JP6141052B2 - Radiographic control device - Google Patents

Description

  The disclosure of the present specification relates to a radiation imaging control device, a radiation imaging device, a radiation imaging system, a notification device, and a program for causing a computer to execute these control methods and control processing.

  In recent years, digitization of radiation images such as X-ray images in medical treatment has been advanced. As a radiographic image capturing method, a digital radiographic apparatus that forms an image by converting radiation into an electrical signal by using a plurality of radiation detecting elements arranged in a two-dimensional matrix instead of a film has been put into practical use. Yes. By using such a radiation imaging apparatus, for example, a captured image can be immediately confirmed on a display device or the like, so that there is an advantage that diagnosis can be made more efficient.

  When performing X-ray imaging using a digital radiography apparatus, it is desirable to match the timing of X-ray irradiation and the timing of charge accumulation (imaging) by the detector due to the characteristics of the solid state detection element used. In the X-ray imaging system described in Patent Document 1, X-ray irradiation and imaging timing are synchronized by exchanging synchronization signals between the X-ray generator and the FPD. In the X-ray imaging system described in Patent Document 2, the X-ray irradiation timing is detected by detecting a change in current generated inside the FPD when the FPD is irradiated with X-rays, and triggered by the change. Can be synchronized by starting shooting.

  Patent Document 3 discloses that a notification unit notifies a non-accumulation state and an accumulation state of a detector, and accordingly, an operator of the system starts X-ray irradiation at an appropriate timing. An image can be obtained.

Japanese Patent No. 4684747 JP-A-11-155847 JP-A-2005-13272

  When the operator takes an image at the timing, it is necessary to perform X-ray irradiation within the duration of the accumulation state by the detector. However, in the conventional method, it is difficult to predict the timing for switching from the notification of the non-accumulated state to the notification of the accumulated state, so that the burden on the operator is large and improvement in operability is desired.

  Therefore, a radiography control apparatus according to one of the embodiments of the present invention includes a setting unit that sets a waiting time until radiation imaging starts according to an operation input from the operation unit, and a setting by the setting unit, Determining means for determining whether or not the standby time has elapsed from the time based on the instruction to start timing of the standby time, and in a state where charge can be accumulated in the radiation sensor in response to the determination of the elapse of the standby time. Control means for making a transition; and display control means for displaying on the display section a display indicating that it is a period during which radiation should not be irradiated before the elapse of the waiting time is determined, and the display control means Is characterized by displaying a display indicating that radiation can be irradiated in response to the determination of the elapse of the waiting time.

  In this way, since the waiting time until the transition to the accumulation state can be set, the radiation sensor accumulation state can be started and radiation imaging can be executed at the timing desired by the operator.

It is a figure which shows the structural example of the radiography system which concerns on embodiment of this invention. It is a figure which shows the structural example of the radiation sensor which concerns on embodiment, and its peripheral circuit. It is a figure which shows the structural example of the radiography system which has a portable radiography apparatus based on embodiment. 1 is an external view of a portable radiation imaging apparatus according to an embodiment. It is a flowchart which shows the example of the flow of imaging | photography operation | movement by a radiography system. It is a figure which shows the example of the operation part and display part which concern on embodiment. It is a flowchart which shows the example of the flow of switching operation | movement of the imaging | photography mode by a radiography system. It is a figure which shows the structural example of the radiography system which has an imaging | photography control apparatus independent of a radiation sensor based on embodiment. It is a flowchart which shows the example of the flow of imaging operation | movement of the radiography system which has an imaging | photography control apparatus. It is a figure which shows the example of the display screen displayed on a display part. (A) is an example of a standby time setting screen, (b) is an example of a countdown display screen, and (c) is a diagram showing an example of a display screen showing that irradiation is possible. It is a figure which shows the structural example of the radiography system which has a portable radiography apparatus and an imaging | photography control apparatus independent from this based on embodiment. It is a flowchart which shows the example of the flow of imaging operation | movement of the radiography system which has a portable radiography apparatus and an imaging | photography control apparatus independent from this. It is a flowchart which shows the example of the flow of imaging | photography operation | movement using a radiation detection circuit. It is a figure which shows the hardware structural example of a portable radiography apparatus and an imaging | photography control apparatus.

  A configuration example of the radiation imaging system according to the embodiment will be described with reference to FIG.

  The radiation imaging system includes a radiation generator 100. The radiation generation apparatus 100 includes a radiation source 110, a radiation aperture 111, a high voltage power supply 120, a generation control circuit 130, a generation apparatus operation unit 145, and an irradiation switch 140. For example, the radiation source 110 includes a reflection type or transmission type target and an electron source that generates electrons that collide with the target, and generates radiation by causing the electrons to collide with the target. The radiation diaphragm 111 has a plurality of radiation shielding members, and shapes the radiation bundle into a desired shape by appropriately arranging these shielding members. For example, the cross section perpendicular to the irradiation direction is rectangular or circular. It is shaped to be The high voltage power source 120 generates a voltage for accelerating the electrons generated from the electron source. The generation control circuit 130 controls the generation of radiation.

  The generator operation unit 145 is an operation unit for setting conditions for generating radiation to be generated. For example, generation conditions are input in the form of tube current, tube voltage, mAs value, and the like. In response to this, the generation control circuit 130 controls the operation according to the generation conditions. The irradiation switch 140 is a switch for controlling the generation timing of radiation. When the first switch 141 in the first stage is pressed, a rotor up signal is input to the generation control circuit 130, and the generation control circuit 130 is the radiation source 110. The rotation of the anode is started. When the second stage 2nd switch 142 is pressed in a state where the rotor up is completed, an exposure signal is input to the generation control circuit 130, and generation of radiation is started. Although the rotor-up is not required for the transmission type target, the control flow of the preparation operation by the 1st switch 141 and the start of exposure by the 2nd switch 142 may not be changed. Alternatively, in the case of a transmission type target, it is possible to provide only one switch.

  The radiation generated from the radiation generating apparatus 100 is detected by a radiation sensor 210 that is appropriately positioned. The radiation imaging system will be described below.

  The radiation imaging system includes a radiation sensor 210, a drive circuit 220, a readout circuit 230, a sensor control unit 240, a determination unit 241, a timer 242, an operation unit 250, a setting unit 260, a display unit 270, and a display. A control unit 271 and a memory 280 are included. These signals can be exchanged through a wired wireless network or electrical connection. The system is controlled by the sensor control unit 240, the determination unit 241, the timer 242, the operation unit 250, the setting unit 260, and the display control unit 271. The radiation sensor 210, the drive circuit 230, the sensor control unit 240, and the memory 280 are included in the radiation imaging unit. The sensor control unit 240, the determination unit 241, the setting unit 260, and the display control unit 271 are implemented by, for example, an FPGA. In order to realize the functions and processes of these units described later, configuration data of the logic circuit on the FPGA is generated using a hardware description language, and the configuration of the FPGA is set using this.

  The radiation sensor 210 has a plurality of pixels that store charges in response to reception of radiation arranged in a two-dimensional matrix, and has a storage mode for storing charges and a read mode for reading an electrical signal based on the stored charges. . For example, the radiation sensor 210 is provided with a row selection line connected to the drive circuit 220 for each row and a column signal line connected to the readout circuit 230 for each column. Each pixel has a PIN or MIS type photoelectric conversion element and a TFT for connecting the photoelectric conversion element to a column signal line. A column selection line is connected to the base side electrode of the TFT, and is turned on and off by the drive circuit 220. Be controlled. When the TFT is turned on, an accumulation state or accumulation mode in which charges are accumulated in the pixel is set. When the TFT is turned off, a reading state or reading mode for reading the accumulated charges is entered.

  The timing at which the radiation sensor 210 is changed from the read mode to the accumulation mode is controlled by the operation unit 250, the setting unit 260, the timer 242, the determination unit 241, and the sensor control unit 240. The operation unit 250 is a hard button, a soft button displayed on the display screen on the display unit 270, or the like, and inputs a time from the user for setting a standby time and an instruction input to start a shooting operation. Accept. The setting unit 260 stores the input time information in the memory as standby time information. Further, in response to an instruction input from the operation unit 250, the radiation imaging system starts measuring the waiting time.

  The timer 242 includes, for example, a clock pulse generator and a counter circuit that repeatedly counts up at regular intervals using the clock pulse and outputs a count value. The determination unit 241 repeatedly performs a determination process of monitoring the timer 242 and determining whether the standby time has elapsed from the time when the confirmation input is received. In this way, the timer 242 and the determination unit 241 can determine whether the standby time input by the user has elapsed.

  After this standby time has elapsed, the sensor control unit 240 performs control to transmit the control signal for instructing the mode transition to the drive circuit 220, for example, and cause the radiation sensor 210 to transition to the accumulation mode. As a result, the radiation sensor 210 can be placed in an accumulated state after waiting for a desired time input by the user.

  By providing a user-variable waiting time before transition to the accumulation mode, the start timing of the accumulation mode can be set to a timing desired by the user. For example, if there is no problem even if radiation imaging is started immediately, it is possible to immediately enter the accumulation state and start imaging by setting the standby time to 3 seconds or less or 1 second or less. Here, it is of course possible to set the standby time to 0 seconds, that is, to set the storage state immediately according to the instruction without waiting. On the contrary, the waiting time can be set to about 10 seconds when the timing is matched with the subject or when it is desired to have a margin.

  If the user depresses the irradiation switch 140 in accordance with the transition to the accumulation state and causes the radiation generating apparatus 100 to generate radiation, the radiation sensor 210 in the accumulation state can accumulate charges according to the intensity of the radiation. . Thereafter, for example, after a predetermined fixed accumulation time has elapsed, the sensor control unit 240 outputs an instruction to the drive circuit 220 in accordance with the end of the accumulation period, and causes the radiation sensor 210 to transition to the reading mode. The electric signal read by the reading circuit 230 is amplified and A / D converted to generate digital radiation image data. The memory 280 stores this digital radiation image data. The memory 280 stores various imaging conditions and set values in addition to the radiation image data. The image confirmation terminal 275 includes, for example, a communication unit capable of wired and wireless communication, a display control unit, and a display unit. The digital radiation image data is received by the communication unit, and the display control unit displays the data on the display unit. It is also possible to transmit and save an image to an external server or the like via a communication unit by wired or wireless communication.

  Here, the radiation imaging system can include a display unit 270 and a display control unit 271. For example, the display control unit 271 causes the display unit 271 to display a display indicating that it is a period during which radiation irradiation should not be performed until the standby time elapses after an instruction is input. As a result, the user can also grasp from the display unit 270 the period that should not be accumulated. Further, for example, the display control unit 271 causes the display unit 270 to display a display indicating that irradiation should be started in response to the passage of the standby time or the transition to the accumulation mode. As a result, the user can also grasp the timing for photographing from the display unit 271.

  In addition, the display control unit 271 displays on the display unit 270 a display corresponding to the remaining time until the time at which radiation is to be irradiated, so that it is very easy for the user to grasp the timing at which the irradiation switch should be pressed. As the display corresponding to the remaining time until the standby time elapses, for example, the display unit 270 may be a countdown display of the remaining time or a display that shortens the LED blinking step by step.

  In addition, a radiation generation unit IF (interface) 222 that electrically connects the radiation imaging system and the radiation generation apparatus 100 can be provided in the radiation imaging system according to the embodiment. The radiation generation unit IF222 is a unit for transmitting and receiving a synchronization signal for synchronizing the radiation generation and the accumulation mode with the radiation generation apparatus 100. If the radiation generating apparatus 100 is provided with an interface for outputting the generation timing of radiation, the interfaces can be connected and synchronized. In one example of the exchange of synchronization signals, when the 1st switch 141 is pressed and the rotor up is completed, and the 2nd switch 142 is pressed, the generation control circuit 130 outputs a signal requesting radiation exposure permission. . This signal is received by the radiation generator IF222. In response to this, the sensor control unit 240 shifts the radiation sensor 210 to the accumulation mode. At this time, control for reading out the charges accumulated in the radiation sensor 210 and other predetermined initialization processing may be performed. In response to the transition to the accumulation mode, the sensor control unit 240 transmits an exposure permission signal through the radiation generation unit IF222. In response to this, the generation control circuit 130 generates radiation from the radiation source 110. By performing such synchronous control, radiation imaging by the radiation sensor 210 can be reliably performed by the same operation as a conventional analog film in which an irradiation switch is pressed. However, depending on the difference between the manufacturer of the radiation generating apparatus 100 and the radiation imaging system and the type of the radiation generating apparatus 100, there are some that do not have an interface. In such a case, radiation imaging using the radiation sensor 210 can be easily performed by the user adjusting the irradiation timing by the above-described timer control and display control.

  In addition, the radiation detection circuit 221 can be provided in the radiation imaging system according to the embodiment. The radiation detection circuit 221 is used for obtaining an image by detecting irradiation of radiation from the radiation generation apparatus 100 when synchronization with the radiation generation apparatus 100 as described above cannot be achieved. For example, the radiation detection circuit 221 monitors the pixel of the radiation sensor 210 and detects the generation of radiation by monitoring the current output from the pixel. Alternatively, in addition to the radiation sensor 210, a dedicated sensor using a semiconductor element or the like that is sensitive to radiation can be disposed on the front surface or the back surface of the radiation sensor 210, and radiation irradiation can be detected according to the output of the sensor. The radiation sensor 210 can obtain a radiographic image by setting the readout mode until, for example, before the detection of radiation irradiation, and changing to the accumulation mode according to the detection of radiation irradiation. In another example, accumulation and reading can be repeated before detection of radiation irradiation, and radiation image data can be generated using data read during the period of radiation irradiation.

  Although the radiation sensor 210 can be controlled by the radiation detection circuit 221, when special imaging is performed, for example, when imaging is performed with a very low dose, detection of radiation is delayed and appropriate imaging may not be performed. In addition, when a radiation detection circuit is used, it is necessary to operate the radiation sensor with a predetermined drive before detecting radiation.

  Among the imaging control using the timer (first control) described above, imaging control using the radiation detection circuit (second control), synchronous imaging control using the radiation generator IF222 (third control), Which shooting mode is to be used should be appropriately selected according to the system configuration, the environment in which shooting is performed, shooting conditions, and the like. For example, the setting unit 260 switches the shooting mode setting according to an operation from the operation unit 250 or an external signal. When performing synchronous imaging, the imaging mode setting value is stored in the memory as 0, when the radiation irradiation detection circuit is used, the imaging mode setting value is set as 1, and when imaging using a timer is performed, 2 is stored in the memory. By referring to the set values as appropriate, the operation is performed in the mode set at the time of shooting.

  Based on FIG. 2, the structural example of the radiation sensor 210 and the circuit accompanying it is demonstrated. FIG. 2 shows a solid-state imaging device of a radiation sensor 210 in which a plurality of pixels (two-dimensional sensors) are arranged in a two-row × two-column two-dimensional matrix for simplification and a circuit associated therewith. Actually, a pixel having pixels of several thousand rows × thousand columns is used as the X-ray sensor unit. The number of rows and columns of pixels and the number of pixels are not limited. In one embodiment, a phosphor that converts radiation into visible light is stacked on the solid-state imaging device. In another example, the solid state imaging device itself converts radiation into an electrical signal.

  The pixel of the radiation sensor 210 includes a photoelectric conversion element 207 and a TFT (Thin Film Transistor) 204 connected to one end thereof. A bias power source 209 is connected to the other end of the photoelectric conversion element 207 via a bias line 206. The TFT 204 functions as a switch element that switches connection / disconnection between the photoelectric conversion element 207 and the column signal line 202. A row selection line is connected to the base side electrode of the TFT 204. The TFT 204 is controlled by the drive circuit 220 via a common row selection line 201 for each row. The drive circuit 220 has, for example, a shift register that sequentially outputs a signal in one direction, and a voltage is sequentially applied to one row selection line 201 in accordance with an input clock pulse, and a voltage is applied accordingly. The TFT 204 connected to the row selection line 201 is turned on. The operation of turning on the TFT 204 by applying a voltage is referred to as row selection, and the sequential row selection is referred to as scanning of the radiation sensor 210. The above-described readout mode or readout state refers to a state in which scanning is sequentially performed in the embodiment of FIG. Further, the above-described accumulation mode or accumulation state refers to a state in which any TFT 204 used for image generation in the embodiment of FIG.

  As photoelectric conversion elements, various elements using amorphous silicon or polysilicon are known in addition to CCDs. In such an element, it is known that charges due to dark current accumulate even in a non-irradiation state, regardless of the photoelectric conversion method. Such a charge due to the dark current causes noise particularly when photographing with a minute signal, and not only deteriorates the image quality but also decreases the sensitivity of the photoelectric conversion element. For this reason, even in the no-signal state, a reset operation is required for the purpose of periodically removing charges due to dark current accumulated in the element. It should be noted that charges cannot be accumulated during the reset operation, so that a desired image cannot be obtained even when X-ray irradiation is performed. The reset operation is executed in a read mode using the TFT 204, for example. In another example, a reset-dedicated TFT in addition to the TFT 204 may be connected to the photoelectric conversion element.

  An electric signal read from the radiation sensor 210 via the column signal line is input to the reading circuit 230. The reading circuit 230 includes, for example, an amplifier and an AD converter, and amplifies the read analog electric signal and converts it into a digital value to obtain digital radiation image data. Actually, this digital radiographic image data corresponds to both so-called dark charges that are generated even if the photoelectric conversion element 207 does not receive light in addition to the charge obtained by the photoelectric conversion element 207 in response to radiation irradiation. Since it is data, a dark current correction circuit for correcting the dark current data component corresponding to the dark charge is provided. In addition, a so-called gain correction for correcting variations in sensitivity of each pixel and a defective pixel correction circuit for correcting defective pixels can be provided.

  An example of driving using the radiation detection circuit 221 will be described. The sensor control unit 240 drives the drive circuit 220 to perform a scan that turns on the TFT 204 for one or more rows for a certain period. When a pulse signal is supplied from the driving circuit 220 to the TFT 204, the TFT 204 is turned on for a certain period. The order of scanning and the number of rows at which the TFTs 204 are simultaneously turned on are not limited.

  The drive circuit 220 performs scanning until it detects X-ray irradiation under the control of the sensor control unit 240. When all the scanning lines are driven, the X-ray imaging apparatus 101 repeats driving again from the scanning line that was driven first.

  While the scanning line is being driven, the radiation detection circuit 221 converts the current flowing through the bias line 206 connected to the bias power supply 209 into digital through a current-voltage conversion circuit, an amplifier, an AD converter, and a signal processing circuit. Convert to value. The comparator compares the digital value with a predetermined threshold value, and outputs a signal indicating the comparison result to the sensor control unit 240 or the like as an X-ray irradiation detection signal. Here, if the digital value exceeds a predetermined threshold, the sensor control unit 240 can determine that there is a change in the current flowing through the bias line 206 and X-ray irradiation has been detected. In addition, the radiation detection circuit 221 sequentially stores the digital values in a storage circuit. The state in which these operations are performed corresponds to the X-ray irradiation detection state. The bias power source 209 is for supplying a bias voltage to the photoelectric conversion element 207.

  The sampling frequency of the AD converter is arbitrary, and sampling may be performed a plurality of times at the timing when the TFT 204 of a certain scanning line is turned on. Is desirable in data processing. Further, in a state where a certain scanning line is selected, the digital value when the TFT 204 is turned on and the digital value when the TFT 204 is turned off are acquired, and the difference between them is calculated. It is desirable to perform correlated double sampling. This is because resistance to extraneous noise can be increased. The digital value is sequentially updated in synchronization with scanning. Therefore, it is desirable that the storage circuit has a capacity capable of sequentially overwriting and updating the digital value and holding at least one digital value for all scanning lines.

  When X-rays are irradiated from the X-ray tube 102, electric charges are generated in the photoelectric conversion element 207 due to light emission from a phosphor layer (not shown) and flow out to the bias line 206. As a result, a change occurs in the current flowing through the bias line 206. The radiation detection circuit 221 detects this change in current through the above-described circuits (current-voltage conversion circuit, amplifier, AD converter, and signal processing circuit), and instructs the sensor control unit 240 to stop the above-described scanning. Output. As a result, the X-ray sensor unit 201 transitions to a charge accumulation state caused by X-ray irradiation. When scanning is stopped, the storage circuit stops updating the digital value and holds the digital value, and the sensor control unit 240 sets a scanning line number (scanning line position information) for specifying the scanning line for which scanning is stopped. Store in a register (not shown). Note that it is not always necessary to use the scanning line number if the position where scanning is stopped can be specified.

  Based on an instruction from the sensor control unit 240, the drive circuit 220 controls various operation states such as reset, radiation detection drive, charge accumulation, or readout. Note that the operation for accumulating electric charges is equivalent to the operation for capturing an X-ray image of a subject, and will be referred to as an image capturing operation below.

  In the present embodiment, an example is shown in which the current flowing through the bias line 206 is used to detect X-ray irradiation. However, if a current that flows through the X-ray imaging apparatus 101 and has a value that changes due to detection of X-ray irradiation, the current that flows through the bias line 206 is not necessarily used.

  A configuration example of the radiation imaging system will be described with reference to FIG. In the example illustrated in FIG. 3, the portable radiography apparatus 200 includes a radiation sensor 210, a drive circuit 220, a readout circuit 230, a sensor control unit 240, a memory 280, and a battery 290 housed in a casing. In addition to the above-described shooting control function, the sensor control unit 240 includes a display control unit, a timer 242, a determination unit, and a setting unit 260. Here, the sensor control unit 240 is implemented by, for example, a single or a plurality of FPGAs. The battery 290 is a power source for supplying power to each unit in the radiation imaging apparatus 200.

  In one embodiment, a separate notification unit 600 is connected to the radiation imaging apparatus 200 in a wired or wireless manner. The notification unit 600 is an example of an indicator relating to radiation imaging using the radiation sensor 201. The display unit 270 disposed on the side surface of the housing of the radiation imaging apparatus 200 is hidden by the subject as in the case where the radiation imaging apparatus 200 is disposed on the back side of the subject lying on the bed, for example. Even if it is, the operator is provided to inform the operator of the state of the radiation imaging apparatus 200. The notification unit 600 includes a notification display unit 610, a notification light emitting unit 620, a notification sound generation unit 630, and a notification control unit 640. The notification display unit 610 displays information such as character strings and icons on a liquid crystal display, for example. The notification light emitting unit 620 has an LED or the like and notifies the state of the radiation imaging apparatus 200 by a light emission pattern. The notification sound generation unit 630 emits sound through a speaker. It has the alerting | reporting control part 640 which controls these units. The notification control unit 640 receives the first signal indicating the start of the waiting time measurement and the second signal indicating that the waiting time has elapsed from the start of the time measurement via a wired or wireless connection. Further, the notification control unit 640 determines that the notification according to the remaining time until the standby time elapses before the elapse of the standby time set by the setting unit 260 and the elapse of the standby time are determined. In response to this, the notifying unit is notified that the irradiation should be started. By using such a separate notification device, the operator can grasp the timing of irradiation from a position away from the X-ray detection device.

  FIG. 4 is an external view of a portable radiation imaging apparatus 200 in the present embodiment. An operation unit 250 and a display unit 270 are arranged on the first side surface of the flat housing. As the operation unit 250, two selection buttons and a button for performing a confirmation input are arranged. Further, a power button 251 for switching the power ON / OFF of the radiation imaging apparatus 200 is disposed on a side surface different from the operation unit 250. The battery 290 is detachably disposed on the back side of the radiation incident surface on the radiation incident direction side.

  In addition to the example of FIG. 4, the operation unit 250 and the like can be arranged at arbitrary locations within a range that does not affect shooting.

  In another example, the operation unit 250 and the display unit 270 are provided in a remote controller device different from the radiation imaging apparatus 200, and an infrared signal from the remote controller apparatus is received by an infrared communication unit provided on the radiation imaging apparatus 200 side. If this is done, it is possible to easily set the operation even after the radiation imaging apparatus 200 is positioned.

  In yet another example, the operation unit 250, the display unit 270, the wireless communication circuit, and the battery and the housing for storing the battery are remote controllers that can be attached to and detached from the radiation imaging apparatus 200, and communicate with the wireless communication circuit on the radiation imaging apparatus 200 side. Make it possible. When it is removed and used, an operation signal is exchanged through a wireless communication circuit so that the radiation imaging apparatus 200 can be operated. When it is attached, it can be handled easily if the battery can be supplied with power through a metal terminal. If this detachable remote control is further provided with the function of the above-mentioned notification unit 600, the usability is further improved.

  An example of the imaging operation of the radiation imaging system having the above-described configuration will be described based on FIG. The following example is an operation example in an imaging mode in which the operator adjusts the timing of radiation generation and radiation imaging by the radiation sensor 210 using the timer and the display of the display unit.

  First, the operation of the radiation generating apparatus 100 is started (S100). Next, in the radiation generation apparatus, the generation control circuit 130 sets X-ray irradiation conditions in response to an operation input from the generation apparatus operation unit 145 provided in the radiation generation apparatus (S110). Here, the X-ray irradiation conditions are, for example, irradiation conditions determined by conditions relating to generated X-rays such as tube current, tube voltage, and irradiation time parameters, and the distance between the radiation aperture 111 and the radiation sensor 210 or the subject. There are range conditions, etc. The radiation diaphragm 111 may be interlocked with the operation of the generator operation unit 145 or may be manually set separately. After setting the X-ray irradiation conditions, the generation control circuit 130 repeats the determination process for determining whether or not the irradiation button is pressed in step S120. If it is determined that the irradiation switch has been pressed, the process proceeds to step S130, where the generation control circuit 130 controls the high-voltage power supply 120 to generate radiation from the radiation source 110. The generation control circuit 130 repeats the determination process as to whether or not the next shooting is continuously performed. If there is no next shooting, the operation is terminated. If the next shooting is continued, the irradiation condition is set again in step S110.

  Before and after the above-described operation, the imaging system on the radiation sensor 210 side is activated and the operation is started. At the start of operation, a shooting mode is selected based on an external signal, an operation input from the operation unit 250, or default setting information (S200). In the example of FIG. 5, the shooting mode by the timer 242 is selected.

  Next, the setting unit 260 sets a standby time until photographing through an operation input from the operation unit 250 (S210). Here, the waiting time until the irradiation is set to the time from when the shooting start button is pressed (S220) until the actual shooting operation is performed. For example, when the shooting system and the irradiation switch 140 are located at a distance, By setting a certain time, the irradiation switch 140 can be operated with a margin after the imaging system and the subject are aligned. Conversely, by shortening the set time, it may be easier to perform irradiation timing control. It is possible for the operator to set the most appropriate shooting timing in accordance with these various situations and perform shooting. The set value is input to the timer 242 and the determination unit 241 that measure the standby time, and is also input to the display control unit 241 to display the remaining time of the standby time.

  Here, the setting unit 260 can set not only the standby time but also the accumulation time (S215). The accumulation time is an amount that determines the length of a period during which the TFT 204 of the radiation sensor 210 is turned off after the standby time has elapsed. The longer the accumulation time, the longer the irradiation time can be dealt with, and in the case of imaging using the timer 242, the operator can easily take the timing. On the other hand, when the storage time is short, the dark current storage time is shortened, so that the dynamic range and image quality can be improved. The setting unit 260 also sets the accumulation time according to the operation input from the operation unit 250 according to various situations. The set value is input to the sensor control 240 and used for drive control of the drive circuit 220.

  After the above setting, the determination unit 241 repeats the determination process as to whether or not the shooting start button has been pressed (S220). Here, the shooting start button is provided on the operation unit 250, for example, and an instruction signal for starting the measurement of the standby time by the timer 242 is input to the determination unit 241 in response to being pressed. In other imaging modes, for example, when radiation irradiation is detected by the radiation detection circuit 221, irradiation start determination processing by the detection circuit 221 is started in response to an instruction to start imaging. In the case of imaging using the radiation generation unit IF222, the sensor is caused to perform standby driving that repeats the accumulation mode and the reading mode, and waits for an irradiation permission request signal via the radiation generation unit IF222. The above-described operation is a case where the standby time is set to a positive value. When the standby time is set to 0, the time measurement processing of the standby time in S240 is omitted, and the accumulation operation is started for the sensor control unit 240. Will be instructed.

  In response to the input of the instruction signal, the determination unit 241 and the timer 242 start measuring time in step S240, and the display control unit 271 displays the remaining time of the standby time on the display unit 270 and sequentially updates the display. . Here, the timer 242 may be activated in accordance with a photographing instruction, or may start sampling of a clock from a clock pulse generator that continues to operate. The timer 242 sequentially outputs the counter value, and the determination unit 241 continues the determination process based on the counter value to determine whether or not the standby time has elapsed since the imaging start instruction signal is received. The display control unit 271 refers to the counter value output from the timer 242, calculates the remaining time as appropriate, and causes the display control unit 270 to display the remaining time. Alternatively, the determination unit 241 may determine the remaining time by comparing the standby time with the elapsed time in addition to the determination of the standby time. In this case, for example, the display control unit 271 receives the remaining time information from the determination unit 241 and causes the display unit 270 to display the information. During the countdown, for example, as shown in FIG. 4D, the remaining time until photographing is displayed. At this time, it is also possible to display the countdown by, for example, an LED lighting pattern or sound.

  When the set standby time has elapsed, the sensor control unit 240 places the radiation sensor 210 in the accumulation state via the drive circuit 220 (S241). In order to stabilize the radiation sensor 210 by repeating a predetermined initialization process, for example, the read mode and the accumulation mode a predetermined number of times before setting the accumulation state, the accumulation operation of step S240 is performed so that the accumulation operation can be started simultaneously with the end of the standby time. An initialization operation is performed during the countdown display process.

  In accordance with the elapse of the set standby time and the start of accumulation, the display control unit 271 displays on the display unit 270 that “X-ray irradiation is possible” (S250). This display indicates that when radiation is irradiated during the display, the radiation sensor 210 detects the irradiated radiation and a radiation image can be obtained. Furthermore, it shows that the radiation irradiation period can be included in the accumulation period of the radiation sensor 210 within a predetermined irradiation time. In addition to the display unit 270 or in place of the display on the display unit 270, the display is performed in a separate notification unit 600 as shown in FIG. When it is arranged on the back side, the driving state of the radiation sensor 210 is easy to understand and it is easy to take timing.

  The display control unit 271 continuously displays that the irradiation is possible for the set accumulation time, and the display ends before the timing when the accumulation ends (S250).

  Here, for example, even if radiation irradiation is started immediately before the indication that radiation irradiation may be performed on the display unit 270 ends, prior to the end of the accumulation period, the radiation irradiation is settled in the accumulation period. The display is terminated. For example, when the allowable radiation irradiation time is 300 msec and the accumulation time is 3000 msec, the display control of the display control unit 271 is performed so that the display on the display unit 270 ends when 2700 msec has elapsed from the start of accumulation. . As described above, the display control 271 and the sensor control unit 241 operate so that the period during which the radiation imaging is permitted is longer than the accumulation operation period by the radiation sensor 210. By doing so, it is possible to reduce the possibility that the period during which the radiation is irradiated exceeds the accumulation period and causes ineffective exposure.

  Here, for example, instead of setting the accumulation time by the setting unit 260, if the setting unit 260 sets a period during which the display unit 270 continues to display radiation imaging, the operation unit 250 when viewed from the operator. The start of radiation irradiation is allowed only during the period set via, and the usability is improved. Alternatively, the accumulation time and the radiation irradiation time are acquired in accordance with an operation input from the operation unit 250, the period during which the radiation irradiation is permitted is calculated by the setting unit 260, and the display control unit 271 displays the display unit 270. If it is made to display by, it will become easier for an operator to take a timing.

  The operator confirms the display and presses the irradiation button 140 while the display continues, so that the X-ray irradiation is performed (S120 and S130). Thereafter, the sensor control unit 240 ends the accumulation operation by the radiation sensor 210 (S260), and operates the readout circuit 230 to obtain radiation image data. The radiation image data is subjected to sensor characteristic correction processing such as dark current correction, gain correction, and defect correction in the image processing circuit (S270). For example, the image processing circuit is mounted on the FPGA together with the sensor control unit 240. In addition, high quality processing such as gradation conversion, dynamic range compression processing, and noise reduction processing may be performed by the image processing circuit. Thereafter, the processed radiation image data is displayed on the display unit 270 and the image confirmation terminal 275 (S280). Thereafter, it is determined whether or not the next shooting is continued (S285). When it is continued, it proceeds to the standby time setting process again, and when it is not continued, the operation is terminated. For example, it is determined whether or not to continue the operation in response to the button of the operation unit 250 being pressed.

  As described above, in a system that does not electrically synchronize the timing of X-ray irradiation and imaging as in this embodiment, the timing at which X-ray irradiation can be performed, that is, the timing at which accumulation is performed is clearly indicated to the user. It is important to notify them. If the notification timing and the actual accumulation timing are deviated, there is a possibility that X-ray irradiation may be performed at an inappropriate timing, and unnecessary exposure is imposed on the patient to be imaged. In order to avoid such problems, display is possible after the start of accumulation, and the display that can be irradiated is terminated before the end of accumulation, so that accumulation is reliably performed during the display of possible irradiation. I have control.

  By doing in this way, it is possible to capture an X-ray image by reliably matching the X-ray irradiation timing and the X-ray imaging timing.

  Based on FIG. 6, the structural example of the operation part 250 and the alerting | reporting part 270 is demonstrated. In accordance with the operation input from the operation unit 250, the setting unit 260 takes in these operation inputs and sets them as operating conditions of the radiation imaging apparatus 200. In the example illustrated in FIG. 6, an operation unit 250 including three buttons is provided. Two of these buttons are buttons for selecting numerical values and characters. By pressing each button, numbers and characters can be selected and input one by one. Information on the selected numerical values and characters is stored in a temporary memory by the setting unit 260 and is appropriately updated according to the input. In response to the input, the display control unit 271 refers to the temporary memory and causes the display unit 270 to display the currently selected numerical value or character. Another button of the operation unit 250 is a button for performing a confirmation input for confirming the input numerical value, and the setting unit 260 sets the currently selected numerical value or character as an operation condition in accordance with the confirmation input. . Therefore, the user operates the operation unit 250 to select numerical values and characters, confirms the display on the display unit 270, and presses the operation unit 250 to confirm the set value. FIG. 6A is a screen for setting a waiting time until photographing, and is a screen for performing an operation input corresponding to the setting processing in step S210. The standby time is set by the setting unit 260 in response to pressing of the Enter button on the operation unit 250. FIG. 6B is a screen for performing an operation input corresponding to the accumulation time setting process in step S215. The accumulation time is set by the setting unit 260 in response to pressing of the Enter button on the operation unit 250. FIG. 6C shows a screen when an operation input corresponding to the instruction to start shooting in step S220 is performed. An instruction signal for instructing the determination unit 241 to start measuring the waiting time is output from the operation unit 250 to the determination unit 241 in response to pressing of the Enter button of the operation unit 250. FIG. 6D shows a display on the display unit 270 corresponding to the countdown display in step 240. FIG. 6E shows a display indicating that the start of radiation irradiation in step S250 is permitted.

  The display unit 270 is not limited to the display as shown in FIG. 6, and may be a lighting display using a plurality of LEDs, or may be a form using a speaker or the like without being limited to the display. Further, the operation unit 260 is not particularly limited in its form, such as a voice input means using a scroll wheel, dial, barcode reader, or microphone. In addition to a push button, a touch panel sensor or the like can also be used. It is also possible to use buttons on the GUI displayed on the display unit 270 using a touch panel display as the display unit 270 and the operation unit 250.

  The operation mode setting process will be described with reference to FIG. This processing is processing corresponding to the preprocessing in step S210 in relation to the embodiment of FIG.

  In step S2001, the sensor control unit 240 activates the operation unit 250, the setting unit 260, the display control unit 271, and the display unit 270. In addition, power is supplied from the bias power source 209 to the radiation sensor 210. The power is also supplied to the drive circuit 220. At this time, power supply to the radiation sensor 210 may not be performed.

  In step S2002, the operation unit 250 receives an operation input instructing a shooting mode from the operator. For example, the operation unit 250 is provided with buttons corresponding to each shooting mode, and each operation mode is instructed when the user presses the button. In step S2003, the setting unit 260 determines whether or not the instructed operation mode is a synchronous mode. When it is determined that the mode is not the synchronous mode, in step S2004, the setting unit determines whether or not the instructed operation mode is the auto trigger mode. If it is determined that the mode is not the auto trigger mode, in step S2005, the setting unit determines that the mode is the manual synchronization mode, that is, the shooting mode using the timer 242, and starts the operation in the manual synchronization mode in step S2005. In the operation in step S2005, for example, the same processing as that described with reference to the flowchart of FIG. 5 is performed. In step S2006, the setting unit 260 determines whether or not there has been an operation input instructing mode change. If there is a change instruction, the process proceeds to step S2003. In step S2007, the setting unit 260 determines whether or not to end shooting, for example, whether or not there is such an operation input from the operation unit 250. If not, the process proceeds to step S2005 to continue the operation in the manual synchronization mode.

  On the other hand, when it is determined in step S2003 that the mode is the synchronous mode, the operation of the imaging mode using the radiation generation unit IF222 is started (S2008). Here, for example, Ping is transmitted from the setting unit 260 or the sensor control unit 240 to the radiation generation unit IF 222 to confirm connection and power-on of the radiation generation unit IF 222. Further, the connection with the radiation generation apparatus via the radiation generation unit IF222 is confirmed. When the connection is confirmed, the radiation imaging system performs an operation in the synchronous mode via the radiation generation unit IF222. Here, the setting unit 260 determines whether or not a problem (error) has occurred in the operation in the synchronous mode, for example, the connection between the radiation generation unit IF 222 and the sensor control unit 240 cannot be confirmed (S2009). When it is determined that there is no problem, the operation is continued. However, when it is determined that there is a problem, it is determined that the operation in the synchronization mode is impossible, and the setting unit 260 sets the manual synchronization mode. In this way, even when radiography cannot be performed in the synchronous mode, radiography can be performed without waiting for repair or problem solving, and emergency radiography can be handled.

  The case where it is determined that it is impossible to continue the synchronous mode operation may not be able to confirm the connection between the radiation generation unit IF222 and the radiation generation apparatus in addition to the above-described example. For example, when the radiation generation unit does not have a connection interface with the radiation generation unit IF 222 as in the example of FIG. 1, if the connection is simply cut off, the connection is physically connected but the electrical connection The case where it is not carried out is considered. If the display control unit 271 displays the contents of the problem on the display unit 270 for each problem type, the operator can easily confirm the system configuration and solve the problem. Furthermore, if the mode is changed from the synchronization mode to the manual synchronization mode according to the mode change approval input from the operation unit 260, the possibility of operating in an unintended shooting mode and causing erroneous shooting can be reduced. .

  Since the mode change determination process in step S2010 and the end determination process in step S2011 are the same as the processes in steps S2005 and S2006, description thereof will be omitted.

  If it is determined in step S2004 that the auto trigger mode has been instructed, the radiation imaging system starts operation in the imaging mode using the radiation detection circuit 221 (S2012). The sensor control unit 240 starts power supply to the radiation detection circuit 221 and causes the radiation sensor 210 to start driving as necessary. Here, when a problem occurs in the radiation detection circuit 221, the setting unit 260 determines whether a problem has occurred in the operation in the auto trigger mode (S2013). When it is determined that there is no problem, the operation is continued. However, when it is determined that there is a problem, it is determined that the operation in the auto trigger mode is impossible, and the setting unit 260 sets the manual synchronization mode. In this way, even if radiography cannot be performed in the auto trigger mode, radiography can be performed without waiting for repair or problem solving, and emergency radiography can be handled. .

  The case where it is determined that the auto-trigger mode operation cannot be continued may be a generation condition in which the radiation detection circuit 221 cannot detect the start of irradiation in addition to the above-described example. When radiation is generated at a very low dose or radiation is performed at an extremely short time, it may be difficult for the radiation detection circuit 221 to detect the start of radiation irradiation at an appropriate timing. In such a case, it is desirable to operate in a synchronous mode or a manual synchronous mode. For example, the setting unit 260 determines suitability between the imaging mode and the irradiation condition by determining whether or not the operation in the auto trigger mode is possible under the irradiation condition input via the operation unit 260. In addition, when the remaining power of the battery 290 is below a predetermined threshold, the auto-trigger mode with large power consumption is prohibited, and the mode is shifted to the manual synchronization mode, so that even when the remaining power is low More shooting can be performed.

  Since the mode change determination process in step S2014 and the end determination process in step S2015 are the same as the processes in steps S2005 and S2006, description thereof will be omitted.

  The above-described shooting mode setting information set by the setting unit 260 is stored in the memory 280 as a setting value, for example. A set value is stored in the memory 280 in response to an operation input from the operation unit 250, and it is determined that there is a problem and it is determined that the operation in the set shooting mode is impossible, and the set value is changed for the bundle eye. It will be. It is not necessary to start the shooting operation in each shooting mode immediately after the setting. For example, the shooting operation may be started in response to an operation input from the operation unit 250.

  Here, the setting value information of the imaging mode is referred to by the sensor control unit 240, the setting information of the imaging mode is added to the radiographic image data obtained every time imaging is performed, and the radiographic image data and the setting information are associated with each other. And stored in the memory 280. If the associated data set is transmitted to an external device such as an external image confirmation terminal 275 or PACS, the photographing mode can be confirmed after photographing. The setting value information of the shooting mode may be given on the image confirmation terminal 275 side, for example.

  In this way, radiography suitable for the situation can be executed by the operator appropriately selecting imaging in a plurality of imaging modes.

  Another embodiment of the present invention will be described with reference to FIG. In this example, the configuration of the timer 242 and the like is provided in an imaging control apparatus 300 different from the portable radiation imaging apparatus 200. The imaging control device 300 functions as a control device of a radiation imaging system as a modality. The imaging control apparatus 300 is an apparatus housed in a separate housing different from the radiation imaging apparatus 200, and communicates and operates wirelessly without physical connection. Although the example of FIG. 8 has a function as a control device of the radiation imaging apparatus 200, it is not limited thereto, and may have a function as a control apparatus such as setting an irradiation condition for the radiation generation apparatus 100. The imaging control apparatus 300 is also connected to the in-hospital network, receives radiation imaging order information from a RIS (Radiology Information System), and transmits captured images to a PACS (Picture Archiving and Communication Systems). The imaging control apparatus 300 includes, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), a HDD (Hard Disk Drive), and a communication circuit. Then, a computer program including instructions for realizing the processing described in the flowchart of FIG. 9 to be described later is stored in a ROM or HDD, and the function of the photographing control device 240 is read out by the CPU and read and executed as appropriate. Is realized. Of the configurations shown in FIG. 8, configurations with the same reference numerals as those described above have the same functions unless otherwise specified, and description thereof may be omitted.

  An operation unit 250 and a setting unit 260 of the imaging control apparatus 300 are for performing various settings of the radiation imaging apparatus 200, and for controlling various operation states such as reset, charge accumulation, or readout. . The display control unit 271 displays setting values for performing various settings and the state of the radiation imaging apparatus 200 on the display unit 270 and also displays an image captured by the radiation imaging apparatus 200 on the display unit 270. As the imaging control device 300, a dedicated unit may be used, or a general-purpose personal computer or tablet computer installed with dedicated software may be used. In such a case, a keyboard or mouse connected to a computer can be used as the operation unit 250. Alternatively, a unit having a dedicated operation button may be connected as the operation unit 260. In addition to using a monitor connected to the computer as the display unit 270, a GUI button can be used as the operation unit 250 in the case of a monitor having a touch panel device.

  By separating the radiation imaging apparatus 200 and the imaging control apparatus 300 in this way, various settings can be made after the preparation for imaging is advanced, for example, the radiation imaging apparatus 200 is placed under the subject. become. In addition, there are advantages such as easier operation.

  In the present embodiment, the imaging control apparatus 300 and the radiation imaging apparatus 200 have a terminal-side communication circuit 395 for performing communication with each other. A dedicated interface and protocol may be used for communication, or a general-purpose communication protocol such as Ethernet (registered trademark) may be used. Also, a proximity communication protocol such as Bluetooth can be suitably used. It can also be used in combination with wired communication.

  When the imaging control device 300 communicates with the RIS or PACS, the imaging control device 300 may communicate with the terminal side communication circuit 395. However, a communication circuit different from this may be provided to communicate with the RIS or PACS. Can do.

  In addition to the terminal-side communication circuit 395, the imaging control apparatus 300 includes a control circuit that controls each unit in the apparatus in an integrated manner. Unless otherwise specified, the operation mainly performed by the imaging control apparatus 300 is performed under the control of the control circuit.

  The radiation imaging apparatus 200 includes a communication circuit 295, and the communication circuit 295 receives information on the imaging mode, the accumulation time, and the standby time set by the setting unit 260 from the terminal-side communication circuit 395. The communication circuit 295 transmits the radiation image data obtained by the radiation imaging apparatus 200 to the imaging control apparatus 300 and displays it on the display unit 270.

  FIG. 10 is a flowchart showing an operation when performing X-ray imaging by the radiation imaging system shown in FIG. 8 based on FIG. 9. Operation flows in the imaging control apparatus in addition to the radiation generation apparatus and the radiation imaging apparatus are shown. Items that operate in the same manner as in FIG. 5 are indicated by basically the same numbers, and description thereof may be omitted.

  In step S115, the generation control circuit 130 repeatedly performs a determination process for determining whether or not the 1st switch 141 of the irradiation switch 140 of the radiation generating apparatus 100 is pressed. When it is determined that the 1st switch 141 is pressed, the tube rotor of the radiation source 110 is started to rotate up. When a transmission type target other than the rotary anode type is used for the radiation source 110, a predetermined preparation start operation, for example, an operation start of the cooling mechanism is performed. Here, depending on the type of tube, it may take several seconds for the rotor to rise, and if the accumulation time is set to be very short, it may not be in time if the 1st switch is pressed after accumulation starts. is there. In such a case, it is desirable to execute the 1s switch 141 during the countdown display process in step S340. Accordingly, the display control unit 271 of the imaging control apparatus 300 displays a message indicating that the 1st switch 141 should be pressed together with the countdown display. Thus, the operator can synchronize the timing of radiation generation and transition to the accumulation mode by pressing the 1st switch according to the display in consideration of the time required for the preparation operation on the generator side.

  In step S300, the imaging control apparatus 300 starts operation. For example, the imaging control apparatus 300 communicates with the RIS in response to an instruction from the operation unit 250 and acquires imaging order information. Thereafter, the setting unit 260 of the imaging control device 300 performs setting of a waiting time until the start of accumulation (S310) and setting of an accumulation time (S315).

  Here, since the standby time is set according to the situation and the operator, if the setting unit 260 sets the standby time and the storage time according to the imaging order from the RIS, the standby time is set for the operation unit 250. Operation input is unnecessary and efficient. For example, when the subject is to hold the portable radiation imaging apparatus 200, such as imaging a leg in a free position, it is desirable to start imaging immediately after positioning once, so the setting unit 260 shortens the waiting time. Set. Further, for example, when the timing adjustment is timed, for example, when the timing is synchronized with the breathing of the subject, for example, in the lung field imaging, the setting unit 260 sets the standby time longer.

  When the input of the setting value is completed, the shooting start button is pressed (S220). The shooting sequence is started when the button is pressed, and the set waiting time is counted down (S230). The details of this process are the same as those in FIG.

  If the determination unit 241 determines that the set waiting time has elapsed, the imaging control apparatus 300 transmits a signal for instructing the radiation imaging apparatus 200 to start accumulation by the terminal side communication circuit 395 accordingly (S340). . When receiving the accumulation start signal, the sensor control unit 240 of the radiation imaging apparatus 200 starts accumulation. After that, almost simultaneously, the sensor control unit 240 receives the accumulation start signal through the communication circuit 295 and transmits a reception notification signal for notifying that the accumulation is started to the imaging control apparatus (S245). When the terminal side communication circuit 395 receives the reception notification signal (S345), the display control unit 271 immediately causes the display unit 270 to display a display indicating that irradiation is possible (S350).

  The display control unit 271 displays the display continuation time (display) so that irradiation can be performed for a time obtained by subtracting the time required from transmission of the accumulation start signal to reception of the reception notification signal from the set accumulation time. Period) is controlled. In this way, the irradiation possible display is not performed before the accumulation is actually started and after the accumulation is completed, and at least as long as the radiation irradiation switch 140 is pressed according to the display, the display is invalid for the subject. The possibility that exposure will occur can be reduced.

  The imaging control apparatus 300 monitors the time from the transmission of the accumulation start signal to the reception of the reception notification signal, for example, by the timer 242 and the determination unit 241 and determines that the accumulation start notification signal has not been received for a predetermined time or more. In such a case, the indication that irradiation is possible is not performed. Although there is a possibility of more than communication, it is possible that, for example, there is a possibility that the radiation imaging apparatus 200 has some trouble and the accumulation cannot be started because the communication with the radiation imaging apparatus 200 cannot be performed. Reduces the possibility of ineffective exposure.

  In this case, the terminal side communication circuit 395 transmits an accumulation start signal only after a new shooting start button of the operation unit 260 is pressed again. In this way, when the determination unit 241 determines that there is a communication abnormality, the transmission timing is controlled so that the accumulation start signal is transmitted after waiting for a time shorter than the standby time set in advance. . Further, for example, it is possible to adopt a control in which the waiting time is set to 0 and an accumulation start signal is transmitted immediately after the photographing start button is pressed. In this way, particularly when a long standby time is employed, it is possible to suppress a decrease in efficiency and an increase in the burden on the subject due to waiting for a long standby time again.

  Further, it is possible to adopt a process for shortening the standby time only when the standby time is longer than a predetermined threshold. Alternatively, an operation button and a message for requesting approval for shortening the standby time are displayed on the display unit 270, and it is controlled whether or not the standby time is changed according to an operation input from the operation unit 250. Thus, it is possible to start photographing again at the timing desired by the operator.

  After the accumulation is completed (S260), the radiation imaging apparatus 200 performs image processing and data transmission processing, and the radiation image data captured by the communication circuit 295 is transmitted to the imaging control apparatus 300. The radiation image data transmitted on the imaging control device 300 side is additionally subjected to image processing or the like as necessary, and is stored in the memory (S370). In response to the reception, the display control unit 271 displays on the display unit 270 (S380). When shooting is continued, the setting is repeated from the setting of the waiting time until shooting again (S310). When the repeated imaging is not performed, the operations of the radiation generation apparatus 100, the radiation imaging apparatus 200, and the imaging control apparatus 300 are stopped assuming that the end of imaging is instructed. When the imaging control apparatus 300 is connected to the PACS, the subject information, the part information, and the performed imaging performed on one or more pieces of radiographic image data acquired before stopping the operation are included in each imaging order. Send with information.

  Based on FIG. 10, an example of a screen displayed on the display unit 270 in the processing from the standby time / accumulation time setting processing (S310 and S315) to the irradiation enabled display (S350) will be described.

  FIG. 10A is an example of a setting screen displayed on the screen of the display unit 270. On the screen, a display area 270a for displaying the standby time and a display area 270b for displaying the accumulation time are displayed. Also, a button 250a for increasing the standby time displayed in the display area 270a by a predetermined unit, a button 250b for decreasing the standby time, and a storage time displayed in the display area 270b are decreased by a predetermined unit. Button 250c and a button 250d for decrementing are displayed. These buttons are pressed by a selection button of the operation unit 250 in the same manner as a cursor whose position is controlled via the operation unit 250, so that the numerical value displayed in the display area 270a or 270b is changed. Control. Also, a shooting start button 250e for instructing the start of shooting and a cancel button 250f for canceling shooting settings are displayed. These are also pressed through an operation input from the operation unit 250. When the cancel button 250f is pressed, the display control unit 271 stops the display of FIG. 10A and displays a screen for displaying, for example, shooting reservation information. When one is selected from the shooting reservation information through the operation input, the display control unit 271 displays the display screen of FIG. 10A for setting the standby time and the storage time corresponding to the selected shooting reservation. Display again. As described above, the standby time and the accumulation time until the shooting is started can be input on the GUI via the operation unit 250, respectively. The operation unit 250 may be a keyboard, or other operation units such as voice input can be used.

  An example of countdown display on the display unit 270 will be described with reference to FIGS. For example, when a display having a large screen capable of displaying a radiographic image is used as the display unit 270, the remaining time until imaging is displayed on the screen of the display device during the countdown, for example, as shown in FIG. Is done. In addition, a display “Preparing for Shooting” indicates that the state is before shooting. At the same time, for example, it is useful when the operator needs to move to a position where the display unit 271 cannot confirm by performing countdown by voice from a speaker (not shown). Further, by displaying characters and icons indicating that only the first switch 141 of the irradiation switch should be pressed, the possibility of invalid irradiation can be reduced.

  In the example of the display screen in FIG. 10C, the indication “being imaged” indicates that radiation irradiation is permitted. Further, it is possible to know that it is time to depress the 2nd switch 142 by a character display and an icon indicating that the 2nd switch should be depressed. In addition, since the operator can know the remaining irradiation possible period by displaying the remaining time until the end of imaging, for example, when the remaining time is short as shown in FIG. It is possible to make a determination such as pressing the imaging start button 250e to start accumulation again, and as a result, the possibility of invalid exposure can be reduced.

  Based on FIG. 11, the structural example of the radiation system which concerns on other embodiment is demonstrated.

  In the example shown in FIG. 11, as in the embodiment shown in FIG. 3, the sensor control unit 240 has a single component necessary for the manual synchronization mode such as the timer 241 and the determination unit 241, and is provided on the photographing control device 300 side. Also has a timer. The functions of the terminal-side determination unit 341, terminal-side timer 342, terminal-side operation unit 350, terminal-side setting unit 360, terminal-side display unit 370, and terminal-side display control unit 371 are determined as shown in FIG. The same as the unit 241, the timer 242, the operation unit 250, the setting unit 260, the display unit 270, and the display control unit 271. In addition, it is assumed that the same reference numerals as those described above have the same functions, and different configurations and different processes from the previous embodiment will be described.

  The example of the radiation imaging system illustrated in FIG. 11 includes a notification unit 600 connected to the imaging control device 300 by a wireless or wired cable. The notification unit 600 has the same function as the notification unit 600 in the example shown in FIG. Thereby, even when it is necessary to press the irradiation button 140 at a position where the display unit 270 of the imaging control device 300 is not visible, it is possible to know an appropriate irradiation timing.

  The radiation imaging apparatus 300 includes a determination unit 241, a timer 242, a setting unit 260, a display unit 270, and a display control unit 271, but does not include the operation unit 250, and the standby time and the accumulation time are set. The communication circuit 295 is to receive from the imaging control device 300. Of course, in order to deal with various situations, an operation unit 250 may be provided to allow operation input from the radiation imaging apparatus 300.

  The radiation detection circuit 221 is a radiation detection sensor provided outside the portable radiation imaging apparatus 300, for example, and is connected to the drive circuit 220 by wire, for example.

  FIG. 12 is a flowchart showing an operation when performing imaging in the above-described radiation imaging system.

  In this embodiment, after the imaging start button of the imaging control unit 300 is pressed (S320), the terminal-side transmission circuit 395 of the imaging control apparatus 300 transmits an accumulation start reservation signal to the radiation imaging apparatus 200 (S330). . The accumulation start reservation signal is a signal for instructing accumulation for a set time after a set waiting time has elapsed. Prior to or prior to the accumulation start reservation signal, the standby time and accumulation time information are input from the terminal side communication circuit 395 to the sensor control unit 240 through the communication circuit 295, and the setting unit 260 stores the standby time and accumulation time information in the memory. Retained.

  When the sensor control unit 240 of the radiation imaging apparatus 200 confirms reception of the accumulation start reservation signal (S230), it transmits a reception notification signal to the imaging control apparatus 300 (S235). The display control unit 271 starts a countdown display for the set standby time.

  On the other hand, when the imaging control device 300 receives the reception notification signal (S335), the display control unit 271 starts a countdown display in the imaging control device 300 (S340). Specifically, the display unit 270 displays the remaining time until the start of shooting. When the notification unit 600 is connected, the notification control unit 640 of the leaving unit 600 receives a signal from the imaging control device 300 that the waiting time is started. In response to reception, the LED of the notification light emitting unit 620 blinks, the remaining time numerical value display on the notification display unit 610, and the voice notification on the notification sound generation unit are performed. The notification by the notification unit 600 may be performed by appropriately receiving the output information of the terminal-side determination unit 341 and changing the notification form according to the remaining time, or by measuring the remaining time by the notification control unit 640 and taking a picture. Notification control may be performed independently of the control device 300.

  Here, as in the example shown in FIG. 9, at this time, if the period from the transmission of the storage start reservation signal (S330) to the reception of the reception notification signal (S335) exceeds a predetermined timeout time, the terminal side determination unit If the reception notification signal is not received within the predetermined period, the terminal-side display control unit 371 does not count down as a communication failure and the terminal-side display unit 370 has an abnormality in communication. The effect is displayed with characters or icons. In this case, there are a case where transmission of the accumulation start reservation signal has failed and a case where transmission has succeeded but reception of an ACK signal has failed. When the reception of the ACK signal has failed, the radiation sensor 210 starts accumulation after a predetermined time, so that the imaging control device 300 stops the waiting time counting and the transition to the accumulation state. The signal is output.

  After the countdown display is started on each of the display unit 270 and the terminal-side display unit 370, the sensor control unit 240 and the imaging control device 300 confirm the communication state regularly or irregularly (S345, S245). . The communication status may be confirmed by, for example, sending a specified command and receiving a response to the command. If there is no received response within a predetermined time-out period, the countdown is stopped as a communication failure, and the display unit 270 and the terminal indicate that fact. Displayed on the side display unit 370. In this communication status confirmation process, time stamp data indicating the start time of a transmission attempt from a transmission source is added to commands that communicate with each other and transmitted and received, thereby measuring the communication delay time during countdown display, that is, immediately before accumulation. It is possible. When this process is performed, it is desirable to execute a communication synchronization process for setting the clocks of both apparatuses at the timing before the shooting start button is pressed.

  When the display control unit 271 of the radiation imaging apparatus 200 ends the countdown display of the set standby time, the sensor control unit 240 causes the radiation sensor 210 to start an accumulation mode (S241). At substantially the same time, the sensor control unit 240 causes the communication circuit 295 to transmit an accumulation start notification signal (S245). When the imaging control device 300 receives this accumulation start notification signal (S345), a display to the effect that irradiation is possible is performed on the terminal side display unit 370. When the notification unit 600 is connected, the notification unit 600 notifies that irradiation is possible. By doing this, it is possible to prevent erroneous irradiation possible display before the actual accumulation is started.

  Furthermore, when the accumulation start notification signal cannot be received within the time-out period after the countdown display on the terminal side display unit 370 or the notification on the notification unit 600 is completed, the irradiation ready display is not performed. The timeout time is a value for limiting the time from when an attempt to transmit a signal is started until the ACK signal indicating that the signal is received is received. Even if an ACK signal is received after the time-out period, it is determined that transmission has failed. This timeout period is determined based on a range defined in the communication protocol standard and user settings.

  The notification that irradiation is possible is performed for a time obtained by subtracting the above-described timeout time from the set accumulation time. By doing in this way, it is possible to avoid the notification that the irradiation is possible after the accumulation is completed (S260), and it is possible to avoid unnecessary exposure to the subject by performing radiation irradiation according to the display. Furthermore, the possibility of exposure is further reduced by notifying that irradiation is possible only for the time obtained by subtracting the timeout time and the irradiation time of radiation from the accumulation time. The irradiation time is information set based on either the operation input by the generator operation unit 145 of the radiation generation apparatus 100 or the imaging order information acquired from the RIS by the communication circuit of the radiation generation apparatus 100, for example, the terminal side operation unit 350. It is acquired when the operator inputs via. The imaging control apparatus 300 transmits this irradiation time to the radiation imaging apparatus 200 through the terminal side communication circuit 395. If an irradiation condition is attached to the RIS imaging order, information received from the RIS is used as it is as irradiation time information. Alternatively, there may be a case where the irradiation conditions can be exchanged with the radiation generation apparatus 100 even though it does not have an interface for synchronous imaging. In this case, the irradiation conditions obtained from the radiation generation apparatus 100 are used.

  The user can synchronize the accumulation timing and the X-ray irradiation timing by pressing the irradiation button 140 (S120) while the irradiation is possible.

  In another example, even when the radiation sensor 210 is operated in the above-described manual synchronization mode, the radiation detection sensor 221 is powered and operated. For example, when radiation imaging with a very low dose is performed, it may be possible to detect radiation irradiation itself without considering the timing, even if detection of the start of radiation irradiation cannot be performed at an appropriate timing. As a result, when the user accidentally presses the radiation irradiation switch 140 or when the radiation sensor 210 performs irradiation regardless of the imaging preparation state due to some trouble, the radiation detection circuit 221 has irradiated. For example, the display unit 270 and the notification unit 600 notify the detection result. Thereby, it can be easily grasped by the operator at an appropriate timing that there is a problem in photographing.

  As described in the above embodiment, in the manual synchronization mode, the waiting time from the user's instruction to the start of accumulation can be arbitrarily set, so that the user can obtain the desired signal without exchanging the synchronization signal with the radiation generator. Shooting can be started at the timing. In addition, since it becomes easier for the user to grasp the time from the start point before the start of storage to the start of storage, it is less necessary to pay attention to know the timing of the start of storage, and X-ray irradiation is performed beyond the storage period. The possibility that it will be reduced can be reduced.

  In addition, by using this manual synchronization mode together with the auto trigger mode, it is possible to cope with many imaging conditions without exchanging synchronization signals with the radiation generator. In the case of general imaging conditions, the auto-trigger mode can be used to reduce the labor of the operator. On the other hand, for example, when the dose is very small or the X-ray irradiation time is extremely short, the manual synchronization mode is used. Thus, radiation imaging can be performed reliably. With the radiation imaging apparatus having the mode (2), even if the radiation generation apparatus does not have an interface circuit for inputting / outputting a synchronization signal, digital radiation imaging can be executed under a wide range of imaging conditions.

  Compared to the auto trigger mode, the manual synchronization mode does not require a detection circuit or a sensor scan, so that power consumption can be reduced.

  In the above-described embodiment, the case of taking an X-ray image has been described. However, the same applies to the case of taking images using other types of radiation, such as α rays, β rays, γ rays, and other electromagnetic waves. The effects of the invention can be obtained.

  In the above-described embodiment, when a communication circuit such as the communication circuit 295 or the terminal-side communication circuit 395 transmits data, the counterpart device is transmitted by specifying an IP address, for example. However, the present invention is not limited to this. . For example, it may be transmitted by broadcast that does not specify only the other party. In this case, for example, the device of the communication partner is designated in advance for each photographing unit, and the IP address of the transmission source is included in the transmitted / received data. Of the data received by the receiving device, only the signal from the designated device may be selectively used for control.

  In the above-described embodiment, the display by the display unit 270 and the terminal-side display 370 and the notification by each unit of the notification unit 600 may be collectively referred to as notification.

  Based on FIG. 13, a flow of imaging control when imaging is performed in an imaging mode using the radiation detection circuit 221 will be described.

  First, the operation of each of the X-ray generation apparatus 100, the X-ray detection apparatus 200, and the control means 300 is started (S100, S200, S300). Next, in the X-ray generator, X-ray irradiation conditions such as tube current, tube voltage, and writing time are set (S110). In the control means, various imaging conditions such as patient information input / confirmation and examination order input / confirmation are set (S301). The shooting conditions can be set using setting means or operation means provided in the control means. In the present embodiment, a general personal computer can be used as the control means. In such a case, a keyboard or a mouse connected to the computer can be suitably used as the setting means or the operation means. Alternatively, a unit having a dedicated operation button may be connected. In addition to being used as a display unit, a display device connected to a computer can be used as a setting unit or an operation unit by displaying a GUI button or the like.

  Next, in the control means, a shooting mode is selected (S305).

  When the imaging mode 1 using the radiation detection circuit 221 and the imaging mode 2 using the timer 242 (manual synchronization mode) are compared, the imaging mode 1 is more convenient, such as less restrictions on the imaging timing. Therefore, in this embodiment, the shooting mode is the shooting mode 1 immediately after the start of the operation. The user can change the photographing mode as necessary in consideration of the set irradiation condition, photographing condition, subject condition (body shape, photographing part, etc.) or other photographing restrictions. For example, it is expected that X-ray detection is difficult, such as imaging at a low dose, imaging in a very narrow irradiation area, or imaging under conditions where there is no X-ray directly incident on the radiation sensor 210. In this case, for example, the shooting mode 2 is automatically selected by the setting unit 260 through an input by the operator through the operation unit 250 or using information on the shooting conditions.

  The shooting mode can be changed by clicking on a GUI button arranged on the screen of the display unit 270. Note that the method of changing the mode is not limited to this method. For example, a method of selecting from the menu of software or switching the tab for each mode may be used. Alternatively, a dedicated mode changeover switch may be used for the operation unit of the imaging control apparatus 300 or the radiation imaging apparatus 200. However, as described below, since the operation flow differs greatly between the two imaging modes, for example, when a changeover switch is provided on the radiation imaging apparatus 200 side, the selected mode is definitely reflected in the operation unit and the display unit. Need to be done. Note that the mode immediately after the start of the operation may be the shooting mode 2.

  When the imaging mode is determined in the imaging mode 1, next, an irradiation detection start signal is transmitted to the radiation imaging apparatus 200 (S331). When receiving the irradiation detection start signal (S231), the sensor control unit 240 of the radiation imaging apparatus 200 causes the radiation sensor 210 to immediately start the X-ray irradiation detection operation. The detection operation continues until X-rays are actually irradiated and the presence of X-rays is detected, or until a predetermined timeout time elapses.

  Further, after starting the irradiation detection operation, the sensor control unit 240 immediately transmits an irradiation detection start signal to the imaging control apparatus 300 (S236). When receiving the irradiation detection start signal (S336), the imaging control apparatus 300 displays on the terminal side display unit 370 that X-ray irradiation is possible. The operator confirms this irradiation possible display and presses the irradiation button 140 (S120) to perform X-ray irradiation (S130). The irradiation possible display may be performed not only on the terminal side display unit 370 provided in the imaging control device 300 but also on the notification unit 600 independent of the imaging control device 300. The notification unit 600 is connected to the radiation imaging apparatus 200 and the imaging control apparatus 300 by wired or wireless connection, and the irradiation button 140 needs to be pressed at a position where the terminal side display unit 370 and the display unit 270 are not visible. It is possible to appropriately know whether or not irradiation can be performed.

  When X-rays are irradiated, X-ray irradiation detection is performed using the radiation detection circuit 221 (S237), and the sensor control unit 240 that receives a signal from the radiation detection circuit 221 or the radiation detection circuit 221 receives the X-ray irradiation. If it is determined that X-ray irradiation has started, accumulation of charges generated by incident X-rays is immediately started, and then an accumulation start signal is immediately transmitted to the imaging control apparatus 300 (S242). When the imaging control device 300 receives the accumulation start signal, the terminal side display control unit 371 displays on the terminal side display unit 370 that the X-ray irradiation has been detected. The accumulation is performed over a time set by a predetermined set value (for example, 1 second). Alternatively, the accumulation time may be arbitrarily changed according to the X-ray irradiation conditions. Further, the end of irradiation is detected by the radiation detection circuit 221 or a dedicated sensor, and the accumulation time is adjusted in accordance with the signal.

  After the accumulation is completed (S260), image processing and data transmission processing are performed in the radiation imaging apparatus 200, and the captured image data is transmitted to the control through the communication circuit 295. The transmitted image data is stored after performing image processing or the like as necessary (S370). The display control unit 271 displays the captured image on the display unit 270. (S380). When shooting is continued, the setting is repeated from the setting of shooting conditions (S310) again. When the repeated imaging is not performed, the operations of the radiation generation apparatus 100, the radiation imaging apparatus 200, and the imaging control apparatus 300 are stopped.

(Acquisition of calibration correction data)
In the radiation imaging apparatus of this embodiment, it is necessary to perform calibration in order to correct the difference in detection sensitivity for each pixel. It is preferable to perform calibration before actual shooting. By measuring the exact output value of each pixel under a certain irradiation condition, the variation in the gain of each pixel is started, and the irradiation of the used tube is performed. Unevenness can also be corrected. However, for accurate calibration, it is necessary to measure the output data of each pixel with high accuracy.

  In the present embodiment, when acquiring correction data for calibration from a so-called white image obtained by irradiating the radiation sensor 210 with uniform radiation, a white image is shot in shooting mode 2 (manual synchronization mode). . Using the calibration correction data obtained from the white image obtained in the photographing mode 2, the sensitivity unevenness correction of the radiographic image obtained in the photographing mode 1 and the photographing mode 2, that is, so-called gain correction is performed. The main subject of gain correction may be the sensor control unit 240 of the radiation imaging apparatus 300 or the image processing circuit of the imaging control apparatus 300.

  The imaging mode 1 (auto-trigger mode) is a mode in which, as described above, the presence of X-rays is detected when X-rays are irradiated on the radiation imaging apparatus, and imaging is started using that as a trigger. In the present embodiment, a change in the current flowing through the detector when X-rays enter the radiation sensor 210 is monitored, and it is determined that X-ray irradiation has started when a predetermined threshold value is exceeded. . This method is preferable because there is no restriction on the area where irradiation detection is possible, and the detection sensitivity can be increased by effectively using the irradiated X-rays for detection. On the other hand, by using a part of the irradiated X-ray for detection, the accuracy of the pixel value may be reduced in a part of the image depending on the X-ray irradiation condition. The area where the accuracy may be lowered is not fixed depending on the X-ray irradiation timing and the driving timing of the radiation imaging apparatus, and may cause a correction error when used as calibration correction data. .

  On the other hand, in the imaging mode 2, it is possible to perform imaging while synchronizing the accumulation timing and the X-ray irradiation timing, and there is no region where the measurement accuracy of the pixel value is reduced. Therefore, acquisition of calibration correction data is performed in shooting mode 2 when the above-described detection method is used, so that appropriate correction is realized.

  As described above, in the manual synchronization mode, the waiting time from the user's instruction to the start of accumulation can be arbitrarily set, so that the user can take an image at a desired timing without exchanging the synchronization signal with the radiation generator. You can start. In addition, since it becomes easier for the user to grasp the time from the start point before the start of storage to the start of storage, it is less necessary to pay attention to know the timing of the start of storage, and X-ray irradiation is performed beyond the storage period. The possibility that it will be reduced can be reduced.

  In addition, by using this manual synchronization mode together with the auto trigger mode, it is possible to cope with many imaging conditions without exchanging synchronization signals with the radiation generator. In the case of general imaging conditions, the auto-trigger mode can be used to reduce the labor of the operator. On the other hand, for example, when the dose is very small or the X-ray irradiation time is extremely short, the manual synchronization mode is used. Thus, radiation imaging can be performed reliably. With the radiation imaging apparatus having the mode (2), even if the radiation generation apparatus does not have an interface circuit for inputting / outputting a synchronization signal, digital radiation imaging can be executed under a wide range of imaging conditions.

  Compared to the auto trigger mode, the manual synchronization mode does not require a detection circuit or a sensor scan, so that power consumption can be reduced.

  In addition, even when the radiation sensor 210 is operated in the above-described manual synchronization mode, the radiation detection sensor 221 is powered and operated. For example, when radiation imaging with a very low dose is performed, it may be possible to detect radiation irradiation itself without considering the timing, even if detection of the start of radiation irradiation cannot be performed at an appropriate timing. As a result, when the user accidentally presses the radiation irradiation switch 140 or when the radiation sensor 210 performs irradiation regardless of the imaging preparation state due to some trouble, the radiation detection circuit 221 has irradiated. For example, the display unit 270 and the notification unit 600 notify the detection result. Thereby, it can be easily grasped by the operator at an appropriate timing that there is a problem in photographing.

  In the above-described embodiment, the case of taking an X-ray image has been described. However, the same applies to the case of taking images using other types of radiation, such as α rays, β rays, γ rays, and other electromagnetic waves. The effects of the invention can be obtained.

  In the above-described embodiment, when a communication circuit such as the communication circuit 295 or the terminal-side communication circuit 395 transmits data, the counterpart device is transmitted by specifying an IP address, for example. However, the present invention is not limited to this. . For example, it may be transmitted by broadcast that does not specify only the other party. In this case, for example, the device of the communication partner is designated in advance for each photographing unit, and the IP address of the transmission source is included in the transmitted / received data. Of the data received by the receiving device, only the signal from the designated device may be selectively used for control.

  In the above-described embodiment, the display by the display unit 270 and the terminal-side display 370 and the notification by each unit of the notification unit 600 may be collectively referred to as notification.

  FIG. 14 shows a hardware configuration example of the radiation imaging apparatus 200 and the imaging control apparatus 300 according to the above-described embodiment. The configuration with the same reference numerals as in the above example is the same unit, and the description may be omitted.

  The sensor control unit 240 includes an FPGA 2401, a RAM 2402, an HDD 2403, an MPU 2404, and a ROM 2405. The FPGA 2401 mainly controls the drive circuit 220 and the readout circuit 230. The MPU 2404 is a circuit that controls the operation of the radiation imaging apparatus 200 in an integrated manner, and controls each part of the radiation imaging apparatus 200 by executing instructions included in programs stored in the ROM 2405 and the HDD 2403. Thereby, the processing according to the above-described embodiment is realized. A RAM 2402 is a work memory of the MPU 2404. The HDD 2403 stores various setting data, and also stores an OS 2431 and a program 2432 operating on the OS 2431. The program 2432 is a program for realizing the functions shown in the flowcharts of FIGS. 5, 9, 12, and 13 for the functions of the hardware shown in FIG. 13, and is executed by the MPU 2404, for example, FIG. The functions shown in FIGS. 3, 8, and 11 are realized.

  On the other hand, the imaging control apparatus 300 includes a GPU 3001, a RAM 3002, an HDD 3003, a CPU 3004, and a ROM 3005. The CPU 3004 is a circuit that integrally controls the hardware of the imaging control apparatus 300 and the units connected thereto, and executes the commands included in the programs stored in the ROM 3005 and the HDD 3003 so that each part of the imaging control apparatus 300 is executed. To control. A RAM 3002 is a work memory of the CPU 3004. In addition to storing various setting data, the HDD 3003 stores an OS 3031 and a program 3032 that operates on the OS 3031. The program 3032 is a program for realizing the functions shown in the flowchart of FIG. 9, FIG. 12, or FIG. 13 for each function of the hardware shown in FIG. 13, and is executed by the CPU 3004, for example, FIG. The function shown in FIG. 11 is realized. The GPU 3001 is a dedicated circuit mainly for executing image processing, and processes image data received in accordance with an instruction from the CPU 3004.

  When the functions implemented in the FPGA are realized by the MPU 2404 or the CPU 3004, a software program corresponding to the hardware description language used for the implementation of the FPGA is prepared and stored in the HDD 2403 or 3003 as the program 2432 or 3032. By executing instructions included in the stored program sequentially or in parallel by the MPU 2404 or the CPU 3004, the processing described in the flowcharts of FIGS. 5, 9, and 12 described above is realized. Conversely, when the functions implemented by the MPU or CPU and the program are implemented by hardware, a program written in a hardware description language corresponding to the program is generated, and FPGA configuration data is obtained therefrom. Implemented by.

  Note that embodiments in which the above-described embodiments are appropriately combined are also included in the embodiments of the present invention.

Claims (12)

A setting means for setting a waiting time until radiation imaging is started in response to an operation input from the operation unit;
Determining means for determining whether the waiting time has elapsed from the time based on the instruction to start timing of the waiting time after setting by the setting means;
Control means for causing the radiation sensor to transition to a state where charge can be accumulated in response to the determination of the passage of the waiting time;
Display control means for displaying on the display unit a display indicating that it is a period during which radiation should not be irradiated before the elapse of the waiting time is determined,
The control device, wherein the display control means displays a display indicating that radiation can be emitted in response to the determination that the standby time has elapsed. A setting means for setting a waiting time until radiation imaging is started in response to an operation input from the operation unit;
Determining means for determining whether the waiting time has elapsed from the time based on the instruction to start timing of the waiting time after setting by the setting means;
Control means for causing the radiation sensor to transition to a state where charge can be accumulated in response to the determination of the passage of the waiting time;
Display control means for displaying on the display unit a display indicating that it is a period during which radiation should not be irradiated before the elapse of the waiting time is determined,
The display control means is a display for displaying on the display unit a display indicating the remaining time of the standby time as a display indicating that it is a period during which radiation irradiation should not be performed before the elapse of the standby time is determined. Control means;
A control device characterized by. A setting means for setting a waiting time until radiation imaging is started in response to an operation input from the operation unit;
Determining means for determining whether the waiting time has elapsed from the time based on the instruction to start timing of the waiting time after setting by the setting means;
Control means for causing the radiation sensor to transition to a state where charge can be accumulated in response to the determination of the passage of the waiting time;
Display control means for displaying on the display unit a display indicating that it is a period during which radiation should not be irradiated before the elapse of the waiting time is determined,
The display control means displays a display indicating that the first switch of the radiation irradiation switch should be pressed before the elapse of the waiting time is determined.   The said setting means sets the display period of the display which shows that the irradiation of the said radiation is possible based on the operation input from the said operation part, and the accumulation | storage time of the said radiation sensor. 4. The control device according to any one of 3.   4. The control device according to claim 1, wherein the control unit executes an initialization process for initializing the radiation sensor before it is determined that the standby time has elapsed. 5. .   2. The control unit according to claim 1, wherein a signal for causing the radiation sensor to transition to a state in which charge can be accumulated is transmitted by a communication circuit in response to the determination that the standby time has elapsed. 4. The control device according to any one of items 1 to 3.   The display control means does not display a display indicating that radiation irradiation is possible when there is an abnormality in transmission of a signal for transitioning to a state where the charge can be accumulated. The control device according to any one of claims 1 to 3.   In response to an instruction to start timing of the standby time, the control means transmits a reservation signal including the standby time and an instruction to make a transition to a state where charge can be accumulated after the standby time has elapsed by using a communication circuit. The control device according to any one of claims 1 to 3, wherein:   2. The control unit according to claim 1, wherein the control unit causes the radiation sensor to transition to a state in which charge can be accumulated in response to reception of a signal requesting permission for radiation irradiation from an interface with the radiation generation apparatus. 4. The control device according to any one of items 1 to 3.   In response to the first control for causing the radiation sensor to transition to a state in which charge can be accumulated in response to the determination of the passage of the standby time, and to the radiation sensor in accordance with a signal from the detection means for detecting the start of radiation irradiation. The second control for making a transition to a state where charge can be accumulated, and the control means accumulates charges in the radiation sensor in response to receiving a signal requesting permission for radiation irradiation from the interface with the radiation generator. The control device according to any one of claims 1 to 3, further comprising selection means for selecting which of the third control to change to a possible state is executed.   Memory that associates and stores information indicating which of the first, second, and third controls has been performed with the radiation image data obtained according to any of the first, second, and third controls. The control device according to claim 10, further comprising:   A portable radiation imaging apparatus comprising: the control device according to claim 1; the radiation sensor; and a housing that houses the control device and the radiation sensor.

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