Radiography 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 is Shooting System Regarding. [Background technology]

[0002] Conventionally, a radiography system equipped with a radiation irradiation device that generates radiation and a radiography device that generates image data of a radiation image based on the received radiation is used to analyze the dynamic behavior (kinetics) of a subject through dynamic imaging, in which a subject is continuously photographed at regular intervals to obtain multiple frame images, and make a diagnosis. In dynamic radiography, a delay may occur between the timing at which a signal instructing radiation exposure is input to the radiation irradiation device and the timing at which radiation exposure is started from the radiation irradiation device in response to that signal (radiation exposure start delay time). Also, a delay may occur between the timing at which a signal instructing radiation exposure to be stopped is input to the radiation irradiation device and the timing at which radiation exposure from the radiation irradiation device is stopped in response to that signal (radiation exposure stop delay time). These delay times may affect the image quality of the captured image.

[0003] In this regard, Patent Document 1 describes a control device that measures an X-ray exposure start delay time from when a signal indicating X-ray exposure is input until X-rays are actually exposed, and an X-ray exposure stop delay time from when a signal indicating X-ray exposure stop is input until X-ray exposure actually stops, and controls X-ray exposure based on these delay times. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5597055 Summary of the Invention [Problem to be solved by the invention]

[0005] In a radiation imaging system in which a radiation irradiator and a radiation imaging apparatus are connected via wireless communication and operate in synchronization with each other, an exposure permission notification delay time may occur from the time the radiation imaging apparatus starts generating an image to the time the radiation irradiator starts irradiating radiation, and an exposure stop notification delay time may occur from the time the radiation irradiator stops irradiating radiation to the time the radiation imaging apparatus stops generating an image. The exposure permission notification delay time and the exposure stop notification delay time may become unstable depending on the communication environment because the radiation irradiator and the radiation imaging apparatus are connected via wireless communication. In particular, if the exposure permission notification delay time is long, there are cases where dynamic imaging cannot be performed for the planned number of frames, and dynamic imaging cannot be performed appropriately. The control device described in Patent Document 1 does not provide any description about the exposure permission notification delay time and the exposure stop notification delay time, and therefore cannot solve the above-mentioned problem.

[0006] The present invention has been made in consideration of the above-mentioned problems, and aims to more suitably perform dynamic imaging that generates multiple frame images even when a radiation irradiation device that generates radiation and a radiation imaging device that generates radiographic images are connected via wireless communication. [Means for solving the problem]

[0007] In order to solve the above problem, the radiation of the invention described in claim 1 Shooting System teeth, a radiographic imaging device that generates dynamic image data; 、 the radiation imaging device; A radiation irradiation device that is connected by wireless communication and controls the sequential irradiation of radiation onto a subject. and, A radiography system comprising: And, a signal generating 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 timing count value indicating a timing at which an irradiation permission signal is transmitted wirelessly from the radiation imaging apparatus to permit the radiation irradiation apparatus to irradiate radiation; The radiation irradiation device This is the difference between the first and second timing count values, which indicate the timing of the received signal. No. 1 Delay time a second delay time that is the difference between a count value indicating the timing of transmission of an irradiation end signal wirelessly transmitted from the radiation irradiation device at which the radiation irradiation device ends irradiation of radiation, and a count value indicating the timing of reception of the irradiation end signal by the radiation imaging device; Based on Identifying exposure image data generated under irradiation of radiation from among the generated dynamic image data. No. 1 identification Department and Equipped with.

[0008] The invention described in claim 2 is the radiation described in claim 1. Shooting System In The dynamic image data has an upper limit on the number of images that can be captured, When the dynamic image data generated by the radiation imaging apparatus reaches the imaging upper limit number, the first specifying unit does not use the second delay time to specify the exposure image data.

[0012] Also, claims 3 The invention described in claim 1 Radiography according to system In a first notification unit that notifies by light, sound, or vibration; a first identification determination unit that determines whether the exposure image data has been identified by the first identification unit; and a first notification control unit that issues a notification by the first notification unit based on the determination result by the first identification determination unit.

[0015] Also, claims 4 The invention described in claim 1 Radiography according to system teeth, It can be stored in a medical cart and is portable. [Effects 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 radiographic image are connected via wireless communication, dynamic imaging that generates multiple frame images can be more suitably performed. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a block diagram showing a schematic configuration of a radiation imaging system according to an embodiment of the present invention. [Figure 2] 2 is a block diagram showing a specific configuration of a radiation irradiation device included in the radiation imaging system of FIG. 1. FIG. [Figure 3] 2 is a block diagram showing a specific configuration of a radiation imaging apparatus included in the radiation imaging system of FIG. 1. FIG. [Figure 4] FIG. 2 is a block diagram showing an example of a mobile radiography system configured using the radiography system of FIG. 1. [Figure 5] FIG. 1 is a diagram showing an example of dynamic imaging in a mobile imaging system. [Figure 6] 10 is a flowchart showing a synchronization process. [Figure 7] 10 is a flowchart showing a dynamic photography process. [Figure 8] 10 is a flowchart showing dynamic imaging processing according to the first modification. [Figure 9] 10 is a flowchart showing dynamic imaging processing according to Modification 2. [Figure 10] 13 is a flowchart showing dynamic imaging processing in Modification 3. [Figure 11] 13 is a flowchart showing dynamic imaging processing in Modification 4. [Figure 12] 13 is a flowchart showing dynamic imaging processing according to Modification 5. [Figure 13] 13 is a flowchart showing dynamic imaging processing in Modification 6. DETAILED DESCRIPTION OF THE INVENTION

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

[0023] <1. Radiography System> First, an outline of the radiation imaging system of this embodiment (hereinafter referred to as imaging system 100) will be described.

[0024] [1-1. Outline of the Radiography System] As shown in FIG. 1, the imaging system 100 of this embodiment is configured to include a radiation irradiation device (hereinafter referred to as irradiation device 1), one or more radiation imaging devices (hereinafter referred to as imaging device 2), and an external interface (hereinafter referred to as external IF).

[0025] (Radiation irradiation device) The irradiation device 1 generates radiation R (e.g., X-rays) and irradiates the radiation R onto the subject and the imaging device 2 placed behind it, and is configured with a radiation control device (hereinafter referred to as control device 1a) and a tube 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 radiation R from the irradiation device 1, and is capable of communicating with the irradiation device 1. The specific configuration of this photographing device 2 will also be described later.

[0027] (external interface) The external IF connects, for example, the irradiation device 1 and the imaging device 2 so that they can communicate with each other. The external IF is composed of, for example, a communication cable 3, a cradle into which the imaging device 2 is inserted, a storage section 7 of the medical cart that stores the imaging device 2 (described later), and the like. Furthermore, the external IF can be disconnected (for example, removed) from at least one of the irradiation device 1 and the imaging device 2 as needed.

[0028] [1-2. Outline of operation of the radiography system] The imaging system 100 of this embodiment configured as described above is capable of imaging a subject by irradiating radiation R from the irradiation device 1 to the subject positioned between the irradiation device 1 and the imaging device 2. Furthermore, the imaging system 100 according to this embodiment is capable of capturing moving images (hereinafter referred to as dynamic imaging). That is, based on a single imaging operation (pressing the exposure switch 6a, which will be described later), the irradiation device 1 can generate pulsed radiation R of a preset time width multiple times in succession at regular intervals, and the imaging device 2 can generate multiple frame images that constitute a moving image. Dynamic imaging includes capturing moving images, but does not include capturing still images while displaying the moving image. A series of images obtained by dynamic imaging is called dynamic images. Dynamic images include moving images, but do not include images obtained by capturing still images while displaying the moving image.

[0029] Furthermore, the imaging system 100 can be configured to be able to communicate with other systems such as a Radiology Information System (RIS) and a Picture Archiving and Communication System (PACS), as well as with an analysis device.

[0030] <2. Radiation irradiation device> Next, there will be described details of the control device 1a provided in the irradiation device 1. Fig. 2 is a block diagram showing a 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 includes an irradiation-side control unit 11, a high-voltage generating unit 12, a storage unit 13, an irradiation-side interface unit (hereinafter referred to as an irradiation-side IF unit 14), and the like. Furthermore, each of the units 11 to 14 of the control device 1a can be supplied with power via a power cable or built-in power source (not shown).

[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 the units 12 to 14 of the irradiation device 1. The irradiation-side control unit 11 also includes an oscillator (hereinafter referred to as irradiation-side oscillator 11a). The irradiation-side oscillator 11a can be configured with a crystal oscillator, a ceramic oscillator, or the like that generates a clock with a predetermined cycle when the power is turned on. The irradiation-side control unit 11 has a function of periodically generating timing information using a 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 or the like that is output each time one or more clocks are generated. The time information refers to a count value (second count value) that counts up the second pulse signal, or the like. Furthermore, each of the components 11 to 14 of the irradiation device 1 operates based on a clock generated by the irradiation-side oscillator 11a. Furthermore, the irradiation-side oscillator 11a may use a plurality of oscillators depending on the purpose, such as the required accuracy.

[0033] Furthermore, the irradiation side control unit 11 executes a synchronization process, which will be described later, to synchronize the timing signal and count value with those of the imaging device 2. That is, the irradiation side control unit 11 generates a first pulse signal (described later) emitted by the radiation imaging device (imaging device 2), a second pulse signal synchronized with a 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. The irradiation side control unit 11 also executes a dynamic imaging process described below to determine whether to start irradiation of radiation based on a delay time that is the difference between a first timing count value indicating the timing of transmission of an irradiation permission signal that is wirelessly transmitted from the radiation imaging device (imaging device 2) to permit the radiation irradiation device (irradiation device 1) to irradiate radiation, and a second timing count value indicating the timing of reception of the irradiation permission signal. At this time, the irradiation side control unit 11 functions as a first determination unit. The irradiation side control unit 11 also executes a dynamic imaging process (described later) to transmit information on the timing at which radiation irradiation started to a predetermined external device. At this time, the irradiation side control unit 11 functions as a first transmission unit.

[0034] Upon receiving a timing signal from the irradiation side control unit 11, the high voltage generating unit 12 applies a voltage to the tube 1b according to the preset imaging conditions (for example, imaging mode (still image imaging, dynamic imaging), imaging target area, conditions related to the subject such as physique, and conditions related to the irradiation of radiation R such as tube voltage, tube current, irradiation time, current-time product). The shooting mode included in the shooting conditions is information about the shooting method, such as still image shooting, dynamic image shooting, etc. The shooting mode of the shooting system 100 can be set in advance, and the high voltage generating unit 12 performs an operation appropriate to the shooting mode according to the shooting mode setting. When dynamic imaging is included in the imaging conditions, a pulsed voltage is repeatedly applied at predetermined intervals each time a timing signal is received. When a voltage is applied from high voltage generating unit 12, tube 1b generates radiation R with a dose corresponding to the applied voltage. Specifically, when a pulsed voltage is applied from high voltage generating unit 12, pulsed radiation R is irradiated.

[0035] The storage unit 13 is configured by an HDD (Hard Disk Drive), a semiconductor memory, etc., and stores various processing programs, as well as parameters, files, etc. required for executing the processing programs. The storage unit 13 is also capable of storing various data (for example, timing information) generated during the process 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 types of information (signals and data). Specifically, it can be configured with a connector into which the communication cable 3 is inserted.

[0037] [2-2. Specific operation of the radiation irradiation device] The irradiation-side control section 11 of the irradiation device 1 configured as above operates as follows in accordance with the program stored in the storage section 13. For example, the irradiation side control unit 11 sets various imaging conditions (conditions related to the subject, such as imaging mode (still image imaging, dynamic imaging), imaging target area, and physique, and conditions related to the irradiation of radiation R, such as tube voltage, tube current, irradiation time, current-time product, and frame rate). Furthermore, based on receiving the irradiation permission signal, the irradiation side control unit 11 controls the high voltage generating unit 12 to start exposure (irradiation of radiation). When dynamic imaging is included in the imaging conditions, exposure is performed at a cycle according to the frame rate.

[0038] <3. Configuration of the Radiography Device> Next, a description will be given of a specific configuration of the photographing device 2 provided in the photographing system 100. FIG.

[0039] 3-1. Specific Configuration of Radiography Device The imaging device 2 according to this embodiment includes a housing (not shown), as well as an imaging-side control unit 21, a radiation detection unit 22, a readout unit 23, a memory unit 24, an imaging-side interface unit (hereinafter referred to as an imaging-side IF unit 25), etc., as shown in FIG. Furthermore, each of the components 21 to 25 of the imaging device 2 can be supplied with power via a power cable or built-in power source (not shown).

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

[0041] Furthermore, the imaging side control unit 21 executes a dynamic imaging process (described later) to identify, from the generated dynamic image data, the exposure image data that was generated in a state where radiation was irradiated, based on information on the timing at which radiation irradiation started. At this time, the imaging side control unit 21 functions as a first identification unit.

[0042] The radiation detection unit 22 may be any one having a substrate on which a plurality of pixels are arranged two-dimensionally, each pixel having a radiation detection element that directly or indirectly generates an electric charge corresponding to the dose of radiation R received from the outside, and a switch element that is provided between each radiation detection element and wiring and can be switched between an on state that allows current to flow between the radiation detection element and the wiring and an off state that prevents current from flowing, and any conventionally known type may be used. That is, the imaging device 2 may be a so-called indirect type that is equipped with a scintillator and detects the light emitted by the scintillator when it receives radiation R, or it may be a so-called direct type that directly detects radiation R without going through a scintillator or the like.

[0043] The readout unit 23 may be configured to read out signal values ​​corresponding to the amount of charge accumulated in each of the multiple radiation detection elements (generated by the radiation detection elements) and generate image data of the radiation image based on each signal value, and any conventionally known readout unit may be used.

[0044] The storage unit 24 is configured with a HDD, a semiconductor memory, etc., and stores various processing programs including various image processing programs, parameters and files required for executing the programs, etc. The storage unit 24 is also capable of storing various data (for example, timing information) generated during the process 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 types of information (signals and data). Specifically, it can be configured with a connector into which the communication cable 3 is inserted.

[0046] When the photographing device 2 is configured to receive power from a built-in power supply, the built-in power supply may be a lithium ion capacitor (LiC), a lithium ion battery (LiB), or other power sources. Lithium ion capacitors can be charged quickly and do not ignite, so after completing an imaging session (for example, during a medical round), the next imaging session can be performed in a short time. On the other hand, lithium ion batteries are inexpensive and have a large capacity, so the manufacturing cost of the imaging device 2 is low. This can lower the battery cost and reduce the number of times it needs to be charged. Either configuration is preferable for taking multiple shots.

[0047] [3-2. Specific operation of the radiography device] The photographing-side control unit 21 of the photographing device 2 configured as above operates as follows in accordance with the program stored in the storage unit 24. For example, the photographing-side control unit 21 has a function of switching the state of the photographing device 2 to one of the "initialization state," "storage state," and "reading and transferring state."

[0048] The "initialized state" is a state in which an on voltage is applied to each switch element and the charge generated by the radiation detection element is not accumulated in each pixel (the charge is released to the signal line). The "accumulation state" is a state in which an off voltage is applied to each switch element, and charges generated by the radiation detection element can be accumulated in the pixel (charges are not released to the signal line). The "reading and transferring state" is a state in which an on voltage is applied to each switch element, the reading unit 23 is driven, and a signal value based on the charge that has flowed in can be read out.

[0049] It should be noted that the repetition of the initialization operation before dynamic imaging consumes a lot of power. Therefore, the photographing device 2 may be configured to start repeating the operation of returning to the initialization state before dynamic photographing when a specified operation is performed by the user, or may be configured to set a wait time equivalent to the workflow and automatically start the operation after the wait time has elapsed. In this way, power consumption can be reduced in a series of workflows.

[0050] <4. Mobile radiography system> Next, a mobile radiography system 100A will be described in detail, which is configured using the above-described radiography system 100. Fig. 4 is a block diagram showing an example of the mobile radiography system 100A.

[0051] [4-1. Background] When performing imaging using an imaging stand installed in a hospital imaging room, a communication cable and a power cable can be connected to the imaging device 2 installed on the imaging stand, allowing for sending and receiving information between the irradiation device 1 and supplying power to the imaging device 2, etc. For example, when a communication cable is used to connect to the imaging device 2, by including a pulse signal or timing signal in the control signal of the communication cable, it becomes possible to synchronize the timing of the irradiation device 1 and the imaging device 2 for imaging. However, even when taking photographs in a radiography room, there are cases where the patient must be in a wheelchair or bed. In such cases, if the radiography device 2 is left connected to a communication cable, Communication cables get in the way There is a risk that the communication cable may come loose, causing communication to become impossible. - The communication cable comes into contact with the subject, which is a hygiene issue. Due to these problems, there was a demand for a way to shoot images without using communication cables.

[0052] On the other hand, when imaging is performed while moving using the mobile imaging system 100A, imaging is performed in the hospital ward where the subject is recuperating. In this case, imaging is performed on the bed where the subject is lying, and it is necessary to remove the imaging device 2 from the storage unit 7 and insert the imaging device 2 between the subject and the bed to perform imaging. In this case, there are problems more than when imaging is performed in the imaging room, such as the communication cable getting in the way, the risk of the communication cable becoming unplugged and causing communication failure, and hygiene issues as the communication cable comes into contact with the subject, and there has been a demand for imaging without using a communication cable. In particular, when taking images using CR (Computed Radiography), a communication cable was not required during the image taking process, so there was a demand for an image taking process using the imaging device 2 that does not require a communication cable in order to achieve the same ease of operation as with CR.

[0053] Therefore, the imaging system 100 of this embodiment configured as described above can also be used as a mobile imaging system 100A (of course, it can also be installed in an imaging room or the like in a hospital).

[0054] [4-2. Specific configuration of the mobile radiography system] As shown in FIG. 4, the mobile radiography system 100A is composed of a medical examination cart 1A and the above-mentioned radiography device 2 (illustration of the tube 1b is omitted in FIG. 4).

[0055] In addition to the control device 1a, the medical cart 1A is equipped with a console 5, an operation panel 6, a storage section 7, a charging section 8, an access point 9, and wheels (not shown), and is configured to be movable.

[0056] The console 5 is capable of setting the imaging conditions (imaging mode (still image capture, dynamic image capture), tube voltage, tube current and irradiation time or current-time product (mAs value), imaging area, imaging direction, etc.) for at least one of the control device 1a and the imaging device 2 based on an imaging order obtained from another system (HIS, RIS, etc.) or an operation performed on the operation panel 6 by a user (e.g., a radiologist). The console 5 is also capable of acquiring image data of the radiation image generated by the imaging device 2, storing the image data therein, and transmitting the image data to other devices (PACS, dynamic analysis device, etc.).

[0057] Furthermore, the console 5 executes a dynamic imaging process, which will be described later, to identify, from the dynamic image data transmitted from the radiation imaging device (imaging device 2), exposure image data that was generated under irradiation with radiation, based on the increase / decrease in signal values ​​or shape in the dynamic image data. At this time, the console 5 functions as a second identification unit.

[0058] The control panel 6 is equipped with an exposure switch 6a. When the exposure switch 6a is pressed, the console 5 transmits an imaging start signal to the control device 1a. That is, pressing the exposure switch 6a is an exposure start operation. When the exposure switch 6a is released, the console 5 transmits an imaging stop signal to the control device 1a. That is, releasing the exposure switch 6a is an exposure stop operation.

[0059] The storage section 7 is configured to be able to store the imaging device 2 therein. The storage section 7 also has an external IF that is connected to the imaging-side IF unit 25 when the photographing device 2 is stored. Specifically, the tip of the communication cable 3 is attached to a position inside the storage section 7 that faces the imaging-side IF unit 25.

[0060] The charging section 8 is for charging the built-in power source of the photographing device 2. The charging unit 8 may be charged by receiving power from an external power source (e.g., a hospital outlet), by receiving power from a power source provided in the medical cart 1A, or by using its own power source.

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

[0062] <5. Dynamic radiography using a mobile radiography system> [5-1. Dynamic Shooting Operation] Next, the dynamic radiography operation performed by the mobile radiography system 100A shown in FIG. 5 will be described. First, in the mobile radiography system 100A, when a user presses the exposure switch 6a, which is an exposure start operation, an exposure permission request is sent from the control device 1a to the radiography device 2, and image data generation is started in the radiography device 2. The timing at this time is defined as T1. Next, an exposure permission notification, which is an irradiation permission signal, is transmitted from the imaging device 2 to the control device 1a, and the control device 1a starts exposure. The timing at which this happens is designated as T2. Here, T1 to T2 are defined as an exposure permission notification delay time. During this exposure permission notification delay time, unexposed image data is generated, which is image data generated in a state where exposure is not being performed. Thereafter, if the user releases the exposure switch 6a, which is an exposure stop operation, before taking all the photographs that can be taken, the control device 1a stops the exposure and transmits an exposure stop notification, which is an irradiation stop signal, to the imaging device 2. The timing at which this happens is designated as T3. Next, the imaging device 2 stops generating image data based on the received exposure stop notification, at timing T4. Here, T3 to T4 is the exposure stop notification delay time, during which unexposed image data is generated.

[0063] The number of image data that can be generated in the mobile radiography system 100A is limited by design constraints such as the storage area of ​​the storage unit 24 of the radiography device 2 and the influence of noise over time. If the number of image data that can be generated reaches the limit and exposure is performed in a state where image data cannot be generated, unnecessary radiation exposure will occur. Therefore, in order to prevent unnecessary radiation exposure, the total number of images that can be captured and the number of unexposed image data generated during the exposure permission notification delay time must be equal to or less than the upper limit number of images, which is the upper limit on the number of image data that can be generated due to design constraints. Furthermore, as diagnostic images to be used for diagnosis, it is necessary to acquire only the exposure image data generated while exposure is being performed, and in a dynamic analysis device that analyzes dynamic images, it is also necessary to acquire only the exposure image data in order to correctly analyze the dynamic images, so it is necessary to identify the exposure image data from the image data generated by the imaging device 2. In order to meet the above requirements, the mobile radiography system 100A executes the processes shown in FIGS. 6 to 13. FIG.

[0064] [5-2. Synchronization processing] First, the user performs an action 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, turning on the power of each device in the mobile imaging system 100A). Then, the irradiation-side control unit 11 and the imaging-side control unit 21 each start timing. If the timings at which the power of each device is turned on differ, the timing at which the irradiation-side control unit 11 starts timing and the timing at which the imaging-side control unit 21 starts timing will also differ, and the timing at which the control device 1a generates timing information and the timing at which the imaging device 2 generates timing information will differ at this stage.

[0065] Here, when the photographing device 2 is stored in the storage section 7 and the irradiation side IF section 14 of the control device 1a is connected to the photographing side IF section 25 of the photographing device 2, the synchronization process shown in Figure 6 is started in the control device 1a, the photographing device 2, and the console 5.

[0066] In the synchronization process, first, the console 5 transmits a timing information synchronization instruction to the image capturing device 2 (step A1). Next, upon receiving the timing information synchronization instruction, the imaging side control unit 21 transmits a timing information synchronization start request to the control device 1a (step A2). Next, upon receiving the timing information synchronization start request, the irradiation side control unit 11 initializes the count value, which is the time information, and transmits the generated timing information to the image capturing apparatus 2 (step A3). Next, the photographing 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, based on the timing signal transmitted from the control device 1a, the photographing side control unit 21 generates a copy signal whose rising timing is equal to that of the timing signal, and also synchronizes the count value. The copy signal may start from the timing of the falling edge, and may include an error within the required accuracy. That is, the illumination-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 notification of completion of synchronization of the timing information and ends the process.

[0067] Thereafter, when the user releases the connection between the irradiation-side IF unit 14 and the photographing-side IF unit 25 (moves the photographing device 2 to the photographing position), the photographing device 2 starts measuring time independently. At this time, the time measurement information of the control device 1a and the photographing device 2 is synchronized.

[0068] [5-3. Dynamic Shooting Processing] Next, a description will be given of the dynamic radiography process shown in Fig. 7, which is executed by the control device 1a, the radiography device 2, and the console 5. In the mobile radiography system 100A in a state where the timing information of the control device 1a and the radiography device 2 is synchronized, when the user presses the exposure switch 6a, the dynamic radiography process is executed.

[0069] In the dynamic imaging process, first, the console 5 transmits an imaging start signal to the control device 1a (step B1). Next, the irradiation side control unit 11, which has received the imaging 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 adds a count value m (third timing count value) corresponding to the upper limit of the exposure permission notification delay time to the count value n1 (first timing count value) at the start of image data generation, and transmits the information N1 (=n1+m) to the control device 1a together with the exposure permission notification (step B3). The upper limit of the exposure permission notification delay time is set in advance based on the upper limit number of imaging sessions and the number of images that can be captured. Next, the irradiation side controller 11, which 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). If n2 is equal to or smaller than N1 (step B4; YES), the irradiation side control unit 11 controls the high voltage generating unit 12 to start exposure (step B5). If n2 is larger than N1 (step B4; NO), the irradiation side control unit 11 does not permit 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 is equal to or less than the count value m corresponding to the upper limit of the exposure permission notification delay time. In other words, the total number of possible images to be captured and the number of image data generated during the exposure permission notification delay time is equal to or less than the upper limit of the number of images to be captured, thereby preventing unnecessary exposure.

[0070] After step B5, the irradiation side control unit 11 transmits information n2 as information on the timing at which radiation irradiation started to the imaging device 2 (step B7). Next, the imaging side control unit 21, which 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 or not the exposure switch 6a has been released by the user before the number of images that can be captured is exhausted (step B9). If the exposure switch 6a is not released (step B9; NO), the console 5 shifts the process to step B9. If the exposure switch 6a is released (step B9; YES), the console 5 transmits an imaging stop signal to the control device 1a (step B10). Next, upon receiving the imaging stop signal, the irradiation side control unit 11 controls the high voltage generating unit 12 to stop the exposure (step B11). Next, the irradiation side control unit 11 transmits information on the count value n3 at the time of stopping the exposure together with the exposure stop notification to the imaging device 2 (step B12). Upon receiving the exposure stop notification and the information of n3, the imaging side control unit 21 ends the generation of 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 identifies the image data generated from n2 to n3 as exposure image data.

[0071] (Variation 1) Next, a first modification of the above embodiment will be described. 8 is a flowchart showing the dynamic imaging process of this modified example. The following mainly describes the differences from the above embodiment. The configuration of the mobile imaging system 100A of this modified example is the same as that of the mobile imaging system 100A of the above embodiment.

[0072] In the dynamic imaging process of this modified example shown in FIG. 8, first, the console 5 performs step C1, which is the same as step B1 in the dynamic imaging process of the above embodiment. Next, the irradiation side control unit 11 performs step C2, which is the same as step B2 of the dynamic imaging process in the above embodiment. Next, 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 (fourth timing count value). The predetermined time may be set to an average value of the exposure permission notification delay time, or the like. Then, the imaging side control unit 21 transmits information about na and information about N2 (=na+m) obtained by adding na to a count value m corresponding to the upper limit of the exposure permission notification delay time, together with the exposure permission notification, to the control device 1a (step C3). Next, the irradiation side controller 11, which has received the information on na, the information on N2, and the exposure permission notification, determines whether or not n2, which is the count value at the time of receiving the exposure permission notification, is less than na (step C4). If n2 is less than na (step C4; YES), the irradiation-side control section 11 determines whether the count value has reached na (step C5). If the count value has not reached na (step C5; NO), the irradiation side control unit 11 shifts the process to step C5. That is, the irradiation side control unit 11 waits until the count value reaches na. When the count value reaches 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] If n2 is not less than na (step C4; NO), the irradiation-side control unit 11 determines whether n2 is equal to or less than N2 (step C8). If n2 is equal to or less than N2 (step C8; YES), the irradiation side control unit 11 proceeds to step C6. In this case, the irradiation side control unit 11 then transmits information about n2 as information about the timing at which radiation irradiation started to the imaging device 2. Thereafter, instead of step C7, the imaging side control unit 21, having received the information about n2, sequentially transmits image data generated after n2 to the console 5. If n2 is larger than N2 (step C8; NO), the irradiation side control unit 11 does not permit exposure (step C9), and ends this process.

[0074] After step C7, the console 5 performs steps C10 and C11, which are similar to steps B9 and B10 of the dynamic imaging process in 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, which is the same as step B13 in the dynamic imaging process of the above embodiment, and ends this process. Here, the photographing-side control unit 21 identifies the image data generated between na and n3 (when n2≦na) or between n2 and n3 (when n2>na) as exposure image data.

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

[0076] (Variation 2) Next, a second modification of the above embodiment will be described. 9 is a flowchart showing the dynamic imaging process of this modified example. The following mainly describes the differences from the above embodiment. The configuration of the mobile imaging system 100A of this modified example is the same as that of the mobile imaging system 100A of the above embodiment. In the dynamic photography process of this modified example, the exposure image data is specified by the console 5 after the image data generation is completed.

[0077] In the dynamic imaging process of this modified example shown in FIG. 9, first, the console 5 performs step D1, which is the same as step B1 in the dynamic imaging process of the above embodiment. Next, the irradiation side control unit 11 performs step D2, which is the same as step B2 of the dynamic imaging process in the above embodiment. Next, the imaging side control unit 21 starts generating image data. Then, the imaging side control unit 21 adds a count value m corresponding to the upper limit of the exposure permission notification delay time to the count value n1 at the start of image data generation, and transmits the information N1 (=n1+m) 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 D3). Next, the irradiation side control unit 11 performs steps D4 to D6, which are the same as steps B4 to B6 of the dynamic imaging process in the above embodiment. Next, the console 5 performs steps D7 and D8, which are similar to steps B9 and B10 of the dynamic imaging process in the above embodiment. Next, the irradiation side control unit 11 performs step D9, which is the same as step B11 of the dynamic imaging process in 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 count values ​​in 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 value in which the exposure was performed to the console 5 (step D13). Next, the console 5 identifies the exposure image data from the image data transmitted from the imaging device 2 based on the received range of count values ​​for which exposure was performed (step D14), and ends this process.

[0078] (Variation 3) Next, a third modification of the above embodiment will be described. 10 is a flowchart showing the dynamic imaging process of this modified example. The following description will focus on the differences from the above embodiment. The imaging device 2 of the mobile imaging system 100A of this modified 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 detected value of the radiation sensor. Furthermore, the photographing device 2 may identify unexposed image data and exposed image data according to an increase or decrease in the signal value read out by the readout unit 23. Furthermore, the photographing device 2 may identify unexposed image data and exposed image data according to the shape in the generated image data.

[0079] In the dynamic imaging process of this modified example shown in FIG. 10, first, the console 5 performs step E1, which is the same as step B1 in the dynamic imaging process of the above embodiment. Next, the irradiation side control unit 11 performs step E2, which is the same as step B2 of the dynamic imaging process in the above embodiment. Next, the imaging side control unit 21 starts generating image data. Then, the imaging side control unit 21 adds a count value m corresponding to the upper limit of the exposure permission notification delay time to the count value n1 at the start of image data generation, and transmits the information N1 (=n1+m) together with the exposure permission notification to the control device 1a. Then, the imaging side control unit 21 sequentially transmits the image data identified as exposure image data by the above-mentioned identification method from the generated image data to the console 5 (step E3). Next, the irradiation side control unit 11 performs steps E4 to E6, which are the same as steps B4 to B6 of the dynamic imaging process in the above embodiment. Next, the console 5 performs steps E7 and E8, which are similar to steps B9 and B10 of the dynamic imaging process in the above embodiment. Next, the irradiation side control unit 11 performs step E9, which is the same as step B11 of the dynamic imaging process in 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 terminates the generation of image data, and transmits the image data that has been identified as exposure image data by the above-mentioned identification method to the console 5 (step E11), thereby terminating this processing.

[0080] (Variation 4) Next, a fourth modification of the above embodiment will be described. 11 is a flowchart showing the dynamic imaging process of this modified example. The following mainly describes the differences from the above embodiment. The configuration of the mobile imaging system 100A of this modified example is the same as that of the mobile imaging system 100A of the above embodiment. In the dynamic photography process of this modified example, the console 5 sequentially identifies the exposure image data for the image data transmitted by the photography device 2.

[0081] In the dynamic imaging process of this modified example shown in FIG. 10, first, the console 5 performs step F1, which is the same as step B1 in the dynamic imaging process of the above embodiment. Next, the irradiation side control unit 11 performs step F2, which is the same as step B2 of the dynamic imaging process in the above embodiment. Next, the imaging side control unit 21 starts generating image data. Then, the imaging side control unit 21 adds a count value m corresponding to the upper limit of the exposure permission notification delay time to the count value n1 at the start of image data generation, and transmits the information N1 (=n1+m) 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 exposure image data from the transmitted image data based on the increase / decrease or shape of the signal value in the transmitted image data (step F4). Next, the irradiation side control unit 11 performs steps F5 to F7, which are similar to steps B4 to B6 of the dynamic imaging process in the above embodiment. Next, the console 5 performs steps F8 and F9, which are similar to steps B9 and B10 of the dynamic imaging process in the above embodiment. Next, the irradiation side control unit 11 performs step F10, which is the same as step B11 of the dynamic imaging process in 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 controller 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 from the transmitted image data based on the increase / decrease in the signal value or the shape in the transmitted image data (step F13), and ends this process.

[0082] (Variation 5) Next, a fifth modification of the above embodiment will be described. 12 is a flowchart showing the dynamic imaging process of this modified example. The following mainly describes the differences from the above embodiment. The configuration of the mobile imaging system 100A of this modified example is the same as that of the mobile imaging system 100A of the above embodiment. The dynamic imaging process of this modified example is a case where the number of images that can be captured is taken without the user releasing the exposure switch 6a before the number of images that can be captured is taken, as in the above embodiment.

[0083] In the dynamic imaging process of this modified example shown in FIG. 12, first, the console 5 performs step G1, which is the same as step B1 in the dynamic imaging process of the above embodiment. Next, the irradiation side control unit 11 performs step G2, which is the same as step B2 of the dynamic imaging process in the above embodiment. Next, the imaging side control unit 21 performs step G3, which is the same as step B3 of the dynamic imaging process in the above embodiment. Next, the irradiation side control unit 11 performs steps G4 to G7, which are the same as steps B4 to B7 of the dynamic imaging process in the above embodiment. Next, the imaging side control unit 21 performs step G8, which is the same as step B8 of the dynamic imaging process in the above embodiment. Next, the irradiation side control unit 11 determines whether the number of image data generated in the photographing device 2 after n2 has reached the number of images that can be photographed (step G9). If the number of images that can be captured has not been reached (step G9; NO), the irradiation side control unit 11 shifts the process to step G9. If the number of images that can be captured has been reached (step G9; YES), the irradiation side control unit 11 controls the high voltage generating unit 12 to stop the exposure (step G10).

[0084] After step G8, the photographing-side control unit 21 determines whether the number of pieces of image data generated in the photographing device 2 after n2 has reached the number of pieces of image data that can be photographed (step G11). If the number of images that can be captured has not been reached (step G11; NO), the image capturing side control unit 21 moves the process to step G11. If the number of images that can be captured has been reached (step G11; YES), the imaging side control unit 21 ends the generation of image data, transmits the generated image data to the console 5 (step G12), and ends this process. Here, the photographing-side control unit 21 identifies the image data generated after n2 as exposure image data. Since the timing information of the control device 1a and the imaging device 2 is synchronized, the exposure stop in step G10 of the dynamic imaging process of this modification and the end of image data generation in step G12 can be performed simultaneously, thereby preventing unexposed image data from being generated during the exposure stop notification delay time.

[0085] (Variation 6) Next, a sixth modification of the above embodiment will be described. 13 is a flowchart showing the dynamic imaging process of this modified example. The following description will focus on the differences from the above embodiment. The imaging device 2 of this modified example 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. Furthermore, the dynamic photography processing of this modified example corresponds to the case where communication between the control device 1a and the photographing device 2 becomes impossible after step B3 in the dynamic photography processing of the above embodiment shown in Figure 7 due to a communication failure between the control device 1a and the photographing device 2, and the case where the user takes all the possible photographs without releasing the exposure switch 6a before all the possible photographs are taken.

[0086] In the dynamic imaging process of this modified example shown in FIG. 13, first, the console 5 performs step H1, which is the same as step B1 in 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 in 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 in the above embodiment. Next, the irradiation side control unit 11 performs steps H4 to H7, which are similar to steps B4 to B7 of the dynamic imaging process in the above embodiment. Next, the irradiation side control unit 11 determines whether the number of image data generated in the photographing device 2 after n2 has reached the number of images that can be photographed (step H8). If the number of images that can be captured has not been reached (step H8; NO), the irradiation side control unit 11 shifts the process to step H8. If the number of images that can be captured has been reached (step H8; YES), the irradiation side control unit 11 controls the high voltage generating unit 12 to stop the exposure (step H9).

[0087] After step H3, the photographing-side control section 21 determines whether or not the information n2 has been received from the control device 1a (step H10). As shown in Figure 7, if communication is possible between the control device 1a and the photographing device 2 and the photographing side control unit 21 is able to receive information n2 (step H10; YES), the photographing side control unit 21 proceeds to step B8 of Figure 7, that is, it sequentially transmits image data generated after n2 to the console 5. If the information of n2 is not received (step H10; NO), the photographing-side control unit 21 determines whether the count value has reached N1 (step H11). If the count value has not reached N1 (step H11; NO), the imaging-side control unit 21 proceeds to step H10. That is, the imaging-side control unit 21 waits to receive information on n2 until the count value reaches N1. This is because there is a possibility that information on n2 will be transmitted to the imaging device 2 by the irradiation-side control unit 11 as information on the timing of starting irradiation of radiation by N1. Furthermore, when the count value reaches N1 (step H11; YES), the imaging side control unit 21 sequentially transmits the image data generated after n1 to the console 5 together with information that the image data generated after n1 includes unexposed image data (step H12). The reason that the image data generated after n1 includes unexposed image data is that the imaging side control unit 21 is unable to acquire the count value for which exposure was performed and is therefore unable to identify the exposed image data due to the loss of communication between the control device 1a and the imaging device 2. That is, in steps H10 and H11, the imaging-side control unit 21 determines whether information (n2) on the timing at which the radiation irradiation device (irradiation device 1) started irradiating radiation has been received within a predetermined period (until the count value reaches N1). Here, the imaging-side control unit 21 functions as a second determination unit. Furthermore, if the second determination unit determines that information on the timing of the start of radiation irradiation has been received within the predetermined period, the imaging side control unit 21 transmits the dynamic image data generated after the timing (n2) of the start of radiation irradiation to a predetermined external device (e.g., the console 5), and if the second determination unit determines that information on the timing of the start of radiation irradiation has not been received within the predetermined period, in step H12, the imaging side control unit 21 transmits the dynamic image data generated after the timing (n1) of the start of generation of the dynamic image data and information that the dynamic image data to be transmitted includes unexposed image data to a predetermined external device (e.g., the console 5). Here, the imaging side control unit 21 functions as a third transmission unit.

[0088] Next, the photographing-side control unit 21 determines whether the number of pieces of image data generated after the start of image data generation in the photographing device 2 (after n1) has reached the upper limit of the number of images that can be photographed (step H13). If the upper limit number of images has not been reached (step H13; NO), the image capturing side control unit 21 moves the process to step H13. If the upper limit number of shots has been reached (step H13; YES), the shooting side control unit 21 terminates the generation of image data and transmits the generated image data to the console 5 together with information that the image data to be transmitted includes unexposed image data (step H14). Next, the photographing-side control unit 21 controls the first notification unit to issue a notification indicating that the transmitted image data includes unexposed image data (step H15).

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

[0090] In steps H15 and H16 of the sixth modification, by notifying the user that unexposed image data is included in the image data, it is possible to prompt the user to check the images and delete the unexposed images.

[0091] Here, the photographing device 2 of the above embodiment, modification 1, modification 3, and modification 5 may include a first notification unit similar to that of modification 6. Furthermore, in the above embodiment, modification 1, modification 3, and modification 5, the photographing-side control unit 21 identifies the exposure image data. Here, the photographing-side control unit 21 may determine whether the exposure image data has been identified by the first identification unit. Here, the photographing-side control unit 21 functions as a first identification determination unit. Then, the photographing-side control unit 21 transmits the determination result by the first identification determination unit to a predetermined external device (for example, the console 5). Here, the photographing-side control unit 21 functions as a second transmission unit. Then, the photographing-side control unit 21 controls the first notification unit to issue a notification indicating the determination result by the first identification determination unit. Here, the photographing-side control unit 21 functions as a first notification control unit. The console 5 may also include a second notification unit similar to that of Modification Example 6. Upon receiving the determination result, transmitted from the photographing device 2, of whether or not the exposure image data has been identified in the photographing device 2, the console 5 controls the second notification unit to issue a notification indicating the determination result. In addition, the other device, such as the control device 1a, may be configured to have an alarm unit, and the shooting side control unit 21 may transmit the judgment result by the first identification judgment unit to the other device, and the other device that receives the judgment result may control the alarm unit to issue an alarm indicating the judgment result. In addition, in the above-described Modifications 2, 4, and 6, the console 5 identifies the exposure image data. Here, the console 5 may determine whether the exposure image data has been identified 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 issue a 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 (mobile imaging system 100A) according to this embodiment described above is a radiation irradiation device that is wirelessly connected to a radiation imaging device (imaging device 2) that generates dynamic image data and controls the sequential irradiation of radiation onto a subject. 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 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) that determines whether to start irradiation of radiation based on a delay time that is the difference between a first timing count value (n1) that indicates the timing of transmission of an irradiation permission signal that is wirelessly transmitted from the radiation imaging device and that permits the radiation irradiation device to irradiate radiation, and a second timing count value (n2) that indicates the timing of reception of the irradiation permission signal. Therefore, even when the radiation irradiation device that generates radiation and the radiation imaging device that generates radiation images are connected via wireless communication, the first judgment unit can judge whether the communication status is good or bad, making it possible to more appropriately perform dynamic imaging that generates multiple frame images.

[0093] In addition, in the radiation irradiation device, the first judgment unit judges to start irradiating radiation when the second timing count value is equal to or less than the first timing count value plus a third timing count value (m) corresponding to the upper limit time from when the radiation imaging device starts generating dynamic image data to when the radiation irradiation device irradiates radiation. Therefore, it is possible to prevent unnecessary exposure to radiation when exposure is performed in a state where image data cannot be generated.

[0094] In addition, in the radiation irradiation device, the first judgment unit judges which is larger: a fourth timing count value (na) wirelessly transmitted from the radiation imaging device, which indicates the timing at which the radiation imaging device starts generating dynamic image data, or the second timing count value; and if the fourth timing count value is larger than the second timing count value, judges that radiation irradiation will start 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 device also transmits information on the timing at which radiation irradiation is started to a predetermined external device. The first transmitting unit (irradiation-side control unit 11) transmits the signal to the Therefore, the exposure image data can be identified based on information about the timing at which radiation irradiation started.

[0096] The radiation imaging device also includes a first identification unit (imaging side control unit 21) that identifies exposure image data generated in a state where radiation was irradiated from among the generated dynamic image data based on information on the timing at which radiation irradiation was started in the radiation imaging device that is communicatively connected to the radiation irradiation device. Therefore, in the radiation imaging apparatus, by specifying the exposed image data, it is possible to delete the unexposed image data, for example.

[0097] The radiation imaging device also includes a first notification unit that issues a notification using light, sound, or vibration, a first identification judgment unit (imaging side control unit 21) that determines whether the exposure image data has been identified by the first identification unit, and a first notification control unit (imaging side control unit 21) that issues a notification using the first notification unit based on the judgment result by the first identification judgment unit. Therefore, when the photographing-side control unit 21 cannot identify the exposure image data, it can notify the user and encourage the user to check the image and delete the unexposed image.

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

[0099] The radiation imaging device is also a radiation imaging device (imaging device 2) that is wirelessly connected to a radiation irradiation device (irradiation device 1) that controls the sequential irradiation of radiation to a subject and generates dynamic image data, and is equipped with a second judgment unit (imaging side control unit 21) that judges whether information on the timing at which the radiation irradiation device started irradiating radiation has been received within a predetermined period, and a third transmission unit (imaging side control unit 21) that, when the second judgment unit judges that information on the timing at which radiation irradiation started has been received within the predetermined period, transmits dynamic image data generated after the timing at which radiation irradiation started to a predetermined external device, and, when it judges that information on the timing at which radiation irradiation started has not been received within the predetermined period, transmits dynamic image data generated after the timing at which generation of the dynamic image data started and information that the dynamic image data includes unexposed image data to the predetermined external device. Therefore, when the imaging side control unit 21 cannot obtain information on the timing at which radiation irradiation started and cannot identify the exposure image data, the exposure image data can be identified by a predetermined external device such as a console.

[0100] Furthermore, the radiographic imaging device is portable and can be stored in a medical cart. Therefore, imaging can be performed without using a communication cable.

[0101] In addition, the console 5, which is communicatively connected to the radiation irradiation device, is provided with a second identification unit (console 5) that identifies, from the dynamic image data transmitted from the radiation imaging device, exposure image data generated in a state where radiation was irradiated, based on the increase / decrease in signal values ​​or shape within the dynamic image data. Therefore, by specifying the exposed image data on the console 5, it is possible to delete the unexposed image data, etc.

[0102] The console 5 also includes a second notification unit that issues a notification using light, sound, or vibration, a second identification judgment unit (console 5) that determines whether the exposure image data has been identified by the second identification unit, and a second notification control unit (console 5) that issues a notification using the second notification unit based on the judgment result by the second identification judgment unit. Therefore, when the console 5 cannot identify the exposure image data, it can notify the user and prompt the user to check the image and delete the unexposed image.

[0103] In addition, in the console 5, the second notification control unit issues a notification by the second notification unit based on the determination result, transmitted from the radiation imaging apparatus, of whether or not the exposure image data has been identified in the radiation imaging apparatus. Therefore, when the photographing device 2 cannot identify the exposed image data, it can notify the user and encourage the user to check the image and delete the unexposed image.

[0104] The description in this embodiment is an example of a suitable radiography system according to the present invention, and the present invention is not limited to this.

[0105] For example, in the dynamic photography processing of the above embodiment, the photography side control unit 21 transmits the image data generated in n2 to n3 to the console 5, but this is not limited to this. The image data generated in n2 to n3 is linked with information indicating that the image data is exposed, and the image data generated before n2 and the image data generated after n3 are linked with information indicating that the image data is unexposed, and the images are transmitted to the console 5. Then, the console 5 may display only the image data linked with information indicating that the image data is exposed. Furthermore, the configuration may be such that these operations can be set to be switched.

[0106] Furthermore, in the dynamic imaging processing of the above embodiment and modified example, the radiation imaging system 100 is one in which the radiation irradiation device and the radiation imaging device are connected via wireless communication, but this is not limited to this. The processing of the above embodiment and modified example can also be performed in a radiation imaging system in which the radiation irradiation device and the radiation imaging device are connected via wired communication via a cable or the like, and dynamic imaging for generating multiple frame images can be more suitably performed.

[0107] In addition, the detailed configuration and detailed operation of each device constituting the radiation imaging system 100 may be modified as appropriate without departing from the spirit of the present invention. [Explanation of symbols]

[0108] 100 Radiography 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 generator 13 Storage section 14 Irradiation side interface 1b tube 2. Radiography equipment 21 imaging side control unit (first identification unit, second determination unit, first identification determination unit, first notification control unit, second transmission unit, third transmission unit) 21a Shooting side oscillator 22 Radiation detection unit 23 Readout section 24 Memory section 25. Shooting interface unit 3. Communication Cable 100A Mobile Imaging System 1A Rounding car 5 Console (second identification unit, second identification judgment unit, second notification control unit) 6 Control panel 6a Exposure switch 7 Storage area 8 Live parts 9 Access Points R Radiation

Claims

1. a radiographic imaging device for generating dynamic image data; a radiation irradiation device that is wirelessly connected to the radiation imaging device and controls the sequential irradiation of radiation onto a subject; A radiography system comprising: a signal generating unit that generates a first pulse signal emitted by the radiation imaging 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; a first identification unit that identifies exposure image data generated in a state where radiation has been irradiated from among the generated dynamic image data, based on a first delay time that is the difference between a first timing count value indicating the timing of transmission of an irradiation permission signal that is wirelessly transmitted from the radiation imaging device and that permits the radiation irradiating device to irradiate radiation, and a second timing count value indicating the timing when the radiation irradiating device receives the irradiation permission signal, and a second delay time that is the difference between a count value indicating the timing of transmission of an irradiation end signal that is wirelessly transmitted from the radiation irradiating device and that terminates radiation irradiation by the radiation irradiating device, and a count value indicating the timing when the radiation imaging device receives the irradiation end signal; A radiography system comprising:

2. The dynamic image data has an upper limit on the number of images that can be captured, 2. The radiation imaging system according to claim 1, wherein the first identification unit does not use the second delay time to identify the exposure image data when the dynamic image data generated by the radiation imaging device reaches the upper limit number of imaging times.

3. a first notification unit that notifies by light, sound, or vibration; a first identification determination unit that determines whether the exposure image data has been identified by the first identification unit; a first notification control unit that notifies the first notification unit based on a determination result by the first determination unit; The radiation imaging system according to claim 1 , comprising:

4. 2. The radiographic imaging system according to claim 1, which is portable and can be stored in a medical cart.

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