Radiation irradiation device, radiation imaging device, radiation imaging system, and program

Abstract

To enable dynamic imaging for generating a plurality of frame images to be performed more suitably even in such a state that a radiation irradiation apparatus is wirelessly connected to a radiographic apparatus.SOLUTION: A radiation irradiation apparatus (irradiation apparatus 1) is wirelessly connected to a radiographic apparatus (imaging apparatus 2) that generates dynamic image data and comprises: a signal generation unit (irradiation side control unit 11) which generates a first pulse signal emitted from 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) which determines whether or not to start irradiation of radiation on the basis of a first timing count value indicating emission timing of an irradiation permission signal that permits irradiation of the radiation from the radiation irradiation apparatus wirelessly transmitted from the radiographic apparatus and a second timing count value indicating timing of reception of the irradiation permission signal.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a radiation irradiation device, a radiation imaging device, Radiography System and programs. [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 perform dynamic imaging, in which a subject is continuously photographed at regular intervals to obtain multiple frame images, thereby analyzing the dynamic behavior (motion) of the subject and making a diagnosis. In dynamic radiography, a delay may occur between the timing at which a signal indicating 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 the input (radiation exposure start delay time). Also, a delay may occur between the timing at which a signal indicating the stop of radiation exposure is input to the radiation irradiation device and the timing at which radiation exposure from the radiation irradiation device is stopped in response to the input (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 a signal input indicating X-ray exposure to the actual exposure of X-rays, and an X-ray exposure stop delay time from a signal input indicating the stop of X-ray exposure to the actual stop of X-ray exposure, and controls X-ray exposure based on the 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 irradiation device and a radiation imaging device are connected via wireless communication and operate in synchronization with each other, there may be an exposure permission notification delay time from the timing when the radiation imaging device starts generating an image to the timing when the radiation irradiation device starts exposing radiation, and an exposure stop notification delay time from the timing when the radiation irradiation device stops exposing radiation to the timing when the radiation imaging device stops generating an image. The exposure permission notification delay time and the exposure stop notification delay time become unstable depending on the communication environment because the radiation irradiation device and the radiation imaging device are connected via wireless communication. In particular, if the exposure permission notification delay time becomes long, there are cases where dynamic imaging for the planned number of frames cannot be performed, 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 make it possible 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 a radiation image are connected via wireless communication. [Means for solving the problem]

[0007] In order to solve the above problem, the radiation irradiation apparatus of the invention described in claim 1 comprises: A radiation irradiation device that is wirelessly connected to a radiation imaging device that generates dynamic image data and controls sequential irradiation of a subject with radiation, a signal generating unit that generates a first pulse signal generated 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 determination unit that determines whether or not to start irradiating radiation based on a delay time that is a difference between a first timing count value that indicates a transmission timing of an irradiation permission signal that is wirelessly transmitted from the radiation imaging apparatus and that permits the radiation irradiating device to irradiate radiation, and a second timing count value that indicates a timing of receiving the irradiation permission signal; Equipped with.

[0008] The invention described in claim 2 is the radiation irradiation device described in claim 1, 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 corresponding to an upper limit time from when the radiation imaging device starts generating the dynamic image data to when the radiation irradiating device irradiates radiation.

[0009] The invention described in claim 3 is the radiation irradiation device described in claim 1 or 2, The first judgment unit judges which of a fourth timing count value wirelessly transmitted from the radiation imaging device and indicating the timing at which the radiation imaging device starts generating the dynamic image data or the second timing count value is larger, 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.

[0010] The invention described in claim 4 is the radiation irradiation apparatus described in any one of claims 1 to 3, The device includes a first transmitter that transmits information about the timing at which radiation irradiation is started to a predetermined external device.

[0011] The radiation imaging apparatus according to the invention described in claim 5 comprises: 5. A radiation imaging apparatus communicatively connected to the radiation irradiation apparatus according to claim 4, The apparatus further includes a first identification unit that identifies, from among the generated dynamic image data, exposure image data that was generated in a state where radiation was being irradiated, based on information on the timing at which the irradiation of radiation was started.

[0012] The invention described in claim 6 is the radiation imaging apparatus described in claim 5, A first notification unit that notifies by any one of light, sound, and vibration; a first determination unit that determines whether the exposure image data has been determined by the first determination unit; and a first notification control unit that issues a notification by the first notification unit based on a result of the determination by the first identification determination unit.

[0013] The invention described in claim 7 is the radiation imaging apparatus described in claim 6, The device further includes a second transmitting unit configured to transmit a result of the determination made by the first determining unit to a predetermined external device.

[0014] The radiation imaging apparatus according to the invention described in claim 8 comprises: A radiography apparatus that is wirelessly connected to a radiation irradiation apparatus that controls sequential irradiation of a subject with radiation and generates dynamic image data, a second determination unit that determines whether information on the timing when the radiation irradiation device starts irradiating radiation is received within a predetermined period of time; and a third transmission unit that, when it is determined by the second judgment unit that information on the timing when the radiation irradiation started has been received within the specified period, transmits to a specified external device dynamic image data generated after the timing when the radiation irradiation started, and, when it is determined that information on the timing when the radiation irradiation started is not received within the specified period, transmits to a specified external device dynamic image data generated after the timing when generation of the dynamic image data started and information that the dynamic image data includes unexposed image data.

[0015] The invention described in claim 9 is a radiation imaging apparatus according to any one of claims 5 to 8, It can be stored in a medical cart and is portable.

[0016] In addition, the invention according to claim 10 Radiography System teeth, The radiation irradiation device according to any one of claims 1 to 4. 、 The radiation irradiation device. Connected console And equipped with , The console includes: The apparatus further includes a second identification unit that identifies, from the dynamic image data transmitted from the radiation imaging device, exposure image data that was generated under irradiation with radiation based on an increase or decrease in signal values ​​or a shape within the dynamic image data.

[0017] The invention described in claim 11 is the same as the invention described in claim 10. Radiography System In The console includes: A second notification unit that notifies the user by any one of light, sound, and vibration; a second identification determination unit that determines whether the exposure image data has been identified by the second identification unit; and a second notification control unit that issues a notification by the second notification unit based on a result of the determination by the second specification determination unit.

[0018] The invention described in claim 12 is the same as the invention described in claim 11. Radiography System In The second notification control unit issues a notification by the second notification unit based on a determination result transmitted from the radiation imaging apparatus as to whether or not exposure image data has been identified in the radiation imaging apparatus.

[0019] The program of the invention described in claim 13 is: a computer of a radiation irradiation device that is wirelessly connected to a radiation imaging device that generates dynamic image data and controls the sequential irradiation of radiation to a subject; a signal generating unit that generates a first pulse signal generated 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 determination unit that determines whether or not to start irradiating radiation based on a delay time that is a difference between a first timing count value that indicates a transmission timing of an irradiation permission signal that is wirelessly transmitted from the radiation imaging apparatus and that permits the radiation irradiating device to irradiate radiation, and a second timing count value that indicates a reception timing of the irradiation permission signal; 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 connected via wireless communication, dynamic imaging that generates multiple frame images can be more suitably performed. [Brief description 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. [Diagram 2] 2 is a block diagram showing a specific configuration of a radiation irradiation device included in the radiation imaging system of FIG. 1. [Diagram 3] 2 is a block diagram showing a specific configuration of a radiation imaging apparatus included in the radiation imaging system of FIG. 1. [Figure 4] 2 is a block diagram showing an example of a mobile radiography system configured using the radiography system of FIG. 1. [Diagram 5] FIG. 1 is a diagram showing an example of dynamic imaging in a mobile imaging system. [Figure 6] 13 is a flowchart showing a synchronization process. [Figure 7] 13 is a flowchart showing dynamic photography processing. [Figure 8] 13 is a flowchart showing dynamic imaging processing according to the first modified example. [Figure 9]13 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] 20 is a flowchart showing dynamic imaging processing according to the sixth modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[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 those illustrated in the drawings.

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

[0024] [1-1. Overview 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 to the subject and the imaging device 2 arranged behind it, and is configured with a radiation control device (hereinafter referred to as control device 1a) and a tube 1b. A 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 imaging device 2 will 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 unit 7 of the medical cart that stores the imaging device 2 (described later), and the like. Furthermore, the external IF can be disconnected (eg, removed) from at least one of the irradiation device 1 and the imaging device 2 as necessary.

[0028] [1-2. Outline of operation of the radiation imaging 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. Moreover, the imaging system 100 according to this embodiment is capable of capturing moving images (hereinafter, dynamic imaging). That is, based on one imaging operation (pressing the exposure switch 6a 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 video imaging, but does not include capturing still images while displaying a moving image. A series of images obtained by dynamic imaging is called dynamic images. Dynamic images include video, but do not include images obtained by capturing still images while displaying a video.

[0029] In addition, the imaging system 100 can be configured to be capable of communicating with other systems such as a Radiology Information System (RIS) and a Picture Archiving and Communication System (PACS), and 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, irradiation side IF unit 14), and the like. Furthermore, each of the components 11 to 14 of the control device 1a can receive power from a power cable or a built-in power source (not shown).

[0032] The irradiation side control section 11 includes a CPU (Central Processing Unit), a RAM (Random Access Memory) and the like, and is configured to comprehensively control the operations of the sections 12 to 14 of the irradiation device 1. The irradiation side control unit 11 also includes an oscillator (hereinafter, 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 generated timing information includes, for example, a timing signal (second pulse signal) and time information. The timing signal refers to a pulse-like signal output every time one or more clocks are generated. The time information refers to a count value (second count value) for counting up the second pulse signal. Moreover, 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 described later to synchronize the timing signal and the count value with the imaging device 2. That is, the irradiation side control unit 11 generates a first pulse signal (described later) generated by the radiation imaging device (imaging device 2) and 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 later to determine whether or not 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, which will be described later, to transmit information on the timing at which radiation irradiation is 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 (e.g., 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, etc.). The shooting mode included in the shooting conditions is information on a shooting method such as still image shooting, dynamic 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 suitable for the shooting mode according to the shooting mode setting. When dynamic imaging is included in the imaging conditions, a pulse voltage is repeatedly applied at a predetermined interval every time a timing signal is received. When a voltage is applied from high voltage generating unit 12 to tube 1b, it generates a dose of radiation R according 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 with a 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 (eg, timing information, etc.) generated during the process performed by the emission side control unit 11.

[0036] The irradiation-side IF unit 14 can be connected to an external IF, and is configured to be capable of transmitting and receiving 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 in accordance with a program stored in the storage section 13 as follows. For example, the irradiation side control unit 11 sets various imaging conditions (conditions related to the subject, such as the imaging mode (still image imaging, dynamic imaging), imaging target part, 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 period corresponding to the frame rate.

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

[0039] 3-1. Specific configuration of the radiation imaging device The imaging device 2 according to this embodiment includes, in addition to a housing (not shown), 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, imaging side IF unit 25), etc., as shown in FIG. 3. Furthermore, each of the sections 21 to 25 of the imaging device 2 can receive power from a power cable or a 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, a RAM, and the like. The photographing side control unit 21 also includes an oscillator (hereinafter, 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 photographing side control unit 21 has a function of periodically generating timing information using a clock generated by the photographing 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 that is output every 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. The format of the timing information generated here is preferably the same as the timing information generated by the irradiation device 1. Moreover, 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 control unit 21 executes a dynamic imaging process described later, and identifies, from among the generated dynamic image data, the exposure image data generated in a state where radiation was irradiated, based on information on the timing at which radiation irradiation was started. At this time, the imaging control unit 21 functions as a first identification unit.

[0042] The radiation detection unit 22 may have a substrate on which a plurality of pixels are two-dimensionally arranged, the pixels having radiation detection elements that directly or indirectly generate an electric charge corresponding to the dose of radiation R received from the outside, and switch elements that are provided between each radiation detection element and wiring and can be switched to an on state that allows current to flow between the radiation detection element and the wiring, or an off state that does not allow current to flow, and any conventionally known type may be used. In other words, 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 detects radiation R directly without going through a scintillator or the like.

[0043] The readout unit 23 may be configured to read 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, etc.) 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 capable of transmitting and receiving various 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 source, the built-in power source 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 that the manufacturing cost of the image capturing device 2 can be reduced and the number of times it needs to be charged can be reduced. Either configuration is preferable for taking multiple shots.

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

[0048] The "initialized state" is a state in which an on-voltage is applied to each switch element and charges generated by the radiation detection elements are not accumulated in each pixel (charges are discharged 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 "read-out and transfer state" is a state in which an on-voltage is applied to each switch element, the read-out 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 repeating the above-mentioned 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 has elapsed. In this way, power consumption can be reduced during a series of workflows.

[0050] <4. Mobile radiography system> Next, a mobile radiography system 100A configured using the above-mentioned radiography system 100 will be described in detail. 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 to transmit and receive information between the irradiation device 1 and to supply power to the imaging device 2, etc. For example, when a communication cable is used for connection to the imaging device 2, a pulse signal or a timing signal may be included in the control signal of the communication cable, so that the irradiation device 1 and the imaging device 2 can be synchronized for imaging. However, even when performing imaging in an imaging room, there are cases where imaging must be performed while the patient is in a wheelchair or bed. In such cases, imaging with the communication cable connected to the imaging device 2 requires 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 touches the subject, which is problematic from a hygiene standpoint. 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 by moving around using the mobile imaging system 100A, imaging is performed in the ward where the subject is recuperating. In this case, imaging is performed on the bed where the subject is lying down, and it is necessary to take out 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 such as the communication cable being an obstacle, the risk of the communication cable being pulled out and communication being disabled, and hygiene problems due to the communication cable touching the subject, more than when imaging is performed in the imaging room, and there has been a demand for imaging without using a communication cable. In particular, since a communication cable was not required during imaging using CR (Computed Radiography), there was a demand for imaging using the imaging device 2 without using a communication cable in order to obtain the same ease of operation as CR.

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

[0054] [4-2. Specific configuration of mobile radiography system] As shown in FIG. 4, the mobile radiography system 100A is composed of a mobile 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 exposure 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). In addition, the console 5 is capable of acquiring image data of a radiation image generated by the imaging device 2, storing the image data in itself, or transmitting the image data to another device (PACS, dynamic analysis device, etc.).

[0057] Furthermore, the console 5 executes a dynamic imaging process described later to identify, from the dynamic image data transmitted from the radiation imaging device (imaging device 2), exposure image data that was generated in a state where radiation was irradiated, based on an increase / decrease in a signal value or a shape in the dynamic image data. At this time, the console 5 functions as a second identification unit.

[0058] The operation panel 6 is provided with an exposure switch 6a. Then, based on the exposure switch 6a being 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. Also, based on the exposure switch 6a being 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 so that the imaging device 2 can be stored 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, a tip of the communication cable 3 is attached to a position facing the imaging side IF unit 25 inside the storage section 7.

[0060] The charging section 8 is for charging the built-in power source of the photographing device 2 . The charging unit 8 may be one that charges by receiving power from an external power source (e.g., a hospital outlet), one that charges by receiving power from a power source provided in the medical cart 1A, or one that charges 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 Next, a 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, the control device 1a transmits an exposure permission request to the radiography device 2, and image data generation is started in the radiography device 2. The timing at this time is designated as T1. Next, an exposure permission notification, which is an irradiation permission signal, is transmitted from the imaging apparatus 2 to the control apparatus 1a, and the control apparatus 1a starts exposure. This timing is designated as T2. Here, T1 to T2 is defined as an exposure permission notification delay time. During the 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, when the user releases the exposure switch 6a, which is an exposure stop operation, before taking all the photographs that can be taken, which is the upper limit of the number of photographs that the user can take, 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. This timing is designated as T4. Here, T3 to T4 is set as an 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 has an upper limit due to design constraints such as the storage area of ​​the storage unit 24 of the radiography device 2 and noise effects over time. If the number of image data that can be generated reaches the upper limit and exposure is performed in a state in which image data cannot be generated, unnecessary exposure will occur. Therefore, in order to prevent unnecessary exposure, the total number of possible images 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 number of generated image data due to design constraints. Furthermore, as a diagnostic image to be used for diagnosis, it is necessary to obtain only the exposure image data generated while exposure is being performed, and in order to correctly analyze the dynamic images in a dynamic analysis device that analyzes dynamic images, it is necessary to obtain only the exposure image data, so it is necessary to identify the exposure image data from the image data generated by the photographing device 2. In order to meet the above requirements, the mobile imaging system 100A executes the processes shown in FIGS.

[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. At this time, if the timing at which each device is turned on differs, 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 clock information synchronization instruction, the shooting side control unit 21 transmits a clock 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 a count value, which is time information, and transmits the generated timing information to the photographing 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 synchronizes the count value. The copy signal may start from the timing of the falling edge, and may include an error within a required accuracy. That is, the illumination side control unit 11 and the imaging side control unit 21 generate timing information having 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 clock information synchronization completion notification 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 by itself. At this time, the time measurement information of the control device 1a and the photographing device 2 are 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 radiographing device 2, and the console 5. In the mobile radiography system 100A in which the timekeeping information of the control device 1a and the radiographing 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 that 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 transmits information N1 (=n1+m) obtained by adding 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, together with the exposure permission notification to the control device 1a (step B3). The upper limit of the exposure permission notification delay time is preset based on the upper limit number of images to be captured 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). Moreover, 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 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, thereby preventing unnecessary exposure.

[0070] After step B5, the irradiation side control unit 11 transmits information on n2 as information on the timing at which radiation irradiation was started to the imaging device 2 (step B7). Next, the imaging side control unit 21 that has received the information on n2 sequentially transmits the image data generated after n2 to the console 5 (step B8). Next, the console 5 judges 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 has not been 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). The imaging side control unit 21, which has received the exposure stop notification and the information of n3, 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 specifies the image data generated from n2 to n3 as exposure image data.

[0071] (Variation 1) Next, a first modified example of the above embodiment will be described. 8 is a flowchart showing the dynamic imaging process of this modification. The following mainly describes the differences from the above embodiment. The configuration of the mobile imaging system 100A of this modification 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 executes 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 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 of na and 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 exposure permission notification to the control device 1a together with the exposure permission notification (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 controller 11 judges whether the count value has reached na (step C5). If the count value is not 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 becomes na. When the count value becomes na (step C5; YES), the irradiation side controller 11 controls the high voltage generator 12 to start exposure (step C6). At the same time, the imaging side controller 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 judges whether n2 is equal to or less than N2 (step C8). If n2 is equal to or smaller than N2 (step C8; YES), the irradiation side control unit 11 shifts the process to step C6. In this case, the irradiation side control unit 11 then transmits information on n2 to the imaging device 2 as information on the timing of starting irradiation of radiation. Thereafter, instead of step C7, the imaging side control unit 21 that has received the information on n2 sequentially transmits image data generated after n2 to the console 5. Moreover, 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 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 executes step C14 similar to step B13 of the dynamic imaging process of the above embodiment, and ends this process. Here, the photographing-side control unit 21 specifies the image data generated from na to n3 (when n2≦na) or from n2 to n3 (when n2>na) as exposure image data.

[0075] In the dynamic radiography process of the first modification, 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] (Variation 2) Next, a second modification of the above embodiment will be described. 9 is a flowchart showing the dynamic radiography process of this modification. The following mainly describes the differences from the above embodiment. The configuration of the mobile radiography system 100A of this modification is the same as that of the mobile radiography 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 executes 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 in the above embodiment. Next, the imaging side control unit 21 starts generating image data. Then, the imaging side control unit 21 transmits information N1 (=n1+m) obtained by adding 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 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 in the above embodiment. Next, the console 5 executes 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 executes step D9 similar to 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 apparatus 2 (step D10). 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 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 exposure image data from the image data transmitted from the imaging device 2 based on the received range of the count value 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 will mainly explain 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 detection 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 the unexposed image data and the exposed image data according to the shape in the generated image data.

[0079] In the dynamic radiography processing of this modified example shown in FIG. 10, first, the console 5 executes step E1 similar to step B1 of the dynamic radiography processing of the above embodiment. Next, the irradiation side control unit 11 performs step E2 similar to 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 transmits information N1 (=n1+m) obtained by adding a 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 image data identified as exposure image data by the above-mentioned identification 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 in the above embodiment. Next, the console 5 executes 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 executes step E9 similar to 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 stops generating image data, and transmits the image data that has been identified as exposure image data by the above-mentioned identification method from the generated image data to the console 5 (step E11), and ends this process.

[0080] (Variation 4) Next, a fourth modified example of the above embodiment will be described. 11 is a flowchart showing the dynamic imaging process of this modification. The following mainly describes the differences from the above embodiment. The configuration of the mobile imaging system 100A of this modification 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 specifies 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 executes 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 in the above embodiment. Next, the imaging side control unit 21 starts generating image data. Then, the imaging side control unit 21 transmits information N1 (=n1+m) obtained by adding 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 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 F3). Next, the console 5 identifies exposure image data from the transmitted image data based on the increase / decrease in signal values ​​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 in the above embodiment. Next, the console 5 executes steps F8 and F9 which are similar to steps B9 and B10 of the dynamic imaging process of the above embodiment. Next, the irradiation side control unit 11 executes step F10 similar to 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 apparatus 2 (step F11). The imaging side controller 21, which has received the exposure stop notification, 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 modification. The following mainly describes the differences from the above embodiment. The configuration of the mobile imaging system 100A of this modification is the same as that of the mobile imaging system 100A of the above embodiment. The dynamic radiography process of this modified example is a case where the number of possible images is taken without the user releasing the exposure switch 6a before the number of possible images is taken, as in the above embodiment.

[0083] In the dynamic radiography processing of this modified example shown in FIG. 12, first, the console 5 executes step G1 similar to step B1 of the dynamic radiography processing of the above embodiment. Next, the irradiation side control unit 11 performs step G2 similar to step B2 of the dynamic imaging process in the above embodiment. Next, the imaging side control unit 21 executes step G3 which is similar to step B3 of the dynamic imaging process in the above embodiment. Next, the irradiation side control unit 11 performs steps G4 to G7 similar to steps B4 to B7 of the dynamic imaging process in the above embodiment. Next, the imaging side control unit 21 executes step G8 similar to step B8 of the dynamic imaging process in the above embodiment. Next, the irradiation side control unit 11 determines whether or not 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 photographed 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 that can be photographed (step G11). If the number of images that can be photographed has not been reached (step G11; NO), the photographing-side control unit 21 shifts 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 shooting-side control unit 21 specifies 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. Therefore, it is possible to prevent unexposed image data from being generated during the exposure stop notification delay time.

[0085] (Variation 6) Next, a sixth modified example of the above embodiment will be described. 13 is a flowchart showing the dynamic imaging process of this modified example. The following will mainly explain 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 includes a second notification unit (not shown) that notifies the user with light, sound, vibration, etc. The dynamic photography processing of this modified example corresponds to a case in which 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 FIG. 7 due to a communication failure between the control device 1a and the photographing device 2, and the user does not release the exposure switch 6a before the possible number of images are taken, and the possible number of images are taken.

[0086] In the dynamic imaging process of this modified example shown in FIG. 13, first, the console 5 executes step H1 similar to step B1 of the dynamic imaging process of the above embodiment. Next, the irradiation side control unit 11 performs step H2 similar to step B2 of the dynamic imaging process in the above embodiment. Next, the imaging side control unit 21 executes step H3, which is similar to step B3 of the dynamic imaging process in the above embodiment. Next, the irradiation side control unit 11 performs steps H4 to H7 similar to steps B4 to B7 of the dynamic imaging process in the above embodiment. Next, the irradiation side control unit 11 judges whether or not 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 photographed 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 judges whether or not the information of n2 has been received from the control device 1a (step H10). As shown in FIG. 7, when communication is possible between the control device 1a and the photographing device 2 and the photographing side control unit 21 can receive information of n2 (step H10; YES), the photographing side control unit 21 transitions the process to step B8 in FIG. 7, that is, sequentially transmits image data generated after n2 to the console 5. If the information on n2 is not received (step H10; NO), the photographing-side control unit 21 judges whether the count value has reached N1 (step H11). If the count value is not N1 (step H11; NO), the imaging side control unit 21 transitions the process 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 from 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 photographing 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 why the image data generated after n1 includes unexposed image data is that the photographing side control unit 21 cannot obtain the count value for which exposure was performed due to the loss of communication between the control device 1a and the photographing device 2, and therefore cannot identify the exposed image data. 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) started irradiating radiation 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. Furthermore, when the second determination unit determines that the 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 when the 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 the 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 judges whether or not the image data generated after the start of image data generation in the photographing device 2 (after n1) has reached the upper limit number of images to be photographed (step H13). If the upper limit number of photographing operations has not been reached (step H13; NO), the photographing side control unit 21 shifts 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 contains unexposed image data (step H14). Next, the photographing-side control unit 21 controls the first notification unit to perform notification that the transmitted image data includes unexposed image data (step H15).

[0089] Next, the console 5, having 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 the count value for which exposure was performed (step H19), and ends this process.

[0090] In steps H15 and H16 of the sixth modified example, by notifying the user that unexposed image data is included in the image data, it is possible to encourage 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. In addition, in the above embodiment, modification 1, modification 3, and modification 5, the photographing side control unit 21 specifies the exposure image data. Here, the photographing side control unit 21 may determine whether the exposure image data has been specified by the first specification unit. Here, the photographing side control unit 21 functions as a first specification determination unit. Then, the photographing side control unit 21 transmits the determination result by the first specification 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 perform a notification indicating the determination result by the first specification determination unit. Here, the photographing side control unit 21 functions as a first notification control unit. Moreover, the console 5 may include a second notification unit similar to that of Modification Example 6. The console 5 receives 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, and controls the second notification unit to perform notification of 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, receiving the judgment result, may control the alarm unit to issue an alarm indicating the judgment result. In addition, in the above-mentioned Modification 2, Modification 4, and Modification 6, the console 5 identifies the exposure image data. Here, the console 5 may determine whether or not the exposure image data has been identified by the second identification unit. Here, the console 5 functions as the second identification judgment unit. Then, the console 5 controls the second notification unit to perform a notification indicating the judgment result by the second identification judgment unit. Here, the console 5 functions as the 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 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 and 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 to permit the radiation irradiation device to irradiate radiation, and a second timing count value (n2) that indicates the timing of receiving the irradiation permission signal. Therefore, even if the radiation irradiation device that generates radiation and the radiation imaging device that generates a radiation image are connected via wireless communication, the first judgment unit can judge whether the communication state 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 that would otherwise occur when exposure is performed in a state in which image data cannot be generated.

[0094] In addition, in the radiation irradiation device, the first judgment unit judges which of the fourth timing count value (na) wirelessly transmitted from the radiation imaging device and indicating the timing at which the radiation imaging device starts generating dynamic image data or the second timing count value is larger, 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 irradiating device also includes a first transmitting unit (irradiation side control unit 11) that transmits information on the timing at which radiation irradiation is started to a predetermined external device. Therefore, the exposure image data can be specified 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, from among the generated dynamic image data, exposure image data that was generated in a state in which radiation was irradiated, 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 an alert by using any of light, sound, and vibration, a first identification judgment unit (imaging side control unit 21) that judges 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 an alert by the first notification unit based on the judgment result by the first identification judgment unit. Therefore, when the shooting-side control unit 21 cannot specify the exposed image data, it is possible to notify the user and encourage the user to check the images and delete the unexposed images.

[0098] The radiation imaging apparatus also includes a second transmission section (imaging side control section 21) that transmits the result of the determination made 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 images and delete the unexposed images.

[0099] The radiation imaging device is 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 when the radiation irradiation device started to irradiate radiation has been received within a predetermined period, and a third transmission unit (imaging side control unit 21) that transmits dynamic image data generated after the timing when radiation irradiation started to a predetermined external device when the second judgment unit judges that the information on the timing when radiation irradiation started has been received within the predetermined period, and transmits to the predetermined external device dynamic image data generated after the timing when generation of the dynamic image data started and information that the dynamic image data includes unexposed image data when it is judged that the information on the timing when radiation irradiation started has not been received within the predetermined period. Therefore, when the imaging side control unit 21 cannot obtain information on the timing at which radiation irradiation is started and cannot specify the exposure image data, the exposure image data can be specified in a predetermined external device such as a console.

[0100] Furthermore, the radiography apparatus can be stored in a medical cart and is therefore portable. 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) which identifies, from the dynamic image data transmitted from the radiation imaging device, exposure image data which was generated in a state where radiation was irradiated, based on an increase / decrease in signal values ​​or a shape in 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 by means of light, sound, or vibration, a second identification judgment unit (console 5) that judges 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 by 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, a notification is given to the user, so that the user is prompted to check the images and delete the unexposed images.

[0103] 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 is unable to identify the exposed image data, it is possible to notify the user and encourage the user to check the images and delete the unexposed images.

[0104] It should be noted that the description of this embodiment is merely an example of a suitable radiation imaging system according to the present invention, and the present invention is not limited to this.

[0105] For example, in the dynamic photography process 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 thereto. The image data generated in n2 to n3 are linked with information that they are exposed image data, and the image data generated before n2 and the image data generated after n3 are linked with information that they are unexposed image data, and the images are transmitted to the console 5. Then, the console 5 may display only the image data that is linked with information that they are exposed image data. Also, a configuration may be possible in which these operations can be set to be switched.

[0106] In the dynamic imaging process of the above embodiment and modified example, the radiation imaging system 100 is in a state where the radiation irradiation device and the radiation imaging device are connected via wireless communication, but this is not limited to this. The process of the above embodiment and modified example can also be executed 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 a plurality of frame images can be more suitably performed.

[0107] In addition, the detailed configuration and 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 part 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 section 3 Communication Cable 100A Mobile Radiographing 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 section 8 Live parts 9. Access Points R Radiation

Claims

1. A radiation irradiation device that is wirelessly connected to a radiation imaging device that generates dynamic image data and controls sequential irradiation of a subject with radiation, a signal generating unit that generates a first pulse signal generated 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 determination unit that determines whether or not to start irradiating radiation based on a delay time that is a difference between a first timing count value that indicates a transmission timing of an irradiation permission signal that is wirelessly transmitted from the radiation imaging apparatus and that permits the radiation irradiating device to irradiate radiation, and a second timing count value that indicates a timing of receiving the irradiation permission signal; A radiation irradiation device comprising:

2. 2. The radiation irradiation device according to claim 1, wherein 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 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.

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

4. The radiation irradiation device according to claim 1 , further comprising a first transmission unit configured to transmit information regarding a timing at which irradiation of radiation is started to a predetermined external device.

5. 5. A radiation imaging apparatus communicatively connected to the radiation irradiation apparatus according to claim 4, A radiographic imaging apparatus including a first identification unit that identifies, from among the generated dynamic image data, exposure image data that was generated in a state where radiation was being irradiated, based on information on the timing at which the irradiation of the radiation was started.

6. A first notification unit that notifies by any one of light, sound, and vibration; a first determination unit that determines whether the first determination unit has been able to determine the exposure image data; The radiation imaging apparatus according to claim 5 , further comprising: a first notification control unit that issues a notification by the first notification unit based on a result of the determination by the first identification determination unit.

7. The radiation imaging apparatus according to claim 6 , further comprising a second transmitting unit configured to transmit a result of the determination made by the first determination unit to a predetermined external device.

8. A radiography apparatus that is wirelessly connected to a radiation irradiation apparatus that controls sequential irradiation of a subject with radiation and generates dynamic image data, a second determination unit that determines whether information on a timing when the radiation irradiation device starts irradiating radiation is received within a predetermined period of time; a third transmission unit that, when it is determined by the second judgment unit that information on the timing when the radiation irradiation started has been received within the specified period, transmits dynamic image data generated after the timing when the radiation irradiation started to a specified external device, and, when it is determined that information on the timing when the radiation irradiation started is not received within the specified period, transmits dynamic image data generated after the timing when the generation of dynamic image data started and information that the dynamic image data includes unexposed image data to a specified external device.

9. 9. The radiographic imaging apparatus according to claim 5, which is portable and can be stored in a medical cart.

10. The radiation irradiation device according to any one of claims 1 to 4, a console communicatively connected to the radiation irradiation device; The console is a radiation imaging system having a second identification unit that identifies exposure image data generated in a state where radiation was irradiated from the dynamic image data transmitted from the radiation imaging device based on an increase / decrease in signal values ​​or a shape in the dynamic image data.

11. The console, A second notification unit that notifies the user by any one of light, sound, and vibration; a second identification determination unit that determines whether the exposure image data has been identified by the second identification unit; The radiation imaging system according to claim 10 , further comprising: a second notification control unit that causes the second notification unit to give a notification based on a result of the determination made by the second identification determination unit.

12. The radiation imaging system according to claim 11 , wherein the second notification control unit notifies via the second notification unit based on a judgment result transmitted from the radiation imaging device as to whether or not exposure image data has been identified in the radiation imaging device.

13. a computer of a radiation irradiation device that is wirelessly connected to a radiation imaging device that generates dynamic image data and controls the sequential irradiation of radiation to a subject; a signal generating unit that generates a first pulse signal generated 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 determination unit that determines whether or not to start irradiating radiation based on a delay time that is a difference between a first timing count value that indicates a transmission timing of an irradiation permission signal that is wirelessly transmitted from the radiation imaging apparatus and that permits the radiation irradiating device to irradiate radiation, and a second timing count value that indicates a reception timing of the irradiation permission signal; A program that functions as a

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