elapsed from time t1403. When the main reading time Tr and the Re-Ping Delay time are the same, times t1404 and t1405 are at the same timing. Thereafter, the same operation as that for the first frame is performed, acquisition of the dark image ends at time t1412, and the control unit 107 causes the sensor unit 106 to perform blank reading driving.

[0172] The control unit 107 sends the acquired dark image to the image processing unit 116, the image processing unit 116 performs averaging processing on the acquired dark image, and the averaged dark image is stored in the memory unit 115. Thereafter, the process proceeds to step S1307.

[0173] In step S1307, the control unit 107 checks whether a shooting permission signal has been sent from the computer 103. If the shooting permission signal has not been sent, the process proceeds to step S1312. On the other hand, if the shooting permission signal has been sent, the process proceeds to step S1308. Note that the shooting permission signal can be sent from the computer 103 to the control unit 107, for example, while an engineer presses an irradiation switch or the like.

[0174] In step S1308, the control unit 107 performs shooting for one frame. The driving in step S1308 will be described later.

[0175] In step S1309, the control unit 107 sends the captured image to the image processing unit 116, and the image processing unit 116 performs arbitrary image processing such as correction using a dark image on the captured image. Also, in step S1309, the image processing unit 116 sends the image on which the image processing has been performed to the control unit 107.

[0176] In step S1310, the control unit 107 checks whether a shooting permission signal has been sent from the computer 103. If the shooting permission signal has not been sent, that is, if shooting has stopped, the process proceeds to step S1307. On the other hand, if the shooting permission signal has been sent, the process proceeds to step S1308, and the control unit 107 performs shooting for one frame again. Note that in steps S1308 to S1310, while the shooting permission signal is being sent, the control unit 107 repeatedly captures images and transfers the images on which the image processing has been performed to the computer 103.

[0177] In step S1312, the control unit 107 checks whether a shooting end signal has been sent from the computer 103. If the shooting end signal has not been sent, the process proceeds to step S1307. On the other hand, if the shooting end signal has been sent, the control unit 107 ends the repeated driving of the blank reading drive and the accumulation drive, and ends the series of operations.

[0178] FIG. 15 is a timing chart showing an example of the operations of the sensor unit 106 and the non-contact power supply device 120 under the control of the control unit 107 from step S1307 to step S1310 according to the present embodiment. FIG. 15 is different from FIG. 14 in that the X-ray generator 101 is irradiating X-rays. For FIG. 15, descriptions of the same points as in FIG. 14 are omitted.

[0179] Time t1501 is the timing at which the control unit 107 starts X-ray imaging and the accumulation drive is started. When the control unit 107 confirms the reception of the imaging permission signal from the computer 103, it transmits an irradiation permission signal to the computer 103. When the computer 103 transmits the irradiation permission signal to the X-ray control device 102, the X-ray generator 101 irradiates X-rays.

[0180] At time t1502, the control unit 107 transmits an EPT signal of reason code Re-Ping to the non-contact power supply device 120 in accordance with the reception of the imaging permission signal. From time t1501 to time t1504, the sensor unit 106 acquires an X-ray image for one frame by the same operation as the operation from time t1401 to time t1404 in FIG. 14. Also, the control unit 107 repeats the same operation as that from time t1501 to time t1504 between time t1504 and time t1508, and between time t1508 and time t1512. In the present embodiment, X-ray images for three frames are acquired by the operations from time t1501 to time t1512. At time t1512, since the imaging permission signal from the computer 103 is not received, the acquisition of the X-ray image ends.

[0181] Note that the control unit 107 sequentially sends the X-ray images obtained in the above drive to the image processing unit 116. The image processing unit 116 sequentially corrects the X-ray images using the dark images stored in the memory unit 115 and sends them to the control unit 107. The control unit 107 sequentially sends the corrected X-ray images to the computer 103.

[0182] As described above, the contactless power receiving unit 111 that functions as an example of the power receiving unit according to the present embodiment can transmit a pause signal to the contactless power supply device 120 that functions as an example of the power supply device every time an image of a frame is captured when a radiation image of a moving image is captured. According to such a configuration, in the main reading operation of the sensor unit 106, by temporarily stopping the power supply from the contactless power supply device 120, it is possible to capture a moving image while suppressing the influence on the image quality of the sensor unit 106 due to noise from the contactless power supply. Further, by transmitting a pause signal including a power supply stop period in the communication of the contactless power supply from the contactless power receiving unit 111 to the contactless power supply device 120, the contactless power supply device 120 can be made to stop and resume power supply. Therefore, the power supply from the contactless power supply device 120 can be resumed without performing communication other than the contactless power supply.

[0183] In the present embodiment, an example in which power supply is performed during the dummy read time from time t1400 to time t1401 and from time t1500 to time t1501 has been shown, but the present invention is not limited to this. In order to avoid the influence on the signal wirings Sig1 to Sig3 during the dummy read time, it may be driven to stop power supply during at least one dummy read time before frame acquisition.

[0184] FIG. 16 is a timing chart showing an example of the operations of the sensor unit 106 and the contactless power supply device 120 according to the control of the control unit 107 when power supply is not performed during the dummy read time for two times before acquiring an X-ray image. The control unit 107 causes no power supply to be performed during the time from time t1603 to time t1604 and from time t1607 to time t1608, which are two frames before acquiring the X-ray image.

[0185] When the control unit 107 confirms the reception of the shooting permission signal from the computer 103, it reads out the number of frames that do not supply power during blank reading, which is stored in the memory unit 115 in advance. In this example, the number of frames that do not supply power during blank reading is set to 2 frames. The control unit 107 operates so as not to transmit an irradiation permission signal to the computer 103 during the read two accumulation times (from time t1601 to time t1603 and from time t1604 to time t1607). After receiving the shooting permission signal from the computer 103, the control unit 107 causes the sensor unit 106 to perform two blank readings and transmits an irradiation permission signal to the computer 103 at time t1608.

[0186] Also, when the control unit 107 confirms the reception of the shooting permission signal from the computer 103, it transmits an EPT signal with the reason code Re-Ping to the non-contact power supply device 120 at time t1602. Further, the control unit 107 similarly transmits an EPT signal with the reason code Re-Ping to the non-contact power supply device 120 at time t1606. Note that the same drive can be performed for the dark image shooting in step S1306. That is, at the timing of obtaining the dark image in step S1306, a drive may be performed in which power supply is not performed during at least one or more blank readings before obtaining the dark image. As described above, it is possible to perform moving image shooting that avoids the influence on the signal wirings Sig1 to Sig3 during the blank reading time and improves the image quality of the first frame in particular.

[0187] Therefore, the non-contact power receiving unit 111 can transmit a temporary stop signal to the non-contact power supply device 120 so as to temporarily stop power supply during a stop period including the accumulation reset time of the X-ray imaging apparatus 105 in the accumulation reset operation of the X-ray imaging apparatus 105 before the X-ray image of the moving image is taken. In such a case, the image quality of the X-ray image following the accumulation reset operation can be improved.

[0188] (Modification example) In the above-described embodiment, the operation of the control unit 107 has been described based on the flowchart. However, the operation is related to the operation in non-contact power supply, and in the case of contact power supply or the like, the operation does not necessarily need to be based on the flowchart. Therefore, if it is non-contact power supply, the control unit 107 operates based on the flowchart already described, and if it is contact power supply, or if neither contact power supply nor non-contact power supply is performed and it is operating with the power of the battery 109, it does not necessarily need to operate based on the flowchart. Specifically, the control unit 107 can perform the determination of "whether non-contact power supply is currently in progress" prior to step S501, step S701, step S1101, or step S1301. In this case, if non-contact power supply is currently in progress, the processing of step S501, step S701, step S1101, or step S1301 is performed, and if not, at least the setting of the stop period is not performed, and the processing may be terminated.

[0189] Also, in the above-described embodiment, when non-contact power supply stops because the control unit 107 transmits an EPT signal of the reason code Re-Ping to the non-contact power supply device 120, the charging control unit 402 is set to supply power from the battery 109 to each block of the X-ray imaging device 105. Here, since the non-contact power receiving unit 111 operates with the power of non-contact power supply, information such as the required power of the non-contact power receiving unit 111 determined in the Negotiation phase is erased when non-contact power supply stops. Therefore, for example, when the Re-Ping Delay ends at time t609 and power supply resumes, the non-contact power receiving unit 111 needs to perform the processing of the Ping phase, Configuration phase, and Negotiation phase already described again. In this case, after performing these processes again, it is necessary to resume charging the battery 109 in the Power Transfer phase. In such processing, waste occurs in the processing because the processed operations are performed again.

[0190] Therefore, when the contactless power supply stops by the control unit 107 transmitting an EPT signal with the reason code Re-Ping to the contactless power supply device 120, the charging control unit 402 may be set to supply power from the battery 109 to the contactless power receiving unit 111 as well. In other words, the battery 109 can supply power to the contactless power receiving unit 111 during the period when the contactless power supply stops. Thereby, information such as the required power of the contactless power receiving unit 111 determined in the Negotiation phase can be held in a memory (not shown). Therefore, when the Re-Ping Delay ends and power supply resumes, the control unit 107 does not need to cause the contactless power receiving unit 111 to perform the processes of the Ping phase, Configuration phase, and Negotiation phase again. Accordingly, the control unit 107 can cause the contactless power receiving unit 111 to resume processing from the Power Transfer phase. Thereby, unnecessary processing can be eliminated.

[0191] In the first to fourth embodiments, the display unit 114 of the X-ray imaging apparatus 105 functions as an example of a notification means for notifying the user of warnings (error displays), power supply states, imaging states, and the like. However, the notification means for notifying warnings, power supply states, imaging situations, and the like is not limited to the display unit 114. For example, the X-ray imaging apparatus 105 may be provided with a speaker, a motor, or the like that functions as an example of a notification means, and warnings and imaging situations may be notified by sound, vibration, or the like. Further, a display unit, a speaker, or the like that functions as an example of a notification means may be provided in the computer 103, the X-ray control device 102, or the like.

[0192] (Other Embodiments) The present disclosure can also be implemented by supplying a program that realizes one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and causing one or more processors in a computer of the system or apparatus to read and execute the program. It can also be implemented by a circuit (for example, ASIC) that realizes one or more functions. The computer may have one or more processors or circuits and may include a plurality of separate computers or a network of a plurality of separate processors or circuits in order to read and execute computer-executable instructions.

[0193] The processor or circuit may include a central processing unit (CPU), a microprocessing unit (MPU), a graphics processing unit (GPU), an application-specific integrated circuit (ASIC), or a field-programmable gateway (FPGA). The processor or circuit may also include a digital signal processor (DSP), a data flow processor (DFP), or a neural processing unit (NPU).

[0194] The above disclosure includes the following configurations, methods, and programs. (Configuration 1) A radiation imaging apparatus, a sensor unit that detects radiation and outputs image data corresponding to the detected radiation, a power receiving unit that performs non-contact power reception, a radiation imaging apparatus including the above, a power supply device that supplies power to the radiation imaging apparatus in a non-contact manner, comprising: the power receiving unit transmits a pause signal including information indicating a pause period including a readout time of the image data of the radiation imaging apparatus to the power supply device, the power supply device stops the power supply during the pause period based on the pause signal and resumes the power supply after the pause period has elapsed, a radiation imaging system. (Configuration 2) The radiation imaging system according to Configuration 1, wherein the stop period further includes the accumulation time and the accumulation reset time of the radiation imaging apparatus, or the accumulation time of the radiation imaging apparatus. (Configuration 3) The radiation imaging system according to Configuration 1 or 2, wherein the stop period further includes a delay time from when the pause signal is transmitted until the power supply device stops the power supply. (Configuration 4) The readout time of the image data includes the readout time of the image data for the first imaging and the second imaging performed after the first imaging. The radiation imaging system according to Configuration 1, wherein the stop period further includes the accumulation time and the accumulation reset time of the radiation imaging apparatus for the second imaging. (Configuration 5) The radiation imaging system according to Configuration 4, wherein the stop period further includes the accumulation time and the accumulation reset time of the radiation imaging apparatus for the first imaging. (Configuration 6) The first imaging is one of imaging a radiation image using radiation and imaging a dark image without using radiation. The second imaging is the other of imaging the radiation image and imaging the dark image. The radiation imaging system according to Configuration 4 or 5, wherein the radiation image is corrected using the dark image. (Configuration 7) When a moving image of a radiation image is captured, the power receiving unit transmits the pause signal to the power supply device to temporarily stop the power supply during a stop period including the accumulation reset time of the radiation imaging apparatus every time an image of one frame is captured, according to any one of Configurations 1 to 6. (Configuration 8) The power receiving unit transmits a pause signal to the power supply device so as to temporarily stop the power supply during a stop period including the accumulation reset time of the radiation imaging apparatus in the accumulation reset operation of the radiation imaging apparatus performed before a moving image of a radiation image is captured, according to any one of Configurations 1 to 7. (Configuration 9) When the accumulation time of the radiographic apparatus is longer than a threshold value, the stop period is the accumulation time and the accumulation reset time of the radiographic apparatus, or the radiographic system according to Configuration 1 that does not include the accumulation time of the radiographic apparatus. (Configuration 10) The radiographic apparatus further includes a battery, When the remaining amount of the battery is less than a threshold value, the stop period is the accumulation time and the accumulation reset time of the radiographic apparatus, or the radiographic system according to Configuration 1 that does not include the accumulation time of the radiographic apparatus. (Configuration 11) The stop period is determined based on at least one of the imaging procedure, the size of the sensor unit, the clock signal of the drive circuit of the sensor unit, the conversion speed of analog-to-digital conversion in the sensor unit, and the presence or absence of simultaneous selection of imaging pixels in the sensor unit, in any of Configurations 1 to 10. (Configuration 12) The radiographic apparatus further includes an irradiation detection unit that detects radiation from the radiation irradiation apparatus, The power receiving unit transmits the pause signal in response to the irradiation detection unit detecting the radiation, in any of Configurations 1 to 11. (Configuration 13) The power receiving unit transmits the pause signal in response to the radiographic apparatus transmitting an irradiation permission signal, in any of Configurations 1 to 11. (Configuration 14) The radiographic apparatus transmits an irradiation permission signal after a predetermined time has elapsed since the pause signal was transmitted, in any of Configurations 1 to 11. (Configuration 15) When the delay time from when the pause signal is transmitted until the power supply device stops power supply is longer than the accumulation time of the radiographic apparatus, after the power receiving unit transmits the pause signal, the radiographic apparatus transmits an irradiation permission signal. When the delay time is less than or equal to the accumulation time, after the radiation imaging apparatus transmits an irradiation permission signal, the power receiving unit transmits the pause signal, and the radiation imaging system according to any one of Configurations 1 to 11. (Configuration 16) When the delay time from when the pause signal is transmitted until the power supply device stops power supply is greater than the time obtained by adding the accumulation time and the accumulation reset time of the radiation imaging apparatus, the radiation imaging apparatus re-sets the accumulation reset time so that the delay time is less than or equal to the time obtained by adding the accumulation time and the accumulation reset time, and the radiation imaging system according to any one of Configurations 1 to 15. (Configuration 17) The radiation imaging system further includes a notification unit that notifies a warning when the stop period is longer than a predetermined time, and the radiation imaging system according to any one of Configurations 1 to 16. (Configuration 18) The predetermined time is 12.6 seconds, and the radiation imaging system according to Configuration 17. (Configuration 19) The radiation imaging system further includes a notification unit that notifies that the radiation imaging apparatus is being powered, and the radiation imaging system according to any one of Configurations 1 to 16. (Configuration 20) The radiation imaging apparatus further includes a battery, and the battery supplies power to the power receiving unit during the stop period, and the radiation imaging system according to Configuration 1. (Configuration 21) A sensor unit that detects radiation and outputs image data corresponding to the detected radiation, A power receiving unit that performs non-contact power reception, and the power receiving unit transmits a pause signal including information indicating a stop period including the readout time of the image data to a power supply device that performs non-contact power supply to the power receiving unit, and causes the power supply device to stop the power supply during the stop period based on the pause signal and resume the power supply after the stop period has elapsed, and a radiation imaging apparatus. (Method 1) A radiographic apparatus comprising a sensor unit that detects radiation and outputs image data corresponding to the detected radiation, and a power receiving unit that performs non-contact power reception, and a power feeding device that performs non-contact power feeding to the radiographic apparatus. A method of operating a radiographic system, comprising: transmitting, by the power receiving unit, a pause signal including information indicating a pause period including a readout time of the image data of the radiographic apparatus to the power feeding device; stopping, by the power feeding device, the power feeding during the pause period based on the pause signal, and resuming the power feeding after the pause period has elapsed; A method of operating a radiographic system, comprising the above steps. (Method 2) A method of operating a radiographic apparatus comprising a sensor unit that detects radiation and outputs image data corresponding to the detected radiation, and a power receiving unit that performs non-contact power reception, the method comprising: transmitting, by the power receiving unit, a pause signal including information indicating a pause period including a readout time of the image data to a power feeding device that performs non-contact power feeding to the power receiving unit, and causing the power feeding device to stop the power feeding during the pause period based on the pause signal and resume the power feeding after the pause period has elapsed; A method of operating a radiographic apparatus, comprising the above steps. (Program 1) A program that, when executed by a processor, causes the processor to execute each step of the method of operating a radiographic system described in Method 1 or the method of operating a radiographic apparatus described in Method 2.

[0195] The present disclosure has been described above with reference to the embodiments, but the present disclosure is not limited to the above embodiments. Inventions modified within the scope not contrary to the gist of the present disclosure, and inventions equivalent to the present disclosure are also included in the present disclosure. Further, the above-described embodiments can be appropriately combined within the scope not contrary to the gist of the present disclosure.

Description of Reference Numerals

[0196] 100: Radiographic system 105: X-ray imaging apparatus (radiographic apparatus) 106: Sensor unit 120: Non-contact power supply device (power supply device)

Claims

1. A radiographic apparatus, a sensor unit that detects radiation and outputs image data corresponding to the detected radiation; a power receiving unit that performs non-contact power reception; a radiographic apparatus including the above; a power supply device that supplies power to the radiographic apparatus in a non-contact manner; comprising: the power receiving unit transmits a pause signal including information indicating a pause period including a readout time of the image data of the radiographic apparatus to the power supply device; the power supply device stops power supply during the pause period based on the pause signal, and resumes power supply after the pause period has elapsed. A radiographic imaging system.

2. The radiographic imaging system according to claim 1, wherein the pause period further includes an accumulation time and an accumulation reset time of the radiographic apparatus, or further includes the accumulation time of the radiographic apparatus.

3. The radiographic imaging system according to claim 1, wherein the pause period further includes a delay time from when the pause signal is transmitted until the power supply device stops power supply.

4. The readout time of the image data includes the readout time of the image data related to the first imaging and the second imaging performed after the first imaging, The radiographic imaging system according to claim 1, wherein the pause period further includes an accumulation time and an accumulation reset time of the radiographic apparatus related to the second imaging.

5. The radiographic imaging system according to claim 4, wherein the pause period further includes an accumulation time and an accumulation reset time of the radiographic apparatus related to the first imaging.

6. The first imaging is one of imaging a radiographic image using radiation and imaging a dark image without using radiation, The second imaging is the other of imaging the radiographic image and imaging the dark image, The radiographic imaging system according to claim 4 or 5, wherein the radiographic image is corrected using the dark image.

7. When a radiographic image of a moving image is captured, the power receiving unit transmits the pause signal to the power supply device every time an image of one frame is captured. The radiographic imaging system according to claim 1.

8. The power receiving unit transmits a pause signal to the power supply device so as to temporarily stop power supply during a pause period including the accumulation reset time of the radiographic apparatus in the accumulation reset operation of the radiographic apparatus performed before a radiographic image of a moving image is captured. The radiographic imaging system according to claim 1 or 7.

9. When the accumulation time of the radiographic apparatus is longer than a threshold value, the stop period does not include the accumulation time and the accumulation reset time of the radiographic apparatus, or the accumulation time of the radiographic apparatus. The radiographic imaging system according to claim 1.

10. The radiographic apparatus further includes a battery, When the remaining amount of the battery is less than a threshold value, the stop period does not include the accumulation time and the accumulation reset time of the radiographic apparatus, or the accumulation time of the radiographic apparatus. The radiographic imaging system according to claim 1.

11. The stop period is determined based on at least one of the imaging technique, the size of the sensor unit, the clock signal of the drive circuit of the sensor unit, the conversion speed of analog-to-digital conversion in the sensor unit, and the presence or absence of simultaneous selection of imaging pixels of the sensor unit. The radiographic imaging system according to claim 1.

12. The radiographic apparatus further includes an irradiation detection unit that detects radiation from a radiation irradiation device, The power receiving unit transmits the temporary stop signal in response to the irradiation detection unit detecting the radiation. The radiographic imaging system according to claim 1.

13. The power receiving unit transmits the temporary stop signal in response to the radiographic apparatus transmitting an irradiation permission signal. The radiographic imaging system according to claim 1.

14. The radiographic apparatus transmits an irradiation permission signal after a predetermined time has elapsed since the temporary stop signal was transmitted. The radiographic imaging system according to claim 1.

15. When the delay time from when the temporary stop signal is transmitted until the power supply device stops power supply is longer than the accumulation time of the radiographic apparatus, after the power receiving unit transmits the temporary stop signal, the radiographic apparatus transmits an irradiation permission signal. When the delay time is less than or equal to the accumulation time, after the radiographic apparatus transmits an irradiation permission signal, the power receiving unit transmits the temporary stop signal. The radiographic imaging system according to claim 1.

16. When the delay time from when the temporary stop signal is transmitted until the power supply device stops power supply is greater than the combined time of the accumulation time and the accumulation reset time of the radiographic apparatus, the radiographic apparatus re-sets the accumulation reset time so that the delay time is less than or equal to the combined time of the accumulation time and the accumulation reset time. The radiographic imaging system according to claim 1.

17. The radiographic system according to claim 1, further comprising notification means for notifying a warning when the stop period is longer than a predetermined time.

18. The radiographic system according to claim 17, wherein the predetermined time is 12.6 seconds.

19. The radiographic system according to claim 1, further comprising notification means for notifying that the radiographic apparatus is being powered.

20. The radiographic apparatus further includes a battery, The battery supplies power to the power receiving unit during the stop period. The radiographic system according to claim 1.

21. A sensor unit that detects radiation and outputs image data corresponding to the detected radiation; A power receiving unit that performs non-contact power reception; Comprising: The power receiving unit transmits a pause signal including information indicating a stop period including the readout time of the image data to a power supply device that supplies power to the power receiving unit in a non-contact manner, and causes the power supply device to stop the power supply during the stop period based on the pause signal, and resume the power supply after the stop period has elapsed. A radiographic apparatus.

22. A method of operating a radiographic system including a radiographic apparatus that detects radiation and outputs image data corresponding to the detected radiation, and a power supply device that supplies power to the radiographic apparatus in a non-contact manner, the method comprising: Transmitting, by the power receiving unit, a pause signal including information indicating a stop period including the readout time of the image data of the radiographic apparatus to the power supply device; Stopping, by the power supply device, the power supply during the stop period based on the pause signal and resuming the power supply after the stop period has elapsed; A method of operating a radiographic system including:

23. A method of operating a radiographic apparatus including a sensor unit that detects radiation and outputs image data corresponding to the detected radiation, and a power receiving unit that performs non-contact power reception, the method comprising: Transmitting, by the power receiving unit, a pause signal including information indicating a stop period including the readout time of the image data to a power supply device that supplies power to the power receiving unit in a non-contact manner, and causing the power supply device to stop the power supply during the stop period based on the pause signal, and resume the power supply after the stop period has elapsed; A method of operating a radiographic apparatus including:

24. A program that, when executed by a processor, causes the processor to execute each step of the method of operating a radiation imaging system according to claim 22 or the method of operating a radiation imaging apparatus according to claim 23.

Images