Radiation imaging system

Abstract

To perform kymography for generating a plurality of frame images more appropriately even in a state that a radiation irradiation device and a radiographic apparatus are connected to each other by wireless communication connection.SOLUTION: A radiation irradiation device (irradiation device 1) is connected to a radiographic apparatus (imaging apparatus 2) for generating kinetic image data by wireless communication connection, and includes: a signal generation unit (irradiation side control unit 11) for generating a first pulse signal emitted by the radiographic apparatus, a second pulse signal synchronized with a first count value obtained by counting up the first pulse signal, and a second count value obtained by counting up the second pulse signal; and a first determination unit (irradiation side control unit 11) for determining whether or not to start the irradiation of a radioactive ray on the basis of a first timing count value indicating emission timing of an irradiation permission signal permitting irradiation of the radioactive ray by the radiation irradiation device, wirelessly transmitted from the radiographic apparatus, and a second timing count value indicating timing that the irradiation permission signal is received.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a radiation irradiation device, a radiation imaging device, a console, and a program.

Background Art

[0002] Conventionally, a radiation imaging system including a radiation irradiation device that generates radiation and a radiation imaging device that generates image data of a radiation image based on the received radiation has been used to continuously image a subject at regular intervals to obtain a plurality of frame images. By performing dynamic imaging, the dynamic behavior (dynamics) of the subject is analyzed for diagnosis. In dynamic imaging, a deviation (radiation exposure start delay time) may occur between the timing when a signal indicating radiation exposure is input to the radiation irradiation device and the timing when radiation exposure starts from the radiation irradiation device in response thereto. In addition, a deviation (radiation exposure stop delay time) may occur between the timing when a signal indicating the stop of radiation exposure is input to the radiation irradiation device and the timing when the radiation exposure from the radiation irradiation device stops in response thereto. These delay times can affect the image quality of the captured images.

[0003] Regarding this, Patent Document 1 describes a control device that measures the X-ray exposure start delay time from the input of a signal indicating X-ray exposure until the actual X-ray exposure, and the X-ray exposure stop delay time from the input of a signal indicating the stop of X-ray exposure until the actual stop of X-ray exposure, and controls the X-ray exposure based on the delay time.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Incidentally, in a radiation imaging system in which a radiation irradiator and a radiation imaging device are wirelessly connected and operate in synchronization with each other, an exposure permission notification delay time from the timing when the radiation imaging device starts generating an image to the timing when the radiation irradiator starts irradiating radiation, and an exposure stop notification delay time from the timing when the radiation irradiator stops irradiating radiation to the timing when the radiation imaging device finishes generating an image may occur. Since the radiation irradiator and the radiation imaging device are wirelessly connected, the exposure permission notification delay time and the exposure stop notification delay time become unstable depending on the communication environment. In particular, when the exposure permission notification delay time becomes long, there are cases where dynamic imaging of a planned number of frames cannot be performed, and dynamic imaging cannot be suitably performed. Since the control device described in Patent Document 1 does not describe the exposure permission notification delay time and the exposure stop notification delay time, the above-described problems cannot be solved.

[0006] The present invention has been made in view of the above problems, and an object thereof is to enable more suitable dynamic imaging for generating a plurality of frame images even when a radiation irradiator that generates radiation and a radiation imaging device that generates a radiation image are wirelessly connected.

Means for Solving the Problems

[0007] To solve the above problems, the radiation irradiator according to the invention described in claim 1 is A radiation irradiator that is wirelessly connected to a radiation imaging device that generates dynamic image data and performs control for sequentially irradiating a subject with radiation, A signal generation unit that generates a first pulse signal emitted by the radiation imaging device, a second pulse signal synchronized with a first count value obtained by counting up the first pulse signal, and a second count value obtained by counting up the second pulse signal; A first determination unit that determines whether to start radiation irradiation based on a delay time that is the difference between a first timing count value indicating the transmission timing of an irradiation permission signal that permits the radiation irradiation device to irradiate radiation wirelessly transmitted from the radiation imaging device, and a second timing count value indicating the timing when the irradiation permission signal is received. is provided.

[0008] Further, the invention according to claim 2 is the radiation irradiation device according to claim 1, wherein the first determination unit determines to start radiation irradiation when the second timing count value is less than or equal to a value obtained by adding a third timing count value corresponding to an upper limit time from when the radiation imaging device starts generating the dynamic image data to when the radiation irradiation device irradiates radiation to the first timing count value.

[0009] Further, the invention according to claim 3 is the radiation irradiation device according to claim 1 or 2, wherein the first determination unit determines which of a fourth timing count value indicating the timing when the radiation imaging device starts generating the dynamic image data wirelessly transmitted from the radiation imaging device and the second timing count value is larger, and when the fourth timing count value is larger than the second timing count value, determines to start radiation irradiation when the second count value reaches the fourth timing count value.

[0010] Further, the invention according to claim 4 is the radiation irradiation device according to any one of claims 1 to 3, wherein it includes a first transmission unit that transmits information on the timing when radiation irradiation is started to a predetermined external device.

[0011] Further, the radiation imaging device according to claim 5 is a radiation imaging device communicatively connected to the radiation irradiation device according to claim 4, wherein A first specifying unit is provided that specifies, based on information on the timing when the irradiation of the radiation was started, among the generated dynamic image data, the exposure image data generated in a state where the radiation was irradiated.

[0012] Further, the invention according to claim 6 is the radiation imaging apparatus according to claim 5, wherein a first notification unit that notifies by any one of light, sound, and vibration; a first specifying determination unit that determines whether or not the exposure image data can be specified by the first specifying unit; a first notification control unit that controls the first notification unit to notify based on the determination result by the first specifying determination unit.

[0013] Further, the invention according to claim 7 is the radiation imaging apparatus according to claim 6, wherein a second transmission unit that transmits the determination result by the first specifying determination unit to a predetermined external device.

[0014] Further, the radiation imaging apparatus of the invention according to claim 8 is a radiation imaging apparatus that is wirelessly communication-connected to a radiation irradiation device that controls sequential irradiation of radiation to a subject and generates dynamic image data, a second determination unit that determines whether information on the timing when the radiation irradiation device started irradiation of the radiation was received within a predetermined period; when it is determined by the second determination unit that the information on the timing when the radiation irradiation was started was received within the predetermined period, the dynamic image data generated after the timing when the radiation irradiation was started is transmitted to a predetermined external device, and when it is determined that the information on the timing when the radiation irradiation was started was not received within the predetermined period, the dynamic image data generated after the timing when the generation of the dynamic image data was started, and information including unexposed image data in the dynamic image data are transmitted to a predetermined external device.

[0015] Further, the invention according to claim 9 is the radiation imaging apparatus according to any one of claims 5 to 8, wherein It can be stored in a return visit vehicle and is portable.

[0016] Also, the console of the invention according to claim 10 In a console communicatively connected to a radiation irradiation device according to any one of claims 1 to 4, A second specifying unit for specifying exposure image data generated in a state where radiation is irradiated, among the dynamic image data, based on an increase or decrease or a shape of a signal value in the dynamic image data transmitted from the radiation imaging device.

[0017] Also, the invention according to claim 11 is, in the console according to claim 10, A second notification unit that notifies by any one of light, sound, and vibration, A second specifying determination unit that determines whether or not the exposure image data can be specified by the second specifying unit, A second notification control unit that notifies by the second notification unit based on a determination result by the second specifying determination unit.

[0018] Also, the invention according to claim 12 is, in the console according to claim 11, The second notification control unit notifies by the second notification unit based on a determination result of whether or not the radiation imaging device can specify exposure image data, which is transmitted from the radiation imaging device.

[0019] Also, the program of the invention according to claim 13 A computer of a radiation irradiation device that is wirelessly communicatively connected to a radiation imaging device that generates dynamic image data and controls sequential irradiation of radiation to a subject, A signal generation unit that generates a second pulse signal synchronized with the first pulse signal emitted by the radiation imaging device and a first count value obtained by counting up the first pulse signal, and a second count value obtained by counting up the second pulse signal, A first determination unit that determines whether to start radiation irradiation based on a delay time that is the difference between a first timing count value indicating the transmission timing of an irradiation permission signal that permits the radiation irradiation device to irradiate radiation wirelessly transmitted from the radiation imaging device and a second timing count value indicating the timing when the irradiation permission signal is received. Function as.

Effect of the Invention

[0020] According to the present invention, even when a radiation irradiation device that generates radiation and a radiation imaging device that generates a radiation image are wirelessly communication-connected, dynamic imaging that generates a plurality of frame images can be more preferably performed.

Brief Description of the Drawings

[0021]

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Embodiments for Carrying Out the Invention

[0022] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the technical scope of the present invention is not limited to what is illustrated in the drawings.

[0023] <1. Radiation Imaging System> First, an overview of the radiation imaging system (hereinafter, imaging system 100) of the present embodiment will be described. FIG. 1 is a block diagram showing the schematic configuration of the imaging system 100.

[0024] 〔1-1. Schematic Configuration of Radiation Imaging System〕 As shown in FIG. 1, the imaging system 100 of the present embodiment includes a radiation irradiation device (hereinafter, irradiation device 1), one or a plurality of radiation imaging devices (hereinafter, imaging device 2), and an external interface (hereinafter, external IF).

[0025] (Radiation Irradiation Device) The irradiation device 1 generates radiation R (for example, X-rays) and irradiates the radiation R onto the subject and the imaging device 2 arranged behind the subject. It includes a radiation control device (hereinafter, control device 1a) and a tube head 1b. The specific configuration of this control device 1a will be described later.

[0026] (Radiation Imaging Device) The imaging device 2 generates image data by receiving the radiation R from the irradiation device 1 and can communicate with the irradiation device 1. The specific configuration of this imaging device 2 will also be described later.

[0027] (External Interface) The external IF communicably connects, for example, the irradiation device 1 and the imaging device 2. The external IF is composed of, for example, a communication cable 3, a cradle into which the imaging device 2 is inserted, a storage unit 7 of a round-trip vehicle that stores the imaging device 2 described later, and the like. Further, the external IF can disconnect (for example, remove) the connection with at least one of the irradiation device 1 and the imaging device 2 as necessary.

[0028] [1-2. Schematic Operation of the Radiographic System] The imaging system 100 of the present embodiment configured as described above can perform imaging of a subject by irradiating the subject disposed between the irradiation device 1 and the imaging device 2 with radiation R from the irradiation device 1. In addition, the imaging system 100 according to the present embodiment can perform video imaging (hereinafter, dynamic imaging). That is, based on a single imaging operation (pressing of an exposure switch 6a described later), the irradiation device 1 continuously generates pulsed radiation R having a preset time width a plurality of times at regular intervals, and the imaging device 2 can generate a plurality of frame images constituting a video. Dynamic imaging includes video imaging, but does not include imaging of a still image while displaying a video. In addition, a series of images obtained by dynamic imaging is called a dynamic image. The dynamic image includes a video, but does not include an image obtained by imaging a still image while displaying a video.

[0029] In addition, this imaging system 100 can also be configured to communicate with other systems such as a radiology information system (RIS) and a picture archiving and communication system (PACS), and an analysis device.

[0030] [2. Radiation Irradiation Device] Next, the details of the control device 1a included in the irradiation device 1 will be described. FIG. 2 is a block diagram showing the specific configuration of the control device 1a.

[0031] 〔2-1. Specific Configuration of Radiation Irradiation Device〕 As shown in FIG. 2, the control device 1a is composed of an irradiation-side control unit 11, a high-voltage generation unit 12, a storage unit 13, an irradiation-side interface unit (hereinafter referred to as irradiation-side IF unit 14), and the like. In addition, each part 11 to 14 of the control device 1a can be supplied with power by a power cable (not shown) or a built-in power supply.

[0032] The irradiation-side control unit 11 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), etc., and is configured to comprehensively control the operations of each part 12 to 14 of the irradiation device 1. In addition, the irradiation-side control unit 11 includes an oscillator (hereinafter referred to as irradiation-side oscillator 11a). The irradiation-side oscillator 11a can be composed of a crystal oscillator, a ceramic oscillator, etc. that generate a clock with a predetermined period when the power is turned on. The irradiation-side control unit 11 has a function of periodically generating timing information using the clock generated by the irradiation-side oscillator 11a. The timing information generated here includes, for example, a timing signal (second pulse signal) and time information. The timing signal refers to a pulse-like signal output each time one or more clocks are generated. The time information refers to a count value (second count value) obtained by counting up the second pulse signal. In addition, each part 11 to 14 of the irradiation device 1 operates based on the clock generated by the irradiation-side oscillator 11a. In addition, the irradiation-side oscillator 11a may use a plurality of oscillators according to the required accuracy and other purposes.

[0033] Further, the irradiation - side control unit 11 synchronizes the timing signal and the count value with the imaging device 2 by executing the synchronization process described later. That is, the irradiation - side control unit 11 generates a second pulse signal synchronized with the first pulse signal (described later) emitted by the radiation imaging device (imaging device 2) and the first count value (described later) obtained by counting up the first pulse signal, and a second count value obtained by counting up the second pulse signal. At this time, the irradiation - side control unit 11 functions as a signal generation unit. Also, the irradiation - side control unit 11 determines whether to start the irradiation of radiation based on the delay time, which is the difference between the first timing count value indicating the transmission timing of the irradiation permission signal that permits the radiation irradiation device (irradiation device 1) to irradiate radiation wirelessly transmitted from the radiation imaging device (imaging device 2) and the second timing count value indicating the timing when the irradiation permission signal is received, by executing the dynamic imaging process described later. At this time, the irradiation - side control unit 11 functions as a first determination unit. Also, the irradiation - side control unit 11 transmits the information on the timing when the irradiation of radiation is started to a predetermined external device by executing the dynamic imaging process described later. At this time, the irradiation - side control unit 11 functions as a first transmission unit.

[0034] Based on receiving the timing signal from the irradiation - side control unit 11, the high - voltage generation unit 12 applies a voltage corresponding to preset imaging conditions (for example, imaging mode (still - image imaging, dynamic imaging), conditions regarding the subject such as the imaging target site, physique, etc., and conditions regarding the irradiation of radiation R such as tube voltage, tube current, irradiation time, current - time product, etc.) to the X - ray tube 1b. The imaging mode included in the imaging conditions is information regarding the imaging method, such as still - image imaging or dynamic imaging. The imaging system 100 can set the imaging mode in advance, and the high - voltage generation unit 12 performs an operation suitable for the imaging mode according to the setting of the imaging mode. When dynamic imaging is included in the imaging conditions, a pulsed voltage is repeatedly applied at predetermined intervals each time the timing signal is received. When a voltage is applied to the tube sphere 1b from the high voltage generation unit 12, it generates radiation R in an amount corresponding to the applied voltage. Specifically, if a pulsed voltage is applied from the high voltage generation unit 12, it irradiates pulsed radiation R.

[0035] The storage unit 13 is composed of an HDD (Hard Disk Drive), a semiconductor memory, etc., and stores various processing programs, parameters, files, etc. necessary for the execution of the processing programs. Also, the storage unit 13 can store various data (for example, timing information, etc.) generated in the process of the processing performed by the irradiation side control unit 11.

[0036] The irradiation side IF unit 14 can be connected to an external IF and is configured to be able to transmit and receive various information (signals and data). Specifically, it can be composed of a connector or the like for inserting the communication cable 3.

[0037] [2-2. Specific Operation of the Radiation Irradiation Device] The irradiation side control unit 11 of the irradiation device 1 configured as described above operates as follows according to the program stored in the storage unit 13. For example, the irradiation side control unit 11 sets various imaging conditions (imaging mode (still image imaging, dynamic imaging), imaging target site, conditions regarding the subject such as physique, and conditions regarding the irradiation of radiation R such as tube voltage, tube current, irradiation time, current-time product, frame rate, etc.). Also, based on receiving an irradiation permission signal, the irradiation side control unit 11 controls the high voltage generation unit 12 to start irradiation (radiation irradiation). When dynamic imaging is included in the imaging conditions, irradiation is performed at a cycle corresponding to the frame rate.

[0038] [3. Configuration of the Radiation Imaging Device] Next, the specific configuration of the imaging device 2 included in the imaging system 100 will be described. FIG. 3 is a block diagram showing the specific configuration of the imaging device 2.

[0039] 〔3-1. Specific Configuration of the Radiographic Apparatus〕 In addition to a housing (not shown), the imaging apparatus 2 according to the present embodiment includes, as shown in FIG. 3, an imaging side control unit 21, a radiation detection unit 22, a reading unit 23, a storage unit 24, an imaging side interface unit (hereinafter referred to as the imaging side IF unit 25), and the like. Moreover, each part 21 to 25 of the imaging apparatus 2 can be supplied with power by a power cable (not shown) or a built-in power source.

[0040] The imaging side control unit 21 is configured to comprehensively control the operations of each part 22 to 25 of the imaging apparatus 2 using a CPU, a RAM, and the like. The imaging side control unit 21 further includes an oscillator (hereinafter referred to as the imaging side oscillator 21a). The imaging side oscillator 21a can be composed of a crystal oscillator, a ceramic oscillator, or the like that generates a clock with a predetermined period when the power is turned on. The imaging side control unit 21 has a function of periodically generating timing information using the clock generated by the imaging side oscillator 21a. The timing information generated here includes, for example, a timing signal (first pulse signal) and time information. The timing signal refers to a pulse-like signal output each time one or more clocks are generated. The time information refers to a count value (first count value) obtained by counting up the first pulse signal. The format of the timing information generated here is preferably matched with the timing information generated by the irradiation device 1. Moreover, each part 21 to 25 of the imaging apparatus 2 operates based on the clock generated by the imaging side oscillator 21a. Also, the imaging side oscillator 21a may selectively use a plurality of oscillators according to purposes such as required accuracy.

[0041] In addition, the imaging side control unit 21 executes dynamic imaging processing described later, and based on the information on the timing when the radiation irradiation is started, identifies the exposure image data generated in the state where the radiation is irradiated among the generated dynamic image data. At this time, the imaging side control unit 21 functions as a first specifying unit.

[0042] The radiation detection unit 22 may have a substrate on which a plurality of pixels having a radiation detection element that directly or indirectly generates charges according to the dose of radiation R received from the outside and a switch element provided between each radiation detection element and the wiring and capable of switching between an on state in which energization between the radiation detection element and the wiring is possible and an off state in which energization is impossible are two-dimensionally arranged, and a conventionally known one can be used. That is, the imaging device 2 may be a so-called indirect type that includes a scintillator and detects the light emitted when the scintillator receives the radiation R, or a so-called direct type that directly detects the radiation R without passing through a scintillator or the like.

[0043] The reading unit 23 may be configured to be able to read a signal value corresponding to the amount of charges (generated by the radiation detection element) accumulated in each of the plurality of radiation detection elements and generate image data of a radiation image based on each signal value, and a conventionally known one can be used.

[0044] The storage unit 24 is composed of an HDD, a semiconductor memory, etc., and stores various processing programs including various image processing programs, parameters, files, etc. necessary for the execution of the programs. In addition, the storage unit 24 can store various data (for example, timing information, etc.) generated in the process of processing performed by the imaging side control unit 21.

[0045] The imaging side IF unit 25 can be connected to an external IF and is configured to be able to transmit and receive various information (signals and data). Specifically, it can be composed of a connector or the like for inserting the communication cable 3.

[0046] When the imaging device 2 is configured to receive power supply from a built-in power source, the built-in power source may be a lithium ion capacitor (LiC), a lithium ion battery (LiB), or other power sources. Since a lithium-ion capacitor enables rapid charging and does not catch fire, after finishing shooting (for example, shooting during a round-trip consultation), the next shooting can be carried out in a short time. On the other hand, since a lithium-ion battery is inexpensive and has a large capacity, the manufacturing cost of the imaging device 2 can be reduced, and the number of charging times can be decreased. Either configuration is preferable for performing multiple shootings.

[0047] 〔3-2. Specific Operations of the Radiographic Apparatus〕 The imaging-side control unit 21 of the imaging device 2 configured as described above operates as follows according to the program stored in the storage unit 24. For example, the imaging-side control unit 21 has a function of switching the state of the imaging device 2 to any one of an "initialization state", an "accumulation state", and a "reading / transfer state".

[0048] The "initialization state" is a state in which an on-voltage is applied to each switch element, and the charges generated by the radiation detection element are not accumulated in each pixel (the charges are released to the signal lines). The "accumulation state" is a state in which an off-voltage is applied to each switch element, and the charges generated by the radiation detection element can be accumulated in the pixel (the charges are not released to the signal lines). The "reading / transfer state" is a state in which an on-voltage is applied to each switch element and the reading unit 23 is driven so that the signal value based on the flowing-in charges can be read.

[0049] Note that repeating the operation of setting the above-described initialization state before performing dynamic imaging consumes a lot of power. Therefore, the imaging device 2 may start repeating the operation of setting the initialization state before dynamic imaging when a predetermined operation is performed by the user, or may set a time equivalent to a workflow as wait and automatically start after the elapse of wait. In this way, power consumption can be suppressed during a series of workflows.

[0050] <4. Follow-up Imaging System> Next, the details of the follow-up imaging system 100A configured using the above imaging system 100 will be described. FIG. 4 is a block diagram showing an example of the follow-up imaging system 100A.

[0051] 〔4-1. Background〕 When performing imaging using an imaging table installed in a hospital's imaging room, communication cables and power cables are connected to the imaging device 2 installed on the imaging table, enabling information transmission and reception between the irradiation device 1 and power supply to the imaging device 2, etc. For example, when using a communication cable to connect to the above imaging device 2, by including a pulse signal or a timing signal in the control signal of the communication cable, it becomes possible to perform imaging while synchronizing the timing of the irradiation device 1 and the imaging device 2. However, for example, even in imaging in an imaging room, there may be cases where imaging has to be performed with the subject still on a wheelchair or bed. In such cases, when imaging with the communication cable connected to the imaging device 2, · The communication cable gets in the way · There is a risk that the communication cable may come loose and cause communication failure · Since the communication cable touches the subject, there is a problem in terms of hygiene There are such problems, and there has been a desire to perform imaging without using a communication cable.

[0052] On the other hand, when performing imaging while moving with the follow-up imaging system 100A, imaging is performed in the ward where the subject is convalescing. In this case, imaging is performed on the bed on which the subject is lying, and it is necessary to take out the imaging device 2 from the storage unit 7 and place the imaging device 2 between the subject and the bed to perform imaging. In this case, more than when performing imaging in the above imaging room, there are problems such as the communication cable getting in the way, the risk that the communication cable may come loose and cause communication failure, and the communication cable touching the subject, resulting in a problem in terms of hygiene. There has been a desire to perform imaging without using a communication cable. In particular, in imaging using CR (Computed Radiography), since a communication cable was not required during imaging, there was a demand to perform imaging without using a communication cable in imaging using the imaging apparatus 2 in order to obtain the same ease of operation as CR.

[0053] Therefore, it is also possible to use the imaging system 100 of the present embodiment configured as described above as a mobile imaging system 100A (of course, it is also possible to install and use it in an imaging room of a hospital or the like).

[0054] [4-2. Specific Configuration of Mobile Imaging System] As shown in FIG. 4, the mobile imaging system 100A is composed of a mobile cart 1A and the above-described imaging apparatus 2 (in FIG. 4, the illustration of the X-ray tube 1b is omitted).

[0055] The mobile cart 1A includes, in addition to the above-described control device 1a, a console 5, an operation panel 6, a storage unit 7, a charging unit 8, an access point 9, and wheels (not shown), and is configured to be movable.

[0056] The console 5 can set imaging conditions (imaging mode (still image imaging, dynamic imaging), tube voltage, tube current and irradiation time or current-time product (mAs value), imaging site, imaging direction, etc.) for at least one of the control device 1a and the imaging apparatus 2 based on an imaging order acquired from another system (HIS, RIS, etc.) or an operation performed on the operation panel 6 by a user (e.g., a radiologic technologist). In addition, the console 5 can acquire the image data of the radiation image generated by the imaging apparatus 2, save it in itself, or transmit it to another device (PACS, dynamic analysis device, etc.).

[0057] In addition, by executing the dynamic imaging process described later, the console 5 identifies the exposure image data generated in a state where radiation is irradiated among the dynamic image data transmitted from the radiation imaging apparatus (imaging apparatus 2) based on the increase or decrease or the shape of the signal values in the dynamic image data. At this time, the console 5 functions as a second identifying unit.

[0058] The operation panel 6 is provided with an exposure switch 6a. Based on the fact that the exposure switch 6a has been pressed, the console 5 is configured to transmit a shooting start signal to the control device 1a. That is, pressing the exposure switch 6a is an exposure start operation. Also, based on the fact that the exposure switch 6a has been released, the console 5 is configured to transmit a shooting stop signal to the control device 1a. That is, releasing the exposure switch 6a is an exposure stop operation.

[0059] The storage unit 7 is configured to be able to store the imaging apparatus 2. In addition, the storage unit 7 has an external IF that is connected to the imaging side IF unit 25 when the imaging apparatus 2 is stored. Specifically, the tip of the communication cable 3 is attached to a location inside the storage unit 7 that faces the imaging side IF unit 25.

[0060] The charging unit 8 is for charging the built-in power source of the imaging apparatus 2. The charging unit 8 may be charged by receiving power supply from an external power source (for example, a hospital outlet), may be charged by receiving power supply from the power source provided in the mobile examination vehicle 1A, or may be charged using its own power source.

[0061] The access point 9 performs wireless communication with the imaging apparatus 2 using a wireless LAN (Local Area Network) or the like.

[0062] <5. Dynamic Imaging Using the Mobile Examination Imaging System> 〔5-1. Dynamic Imaging Operation〕 Next, the dynamic imaging operation performed by the mobile examination imaging system 100A shown in FIG. 5 will be described. First, in the follow-up imaging system 100A, when the user presses the exposure switch 6a, which is an exposure start operation, a request for exposure permission is sent from the control device 1a to the imaging device 2, and the generation of image data is started in the imaging device 2. Let the timing at this time be T1. Next, an exposure permission notification, which is an irradiation permission signal, is sent from the imaging device 2 to the control device 1a, and the control device 1a starts the exposure. Let the timing at this time be T2. Here, let T1 to T2 be the exposure permission notification delay time. In the exposure permission notification delay time, unexposed image data, which is image data generated in a state where no exposure is performed, is generated. After that, before the user takes the maximum number of shots that can be taken, when the user releases the exposure switch 6a, which is an exposure stop operation, the control device 1a stops the exposure and sends an exposure stop notification, which is an irradiation stop signal, to the imaging device 2. Let the timing at this time be T3. Next, the imaging device 2 stops generating image data based on the received exposure stop notification. Let the timing at this time be T4. Here, let T3 to T4 be the exposure stop notification delay time. In the exposure stop notification delay time, unexposed image data is generated.

[0063] The number of image data that can be generated in the follow-up imaging system 100A has an upper limit due to design constraints such as the storage area of the storage unit 24 of the imaging device 2 and noise effects over time. If exposure is performed when the number of image data that can be generated reaches the upper limit and image data cannot be generated, it will result in wasted exposure. Therefore, in order to prevent wasted exposure, the sum of the number of shots that can be taken and the number of unexposed image data generated during the exposure permission notification delay time must be less than or equal to the upper limit of the number of generated image data, which is the upper limit of the number of shots due to design constraints. In addition, as a diagnostic image for diagnosis, it is necessary to acquire only the exposure image data generated in the state where exposure is being performed. Also, in a dynamic analysis device that analyzes dynamic images, it is necessary to acquire only the exposure image data in order to correctly analyze the dynamic images. Therefore, it is necessary to specify the exposure image data from the image data generated by the imaging device 2. In order to achieve the above requirements, in the return visit imaging system 100A, the processes shown in FIGS. 6 to 13 are executed.

[0064] [5-2. Synchronization process] First, the user performs an operation that triggers the start of timing by the irradiation side control unit 11 of the control device 1a and the imaging side control unit 21 of the imaging device 2 (for example, turns on the power of each device of the return visit imaging system 100A, etc.). Then, the irradiation side control unit 11 and the imaging side control unit 21 start timing respectively. At this time, if the timing of turning on the power of each device is different, the timing start timing of the irradiation side control unit 11 and the timing start timing of the imaging side control unit 21 will also be different, and the timing information generation timing by the control device 1a and the timing information generation timing by the imaging device 2 will be different at this stage.

[0065] Here, when the imaging device 2 is housed in the housing unit 7 and the irradiation side IF unit 14 of the control device 1a and the imaging side IF unit 25 of the imaging device 2 are connected, the synchronization process shown in FIG. 6 is started in the control device 1a, the imaging device 2, and the console 5.

[0066] In the synchronization process, first, the console 5 transmits a timing information synchronization instruction to the imaging device 2 (step A1). Next, the imaging side control unit 21 that has received the timing information synchronization instruction transmits a timing information synchronization start request to the control device 1a (step A2). Next, the irradiation side control unit 11 that has received the timing information synchronization start request initializes the count value that is the time information and transmits the generated timing information to the imaging device 2 (step A3). Next, the imaging-side control unit 21 that has received the timing information synchronizes its own timing information at the time of receiving the timing information based on the received timing information (step A4). Specifically, the imaging-side control unit 21 generates a copy signal whose rising timing is equal to that of the timing signal based on the timing signal transmitted by the control device 1a, and also synchronizes the count value. Note that the copy signal may start from the falling timing or may include an error within the required accuracy. That is, the irradiation-side control unit 11 and the imaging-side control unit 21 generate timing information with the same count value at the same timing. Next, the imaging-side control unit 21 transmits a timing information synchronization completion notification to the console 5 (step A5). Next, the console 5 receives the timing information synchronization completion notification and ends the process.

[0067] Thereafter, when the user disconnects the connection between the irradiation-side IF unit 14 and the imaging-side IF unit 25 (moves the imaging device 2 to the imaging position), the imaging device 2 performs independent timing. At this time, the timing information of the control device 1a and the imaging device 2 is in a synchronized state.

[0068] 〔5-3. Dynamic imaging process〕 Next, the dynamic imaging process shown in FIG. 7, which is executed in the control device 1a, the imaging device 2, and the console 5, will be described. In the mobile imaging system 100A in which the timing information of the control device 1a and the imaging device 2 is synchronized, when the user presses the exposure switch 6a, the dynamic imaging process is executed.

[0069] In the dynamic imaging process, first, the console 5 transmits a shooting start signal to the control device 1a (step B1). Next, the irradiation-side control unit 11 that has received the shooting start signal transmits an exposure permission request to the imaging device 2 (step B2). Next, the imaging-side control unit 21 that has received the exposure permission request starts generating image data. Then, the imaging-side control unit 21 transmits information of N1 (= n1 + m), which is obtained by adding a count value m (third timing count value) corresponding to the upper limit time of the exposure permission notification delay time to the count value n1 (first timing count value) at the start of image data generation, together with the exposure permission notification to the control device 1a (step B3). The upper limit time of the exposure permission notification delay time is preset based on the upper limit number of shootings and the number of shootable images. Next, the irradiation-side control unit 11 that has received the exposure permission notification and the information of N1 determines whether the count value n2 (second timing count value) at the time of receiving the exposure permission notification is equal to or less than N1 (step B4). When n2 is equal to or less than N1 (step B4; YES), the irradiation-side control unit 11 controls the high-voltage generation unit 12 to start exposure (step B5). Also, when n2 is greater than N1 (step B4; NO), the irradiation-side control unit 11 disallows exposure (step B6) and ends this process. As a result, the number of image data (n2 - n1) generated during the exposure permission notification delay time becomes equal to or less than the count value m corresponding to the upper limit time of the exposure permission notification delay. That is, the sum of the number of shootable images and the number of image data generated during the exposure permission notification delay time becomes equal to or less than the upper limit number of shootings, and unnecessary exposure can be prevented.

[0070] After step B5, the irradiation-side control unit 11 transmits the information of n2 as the information on the timing when the radiation irradiation was started to the imaging device 2 (step B7). Next, the imaging-side control unit 21 that has received the information of n2 sequentially transmits the image data generated after n2 to the console 5 (step B8). Next, the console 5 determines whether the exposure switch 6a has been released by the user before the maximum number of shootable images is reached (step B9). When the exposure switch 6a has not been released (step B9; NO), the console 5 transfers this process to step B9. When the exposure switch 6a is released (step B9; YES), the console 5 transmits a shooting stop signal to the control device 1a (step B10). Next, the irradiation side control unit 11 that has received the shooting stop signal controls the high voltage generation unit 12 to stop the exposure (step B11). Next, the irradiation side control unit 11 transmits the information of the count value n3 at the time of exposure stop to the imaging device 2 together with the exposure stop notification (step B12). The imaging side control unit 21 that has received the exposure stop notification and the information of n3 ends the generation of the image data, transmits the image data generated up to n3 to the console 5 (step B13), and ends this process. Here, the imaging side control unit 21 specifies the image data generated from n2 to n3 as the exposure image data.

[0071] (Modification Example 1) Next, Modification Example 1 of the above embodiment will be described. FIG. 8 is a flowchart showing the dynamic imaging process of this modification example. Hereinafter, the description will focus on the differences from the above embodiment. The configuration of the home visit imaging system 100A of this modification example is the same as that of the home visit imaging system 100A of the above embodiment.

[0072] In the dynamic imaging process of this modification example shown in FIG. 8, first, the console 5 performs step C1 similar to step B1 of the dynamic imaging process of the above embodiment. Next, the irradiation side control unit 11 performs step C2 similar to step B2 of the dynamic imaging process of the above embodiment. Next, it is assumed that the imaging side control unit 21 starts generating image data after a predetermined time has elapsed. The count value after the predetermined time is na (the fourth timing count value). Also, the predetermined time may be set to the average value of the exposure permission notification delay time or the like. Then, the imaging side control unit 21 transmits the information of na and the information of N2 (= na + m) obtained by adding the count value m corresponding to the upper limit time of the exposure permission notification delay time to the na to the control device 1a together with the exposure permission notification (step C3). Next, the irradiation side control unit 11 that has received the information of na, the information of N2, and the exposure permission notification determines whether n2, which is the count value at the time of receiving the exposure permission notification, is less than na (step C4). When n2 is less than na (step C4; YES), the irradiation side control unit 11 determines whether the count value has become na (step C5). When the count value has not become na (step C5; NO), the irradiation side control unit 11 transfers this process to step C5. That is, the irradiation side control unit 11 waits until the count value becomes na. When the count value has become na (step C5; YES), the irradiation side control unit 11 controls the high voltage generation unit 12 to start exposure (step C6). At the same time, the imaging side control unit 21 starts generating image data and sequentially transmits the generated image data to the console 5 (step C7).

[0073] Also, when n2 is not less than na (step C4; NO), the irradiation side control unit 11 determines whether n2 is less than or equal to N2 (step C8). When n2 is less than or equal to N2 (step C8; YES), the irradiation side control unit 11 transfers this process to step C6. In this case, next, the irradiation side control unit 11 transmits the information of n2 as the information of the timing when the radiation irradiation was started to the imaging device 2. After that, instead of step C7, the imaging side control unit 21 that has received the information of n2 sequentially transmits the image data generated after n2 to the console 5. Also, when n2 is greater than N2 (step C8; NO), the irradiation side control unit 11 disallows exposure (step C9) and ends this process.

[0074] After step C7, the console 5 performs steps C10 and C11 similar to steps B9 and B10 of the dynamic imaging process of the above embodiment. Next, the irradiation side control unit 11 performs steps C12 and C13 similar to steps B11 and B12 of the dynamic imaging process of the above embodiment. Next, the imaging-side control unit 21 performs step C14 similar to step B13 of the dynamic imaging process of the above embodiment, and ends this process. Here, the imaging-side control unit 21 specifies the image data generated at na to n3 (when n2 ≤ na) or n2 to n3 (when n2 > na) as the exposure image data.

[0075] In the dynamic imaging process of Modification 1, when n2 is less than na, it is possible to prevent unexposed image data from being generated during the exposure permission notification delay time.

[0076] (Modification 2) Next, Modification 2 of the above embodiment will be described. FIG. 9 is a flowchart showing the dynamic imaging process of this modification. Hereinafter, the description will focus on the differences from the above embodiment. The configuration of the home visit imaging system 100A of this modification is the same as that of the home visit imaging system 100A of the above embodiment. In the dynamic imaging process of this modification, the identification of the exposure image data is performed by the console 5 after the generation of the image data is completed.

[0077] In the dynamic imaging process of this modification shown in FIG. 9, first, the console 5 performs step D1 similar to step B1 of the dynamic imaging process of the above embodiment. Next, the irradiation-side control unit 11 performs step D2 similar to step B2 of the dynamic imaging process of the above embodiment. Next, the imaging-side control unit 21 starts generating the image data. Then, the imaging-side control unit 21 transmits information of N1 (= n1 + m), which is obtained by adding the count value m corresponding to the upper limit time of the exposure permission notification delay time to the count value n1 at the start of image data generation, to the control device 1a together with the exposure permission notification. Then, the imaging-side control unit 21 sequentially transmits the generated image data to the console 5 (step D3). Next, the irradiation-side control unit 11 performs steps D4 to D6 similar to steps B4 to B6 of the dynamic imaging process of the above embodiment. Next, the console 5 performs steps D7 and D8 similar to steps B9 and B10 of the dynamic imaging process of the above embodiment. Next, the irradiation side control unit 11 performs step D9 similar to step B11 of the dynamic imaging process of the above embodiment. Next, the irradiation side control unit 11 transmits an exposure stop notification to the imaging device 2 (step D10). Upon receiving the exposure stop notification, the imaging side control unit 21 ends the generation of image data and transmits the generated image data to the console 5 (step D11). Next, the console 5 transmits a transmission request for the range of the count values for which exposure has been performed to the control device 1a (step D12). Next, the irradiation side control unit 11 transmits the range of the count values for which exposure has been performed to the console 5 (step D13). Next, based on the received range of the count values for which exposure has been performed, the console 5 identifies the exposed image data from the image data transmitted from the imaging device 2 (step D14), and ends this process.

[0078] (Modification Example 3) Next, modification example 3 of the above embodiment will be described. FIG. 10 is a flowchart showing the dynamic imaging process of this modification example. Hereinafter, the description will focus on the differences from the above embodiment. The imaging device 2 of the follow-up imaging system 100A of this modification example includes a radiation sensor that detects radiation, and identifies unexposed image data and exposed image data according to an increase or decrease in the detection value of the radiation sensor. Further, the imaging device 2 may identify unexposed image data and exposed image data according to an increase or decrease in the signal value read by the reading unit 23. Further, the imaging device 2 may identify unexposed image data and exposed image data according to the shape within the generated image data.

[0079] In the dynamic imaging process of this modification example shown in FIG. 10, first, the console 5 performs step E1 similar to step B1 of the dynamic imaging process of the above embodiment. Next, the irradiation side control unit 11 performs step E2 similar to step B2 of the dynamic imaging process of the above embodiment. Next, the imaging side control unit 21 starts generating image data. Then, the imaging side control unit 21 transmits information of N1 (= n1 + m), which is obtained by adding the count value m corresponding to the upper limit time of the exposure permission notification delay time to the count value n1 at the start of image data generation, to the control device 1a together with the exposure permission notification. Then, the imaging side control unit 21 sequentially transmits the image data identified as the exposure image data by the above specific method among the generated image data to the console 5 (step E3). Next, the irradiation side control unit 11 performs steps E4 to E6 similar to steps B4 to B6 of the dynamic imaging process of the above embodiment. Next, the console 5 performs steps E7 and E8 similar to steps B9 and B10 of the dynamic imaging process of the above embodiment. Next, the irradiation side control unit 11 performs step E9 similar to step B11 of the dynamic imaging process of the above embodiment. Next, the irradiation side control unit 11 transmits an exposure stop notification to the imaging device 2 (step E10). Upon receiving the exposure stop notification, the imaging side control unit 21 ends the generation of image data, transmits the image data identified as the exposure image data by the above specific method among the generated image data to the console 5 (step E11), and ends this process.

[0080] (Modification Example 4) Next, Modification Example 4 of the above embodiment will be described. FIG. 11 is a flowchart showing the dynamic imaging process of this modification example. Hereinafter, the description will focus on the differences from the above embodiment. The configuration of the home visit imaging system 100A of this modification example is the same as that of the home visit imaging system 100A of the above embodiment. In the dynamic imaging process of this modification example, the console 5 sequentially performs the identification of the exposure image data on the image data transmitted by the imaging device 2.

[0081] In the dynamic imaging process of this modification example shown in FIG. 10, first, the console 5 performs step F1 similar to step B1 of the dynamic imaging process of the above embodiment. Next, the irradiation side control unit 11 performs step F2 similar to step B2 of the dynamic imaging process of the above embodiment. Next, the imaging side control unit 21 starts generating image data. Then, the imaging side control unit 21 transmits information of N1 (= n1 + m), which is obtained by adding the count value m corresponding to the upper limit time of the exposure permission notification delay time to the count value n1 at the start of image data generation, together with the exposure permission notification to the control device 1a. Then, the imaging side control unit 21 sequentially transmits the generated image data to the console 5 (step F3). Next, the console 5 identifies the exposure image data among the transmitted image data based on the increase or decrease of the signal value or the shape in the transmitted image data (step F4). Next, the irradiation side control unit 11 performs steps F5 to F7 similar to steps B4 to B6 of the dynamic imaging process of the above embodiment. Next, the console 5 performs steps F8 and F9 similar to steps B9 and B10 of the dynamic imaging process of the above embodiment. Next, the irradiation side control unit 11 performs step F10 similar to step B11 of the dynamic imaging process of the above embodiment. Next, the irradiation side control unit 11 transmits an exposure stop notification to the imaging device 2 (step F11). Upon receiving the exposure stop notification, the imaging side control unit 21 ends the generation of image data and transmits the generated image data to the console 5 (step F12). Next, the console 5 identifies the exposure image data among the transmitted image data based on the increase or decrease of the signal value or the shape in the transmitted image data (step F13), and ends this process.

[0082] (Modification 5) Next, Modification 5 of the above embodiment will be described. FIG. 12 is a flowchart showing the dynamic imaging process of this modification. Hereinafter, the description will focus on the differences from the above embodiment. The configuration of the home visit imaging system 100A of this modification is the same as that of the home visit imaging system 100A of the above embodiment. The dynamic shooting process of this modified example is a case where, before shooting all the available shots as in the above embodiment, the shooting limit is reached without the exposure switch 6a being released by the user.

[0083] In the dynamic shooting process of this modified example shown in FIG. 12, first, the console 5 performs step G1 similar to step B1 in the dynamic shooting process of the above embodiment. Next, the irradiation - side control unit 11 performs step G2 similar to step B2 in the dynamic shooting process of the above embodiment. Next, the shooting - side control unit 21 performs step G3 similar to step B3 in the dynamic shooting process of the above embodiment. Next, the irradiation - side control unit 11 performs steps G4 - G7 similar to steps B4 - B7 in the dynamic shooting process of the above embodiment. Next, the shooting - side control unit 21 performs step G8 similar to step B8 in the dynamic shooting process of the above embodiment. Next, the irradiation - side control unit 11 determines whether the image data generated after n2 in the imaging device 2 has reached the shooting limit (step G9). If the shooting limit has not been reached (step G9; NO), the irradiation - side control unit 11 transfers this process to step G9. If the shooting limit has been reached (step G9; YES), the irradiation - side control unit 11 controls the high - voltage generation unit 12 to stop the exposure (step G10).

[0084] Also, after step G8, the shooting - side control unit 21 determines whether the image data generated after n2 in the imaging device 2 has reached the shooting limit (step G11). If the shooting limit has not been reached (step G11; NO), the shooting - side control unit 21 transfers this process to step G11. If the shooting limit has been reached (step G11; YES), the shooting - side control unit 21 ends the generation of the image data, transmits the generated image data to the console 5 (step G12), and ends this process. Here, the shooting - side control unit 21 identifies the image data generated after n2 as the exposed image data. Since the timing information of the control device 1a and the imaging device 2 is synchronized, the exposure stop in step G10 and the end of image data generation in step G12 of the dynamic imaging process of this modification can be performed simultaneously. Therefore, it is possible to prevent unexposed image data from being generated during the exposure stop notification delay time.

[0085] (Modification 6) Next, Modification 6 of the above embodiment will be described. FIG. 13 is a flowchart showing the dynamic imaging process of this modification. Hereinafter, the description will focus on the differences from the above embodiment. The imaging device 2 of this modification includes a first notification unit (not shown) that notifies the user with light, sound, vibration, etc. The console 5 also includes a second notification unit (not shown) that notifies the user with light, sound, vibration, etc. In addition, the dynamic imaging process of this modification is a case where communication between the control device 1a and the imaging device 2 becomes impossible due to a communication failure occurring between the control device 1a and the imaging device 2 after step B3 in the dynamic imaging process of the above embodiment, and the exposure switch 6a is not released by the user before the number of available shots is exhausted.

[0086] In the dynamic imaging process of this modification shown in FIG. 13, first, the console 5 performs step H1, which is the same as step B1 of the dynamic imaging process of the above embodiment. Next, the irradiation side control unit 11 performs step H2, which is the same as step B2 of the dynamic imaging process of the above embodiment. Next, the imaging side control unit 21 performs step H3, which is the same as step B3 of the dynamic imaging process of the above embodiment. Next, the irradiation side control unit 11 performs steps H4 to H7, which are the same as steps B4 to B7 of the dynamic imaging process of the above embodiment. Next, the irradiation side control unit 11 determines whether the image data generated after n2 in the imaging device 2 has reached the number of available shots (step H8). When the number of possible shots has not been reached (step H8; NO), the irradiation side control unit 11 shifts this process to step H8. When the number of possible shots has been reached (step H8; YES), the irradiation side control unit 11 controls the high voltage generation unit 12 to stop irradiation (step H9).

[0087] Also, after step H3, the imaging side control unit 21 determines whether it has received the information of n2 from the control device 1a (step H10). As shown in FIG. 7, when communication is possible between the control device 1a and the imaging device 2 and the imaging side control unit 21 has received the information of n2 (step H10; YES), the imaging side control unit 21 shifts this process to step B8 in FIG. 7, that is, sequentially transmits the image data generated after n2 to the console 5. When the information of n2 is not received (step H10; NO), the imaging side control unit 21 determines whether the count value has become N1 (step H11). When the count value has not become N1 (step H11; NO), the imaging side control unit 21 shifts this process to step H10. That is, the imaging side control unit 21 waits for the information of n2 to be received until the count value becomes N1. This is because there is a possibility that the information of n2 is transmitted to the imaging device 2 as the information of the timing when the irradiation side control unit 11 starts radiation irradiation until N1. Also, when the count value has become N1 (step H11; YES), the imaging side control unit 21 sequentially transmits the image data generated after n1 to the console 5 together with the information that the unexposed image data is included in the image data generated after n1 (step H12). The reason why the unexposed image data is included in the image data generated after n1 is that the imaging side control unit 21 cannot obtain the count value at which the irradiation was performed because communication between the control device 1a and the imaging device 2 has been disabled, and the exposed image data cannot be specified. That is, in steps H10 and H11, the imaging side control unit 21 determines whether information (n2) on the timing when the radiation irradiation device (irradiation device 1) starts radiation irradiation is received within a predetermined period (until the count value reaches N1). Here, the imaging side control unit 21 functions as a second determination unit. Further, when it is determined by the second determination unit that the information on the timing of starting radiation irradiation is received within the predetermined period, the imaging side control unit 21 transmits the moving image data generated after the timing (n2) of starting radiation irradiation to a predetermined external device (for example, console 5). When it is determined that the information on the timing of starting radiation irradiation is not received within the predetermined period, in step H12, the imaging side control unit 21 transmits the moving image data generated after the timing (n1) of starting generation of the moving image data, and information indicating that the unexposed image data is included in the moving image data to be transmitted, to a predetermined external device (for example, console 5). Here, the imaging side control unit 21 functions as a third transmission unit.

[0088] Next, the imaging side control unit 21 determines whether the number of image data generated after the start of image data generation (after n1) in the imaging device 2 has reached the upper limit of imaging (step H13). If the upper limit of imaging has not been reached (step H13; NO), the imaging side control unit 21 transfers this process to step H13. If the upper limit of imaging has been reached (step H13; YES), the imaging side control unit 21 ends the generation of the image data, and transmits the generated image data to the console 5 together with the information indicating that the unexposed image data is included in the image data to be transmitted (step H14). Next, the imaging side control unit 21 controls the first notification unit to perform a notification indicating that the transmitted image data includes unexposed image data (step H15).

[0089] Next, the console 5 that has received the information indicating that the unexposed image data is included in the image data and the image data controls the second notification unit to perform a notification indicating that the unexposed image data is included in the image data (step H16). Next, the console 5 transmits a transmission request for the range of the count values for which irradiation has been performed to the control device 1a (step H17). Next, the irradiation side control unit 11 transmits the range of the count values for which irradiation has been performed to the console 5 (step H18). Next, based on the received range of the count values for which irradiation has been performed, the console 5 specifies the exposure image data from among the image data transmitted from the imaging device 2 (step H19), and ends this process.

[0090] In steps H15 and H16 of the above-described modification 6, by performing notification indicating that the image data includes unexposed image data, it is possible to prompt the user to check the image and delete the unexposed image.

[0091] Here, the imaging device 2 of the above-described embodiment, modification 1, modification 3, and modification 5 may include a first notification unit similar to that of modification 6. Further, in the above-described embodiment, modification 1, modification 3, and modification 5, the imaging side control unit 21 was assumed to specify the exposure image data. Here, the imaging side control unit 21 may determine whether or not it was able to specify the exposure image data by the first specifying unit. Here, the imaging side control unit 21 functions as a first specifying determination unit. Then, the imaging side control unit 21 transmits the determination result by the first specifying determination unit to a predetermined external device (for example, the console 5). Here, the imaging side control unit 21 functions as a second transmission unit. Then, the imaging side control unit 21 controls the first notification unit to perform notification indicating the determination result by the first specifying determination unit. Here, the imaging side control unit 21 functions as a first notification control unit. Further, the console 5 may include a second notification unit similar to that of modification 6. The console 5 that has received the determination result of whether or not the exposure image data could be specified in the imaging device 2 transmitted from the imaging device 2 controls the second notification unit to perform notification indicating the determination result. Note that a configuration in which another device such as the control device 1a includes a notification unit, the imaging side control unit 21 transmits the determination result by the first specifying determination unit to another device, and the other device that has received the determination result controls the notification unit to perform notification indicating the determination result may also be employed. Also, in Modification Example 2, Modification Example 4, and Modification Example 6 described above, the console 5 was assumed to identify the exposure image data. Here, the console 5 may determine whether it was able to identify the exposure image data by the second identification unit. Here, the console 5 functions as a second identification determination unit. Then, the console 5 controls the second notification unit to perform notification indicating the determination result by the second identification determination unit. Here, the console 5 functions as a second notification control unit.

[0092] 〔Effect〕 The radiation irradiation device (irradiation device 1) included in the radiation imaging system 100 (return visit imaging system 100A) according to the present embodiment described above is wirelessly communication-connected to a radiation imaging device (imaging device 2) that generates dynamic image data, and is a radiation irradiation device that performs control for sequentially irradiating a subject with radiation. The radiation irradiation device includes a signal generation unit (irradiation side control unit 11) that generates a first pulse signal emitted by the radiation imaging device, a second pulse signal synchronized with the first count value obtained by counting up the first pulse signal, and a second count value obtained by counting up the second pulse signal, and a first determination unit (irradiation side control unit 11) that determines whether to start radiation irradiation based on a delay time that is a difference between a first timing count value (n1) indicating the transmission timing of an irradiation permission signal for permitting the radiation irradiation device to irradiate radiation wirelessly transmitted from the radiation imaging device and a second timing count value (n2) indicating the timing when the irradiation permission signal was received. Therefore, even when a radiation irradiation device that generates radiation and a radiation imaging device that generates a radiation image are in a state of being wirelessly communication-connected, the first determination unit can determine the quality of the communication state, and dynamic imaging for generating a plurality of frame images can be performed more preferably.

[0093] Also, in the radiation irradiation device, the first determination unit determines to start radiation irradiation when the second timing count value is equal to or less than a value obtained by adding a third timing count value (m) corresponding to an upper limit time from when the radiation imaging device starts generating dynamic image data to when the radiation irradiation device irradiates radiation to the first timing count value. Therefore, it is possible to prevent the wasteful exposure in which exposure is performed in a state where image data cannot be generated.

[0094] In the radiation irradiation apparatus, the first determination unit determines which of the fourth timing count value (na) indicating the timing at which the radiation imaging apparatus starts generating dynamic image data and the second timing count value wirelessly transmitted from the radiation imaging apparatus is larger. When the fourth timing count value is larger than the second timing count value, it is determined that the irradiation of radiation is started when the second count value reaches the fourth timing count value. Therefore, when n2 is less than na, it is possible to prevent unexposed image data from being generated during the exposure permission notification delay time.

[0095] The radiation irradiation apparatus further includes a first transmission unit (irradiation side control unit 11) that transmits information on the timing at which the irradiation of radiation is started to a predetermined external device Thereby, based on the information on the timing at which the irradiation of radiation is started, the exposed image data can be specified.

[0096] In the radiation imaging apparatus, the radiation imaging apparatus that is communicatively connected to the radiation irradiation apparatus includes a first specifying unit (imaging side control unit 21) that specifies, among the generated dynamic image data, the exposed image data generated in a state where radiation is irradiated based on the information on the timing at which the irradiation of radiation is started. Therefore, in the radiation imaging apparatus, by specifying the exposed image data, it is possible to delete the unexposed image data and the like.

[0097] The radiation imaging apparatus further includes a first notification unit that notifies by any one of light, sound, and vibration, a first specification determination unit (imaging side control unit 21) that determines whether the exposed image data can be specified by the first specification unit, and a first notification control unit (imaging side control unit 21) that causes the first notification unit to notify based on the determination result by the first specification determination unit. Therefore, when the imaging-side control unit 21 cannot identify the exposed image data, it is possible to prompt the user to check the image and delete the unexposed image by notifying the user.

[0098] Further, the radiation imaging apparatus includes a second transmission unit (imaging-side control unit 21) that transmits the determination result by the first determination unit to a predetermined external device. Therefore, when the imaging-side control unit 21 cannot identify the exposed image data, it can notify the external device to that effect and prompt the user to check the image and delete the unexposed image.

[0099] Further, the radiation imaging apparatus is wirelessly communication-connected to a radiation irradiation device (irradiation device 1) that controls sequential irradiation of radiation to a subject, and is a radiation imaging device (imaging device 2) that generates dynamic image data. The radiation imaging apparatus includes a second determination unit (imaging-side control unit 21) that determines whether information on the timing when the radiation irradiation device started radiation irradiation is received within a predetermined period, and a third transmission unit (imaging-side control unit 21) that, when it is determined by the second determination unit that the information on the timing when the radiation irradiation started is received within the predetermined period, transmits the dynamic image data generated after the timing when the radiation irradiation started to a predetermined external device, and when it is determined that the information on the timing when the radiation irradiation started is not received within the predetermined period, transmits the dynamic image data generated after the timing when the generation of the dynamic image data started, and information indicating that the unexposed image data is included in the dynamic image data to the predetermined external device. Therefore, when the imaging-side control unit 21 cannot obtain the information on the timing when the radiation irradiation started and cannot identify the exposed image data, the exposed image data can be identified in a predetermined external device such as a console.

[0100] Further, the radiation imaging apparatus can be stored in a mobile cart and is portable. Therefore, imaging can be performed without using a communication cable.

[0101] Also, in a console 5 communicatively connected to a radiation irradiation device, a second specifying unit (console 5) is provided that specifies exposure image data generated in a state irradiated with radiation from among the dynamic image data transmitted from a radiation imaging device based on an increase or decrease or a shape of signal values in the dynamic image data. Therefore, in the console 5, by specifying the exposure image data, it is possible to perform deletion or the like of unexposed image data.

[0102] Further, the console 5 includes a second notification unit that notifies by any one of light, sound, and vibration, a second specifying determination unit (console 5) that determines whether or not the exposure image data can be specified by the second specifying unit, and a second notification control unit (console 5) that controls the second notification unit to notify based on a determination result by the second specifying determination unit. Therefore, when the console 5 cannot specify the exposure image data, by notifying the user, it is possible to prompt the user to check the image and delete the unexposed image.

[0103] Also, in the console 5, the second notification control unit controls the second notification unit to notify based on a determination result transmitted from the radiation imaging device that determines whether or not the exposure image data can be specified in the radiation imaging device. Therefore, when the imaging device 2 cannot specify the exposure image data, by notifying the user, it is possible to prompt the user to check the image and delete the unexposed image.

[0104] Note that the description in the present embodiment is an example of a suitable radiation imaging system according to the present invention and is not limited thereto.

[0105] For example, in the dynamic imaging process of the above embodiment, although the imaging side control unit 21 was assumed to transmit the image data generated at n2 to n3 to the console 5, this is not the only case. Information indicating that the image data generated at n2 to n3 is exposed image data is associated with the image data, and information indicating that the image data generated before n2 and the image data generated after n3 is unexposed image data is associated therewith, and then the data is transmitted to the console 5. Then, at the console 5, only the image data associated with the information indicating that it is exposed image data may be displayed. Also, a configuration may be provided that enables switching between these operations.

[0106] Also, in the dynamic imaging process of the above embodiment and the modified example, although the radiation imaging system 100 in which the radiation irradiation device and the radiation imaging device are wirelessly communication-connected was used, this is not the only case. Even in a radiation imaging system in which the radiation irradiation device and the radiation imaging device are wired communication-connected by a cable or the like, the processes of the above embodiment and the modified example can be executed, and dynamic imaging for generating a plurality of frame images can be more preferably performed.

[0107] In addition, regarding the detailed configurations and detailed operations of each device constituting the radiation imaging system 100, they can be appropriately changed within a range not departing from the spirit of the present invention.

Explanation of Reference Numerals

[0108] 100 Radiation imaging system 1 Radiation irradiation device 1a Radiation control device 11 Irradiation side control unit (signal generation unit, determination unit, first transmission unit) 11a Irradiation side oscillator 12 High voltage generation unit 13 Storage unit 14 Irradiation side interface unit 1b Tube 2 Radiation imaging device 21 Imaging side control unit (first specifying unit, second determination unit, first specifying determination unit, first notification control unit, second transmission unit, third transmission unit) 21a Imaging side oscillator 22 Radiation detection unit 23 Readout unit 24 Memory unit 25 Imaging-side interface unit 3 Communication cable 100A Follow-up imaging system 1A Follow-up vehicle 5 Console (second specifying unit, second specifying determination unit, second notification control unit) 6 Control panel 6a Exposure switch 7 Storage unit 8 Charging unit 9 Access point R Radiation

Claims

1. A radiation irradiation device that is wirelessly communication-connected to a radiation imaging device that generates dynamic image data and performs control for sequentially irradiating a subject with radiation, a signal generation unit that generates a first pulse signal emitted by the radiation imaging device, a second pulse signal synchronized with a first count value obtained by counting up the first pulse signal, and a second count value obtained by counting up the second pulse signal; a first determination unit that determines whether to start radiation irradiation based on a delay time that is the difference between a first timing count value indicating the transmission timing of an irradiation permission signal for permitting the radiation irradiation device to irradiate radiation wirelessly transmitted from the radiation imaging device and a second timing count value indicating the timing at which the irradiation permission signal is received; A radiation irradiation device comprising the above.

2. The radiation irradiation device according to claim 1, wherein the first determination unit determines to start radiation irradiation when the second timing count value is less than or equal to a value obtained by adding a third timing count value corresponding to an upper limit time from when the radiation imaging device starts generating the dynamic image data to when the radiation irradiation device irradiates radiation to the first timing count value.

3. The radiation irradiation device according to claim 1 or 2, wherein the first determination unit determines which of a fourth timing count value indicating the timing at which the radiation imaging device starts generating the dynamic image data wirelessly transmitted from the radiation imaging device and the second timing count value is larger, and when the fourth timing count value is larger than the second timing count value, determines to start radiation irradiation when the second count value reaches the fourth timing count value.

4. The radiation irradiation device according to any one of claims 1 to 3, further comprising a first transmission unit that transmits information on the timing at which radiation irradiation is started to a predetermined external device.

5. In a radiation imaging device that is communicatively connected to the radiation irradiation device according to claim 4, a radiation imaging device comprising a first specifying unit that specifies exposure image data generated in a state where radiation is irradiated among the generated dynamic image data based on information on the timing at which the radiation irradiation is started.

6. a first notification unit that notifies by any one of light, sound, and vibration; a first specification determination unit that determines whether the exposure image data can be specified by the first specifying unit; The radiographic apparatus according to claim 5, comprising: a first notification control unit that notifies by the first notification unit based on a determination result by the first specific determination unit.

7. The radiographic apparatus according to claim 6, comprising: a second transmission unit that transmits a determination result by the first specific determination unit to a predetermined external device.

8. A radiographic apparatus that is wirelessly communication-connected to a radiation irradiation apparatus that controls sequential irradiation of radiation to a subject and generates dynamic image data, a second determination unit that determines whether information on the timing when the radiation irradiation apparatus started radiation irradiation is received within a predetermined period; a third transmission unit that, when it is determined by the second determination unit that information on the timing when the radiation irradiation started is received within the predetermined period, transmits the dynamic image data generated after the timing when the radiation irradiation started to a predetermined external device, and when it is determined that the information on the timing when the radiation irradiation started is not received within the predetermined period, transmits the dynamic image data generated after the timing when the generation of the dynamic image data started and information including unexposed image data in the dynamic image data to a predetermined external device.

9. The radiographic apparatus according to any one of claims 5 to 8, which can be stored in a mobile cart and is portable.

10. In a console communicatively connected to a radiation irradiation apparatus according to any one of claims 1 to 4, a second specifying unit that specifies, based on an increase or decrease or shape of signal values in the dynamic image data transmitted from the radiographic apparatus, the exposed image data generated in a state where radiation is irradiated among the dynamic image data.

11. a second notification unit that notifies by any one of light, sound, and vibration; a second specific determination unit that determines whether the exposed image data can be specified by the second specifying unit; The console according to claim 10, comprising: a second notification control unit that notifies by the second notification unit based on a determination result by the second specific determination unit.

12. The console according to claim 11, wherein the second notification control unit notifies by the second notification unit based on a determination result on whether the radiographic apparatus can specify exposed image data, which is transmitted from the radiographic apparatus.

13. A computer of a radiation irradiation device that is wirelessly communication-connected to a radiation imaging device that generates dynamic image data and performs control for sequentially irradiating a subject with radiation, A signal generation unit that generates a first pulse signal emitted by the radiation imaging device, a second pulse signal synchronized with a first count value obtained by counting up the first pulse signal, and a second count value obtained by counting up the second pulse signal, A first determination unit that determines whether to start radiation irradiation based on a delay time that is a difference between a first timing count value indicating the transmission timing of an irradiation permission signal that permits the radiation irradiation device to irradiate radiation wirelessly transmitted from the radiation imaging device and a second timing count value indicating the timing at which the irradiation permission signal is received, A program that functions as.

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