JP6848407B2 - Radiation imaging system - Google Patents

Description

The present invention relates to a radiation imaging system, and relates to a radiation imaging system capable of irradiating a patient who is a subject with radiation a plurality of times to perform moving image imaging.

A plurality of radiation detection elements are arranged in a two-dimensional shape (matrix shape), and the radiation transmitted through the subject is converted into image data according to the intensity of each radiation detection element (that is, for each pixel) and detected. Imaging devices (also referred to as flat panel detectors, semiconductor image sensors, etc.) have been developed as devices for radiographic imaging in place of conventional films / screens, brilliant phosphor plates, and the like.

With conventional films / screens and brilliant phosphor plates, if they are irradiated with radiation multiple times, problems of double exposure and multiple exposure will occur, but with a radiation image capturing device, the detected image data is captured for each capture. It can be saved in the memory in the device. In this way, since the radiation image capturing device does not cause problems of double exposure and multiple exposure, the radiation imaging device is used to irradiate the inspection target part (that is, the shooting part) of the subject with radiation multiple times to shoot a moving image. It can be performed.

Examples of the moving image imaging include dynamic imaging in which the chest of the patient, which is the subject of the examination, is irradiated with radiation a plurality of times and each frame image is captured. In the dynamic imaging, for example, as shown in FIG. 13, _{each frame image in each time phase T (T = t 0 to t 6} ) of the lung field R of the patient can be obtained, and by analyzing these, the lung field can be obtained. The maximum inspiratory position, maximum expiratory position, expiratory period, inspiratory period, etc. of R can be determined. In addition, attempts have been made to apply it to diagnosis by further analyzing each frame image obtained by moving image shooting such as dynamic shooting.

On the other hand, when the above-mentioned moving image is taken using the radiation imaging device, the radiation imaging device and the radiation irradiation device that irradiates the radiation imaging device must be synchronized with each other. For example, while the image data is being read out by the radiation imaging device, the radiation irradiation device is irradiated with radiation from the radiation irradiation device, and it is not possible to output appropriate image data in the next image data reading process. Problem arises.

Therefore, for example, in Patent Document 1, in a radiation imaging system that wirelessly communicates between a radiation imaging device and a radiation irradiation device, the imaging timing (charge accumulation or image data described later) in the radiation imaging device is performed. A method of strictly controlling the irradiation timing (timing of irradiating radiation) and the irradiation timing (timing of irradiating radiation) on the radiation irradiating device side is disclosed. Such management is also important in a radiation imaging system that performs imaging by performing wired communication between the radiation imaging device and the radiation irradiation device.

Japanese Unexamined Patent Publication No. 2009-186439

By the way, as a method of synchronizing between the radiation imaging device and the radiation irradiation device, that is, matching the imaging timing in the radiation imaging device and the irradiation timing in the radiation irradiation device, as described above, the radiation imaging device and the radiation irradiation There is also a method of directly exchanging signals with the device. For example, the control unit transmits a pulse-shaped synchronization signal informing the radiation imaging device and the radiation irradiation device of the imaging timing and the irradiation timing, respectively, for synchronization. There is also a method.

At that time, in the radiation imaging apparatus, the reset process of the radiation detection element for removing the dark current (also referred to as dark charge or the like) accumulated in the radiation detection element is usually repeated before imaging. If radiation is applied during the reset of the radiation detection element, the useful charge generated in the radiation detection element due to the irradiation of the radiation is lost in the reset process.

Therefore, in the case of the above configuration, when the irradiation switch of the radiation irradiation device is operated by a photographer such as a radiological technologist (at that time, radiation is not yet irradiated), the radiation image capturing device is operated by the control unit. A signal indicating that radiation is to be irradiated to the subject (hereinafter referred to as an irradiation start signal) is transmitted. Then, on the other hand, the radiation imaging apparatus has completed the reset processing of the radiation detection element performed at that time, and is in a state where each radiation detection element can accumulate a charge inside the device (hereinafter referred to as a charge accumulation state). A signal (hereinafter referred to as an unlock signal) that allows irradiation of radiation at a time point is transmitted. Then, the control unit that has received the unlock signal starts transmitting a synchronization signal (hereinafter referred to as an irradiation synchronization signal) notifying the irradiation timing to the radiation irradiation device, so that the radiation irradiation device is transferred to the radiation imaging device. It can be configured to initiate irradiation of radiation.

Further, the radiographic image capturing apparatus is configured to perform image data reading processing each time after transmitting an unlock signal, each time a synchronization signal (hereinafter referred to as a reading synchronization signal) notifying the imaging timing from the control unit is received. It is possible to do. Then, each time the radiographic image capturing device reads out the image data, the image data (or a part of the image data) is transferred to the image display device, and the image data is image-processed by the image display device to form a frame image. (Or a preview image of the frame image) can be configured to be displayed.

However, with such a configuration, for example, the line for transmitting the unlock signal from the radiation imaging device to the control unit is congested, and the transmission of the unlock signal from the radiation imaging device to the control unit is delayed. And, for example, the following problems may occur.

That is, as described above, the radiographic imaging apparatus transmits the unlock signal, then performs the reading processing of the image data according to the synchronization signal for reading from the control unit, and transfers the read image data to the image display device. However, since the unlock signal from the radiation imaging device has not arrived at the control unit during the delay as described above, the control unit does not transmit the irradiation synchronization signal to the radiation irradiation device. Therefore, during that time, no radiation is emitted from the radiation irradiation device.

Therefore, if the transmission of the unlock signal from the radiation imaging device to the control unit is delayed as described above, the image is imaged by the radiation imaging device even though the radiation imaging device is not irradiated with radiation during that time. Since the data is read, the subject is not photographed in the read image data. Therefore, such image data is transferred to the image display device, and even if a frame image based on the image data is displayed on the image display device, only an image in which the subject is not captured is displayed.

In such a state, the photographer may feel uncomfortable. In addition, the photographer who saw the frame images for several frames in which the subject was not photographed mistakenly thought that the image had failed and re-photographed (re-shooting), resulting in unnecessary exposure dose of the subject. It may increase.

The present invention has been made in view of the above points, and even if there is a delay in the transmission of the unlock signal from the radiographic image capturing device to the control unit, the image display device displays an image in which the subject is not captured. It is an object of the present invention to provide a radiographic imaging system capable of accurately preventing the occurrence.

In order to solve the above problems, the radiographic imaging system of the present invention can be used.
Radiographic imaging equipment to read out image data from a plurality of radiation detecting elements arranged two-dimensionally
In a radiation image capturing system that captures a moving image of a radiation image that has been irradiated to a subject multiple times by a radiation irradiation device.
A control unit for transmitting a reading synchronization signal to the radiation imaging device and transmitting an irradiation synchronization signal to the radiation irradiation device to perform synchronization control between the radiation imaging device and the radiation irradiation device is provided.
The radiation imaging device receives the reading synchronization signal to which additional information is added from the control unit, and then extracts the image data or image data for preview from the image data at a predetermined ratio on the image display device. It is characterized by transferring.

Further, the radiographic imaging system of the present invention is
A radiation imaging device that reads and transfers image data from multiple radiation detection elements arranged in two dimensions, and a radiation imaging device .
And an image display device capable of displaying a frame image generated based on the image data transferred from the previous SL radiographic apparatus,
In a radiation image capturing system that captures a moving image of a radiation image that has been irradiated to a subject multiple times by a radiation irradiation device.
Control that transmits a reading synchronization signal to the radiation imaging device and the image display device, transmits an irradiation synchronization signal to the radiation irradiation device, and performs synchronization control between the radiation imaging device and the radiation irradiation device. Equipped with a unit
The image display device is characterized by displaying the frame image or the frame image for preview generated based on the image data received after receiving the read synchronization signal to which additional information is added from the control unit. And.

According to the radiation imaging system of the method as in the present invention, even if the transmission of the unlock signal from the radiation imaging device to the control unit is delayed, the image display device displays an image in which the subject is not captured. It is possible to prevent this from happening accurately.

It is a block diagram which shows the equivalent circuit of a radiation imaging apparatus. It is a timing chart which shows the timing which applies the on-voltage to each scanning line at the time of transitioning to a charge accumulation state and reading process of image data by a radiation imaging apparatus. It is a figure explaining an example of the method of extracting the image data for preview. It is a figure which shows the structure of the radiation imaging system which concerns on this embodiment. It is a figure explaining that the radiation is irradiated while the radiation imaging apparatus is in a charge accumulation state. It is a timing chart explaining the timing of transmission / reception of signals, data, etc. between an image display device, a radiation imaging device, a control unit, and a radiation irradiation device. Conventionally, it is a timing chart for explaining that when the transmission of the unlock signal from the radiation imaging apparatus is delayed, the image data in which the subject is not photographed is transferred to the image display apparatus. It is a figure explaining that the pulse width of the synchronization signal for reading which is transmitted to a radiation image taking apparatus is changed significantly. It is a timing chart explaining that image data in which a subject is not photographed is not transferred to an image display device even if the transmission of an unlock signal from a radiation image capturing apparatus is delayed. 6 is a timing chart for explaining the timing of transmission / reception of signals, data, etc. between the image display device, the radiation imaging device, the control unit, and the radiation irradiation device in the first modification. It is a figure explaining that the synchronization signal for reading which is transmitted to a radiographic image taking apparatus is accompanied by an additional signal, and is transmitted. It is a figure explaining that in tomosynthesis photography, a plurality of images are taken while changing the position of a radiation irradiation apparatus, the position of a radiation image acquisition apparatus, etc. with respect to a subject. It is a figure which shows the example of each frame image taken by the dynamic photography of a patient's chest.

Hereinafter, embodiments of the radiation imaging system according to the present invention will be described with reference to the drawings.

[About radiation imaging equipment]
First, the configuration of the radiographic imaging apparatus used in the radiographic imaging system according to the present embodiment will be briefly described. In the following, a case where the radiation imaging device 1 is configured to be portable will be described as shown in FIG. 4, which will be described later. For example, the radiation imaging device 1 and the cassette holder of the photographing table (FIG. 4). It is also possible to configure it as a dedicated machine-type radiographic image capturing apparatus integrally formed with (see 41).

FIG. 1 is a block diagram showing an equivalent circuit of a radiographic imaging apparatus. As shown in FIG. 1, in the radiation imaging apparatus 1, a plurality of radiation detection elements 7 are arranged in a two-dimensional shape (matrix shape) and in a rectangular shape on a sensor substrate (not shown). Hereinafter, the radiation detection element 7 may be referred to as a pixel. Then, each radiation detecting element 7 is adapted to generate an electric charge according to the dose when the radiation transmitted through a subject (not shown) is irradiated. Further, a reverse bias voltage is applied to each radiation detection element 7 from the bias power supply 14 via the bias wire 9 and the connection 10.

Further, in the scanning drive means 15, the on voltage and the off voltage supplied from the power supply circuit 15a via the wiring 15c are switched by the gate driver 15b and applied to the respective lines L1 to Lx of the scanning line 5. There is. A TFT (Thin Film Transistor) 8 is connected to each radiation detection element 7 as a switch element, and the TFT 8 is turned off when an off voltage is applied via the scanning line 5, and the radiation detection element 7 is turned off. The conduction between the signal line 6 and the signal line 6 is cut off, and the charge generated in the radiation detection element 7 is accumulated in the radiation detection element 7. Further, the TFT 8 is turned on when an on-voltage is applied via the scanning line 5, and the electric charge accumulated in the radiation detection element 7 is discharged to the signal line 6.

A plurality of read-out circuits 17 are provided in the read-out IC 16, and each signal line 6 is connected to the read-out circuit 17. Then, during the reading process of the image data D from each radiation detection element 7, when each TFT 8 connected to the scanning line 5 to which the on voltage is applied from the gate driver 15b is turned on, the radiation detection element 7 charges. Is emitted to the signal line 6 via the TFT 8 and flows into the read circuit 17. Then, the amplifier circuit 18 of the read circuit 17 outputs a voltage value according to the amount of the electric charge that has flowed in.

Then, the correlated double sampling circuit (described as “CDS” in FIG. 1) 19 reads out the voltage value output from the amplification circuit 18 as analog value image data D, outputs it to the downstream side, and outputs it. The generated image data D is sequentially transmitted to the A / D converter 20 via the analog multiplexer 21, is sequentially converted into digital value image data D by the A / D converter 20, and is sequentially stored in the storage means 23. .. Then, by sequentially applying an on-voltage from the gate driver 15b to each of the lines L1 to Lx of the scanning line 5, the image data D is read out from each radiation detection element 7.

The control means 22 is a computer (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), a computer in which an input / output interface or the like is connected to a bus, an FPGA (Field Programmable Gate Array), or the like (not shown). It is configured. It may be composed of a dedicated control circuit.

A storage means 23 composed of an SRAM (Static RAM), an SDRAM (Synchronous DRAM), a NAND flash memory, or the like is connected to the control means 22, and a wireless system is used with the outside via an antenna 29 or a connector 27. And a communication unit 30 that communicates by a wired method is connected. Further, the scanning driving means 15, the reading circuit 17, the storage means 23, the bias power supply 14, and the like described above are connected to the control means 22. Although FIG. 1 shows a case where the radiation imaging apparatus 1 has a built-in power supply 24, it can be configured to receive electric power from the outside.

[Processing in radiographic imaging equipment]
When the radiation image capturing apparatus 1 is used for moving image imaging as in the present embodiment, the radiation image capturing apparatus 1 alternately performs the above-mentioned transition to the charge accumulation state and the reading process of the image data D.

Specifically, as shown in FIG. 2, the radiation imaging apparatus 1 applies an off voltage from the gate driver 15b of the scanning driving means 15 to each line L1 to Lx of the scanning line 5 to turn off all TFTs 8. Then, the radiation detection element 7 is shifted to the charge accumulation state in which the charge is accumulated, and the charge accumulation state is continued for a predetermined time (so-called accumulation time). Then, after that, an on-voltage is sequentially applied from the gate driver 15b to each of the lines L1 to Lx of the scanning line 5, each TFT 8 is sequentially turned on, and the image data D is read out from each radiation detection element 7 as described above. The processing is performed to read out the image data D for one frame.

Then, the radiation imaging apparatus 1 turns off all the TFTs 8 again to shift to the charge accumulation state. In this way, the radiation imaging apparatus 1 is adapted to perform these processes alternately and repeatedly. The radiation imaging apparatus 1 performs the above operation based on the synchronization signal S1 for reading from the control unit 70, which will be described later, and this point will be described later.

Further, in the present embodiment, when the radiographic image capturing apparatus 1 is irradiated with radiation and an image is taken, the image data D is read out from each radiation detecting element 7 as described above and sequentially sent to the storage means 23. While saving, as shown in FIG. 3, the image data D is extracted from the read image data D at a predetermined ratio (in the case of FIG. 3, one in four scanning lines) (hereinafter, for preview). The image data D for previewing is transferred to the image display device 60 described later.

In the following, a case where the image data D for preview is transferred from the radiation image capturing device 1 to the image display device 60 (then, the remaining image data D (or all image data D) and the like are transferred) will be described. However, it is also possible to configure so that all the image data D read out each time the image data D is read out (RO) is transferred from the radiographic image capturing device 1 to the image display device 60. In this case, the image display device 60 displays a frame image instead of the preview frame image described later.

Further, D (n, m) in FIG. 3 represents image data D read from the radiation detection element 7 connected to the nth scanning line 5 and the mth signal line 6. Further, the method of extracting the image data D for preview is not limited to the case shown in FIG. 3, and may be configured to extract one image data D from, for example, 3 × 3 pixels or 4 × 4 pixels.

[Radiation imaging system]
Next, the radiation imaging system 100 according to the present embodiment will be described. In the following, the case where the moving image shooting such as dynamic shooting is performed in the standing position will be described, but the case where the moving image shooting is performed in the lying position is also described in the same manner. It also applies when it is reported. As shown in FIG. 4, the radiation imaging system 100 includes a radiation imaging device 1, a radiation irradiation device 50, an image display device 60, and a control unit 70.

The radiation imaging apparatus 1 is loaded in the cassette holder 41 of the photographing table 40, and the cassette holder 41 can be vertically aligned along the support column 42 to perform vertical alignment. There is. As described above, the radiation imaging apparatus 1 and the cassette holder 41 may be integrally formed.

The radiation irradiation device 50 emits radiation from a radiation source 51 composed of a rotating anode or the like (not shown), a collimator 52 that performs processing such as narrowing the irradiation field with respect to the radiation X emitted from the radiation source 51, and radiation from the radiation source 51. It is provided with a generator 53 or the like for irradiating the source X or adjusting the dose of the radiation X. Then, when the tube voltage, tube current, irradiation time (or mAs value), etc. are set, the generator 53 irradiates the radiation X with a dose (that is, dose rate and irradiation time) corresponding to them from the radiation source 51, etc. Therefore, the irradiation of radiation X from the radiation source 51 is controlled.

The radiation irradiation device 50 irradiates the radiation X from the radiation source 51 based on the irradiation synchronization signal Sx from the control unit 70, which will be described later. This point will be described later. .. Further, it is also possible to configure the generator 53 to be set by operating the tube voltage or the like on another computer such as the image display device 60 described later.

The image display device 60 is composed of a computer including a display unit 61 composed of a CRT (Cathode Ray Tube), an LCD (Liquid Crystal Display), or the like, but it can also be configured as a dedicated device. Then, as described above, when the image data D for preview is transferred from the radiation image capturing device 1 from which the image data D is read, the image display device 60 is used for previewing based on the image data D for preview. A frame image is generated and displayed on the display unit 61.

In the present embodiment, in addition, on the image display device 60, the tube voltage and the like are set in the generator 53 of the radiation irradiation device 50 as described above, and the shooting conditions for performing moving image shooting are input (or the shooting conditions and the like). Various information such as imaging order information in which is set can be ordered from an external system such as RIS (Radiology Information System) which is not shown. Further, in the present embodiment, the image display device 60 transmits a shooting request to the radiation image shooting device 1 and the control unit 70 at the start of shooting a moving image to start the moving image shooting, or the radiation image shooting device for shooting. When the preparation of 1 is completed, it is possible to manage moving image shooting, such as displaying on the display unit 61 that shooting is possible.

Although the control unit 70 is configured as a dedicated device in the present embodiment, it can also be configured by a computer or the like. Then, in the present embodiment, each time the control unit 70 transmits the pulse-shaped reading synchronization signal S1 to the radiographic image capturing device 1, the radiographic imaging device 1 reads out the image data D as shown in FIG. After performing the above, the state shifts to the charge accumulation state. Further, each time the control unit 70 transmits a pulsed irradiation synchronization signal Sx to the generator 53 of the radiation irradiation device 50, the generator 53 irradiates the radiation X from the radiation source 51 of the radiation irradiation device 50. Upon receiving the irradiation synchronization signal Sx, the generator 53 irradiates the radiation X from the radiation irradiating device 50.

Then, as shown in FIG. 5, the image data D is read out so that the radiation X is irradiated from the radiation source 51 while the radiation imaging device 1 is in the charge accumulation state (that is, the radiation imaging device 1 performs the reading process of the image data D). (To prevent the radiation X from being irradiated from the radiation source 51 during the irradiation) The timing of transmitting the reading synchronization signal S1 from the control unit 70 to the radiation imaging device 1 and the irradiation of the generator 53 of the radiation irradiation device 50. The timing of transmitting the synchronization signal Sx for use is appropriately adjusted. In FIG. 5, the period during which the radiation X is irradiated is shown with diagonal lines.

In the present embodiment, in this way, the timing of transmitting the read synchronization signal S1 and the irradiation synchronization signal Sx from the control unit 70 to the generator 53 of the radiation imaging device 1 and the radiation irradiation device 50 is appropriately adjusted. , The radiation image capturing device 1 and the radiation irradiating device 50 are synchronously controlled to shoot a moving image.

In the present embodiment, the control unit 70 is installed as a retrofit in the place where the radiation imaging device 1, the image display device 60, the radiation irradiation device 50 including the generator 53, and the like are installed in a facility such as a hospital. There is. Therefore, the line (see A in FIG. 4) for transmitting the read synchronization signal S1 from the control unit 70 to the radiation imaging device 1 and the irradiation synchronization signal Sx to the generator 53 of the radiation irradiation device 50 is a dedicated line. Although it is configured by newly arranging it, the existing wiring in the facility is used for the line (see B in FIG. 4) between the radiation imaging device 1 and the image display device 60. Note that FIG. 4 shows a case where the control unit 70 is arranged on the line B between the radiographic image capturing device 1 and the image display device 60, but in addition to this, the radiographic image capturing device 1 and the image display device 60 are connected. A line for direct connection may be provided.

[Specific processing in the radiographic imaging system]
Hereinafter, specific processing in the radiation imaging system 100 according to the present embodiment will be described.

In the present embodiment, a photographer such as a radiologist operates the generator 53 of the radiation irradiation device 50, transmits setting information from the image display device 60 to the generator 53, and the like, thereby transmitting a tube voltage and a tube to the generator 53. Set the current, irradiation time (or mAs value), etc. Then, when the photographer inputs the shooting conditions to the image display device 60 and obtains various information such as shooting order information to complete the shooting preparation and operates the image display device 60, as shown in FIG. The image display device 60 transmits an imaging request to the radiation imaging apparatus 1 and the control unit 70.

Upon receiving the imaging request, the control unit 70 starts transmitting the reading synchronization signal S1 to the radiographic imaging apparatus 1, and has a predetermined pulse width τ in a predetermined period T (see FIG. 6 and FIG. 8 described later). The synchronization signal S1 for reading is transmitted to the radiation imaging apparatus 1. Then, each time the radiographic image capturing apparatus 1 receives the reading synchronization signal S1, it performs reading processing of the image data D and transition to the charge accumulation state (see FIG. 2).

In FIG. 6, the reading process of the image data D is represented as “RO”, and the charge accumulation state is represented as “I”. Further, in each of the figures below FIG. 6, the image data D is read out (RO) by the radiation imaging apparatus 1 in synchronization with the falling edge of the pulsed reading synchronization signal S1 (or the reading synchronization signal S1 ^{* described later).} ) Is started, but even if the radiation image capturing apparatus 1 is configured to start the reading process (RO) of the image data D in synchronization with the rise of the reading synchronization signal S1 or the like. Good.

Further, in this case, since the radiation X is not emitted from the radiation irradiation device 50, the subject is not photographed in the image data D read out by the radiation image capturing device 1. However, the image data D read out in this way without being irradiated with the radiation X can be used as the offset data O due to the dark current. The offset data O is a true result of the useful charge generated in the radiation detection element 7 by the irradiation of the radiation X by subtracting the offset data O from the image data D read by the reading process of the image data D. It is used for image correction to calculate image data.

In the radiation detection element 7, a dark current (also referred to as a dark charge or the like) is constantly generated by thermal excitation caused by the heat (temperature) of the radiation detection element 7 itself, and the image data D to be read is offset by the dark current. Minutes are superimposed. Then, as described above, the image data D, that is, the offset data O, which is read out in a state where the radiation X of the radiation imaging apparatus 1 is not irradiated, is the offset amount itself due to this dark current.

Therefore, the image data D read out in the state where the radiation X is not irradiated as described above can be used as the offset data O due to the dark current. At that time, if the duration of the charge accumulation state is different, the amount of dark current accumulated in the radiation detection element 7, that is, the offset amount due to the dark current and the value of offset data O are different. Even if the value of the offset data O differs depending on the duration of the charge accumulation state, it is possible to convert the offset data O based on the duration of the charge accumulation state.

However, the duration of the charge accumulation state is the charge accumulation state at the time of the reading process of the image data D after shooting (that is, the reading process of the image data D when the radiation image capturing device 1 is actually irradiated with the radiation X). If the duration is the same as the duration of, the read offset data O can be directly subtracted from the image data D and used for image correction of the image data D without performing the above conversion.

Therefore, in the present embodiment, in order to read the offset data O under the same conditions as when reading the image data D (that is, under the condition that the duration of the charge accumulation state is the same before and after the start of shooting). As shown in FIG. 6, when the control unit 70 transmits the read synchronization signal S1 to the radiation image capturing device 1 before imaging, the control unit 70 transmits the irradiation synchronization signal Sx to the radiation irradiation apparatus 50 after the start of imaging (that is, transmission of the irradiation synchronization signal Sx to the radiation irradiation device 50). The reading synchronization signal S1 is transmitted to the radiographic imaging apparatus 1 at the same period T as the period T for transmitting the reading synchronization signal S1 to the radiographic imaging apparatus 1).

Then, the radiation image capturing apparatus 1 performs a reading process of offset data O by a dark current in a state where no radiation is applied based on the reading synchronization signal S1 transmitted from the control unit 70, and reads the read offset data O. It is designed to be transferred to the image display device 60. The image display device 60 is configured to store the transferred offset data O in a storage means (not shown) and use it for image correction of the image data D to be transferred later.

With this configuration, the radiation image capturing device 1 can automatically and accurately read the offset data O due to the dark current used for image correction of the image data D in a series of operations for performing moving image shooting. Become. Further, since the radiation imaging apparatus 1 automatically and accurately reads the offset data O due to the dark current in this way, it is not necessary for a photographer such as a radiologist to perform an operation or process for reading the offset data O. Therefore, the radiation image capturing system 100 is easy to use for the photographer.

Note that FIG. 6 shows a case where the offset data O reading process is performed for only one frame. For example, the radiation image capturing device 1 performs the offset data O reading process for a plurality of frames, and the image display device 60 performs the reading process for a plurality of frames. It is also possible to configure the offset data O by calculating the average value of the offset data O for a plurality of frames for each pixel. Further, the reading process (RO) of the image data D and the electric charge until the operation such as the reading process of the image data D in the radiation imaging apparatus 1 is stable and the electric charge remaining in each radiation detecting element 7 is appropriately removed. It is preferable that the offset data O is read out after the transition to the storage state (I) is repeated a predetermined number of times.

After that, the control unit 70 continues to send the reading synchronization signal S1 to the radiation imaging device 1 even if the offset data O is read out by the radiation imaging device 1. Then, the radiation imaging apparatus 1 repeats the reading process (RO) of the image data D and the transition to the charge accumulation state (I) every time the reading synchronization signal S1 is transmitted. The reading process of the image data D before the imaging (that is, before the radiation X is irradiated from the radiation irradiation device 50) is a reset of the radiation detection element 7 for removing the charge from each of the radiation detection elements 7 described above. Also serves as processing.

Then, when the process of reading the offset data O is completed and the image is ready for imaging, an enable signal Sen indicating that imaging is possible is transmitted from the radiation image capturing device 1 to the image display device 60 and the control unit 70. .. When the image display device 60 receives the enable signal Sen, the image display device 60 displays on the display unit 61 that shooting is possible.

Subsequently, when the photographer operates an irradiation switch (also referred to as an exposure switch or the like) of the radiation image irradiation device 50 (also referred to as an exposure switch) in order to start video recording, the generator of the radiation irradiation device 50 is as shown in FIG. The irradiation start signal Ss is transmitted from 53 to the control unit 70. As described above, the radiation irradiation device 50 does not immediately irradiate the radiation X even if the irradiation switch is operated. It is also possible to configure the irradiation start signal Ss to be transmitted to the image display device 60 or the like.

When the control unit 70 receives the irradiation start signal Ss, it transmits it to the radiation imaging apparatus 1. When the radiation imaging apparatus 1 receives the irradiation start signal Ss, it transmits an unlock signal Sul to the control unit 70 when the reading process (RO) of the image data D performed at that time is completed.

When the control unit 70 receives the unlock signal Sul, the radiation imaging apparatus 1 enters the charge accumulation state (see the charge accumulation state I indicated by α in FIG. 6) immediately after the reading process (RO) of the image data D. Radiation X may be irradiated from the radiation irradiation device 50 at the time of transition, but if the processing by the control unit 70 or the radiation irradiation device 50 is delayed even a little, the irradiation of the radiation X is continuing in the charge accumulation state (I). There is a possibility that the subsequent reading process (RO) of the image data D will be performed instead of ending with.

Therefore, in the present embodiment, in order to ensure safety, when the control unit 70 receives the unlock signal Sul, the radiation imaging apparatus 1 shifts to the charge accumulation state (I) and the next image data D is displayed. The irradiation synchronization signal Sx is transmitted to the generator 53 of the radiation irradiation device 50 at the timing when the read-out process (RO) is completed and the process shifts to the next charge storage state (see charge storage state I shown by β in FIG. 6). It is supposed to start.

Then, the radiographic image capturing apparatus 1 starts from the reading process (RO after β in FIG. 6) immediately after the reading process (RO after α in FIG. 6) immediately after transmitting the unlock signal Sul to the control unit 70. , The read image data D (in the present embodiment, the image data D for preview extracted from the image data D described later) is started to be transferred to the image display device 60.

It is also possible to configure the radiation irradiation device 50 to start transmitting the irradiation synchronization signal Sx to the generator 53 at the timing of transition to the charge accumulation state (I) shown by α in FIG. At that time, the radiographic image capturing apparatus 1 reads the image data D (the image described later in the present embodiment) from the reading process (RO after α in FIG. 6) immediately after transmitting the unlock signal Sul to the control unit 70. It is configured to start the transfer of the preview image data D) extracted from the data D to the image display device 60.

When the control unit 70 transmits the irradiation synchronization signal Sx to the generator 53 of the radiation irradiation device 50, the control unit 70 transmits the irradiation synchronization signal Sx at the same period T as the period T for transmitting the reading synchronization signal S1 to the radiation imaging device 1. It is designed to be sent. Each time the gelenator 53 of the radiation irradiation device 50 receives the irradiation synchronization signal Sx from the control unit 70, the radiation source 51 of the radiation irradiation device 50 causes the radiation imaging device 1 to irradiate the radiation X through the subject (. (See FIG. 5).

Further, as described above, when the radiation imaging device 1 starts irradiating the radiation X from the radiation irradiation device 50, the image data D read by the image data D reading process (RO) as described above is used. While sequentially storing in the storage means 23, the image data D for preview is extracted from the read image data D at a predetermined ratio, and the extracted image data D for preview is transferred to the image display device 60 (FIG. 5). And FIG. 6). Then, when the image data D for preview is transferred from the radiation image capturing device 1, the image display device 60 generates a frame image for preview based on the image data D for preview and displays it on the display unit 61. It is designed to be displayed.

At that time, the frame image for preview may be displayed in real time (that is, in the period T for each reading process of the image data D), or the photographer can surely confirm the frame image for preview. It is also possible to configure each frame image to be displayed at a cycle longer than the cycle T so as to be possible, and the method of displaying the frame image for preview is appropriately set. It is also possible to configure the photographer to switch the display method (cycle, etc.) of the frame image for preview.

In the radiation image capturing system 100 according to the present embodiment, moving image shooting is performed as described above.

[problem]
However, the above-mentioned configuration alone may cause problems similar to those in the conventional radiation imaging system described above. That is, as described above, in the present embodiment, the line for transmitting the read synchronization signal S1 and the irradiation synchronization signal Sx from the control unit 70 to the generator 53 of the radiation imaging device 1 and the radiation irradiation device 50 is configured as a dedicated line. However, the line between the radiation imaging device 1-control unit 70 is not a dedicated line but a line used in a conventional system (it can also be used for communication between other devices). ..

Therefore, for example, the radiation image capturing apparatus 1 that has received the irradiation start signal Ss as described above finishes the reading process (RO) of the image data D performed at that time and transmits the unlock signal Sul to the control unit 70. At that time, if the line is congested, a delay may occur. Further, there is a possibility that a delay may occur in the transmission of the irradiation start signal Ss from the control unit 70 to the radiation imaging apparatus 1.

Then, when the transmission of the unlock signal Sul from the radiation imaging device 1 to the control unit 70 is delayed, as shown in FIG. 7, the radiation imaging device 1 transmits the unlock signal Sul and then the control unit 70. It takes time for the unlock signal Sul to reach. Therefore, the irradiation synchronization signal from the control unit 70 to the generator 53 of the radiation irradiation device 50 is better in the case shown in FIG. 7 (when there is a delay) than in the case shown in FIG. 6 (when there is no delay). The time to start transmitting Sx is delayed.

On the other hand, as described above, when the radiographic image capturing device 1 transmits the unlock signal, as shown in FIGS. 6 and 7, the image data is synchronized with the reading synchronization signal S1 transmitted from the control unit 70. The reading process (RO) of D is performed, and the image data D for preview is extracted from the read image data D and transferred to the image display device 60. The transfer of the image data D for preview is started. Then, the image display device 60 generates a frame image for preview based on the transferred image data D for preview and displays it on the display unit 61.

However, in the case shown in FIG. 7, due to the above delay, the timing of starting the transmission of the irradiation synchronization signal Sx from the control unit 70 to the generator 53 of the radiation irradiation device 50 is delayed, and the radiation X from the radiation irradiation device 50 is transmitted. The start time of irradiation is delayed. Therefore, in the case of FIG. 7, the image data D for previewing three times after the transfer of the image data D for preview from the radiation image capturing device 1 to the image display device 60 is started is the radiation image capturing device 1. It is obtained in a state where the radiation X is not irradiated.

Therefore, the subject is not captured in the image data D for previewing three times, and the frame image for preview displayed on the display unit 61 of the image display device 60 is an image in which the subject is not captured. become. Therefore, as described above, the photographer such as a radiologist feels uncomfortable, or the photographer who sees the frame image for preview in which the subject is not photographed mistakenly thinks that the image has failed and re-shoots. As a result, there may be a problem that the exposure dose of the subject is unnecessarily increased.

[Configuration to solve the above problem]
In order to solve the above problem, in the radiation imaging system 100 according to the present embodiment, after the control unit 70 starts transmitting the irradiation synchronization signal Sx to the generator 53 of the radiation irradiation device 50, the radiation image Instead of transmitting the reading synchronization signal S1 to the photographing device 1, additional information is added to the reading synchronization signal S1 transmitted to the radiographic image capturing device 1 and transmitted.

Specifically, in the present embodiment, as shown in FIG. 8, the control unit 70 transmits the irradiation synchronization signal Sx to the generator 53 of the radiation irradiation device 50 before starting the transmission to the radiation imaging device 1. Compared to the pulse width τ of the reading synchronization signal S1 that has been performed, the reading synchronization signal S1 to be transmitted to the radiation imaging device 1 after starting the transmission of the irradiation synchronization signal Sx to the generator 53 of the radiation irradiation device 50. By significantly changing the pulse width τ ^* by changing the duty ratio, additional information is added to the read synchronization signal S1 and transmitted. Hereinafter, as shown in FIG. 8, the read synchronization signal to which additional information is added (that is, the pulse width τ has ^{changed to τ *} in the above case) is represented ^{as S1 *.}

That is, in the above case, the increase Δτ (= τ ^* −τ. A negative value (the pulse width may become smaller)) ^{of the pulse width τ of the read synchronization signals S1 and S1 * is additional information.} It turns out that. Note that "significantly changing" means that even if the pulse width τ of the read synchronization signal S1 fluctuates, ^{the difference between the pulse widths τ and τ *} before and after the change can be clearly recognized. To change.

Then, the radiation image capturing device 1 is adapted to transfer the preview image data D to the image display device 60 after the additional information is added from the control unit 70 and the read synchronization signal S1 ^{* is received.}

Therefore, even if the transmission of the unlock signal Sul from the radiographic image capturing device 1 to the control unit 70 is delayed as described above, the radiographic image capturing device 1 immediately reads the image data by the readout process (RO). The preview image data D extracted from D is not transferred to the image display device 60, and as shown in FIG. 9, the read synchronization signal S1 transmitted from the control unit 70 is for reading to which additional information is added. The transfer of the image data D for preview to the image display device 60 starts from the time when the synchronization signal S1 ^* changes (that is, the time when the pulse width τ ^{changes to τ * in the above case).}

As described above, in the present embodiment, even if the transmission of the unlock signal Sul from the radiation imaging device 1 to the control unit 70 is delayed, the radiation imaging device 1 is a read synchronization signal to which additional information is added. After accurately recognizing that the irradiation of radiation X from the irradiation apparatus 50 has started by receiving ^{S1 *} (that is, in the above case, the reading synchronization signal S1 ^{* in which the pulse width τ has changed to τ *).} Then, the transfer of the image data D for preview to the image display device 60 is started. Therefore, all the preview frame images generated and displayed by the image display device 60 based on the preview image data D transferred from the radiation image capturing device 1 are captured by the subject.

[effect]
As described above, according to the radiation image capturing system 100 according to the present embodiment, even if the transmission of the unlock signal Sul from the radiation imaging device 1 to the control unit 70 is delayed, the subject is displayed on the image display device 60. It is possible to accurately prevent an uncaptured image (a frame image for preview in the above example) from being displayed.

Therefore, since the subject is not captured in the image (frame image for preview) displayed on the image display device 60, the photographer feels uncomfortable or the image in which the subject is not captured (frame image for preview). It is possible to accurately prevent the problem that the photographer who sees the image mistakenly thinks that the image has failed and re-imposes the image, resulting in an unnecessarily increased exposure dose of the subject. ..

[Modification 1]
In the above embodiment, as shown in FIG. 9 and the like, the control unit 70 transmits the irradiation synchronization signal Sx to the generator 53 of the radiation irradiation device 50 after starting the transmission to the radiation imaging device 1. Additional information is added to the read synchronization signal S1 (that is, the pulse width τ is ^{significantly changed to τ *} ) and transmitted. Then, while the radiographic image capturing device 1 receives the reading synchronization signal S1 to which no additional information is added, the image display device 60 receives image data D for preview (or all image data D; the same applies hereinafter). Is not transferred, but the image data D for preview is transferred to the image display device 60 after receiving ^{the read synchronization signal S1 *} to which the additional information is added. However, instead of being configured in this way, it is also possible to configure it as follows.

That is, for example, as shown in FIG. 10, the control unit 70 is configured to transmit the reading synchronization signal S1 not only to the radiographic image capturing device 1 but also to the image display device 60. Note that FIG. 10 shows a case where the control unit 70 receives the irradiation start signal Ss from the generator 53 of the irradiation device 50 and then transmits the read synchronization signal S1 to the image display device 60. For example, It is also possible to configure the image display device 60 to transmit the read synchronization signal S1 from the time when the transmission of the read synchronization signal S1 to the radiation image capturing device 1 is first started.

In this case, even if the radiation image capturing device 1 receives the irradiation start signal Ss and starts transferring the preview image data D, the image display device 60 generates a preview frame image based on the irradiation start signal Ss. No display is performed.

Then, in the image display device 60, similarly to the above embodiment, after the control unit 70 starts transmitting the irradiation synchronization signal Sx to the generator 53 of the irradiation device 50, the radiation imaging device 1 and the image display device 60 ^{When the image data D for preview is received after receiving the sync signal S1 *} for reading transmitted by adding additional information to, a frame image for preview is generated and displayed based on the image data D for preview. It is also possible.

With this configuration, if there is a delay in the transmission of the unlock signal Sul from the radiation image capturing device 1 to the control unit 70, the image display device 60 previews that the subject has not been captured from the radiation image capturing device 1. Even if the image data D for reading is transferred, the synchronization signal for reading transmitted from the control unit 70 is the synchronization signal S1 for reading to which no additional information is added, so that a frame image for preview is generated and displayed. Do not do. Therefore, it is possible to accurately prevent a preview frame image in which the subject is not photographed from being displayed on the display unit 61 of the image display device 60.

Further, when the unlock signal Sul reaches the control unit 70 and the control unit 70 starts transmitting the irradiation synchronization signal Sx to the generator 53 of the irradiation device 50, the unlock signal Sx is transmitted from the control unit 70 to the image display device 60. The coming read synchronization signal changes to ^{the read synchronization signal S1 *} to which additional information is added. Then, since the irradiation of the radiation X is started, the image data D for preview transferred from the radiation image capturing device 1 to the image display device 60 is the one in which the subject is photographed.

^{Therefore, the image display device 60 receives the read synchronization signal S1 *} to which the additional information transmitted from the control unit 70 is added, and then the frame image for preview is transferred based on the image data D for preview. Is generated and displayed, the subject is always captured in the preview frame image displayed on the display unit 61.

Therefore, even if the configuration is as in the first modification, the image is displayed when the transmission of the unlock signal Sul from the radiation imaging device 1 to the control unit 70 is delayed, as in the case of the above embodiment. It is possible to accurately prevent the display device 60 from displaying an image in which the subject is not captured (a frame image for preview in the above example), and to accurately display the image in which the subject is captured. ..

Therefore, since the subject is not captured in the image (frame image for preview) displayed on the image display device 60, the photographer feels uncomfortable or the image in which the subject is not captured (frame image for preview). It is possible to accurately prevent the problem that the photographer who sees the image mistakenly thinks that the image has failed and re-imposes the image, resulting in an unnecessarily increased exposure dose of the subject. ..

[Modification 2]
On the other hand, in the above-described embodiment and the first modification, as a method of adding additional information to the read synchronization signal S1, a case where the pulse width τ of the signal is significantly changed by changing the duty ratio or the like has been described. However, instead of being configured in this way, or while changing the pulse width τ, the read synchronization signal S1 is transmitted with an additional signal attached before, after, or before or after the transmission of the read synchronization signal S1. By doing so, it is also possible to add additional information to the read synchronization signal S1 and transmit it.

In the following, the case where the pulse width τ of the read synchronization signal S1 itself is not changed will be described, but the pulse width τ of the read synchronization signal S1 itself is changed as shown in FIG. It can also be configured to allow.

In this case, the control unit 70 also starts transmitting the irradiation synchronization signal Sx to the generator 53 of the radiation irradiation device 50 as described above, and then the radiation imaging device 1 (also the image display device 60 as in the modification 1). When the read synchronization signal S1 is transmitted to the read synchronization signal S1 (including the case where the read synchronization signal S1 is transmitted. The same shall apply hereinafter), for example, as shown in FIG. 11, an additional signal Sa is attached after the transmission of the read synchronization signal S1. By transmitting, it is possible to configure so that additional information is added to the read synchronization signal S1 and transmitted.

In FIG. 11, the pulse width of the additional signal Sa is expressed to be very small, but when it is configured as such, the additional signal has a pulse width significantly larger than the noise so as to be distinguishable from noise, for example. The pulse width of Sa is set. Further, although not shown, the additional signal Sa is attached before and after the transmission of the read synchronization signal S1 instead of after the transmission, or the additional signal Sa is attached before and after the transmission of the read synchronization signal S1. It is also possible.

When an additional signal Sa is attached before or before or after the synchronization signal S1 for reading, for example, in order to prevent the radiation image capturing apparatus 1 from starting the reading process of the image data D in synchronization with the falling edge of the signal Sa, for example. The radiographic image capturing apparatus 1 is configured to perform reading processing of image data D in synchronization with the falling edge of a signal having a pulse width equal to or larger than a preset threshold value (that is, a reading synchronization signal S1 instead of an additional signal Sa). It is preferable to do so.

In the case of the configuration as in the modification 2, the radiation image capturing device 1 does not transfer the preview image data D to the image display device 60 in a state where only the read synchronization signal S1 is received from the control unit 70, and is added. It is configured to transfer the image data D for preview to the image display device 60 after receiving the read synchronization signal S1 accompanied by the signal Sa (in the case of the above embodiment).

Alternatively, in the state where the image display device 60 receives only the read synchronization signal S1 from the control unit 70, even if the image data D for preview is transferred from the radiographic image capturing device 1, the frame image for preview is based on the transfer. Is not generated and displayed, and only when the additional signal Sa is attached to the read synchronization signal S1 transmitted from the control unit 70, the image data D for preview transferred from the radiographic image capturing device 1 is displayed. Based on this, a frame image for preview is generated and displayed on the display unit 61 (in the case of modification 1).

Therefore, even if the configuration is as described in the second modification, when the transmission of the unlock signal Sul from the radiation imaging device 1 to the control unit 70 is delayed, as in the case of the above embodiment, It is possible to accurately prevent the image display device 60 from displaying an image in which the subject has not been captured (a frame image for preview in the above example), and to accurately display the image in which the subject has been captured. Become.

Therefore, since the subject is not captured in the image (frame image for preview) displayed on the image display device 60, the photographer feels uncomfortable or the image in which the subject is not captured (frame image for preview). It is possible to accurately prevent the problem that the photographer who sees the image mistakenly thinks that the image has failed and re-imposes the image, resulting in an unnecessarily increased exposure dose of the subject. ..

[Modification 3]
By the way, in the configuration as in the above embodiment or the second modification, the pulse width τ of the read synchronization signal S1 ^{is not only changed between τ and τ *} (that is, as additional information as described above). (In addition to the information indicating that the irradiation of radiation X from the radiation irradiation device 50 has started), the synchronization signal S1 for reading can be configured so that a plurality of pulse widths τ can be set (in the case of the above embodiment). Alternatively, by changing the number of additional signals Sa associated with the read synchronization signal S1 and the elapsed time from the fall of the read synchronization signal S1 (in the case of the modification 2), the radiation imaging apparatus 1 or the image display Not only that the irradiation of the radiation X has been started, but also various information can be added to the reading synchronization signal S1 and transmitted to the device 60.

That is, in the former case, including the case where the pulse width is τ (that is, the case where the read synchronization signal S1 has no additional information added), a plurality of types of information are read for the number of settable pulse widths τ. It can be added to the synchronization signal S1 and transmitted. Further, in the latter case, for example, when three kinds of elapsed times can be set as the elapsed time from the falling edge of the read synchronization signal S1, when there is no additional signal Sa (when only the read synchronization signal S1 is used). ) And 2 ³ = 8 types of information can be added to the read synchronization signal S1 and transmitted.

Then, as the moving image photographing using the radiation image photographing apparatus 1, in addition to the dynamic imaging as shown in FIG. 13, for example, in the tomosynthesis imaging, as shown in FIG. 12, the radiation irradiation device 50 is directed to the subject H. irradiation, and irradiation angle position y ₅₁ of the radiation source 51, while changing the position y ₁ or the like of the radiation image capturing apparatus 1, for capturing a plurality of radiation images (frame images). Further, for example, in shooting using the dual energy subtraction method, the subject H is in an upright state as shown in FIG. 4 or in a state in which the subject H is laid down as shown in FIG. The subject H is usually irradiated with radiation X having different energies E once (twice in total).

At that time, the reading synchronization is synchronized by variously changing the pulse width τ of the reading synchronization signal S1 transmitted from the control unit 70 to the radiation imaging device 1 and the image processing device 60, the number of additional signals Sa, the elapsed time, and the like. As additional information added to the signal S1, information indicating the irradiation position y ₅₁ and the irradiation angle when the radiation source 51 of the irradiation device 50 irradiates the radiation X (for example, in the case of tomosynthesis imaging), and the radiation irradiation device 50 emits radiation. Information representing the irradiation conditions when X is irradiated (for example, the energy E of the radiation X in imaging using the dual energy subtraction method) can be added to the read synchronization signal S1 and transmitted.

As described above, according to the radiation imaging system 100 according to the above-described embodiments and modifications 1 and 2, the radiation irradiation device 50 can be used as additional information by variously changing the additional information added to the reading synchronization signal S1. In addition to the information indicating that the irradiation of the radiation X has been started from, the information indicating the position y _{51 and the} like where the radiation irradiation device 50 has irradiated the radiation X, and the irradiation conditions when the radiation irradiation device 50 has irradiated the radiation X. Information or the like representing the above can be added to the reading synchronization signal S1 and accurately transmitted to and transmitted to the radiation imaging device 1 and the image display device 60.

_{Information such as the position y 51} and imaging conditions transmitted to the radiation image capturing device 1 and the image display device 60 is written and recorded in, for example, image data D or the header of the generated frame image. , It is possible to configure the frame image to be used when analyzing the image or reconstructing the frame image to generate a new image. In the present embodiment and the like, the description has been made on the premise that the image display device 60 performs the generation of the frame image, the image analysis, and the like, but it is also possible to configure the radiation image capturing device 1 to perform these processes. is there.

Further, it goes without saying that the present invention is not limited to the above-described embodiments and modifications, and can be appropriately modified as long as the gist of the present invention is not deviated.

1 Radiation imaging device 7 Radiation detection element 50 Radiation irradiation device 60 Image display device 61 Display unit 70 Control unit 100 Radiation imaging system D Image data, image data for preview E Radiation energy (irradiation conditions)
H Subject O Offset data S1 Sync signal for reading Sa Additional signal (additional information)
Sx Irradiation synchronization signal T Period X Radiation y ₅₁ Position Δτ Increased pulse width (additional information)
τ Pulse width

Claims (10)

In a radiation imaging system equipped with a radiation image capturing device that reads out image data from a plurality of radiation detecting elements arranged in a two-dimensional manner, and capturing a moving image of a radiation image that is irradiated to a subject multiple times by the radiation irradiation device.
A control unit for transmitting a reading synchronization signal to the radiation imaging device and transmitting an irradiation synchronization signal to the radiation irradiation device to perform synchronization control between the radiation imaging device and the radiation irradiation device is provided.
The radiation image capturing device receives the reading synchronization signal to which additional information is added from the control unit, and then extracts the image data or image data for preview from the image data at a predetermined ratio on the image display device. A radiographic imaging system characterized by transferring data. The radiation imaging system according to claim 1, wherein the radiation imaging system further includes the radiation irradiation device. The control unit is characterized in that after starting transmission of the irradiation synchronization signal to the radiation irradiation device, additional information is added to the read synchronization signal transmitted to the radiation imaging device and transmitted. The radiographic imaging system according to claim 1 or 2. The control unit to the radiation irradiation device has a pulse width of the read synchronization signal transmitted to the radiation imaging device before starting transmission of the irradiation synchronization signal to the radiation irradiation device. By significantly changing the pulse width of the read synchronization signal to be transmitted to the radiation imaging apparatus after starting the transmission of the irradiation synchronization signal, additional information is added to the read synchronization signal and transmitted. The radiographic imaging system according to any one of claims 1 to 3, wherein the radiation imaging system is characterized. When the control unit transmits the read synchronization signal to the radiation imaging device after starting the transmission of the irradiation synchronization signal to the radiation irradiation device, before or after the transmission of the read synchronization signal, or after. by sending by accompanying pressurized signal with back and forth, the radiation image according to any one of claims 1 to 4, characterized in that transmitting by adding additional information to the readout synchronization signal Shooting system. In the control unit, as the additional information, in addition to information indicating that the irradiation of radiation from the irradiation device has started, information indicating the position where the irradiation device has irradiated radiation, or information indicating that the radiation irradiation device has irradiated radiation. The radiation imaging system according to any one of claims 1 to 5, wherein information representing irradiation conditions at the time of irradiation is added to the reading synchronization signal and transmitted. The control unit irradiates the radiation irradiation device with the irradiation in the same cycle as the cycle of transmitting the read synchronization signal to the radiation imaging device after starting transmission of the irradiation synchronization signal to the radiation irradiation device. Before starting the transmission of the synchronization signal for reading, the synchronization signal for reading is transmitted to the radiation imaging apparatus.
The radiation imaging device reads out offset data by dark current in a state where no radiation is emitted based on the reading synchronization signal transmitted from the control unit before the radiation is emitted from the radiation irradiation device. The radiographic imaging system according to any one of claims 1 to 6, wherein processing is performed. Equipped with an image display device equipped with a display unit,
The image display device is characterized in that when the image data is transferred from the radiation image capturing device, a frame image or a frame image for preview is generated based on the image data and displayed on the display unit. The radioimaging system according to any one of claims 1 to 7. A radiation imaging device that reads and transfers image data from multiple radiation detection elements arranged in two dimensions, and a radiation imaging device.
An image display device capable of displaying a frame image generated based on the image data transferred from the radiation imaging device, and an image display device.
In a radiation image capturing system that captures a moving image of a radiation image that has been irradiated to a subject multiple times by a radiation irradiation device.
Control that transmits a reading synchronization signal to the radiation imaging device and the image display device, transmits an irradiation synchronization signal to the radiation irradiation device, and performs synchronization control between the radiation imaging device and the radiation irradiation device. Equipped with a unit
The image display device is characterized by displaying the frame image or the frame image for preview generated based on the image data received after receiving the read synchronization signal to which additional information is added from the control unit. Radiation imaging system. The radiation imaging system according to claim 9, wherein the radiation imaging system further includes the radiation irradiation device.

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