Radiography control apparatus, radiographic system, and program

Abstract

To provide a radiography control apparatus, a radiographic system, and a program capable of acquiring a radiographic image for a required period by an easy-to-use operation while suppressing an increase in exposure dose of a subject.SOLUTION: A radiography control apparatus controls a radiographic unit capable of capturing a radiographic image by irradiation of a radioactive ray, and includes an imaging control unit that controls the radiographic unit in an intermittent imaging mode in which a dynamic image or a still image captured by the radiographic unit can be captured a plurality of times during an imaging period from the start of one imaging to the end of the imaging, and the imaging control unit determines the end of the one imaging period on the basis of a predetermined condition.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a radiography control device, a radiography system, and a program. [Background technology]

[0002] Conventionally, there has been known a radiographic imaging system for taking radiographic images of a subject in an imaging room in a hospital, etc. For example, Patent Document 1 discloses a configuration of a medical cart for taking radiographic images of subjects who have difficulty moving to an imaging room, such as seriously injured people. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2019-5073 Summary of the Invention [Problem to be solved by the invention]

[0004] In radiographic imaging, the total dose is limited in consideration of the radiation exposure of the subject. In particular, in imaging outside of an imaging room, the total dose per imaging session is further limited from the perspective of risk management. In such an environment outside of an imaging room, there is a problem that imaging that requires radiation exposure over a relatively long period of time, such as fluoroscopic imaging, cannot be performed.

[0005] Due to the above problems, for example, when it is desired to take photographs to check the internal state of the body during follow-up observation during a procedure or when a contrast agent is injected, it is necessary to move the subject to a fluoroscopy room to take the photographs regardless of the subject's physical condition, which places a great burden on the subject.

[0006] An object of the present invention is to provide a radiography control device, a radiography system, and a program that are capable of acquiring radiographic images for a required period with easy-to-use operations while suppressing an increase in the amount of radiation exposure of a subject. [Means for solving the problem]

[0007] The radiography control device according to the present invention comprises: A radiation imaging control device that controls a radiation imaging unit capable of capturing a radiation image by irradiating radiation, a control unit that controls the radiographic imaging unit in an intermittent imaging mode that allows dynamic images or still images to be captured multiple times by the radiographic imaging unit during an imaging period from the start to the end of one imaging session; The control unit determines the end of the imaging for the one imaging period.

[0008] The radiation imaging system according to the present invention comprises: Radiography Department and The above-mentioned radiation imaging control device; Equipped with.

[0009] The program according to the present invention comprises: A program for a radiography control device that controls a radiography unit capable of capturing a radiographic image by irradiating radiation, On the computer, a process of controlling the radiographic imaging unit in an intermittent imaging mode in which dynamic images or still images captured by the radiographic imaging unit can be captured multiple times during an imaging period from the start to the end of one imaging session; A process of determining the end of the imaging for one imaging period based on a predetermined condition; Execute the following. [Effects of the Invention]

[0010] According to the present invention, radiation images for a required period can be acquired through easy-to-use operations while suppressing an increase in the amount of radiation exposure to the subject. [Brief explanation of the drawings]

[0011] [Figure 1A] 1 is a diagram showing a radiation imaging system according to an embodiment of the present invention; [Figure 1B] FIG. 2 is a diagram illustrating an example of the configuration of a radiation source. [Figure 2] FIG. 2 is a block diagram showing the configuration of a main part of a control system according to the present embodiment. [Figure 3] FIG. 10 is a diagram schematically illustrating pulse irradiation in a normal imaging mode. [Figure 4] FIG. 10 is a diagram schematically illustrating an example of pulse irradiation in an intermittent photography mode. [Figure 5] FIG. 10 is a diagram showing the state transition of the exposure switch during one imaging period. [Figure 6] 10 is a flowchart showing an example of the operation of an inspection process by the imaging control unit. [Figure 7] FIG. 3 is a diagram illustrating an example of a display screen of a display unit. [Figure 8] FIG. 10 is a diagram showing a radiation imaging system according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described in detail with reference to the accompanying drawings. Fig. 1A is a diagram showing a radiography system according to an embodiment of the present invention.

[0013] 1A, the radiography system 1 according to this embodiment is capable of capturing still and dynamic images, and is a system for visiting subjects who have difficulty moving around to capture radiographic images. The radiography system 1 can be applied to, for example, hospital rooms, ICUs (Intensive Care Units), operating rooms, etc.

[0014] The radiation imaging system 1 includes a main body 10, one or more FPDs (Flat Panel Detectors) 20, and a radiation irradiation device 30.

[0015] Furthermore, external systems are connected to the radiation imaging system 1 via a communication network. The external systems include a picture archiving and communication system (PACS) 2, a hospital information system (HIS) 3, and a radiology information system (RIS) 4.

[0016] In the communication network including the radiography system 1, PACS 2, HIS 3, and RIS 4, information is transmitted and received in accordance with, for example, the DICOM (Digital Image and Communications in Medicine) standard.

[0017] The FPD 20 is a portable radiation detector capable of capturing still and dynamic images. The FPD 20 includes radiation detection elements arranged two-dimensionally on a glass substrate, for example. The radiation detection elements are composed of semiconductor image sensors such as photodiodes. The radiation detection elements detect radiation that is irradiated from the radiation irradiation device 30 (radiation source) and has passed through at least the subject, according to its intensity, and convert the detected radiation into an electrical signal and store it. A switching unit, such as a TFT (Thin Film Transistor), is connected to each radiation detection element, and the switching unit controls the storage and readout of the electrical signal to obtain image data.

[0018] The FPD 20 may be an indirect conversion type that converts radiation into an electrical signal by a photoelectric conversion element via a scintillator, or may be a direct conversion type that directly converts radiation into an electrical signal.

[0019] The FPD 20 is also connected to the main body 10 of the radiation imaging system 1 via a communication network, and performs wired or wireless communication with the main body. Specifically, the FPD 20 receives various control signals from the main body 10 via a communication cable and transmits generated image data to the main body 10.

[0020] The main body 10 is also provided with a storage section (not shown) capable of storing the FPD 20. The main body 10 is transported to a hospital room with the FPD 20 stored in the storage section.

[0021] The radiation irradiation device 30 includes a synchronization signal output unit (not shown), a generator (not shown), a radiation source (not shown), etc. The radiation irradiation device 30 and the FPD 20 correspond to the "radiography unit" of the present invention.

[0022] When an exposure switch 41A (described later) is operated, the synchronization signal output unit outputs a pulsed synchronization signal to the generator and the FPD 20. When capturing a still image, a synchronization signal is transmitted only once per still image, and when capturing a dynamic image, a synchronization signal with the same cycle is transmitted multiple times.

[0023] The generator is configured to be able to apply a voltage to the radiation source according to preset radiation irradiation conditions (tube voltage, tube current, irradiation time, etc.) every time a synchronization signal is input from the synchronization signal output unit.

[0024] The radiation source (tube) includes a rotating anode, a filament, and the like. As shown in FIG. 1B, the rotating anode is composed of a target 31, a rotor or anode rotor 32 that rotates the anode, an anode shaft (anode axis) 33, and bearings (not shown). The anode rotor 32 rotates the target 31 at high speed using the principle of an induction motor. The filament 34 is attached to a cathode sleeve 35 that is positioned opposite the target 31. When a voltage is applied from the generator, the filament 34 irradiates the target 31 of the rotating anode with an electron beam corresponding to the voltage, and the target 31 of the rotating anode generates a radiation dose corresponding to the intensity of the electron beam.

[0025] In addition, the radiation source can be rotated around a horizontally extending rotation axis, and the radiation outlet can be switched between facing horizontally (for taking three-dimensional images) and facing vertically (for taking images in a supine position).

[0026] The main body 10 also functions as a console (radiography control device). As shown in Fig. 2, the main body 10 includes an imaging control unit 40, an operation unit 41, a display unit 42, a storage unit 43, a communication unit 44, a drive unit 45, a battery 46, a connector 47, a charging unit 48, etc.

[0027] The imaging control unit 40 is stored in the main body 10 and includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), etc. In the imaging control unit 40, the CPU reads out a program corresponding to the processing content from the ROM and loads it into the RAM. Then, the imaging control unit 40 cooperates with the loaded program to centrally control the operation of each unit.

[0028] The imaging control unit 40 also controls the imaging so that radiographic images are captured in an intermittent imaging mode, which allows multiple capture of dynamic or still images captured by the FPD 20 during an imaging period from the start to the end of one imaging session. The control of the intermittent imaging mode by the imaging control unit 40 will be described later.

[0029] The operation unit 41 has a touch panel or the like in which transparent electrodes are arranged in a grid pattern so as to cover the surface of the display unit 42. The touch panel detects a position pressed by a finger, a touch pen, or the like, and inputs the position information to the imaging control unit 40 as operation information.

[0030] The operation unit 41 also includes an exposure switch 41A for operating the radiation irradiating device 30. The exposure switch 41A is a switch that allows the user to instruct the radiation irradiating device 30 to irradiate radiation.

[0031] The display unit 42 is configured by a monitor such as an LCD (Liquid Crystal Display) or a CRT (Cathode Ray Tube), etc. The display unit 42 performs display in accordance with instructions of a display signal input from the imaging control unit 40.

[0032] The storage unit 43 is configured by a non-volatile semiconductor memory, a hard disk, etc. The storage unit 43 stores various programs executed by the imaging control unit 40, parameters required for executing processing by the programs, data such as processing results, etc.

[0033] The memory unit 43 also includes an examination order information memory unit 43A, etc. The examination order information memory unit 43A stores examination order information acquired from the RIS 4. Here, the examination order information includes subject information and examination information. The subject information includes the subject ID, name, sex, age, hospital room (ward), etc. of the subject to be examined. The examination information includes the examination ID, examination date, and imaging orders for each imaging performed during the examination. The imaging order includes the imaging region, imaging direction, classification of still image / dynamic image, etc.

[0034] The storage unit 43 also has a primary storage area (not shown) for temporarily storing the radiographic image transferred from the FPD 20. The storage unit 43 also has an image storage area (not shown) for storing the radiographic image transferred from the FPD 20 for a certain period of time in association with the accompanying information.

[0035] The communication unit 44 transmits and receives data via wired or wireless communication with the FPD 20. The communication unit 44 also transmits and receives data to and from external devices such as RIS and PACS via a communication network.

[0036] The driving unit 45 is a circuit that drives the tube of the radiation source of the radiation irradiation device. The driving unit 45 and the radiation source are connected via a cable.

[0037] The battery 46 supplies power to each part of the main body 10 and to the radiation source. The battery 46 can be charged externally via an AC cable.

[0038] The connector 47 is provided inside the housing portion and is electrically connected to the FPD 20 housed in the housing portion.

[0039] The charging unit 48 charges the FPD 20 connected via the connector 47 with power supplied from the battery 46 under the control of the imaging control unit 40 .

[0040] Next, the control of the shooting mode by the shooting control unit 40 will be described.

[0041] In conventional dynamic image capture, pulsed radiation is continuously emitted from the radiation source based on the synchronization signal from the start to the end of the capture, and a dynamic image consisting of a series of multiple frames is obtained.

[0042] However, when capturing a radiographic image, the total dose is limited in consideration of the radiation exposure dose of the subject. In particular, when capturing radiographic images outside of an imaging room, the total dose per imaging session is further limited from the perspective of risk management. Due to such limitations, the radiographic imaging system 1 cannot irradiate pulsed radiation over a relatively long period of time. Therefore, it is desirable to perform multiple imaging sessions as needed within a single imaging session, from the start to the end of imaging.

[0043] The radiation imaging system 1 according to the present embodiment has a normal imaging mode and an intermittent imaging mode as imaging modes including dynamic images. Fig. 3 is a diagram schematically showing pulse irradiation in the normal imaging mode. Fig. 4 is a diagram schematically showing pulse irradiation in the intermittent imaging mode.

[0044] As shown in Figure 3, the normal radiography mode is an imaging mode in which dynamic images are captured by continuously irradiating pulses from a radiation source during one imaging period from the start to the end of imaging. One imaging period in the normal radiography mode is the period during which continuous pulse irradiation continues for capturing dynamic images, and is set based on the total dose in one imaging period. In the normal radiography mode, dynamic images consisting of a series of multiple frames corresponding to the entire imaging period set in the normal radiography mode are acquired.

[0045] The intermittent imaging mode is an imaging mode that allows multiple capture of dynamic or still images captured by the FPD 20 during an imaging period from the start to the end of one imaging session. Specifically, the intermittent imaging mode is an imaging mode that alternates between radiation irradiation periods and non-irradiation periods so that there are at least two radiation irradiation periods during an imaging period from the start to the end of one imaging session. Note that the intermittent imaging mode is an imaging mode that is scheduled for at least two irradiation periods or that can have at least two irradiation periods. Therefore, for example, if one imaging period ends before the start of the second irradiation period due to some factor, such as a relationship with the total dose, imaging may end after only one irradiation period, even in the intermittent imaging mode.

[0046] The radiation irradiation period is a period during which at least one of dynamic images and still images is captured. The radiation non-irradiation period is a period during which at least one of dynamic images and still images is not captured, such as a period during which the rotating anode is left standing by while rotating.

[0047] For example, the period during which continuous pulse irradiation is performed in dynamic imaging corresponds to the radiation irradiation period. Furthermore, the period during which no pulse irradiation is performed in still and dynamic imaging corresponds to the non-radiation period. The period during which no pulse irradiation is performed does not include the low period during the period during which continuous pulse irradiation is performed in dynamic imaging. The low period is the period between two adjacent pulses during the period during which continuous, regular, or periodic pulse irradiation is performed.

[0048] The imaging period from the start to the end of one imaging session in the intermittent imaging mode (hereinafter referred to as one imaging period) is, for example, the period during which a specific subject is ready to be imaged in the radiation imaging system 1. Therefore, if imaging of a specific subject is completed and another subject becomes ready to be imaged, the period during which the other subject is ready to be imaged is not included in one imaging period for imaging the specific subject. Furthermore, one imaging period may be a period set based on the total dose over at least two or more radiation irradiation periods, the examination time set for the specific subject, etc. Furthermore, one imaging period is a period that can be variable depending on the non-irradiation period of radiation.

[0049] Furthermore, if a specific subject is in a state where imaging is possible but the specific subject is in a state where imaging is not possible in the radiation imaging system 1, it is assumed that one imaging period for that imaging possible state has ended. An imaging impossible state is a state where imaging has ended in the radiation imaging system 1, a state where imaging has been stopped in the radiation imaging system 1, etc.

[0050] FIG. 4 shows an example in which two irradiation periods (periods for capturing dynamic images) and one non-irradiation period occur in one imaging period.

[0051] In normal imaging mode, after being notified of the start of imaging, the FPD 20 starts accumulating and reading out charges corresponding to the radiation when it detects radiation irradiation. When radiation is no longer detected for a predetermined time or longer, the FPD 20 recognizes that imaging has ended and stops accumulating and reading out charges.

[0052] In the intermittent imaging mode, the FPD 20 is notified of the start of one imaging period, and then, upon detecting radiation irradiation at the start of the irradiation period, starts accumulating and reading out charges corresponding to the radiation, and ends accumulating and reading out charges at the end of the irradiation period. The FPD 20 repeats this operation for each irradiation period. This operation makes it easier to determine the end of the irradiation period, i.e., one intermittent imaging session.

[0053] In the intermittent radiography mode, an image confirmation operation is performed during one radiography period to connect the radiographic images acquired during two or more irradiation periods. A summary image, which is a frame describing the radiographic conditions, may be inserted into the connecting portion of each radiographic image. The summary image may include information such as the radiographic conditions for the intermittent radiography used to capture the frame immediately prior to the connecting portion and the duration of the radiography interruption. A number of frames corresponding to the non-irradiation period may be inserted into the connecting portion of each radiographic image. The inserted frame may be, for example, a copy of the final frame, an all-black frame, or a frame of a predetermined pattern.

[0054] The image confirmation operation may also be an operation of separately saving multiple radiation images corresponding to multiple irradiation periods and confirming each of the multiple radiation images as an image of the examination result. This operation may be applied when there are unnecessary images among the multiple radiation images acquired during one imaging period, and the unnecessary images are deleted and the remaining images are managed as examination images. Note that the images captured in the intermittent imaging mode may be automatically linked and saved, or saved individually, by presettings or the like. In this case, the image confirmation operation described above is omitted.

[0055] The non-irradiation period includes a waiting period and an interruption period. The waiting period includes a period from the start of imaging in one imaging period until the start of the first irradiation period during which radiation irradiation is waited, and this period is also included. The waiting period also includes a period from the end of the final irradiation period in one imaging period during which imaging is waited for to end, and this period is also included. This waiting period may or may not be included in one imaging period.

[0056] An interruption period is a non-irradiation period between a predetermined irradiation period and the next irradiation period after the predetermined irradiation period, and is a period during which radiation irradiation is interrupted during one imaging period. For example, in the case of an examination in which three irradiation periods are scheduled during one imaging period, the non-irradiation period between the first and second irradiation periods and the non-irradiation period between the second and third irradiation periods correspond to interruption periods.

[0057] Next, detailed control of the intermittent shooting mode will be described.

[0058] In the above-mentioned intermittent photography mode, the irradiation period and non-irradiation period can be variably controlled based on the user's operation of the exposure switch 41 A. In other words, in the intermittent photography mode, the irradiation period and non-irradiation period within one photography period can be freely set by the user's operation.

[0059] In other words, the imaging control unit 40 variably controls the radiation irradiation period and non-irradiation period during intermittent imaging in the intermittent imaging mode, depending on whether the exposure switch 41A of the radiation irradiation device 30 is operated or not.

[0060] For example, assume that the exposure switch 41A is a switch that can be switched among three states: open, first stage, and second stage. The open state of the exposure switch 41A is assigned to a state in which the radiation irradiation device 30 is stopped. The first stage of the exposure switch 41A is assigned to a state corresponding to a non-irradiation period of radiation. The second stage of the exposure switch 41A is assigned to a state corresponding to an irradiation period of radiation.

[0061] For example, when a user switches the open exposure switch 41A to the first or second stage, the imaging control unit 40 controls the radiation irradiating device 30 to operate. When a user switches the open exposure switch 41A to the first or second stage, imaging begins for one imaging period.

[0062] When the exposure switch 41A is switched from the open position to the first position, the radiation irradiation device 30 completes preparation for irradiation and then waits for irradiation without irradiating radiation. In other words, the imaging control unit 40 controls the imaging period so that a non-irradiation period of radiation occurs after the start of imaging in one imaging period.

[0063] Here, if the exposure switch 41A remains at the first position, the imaging control unit 40 performs control to maintain the non-irradiation period. In other words, as long as the exposure switch 41A is at the first position, the non-irradiation period continues.

[0064] When the exposure switch 41A is switched from the first position to the second position, the radiation irradiation device 30 starts irradiating radiation. That is, the imaging control unit 40 controls the non-irradiation period to end and the radiation irradiation period to begin.

[0065] When the exposure switch 41A is switched from the open position to the second position, the radiation irradiation device 30 starts irradiating radiation after completing irradiation preparation. In other words, the imaging control unit 40 controls the radiation irradiation period to begin after the start of imaging in one imaging period.

[0066] Here, if the type of captured image is a dynamic image and the exposure switch 41A remains at the second stage, the imaging control unit 40 controls to maintain the radiation irradiation period. In other words, as long as the exposure switch 41A remains at the second stage, the radiation irradiation period continues and dynamic image capturing continues.

[0067] When the exposure switch 41A is switched from the second position to the first position, the radiation irradiation device 30 ends the irradiation of radiation and waits for further irradiation. That is, the imaging control unit 40 controls the radiation irradiation period to end and enter a non-radiation period.

[0068] Furthermore, when the type of captured image is a still image, the radiation irradiation device 30 irradiates the radiation necessary to capture the still image and then waits for radiation irradiation. That is, the imaging control unit 40 controls the radiation irradiation period to end and enter a radiation non-irradiation period. In other words, when a still image is to be captured, the imaging control unit 40 ends the still image capture based on the radiation irradiation time regardless of the operation of the exposure switch 41A.

[0069] In this case, the exposure switch 41A is at the second stage, but the exposure switch 41A may be automatically switched to the first stage, or a control may be performed to prompt the user to switch the exposure switch 41A. The control to prompt the user may be, for example, a control to display text information on the display unit 42 prompting the user to switch the exposure switch 41A to the first stage, or a control to output audio information prompting the user to switch the exposure switch 41A to the first stage.

[0070] In this way, in the intermittent imaging mode, radiation irradiation periods and non-radiation periods occur alternately by switching the exposure switch 41A between the first and second stages. The irradiation periods and non-radiation periods are each variably controlled based on the operation status of the exposure switch 41A.

[0071] Therefore, the non-irradiation period can be easily adjusted to match the timing of capturing a radiographic image (the start timing of the irradiation period) with the movement of the subject, and the irradiation period can also be easily adjusted to capture a dynamic image that fully captures the movement of the subject. As a result, the degree of freedom in imaging can be improved compared to a configuration in which the non-irradiation period and the irradiation period are fixed.

[0072] Furthermore, when capturing dynamic images, the imaging control unit 40 may determine the end of the dynamic images based on the number of frames of the dynamic images. In this case, the exposure switch 41A is at the second stage, but the exposure switch 41A may be automatically switched to the first stage, or control may be performed to prompt the user to switch the exposure switch 41A. The control to prompt the user is the same as the control when the still images are finished as described above.

[0073] In addition, the number of frames of dynamic images, which is the criterion for determining the end of dynamic images, can be set appropriately based on the total dose for all images taken in one shooting period and the minimum dose required for other radiological images in one shooting period.

[0074] Although the irradiation period can be variably controlled, if the number of frames of a single dynamic image becomes too large, the total dose for all images taken during a single imaging period will become high, which may affect the capture of other radiation images.

[0075] Therefore, by limiting the number of frames of a dynamic image taken at one time, it is possible to reliably take the planned number of radiographic images within one imaging period.

[0076] For example, dynamic images may be captured of a situation in which a subject is asked to move the examination area in various directions. For example, the subject is asked to move their wrist in a specific direction, and then repeatedly move it in a different direction. In this case, capturing all of the movements in a single irradiation period would require the time and effort of dividing the radiation image later. Since movement in one direction takes approximately five seconds, the maximum number of frames in a single irradiation period (for example, a maximum of 75 frames at 15 fps (maximum of 5 seconds)) can be set in advance, allowing the radiation period to be forcibly divided during imaging. This eliminates the need to divide the radiation image later.

[0077] Furthermore, when the radiation irradiation period begins, the imaging control unit 40 may distinguish between dynamic images and still images based on the imaging order in the intermittent imaging mode in the examination order, for example.

[0078] For example, suppose an examination order specifies that imaging is to be performed three times within one imaging period, the type of image captured the first time is a still image, and the types of image captured the second and third times are dynamic images.

[0079] In this case, the radiation image obtained when the exposure switch 41A is first set to the second position is a still image, and the radiation images obtained when the exposure switch 41A is set to the second position the second and third times are dynamic images.

[0080] An example of the state transition of the exposure switch 41A according to this examination order is shown in Fig. 5. In Fig. 5, the state of the exposure switch 41A transitions in the following order according to the user's operation: open, first step, second step, first step, second step, first step, second step, first step, open.

[0081] According to the above examination order, the radiation irradiation period when the exposure switch 41A is turned to the second position for the first time corresponds to the period for capturing a still image, and the radiation irradiation periods when the exposure switch 41A is turned to the second position for the second and third times correspond to the period for capturing a dynamic image.

[0082] Furthermore, when the radiation irradiation period begins, the imaging control unit 40 may distinguish between dynamic images and still images based on the setting of the operation unit 41, for example.

[0083] For example, before switching to the irradiation period using the exposure switch 41A, the user sets the type of captured image to a dynamic image or a still image via the operation unit 41. Based on this setting, the imaging control unit 40 distinguishes between a dynamic image and a still image.

[0084] In this case, if the type of captured image is set to a dynamic image, the radiographic image will be a dynamic image, and if the type of captured image is set to a still image, the radiographic image will be a still image.

[0085] Furthermore, when the operation unit 41 includes multiple types of exposure switches, such as a hand switch and a foot switch, the still images and the dynamic images may be assigned to different types of exposure switches.

[0086] Furthermore, to allow the user to recognize whether a dynamic image or a still image is being captured, the imaging control unit 40 may differentiate the transmission state for each type of imaging (dynamic image capture and still image capture) during the irradiation period. For example, when the type of imaging is transmitted by an audio output unit, the output sound (pitch, sound pattern, etc.) may be different for dynamic image capture and still image capture. When the type of imaging is transmitted by a visual transmission function such as a lamp, the visual state (color, light emission pattern, apparent shape, etc.) of the visual transmission function may be different for dynamic image capture and still image capture. When capturing a still image, if the exposure switch 41A is set to the second position for a certain period of time from a specific timing (e.g., irradiation start or completion) related to still image capture, the audio output unit may generate a warning sound. In this case, the display unit 42 may display a warning message. Furthermore, in capturing dynamic images with a limited number of frames, even if the exposure switch 41A is at the second stage for a certain period of time from a specific timing related to capturing dynamic images (such as the start or end of irradiation of the last frame), the audio output unit may generate a warning sound. In this case, the display unit 42 may display a warning message.

[0087] As described above, the types of radiation images can be easily distinguished through simple operations.

[0088] Furthermore, the imaging control unit 40 determines the end of intermittent imaging of radiographic images (radiation irradiation period) by switching the exposure switch 41A from the second position to the first position as described above, but determines the end of imaging for one imaging period based on an operation separate from the end of the imaging. In other words, the imaging control unit 40 determines the end of intermittent imaging in the intermittent imaging mode separately from determining the end of imaging for one imaging period.

[0089] The end of one imaging period may be when the exposure switch 41A is switched from the first or second stage to the open position (see FIG. 5), or when the time set for one imaging period has elapsed.

[0090] For example, when the necessary imaging is completed in one imaging period, the user switches the exposure switch 41A to the open position, in which case the imaging control unit 40 determines that imaging in one imaging period has ended.

[0091] Furthermore, suppose that the user has completed the necessary imaging in one imaging period and has set the exposure switch 41A to the first position, leaving the non-irradiation period in place. In this case, the imaging control unit 40 determines that imaging in one imaging period has ended when the time set for one imaging period has elapsed. In other words, the imaging control unit 40 determines that imaging in one imaging period has ended in accordance with the elapse of time during the non-irradiation period following the radiation irradiation period in the intermittent imaging mode.

[0092] For example, during one imaging period, a situation may arise where it is necessary to change the settings for capturing radiographic images, the remaining charge of the battery 46 becomes low, the subject is unable to continue capturing radiographic images, etc. In this case, it is necessary to stop capturing radiographic images in the intermittent imaging mode, so the user switches the exposure switch 41A to open.

[0093] This causes the imaging control unit 40 to determine the end of imaging for one imaging period. Specifically, if the imaging control unit 40 determines the end of imaging for one imaging period before the end of intermittent imaging in the intermittent imaging mode, the imaging control unit 40 applies the determination of the end of imaging for one imaging period and ends irradiation (imaging) by the radiation irradiation device 30. Furthermore, if the imaging control unit 40 determines the end of imaging for one imaging period before determining the end of intermittent imaging in the intermittent imaging mode, the imaging control unit 40 ends irradiation by the radiation irradiation device 30 without determining the end of intermittent imaging.

[0094] With this configuration, the determination of the end of intermittent photographing is omitted by determining the end of photographing for one photographing period, so that the photographing control unit 40 can be prevented from performing the determination process twice.

[0095] Also, there may be cases where the user accidentally switches the exposure switch 41A to the open position. In this case, if it is determined that the imaging for one imaging period has ended, the uncompleted imaging cannot be performed. Therefore, the imaging control unit 40 may cancel the determination to end imaging if an operation to switch the exposure switch 41A to the first or second position is performed within a predetermined time after determining that the imaging for one imaging period has ended. In other words, if a predetermined operation is performed after receiving a command to end imaging for one imaging period, the imaging control unit 40 may not determine that the imaging has ended, and may continue the non-irradiation period in the intermittent imaging mode.

[0096] In this way, one imaging period continues, and the state of the radiation irradiation device 30 transitions between the radiation irradiation period and the non-irradiation period, so that uncompleted imaging can be performed.

[0097] Furthermore, the imaging control unit 40 may control the display mode of the display unit 42 so that the user can distinguish between a radiation irradiation period and a radiation non-irradiation period. For example, the imaging control unit 40 controls the display unit 42 to display a notification such as an image or icon that allows the user to distinguish between a radiation irradiation period and a radiation non-irradiation period.

[0098] The display mode of the radiation irradiation period may be the same or different between the intermittent imaging mode and the normal imaging mode.

[0099] Furthermore, for example, a period during which radiation is being prepared for irradiation within one imaging period and a period outside one imaging period are periods during which radiation is not being irradiated, similar to the non-irradiation period of radiation, but are different from the non-irradiation period of radiation. Therefore, the imaging control unit 40 may change the display mode of the display unit 42 and the state of the status indicator (not shown) between the period during which radiation is being prepared for irradiation and the period outside one imaging period and the non-irradiation period of radiation.

[0100] The photographing control unit 40 may also control the display unit 42 or the like to display that the time set for one photographing period has been reached. For example, the photographing control unit 40 may display the number of seconds remaining until the time is reached on the display unit 42 or the like. The photographing control unit 40 may also change the display color or pattern of a status indicator or the like according to the number of seconds remaining until the time is reached.

[0101] The imaging control unit 40 may also control the display unit 42, tube monitor, etc. to display guide information such as operation guides for the operation unit 41, such as how to transition to a non-irradiation period and how to continue the non-irradiation period. The imaging control unit 40 may also control the display unit 42, etc. to display guide information for the end of imaging for one imaging period. The imaging control unit 40 may also display different guide information between the intermittent imaging mode and the normal imaging mode. The guide information need not be displayed in the normal imaging mode.

[0102] The imaging control unit 40 may also perform control so as to notify the user of information regarding the delay time when transitioning from a non-irradiation period to a radiation irradiation period.

[0103] The control for notifying the user may be, for example, a control for displaying a visual display on the display unit 42, such as a countdown display of the delay time, an hourglass display of the delay time, or a bar display of the delay time. The control for notifying the user may also be a control for outputting a sound when switching from a non-irradiation period to an irradiation period. The control for notifying the user may also be a control for displaying on a display unit (such as an LED) provided on the exposure switch 41A or the like. Notification of information regarding the delay time may be notification of the delay time itself. Furthermore, in consideration of ease of use, notification of information regarding the delay time may be performed only when the delay time is longer than the normal delay time. In this case, notification of information regarding the delay time may be notification of a change in the delay time, or notification of the level of the delay time (e.g., divided into three levels). Notification of information regarding the delay time may also be notification of information indicating whether the delay time has exceeded a predetermined threshold. In this case, notification may be performed only when the delay time exceeds the threshold. Furthermore, since the degree of requirement for delay in the timing of restarting irradiation differs depending on the imaging order, the threshold may be automatically set according to the imaging order.

[0104] In the intermittent imaging mode, the imaging period per session is longer than in the normal imaging mode, and therefore, control is implemented to deal with the longer imaging period (for example, rotor stop or re-rotation control), which may result in the delay time being inconsistent. In the intermittent imaging mode, irradiation is repeatedly suspended and resumed for medical purposes, so if the timing to resume irradiation is delayed, it may not be possible to image the subject in the desired condition. Therefore, by implementing control to notify the user of the delay time in advance, it becomes easier for the user to take measures such as resuming irradiation earlier in anticipation of the delay time.

[0105] Next, a description will be given of the flow of processing by the imaging control unit 40. Fig. 6 is a flowchart showing an example of the operation of the inspection processing by the imaging control unit 40. This control is started when the input imaging conditions are for the intermittent imaging mode.

[0106] As shown in FIG. 6, the imaging control unit 40 determines the start of imaging for one imaging period based on the operation of the exposure switch 41A and the imaging preparation completion state of the radiation imaging system 1 (step S101). Specifically, when the exposure switch 41A is pressed at least to the first position (it may be pressed to the second position), the imaging control unit 40 starts preparation for imaging and instructs devices that require preparation for imaging, such as the radiation irradiator 30 and FPD 20, to start preparation for imaging. Upon receiving this instruction, these devices prepare for imaging and notify the imaging control unit 40 that their preparation is complete. For example, the radiation irradiator 30 controls the heating state of the filament and the rotation state of the tube rotor to enable imaging. The imaging control unit 40 determines the start of imaging upon receiving a notification of completion of imaging preparation from the devices that require preparation for imaging. The imaging control unit 40 then determines whether the exposure switch 41A is pressed to the first position (step S102).

[0107] If the result of the determination is that the exposure switch 41A is at the first position (YES in step S102), the imaging control unit 40 controls the radiation irradiating device 30 to enter a non-irradiation period (step S103).

[0108] After step S103, the imaging control unit 40 determines whether the exposure switch 41A remains at the first position (step S104). If the result of the determination is that the exposure switch 41A remains at the first position (step S104, YES), the processing of step S104 is repeated.

[0109] On the other hand, if the exposure switch 41A is not at the first position (step S104, NO), the imaging control unit 40 determines whether or not the imaging period satisfies the imaging end condition (step S105). If the determination result shows that the imaging period does not satisfy the imaging end condition (step S105, NO), this means that the exposure switch 41A has been switched to the second position, and the process proceeds to step S106.

[0110] On the other hand, if the shooting period for one time satisfies the shooting end condition (step S105, YES), this control ends. Note that, if the shooting period for one time satisfies the shooting end condition while repeating the process of step S104, this control may end.

[0111] Returning to the determination in step S102, if the exposure switch 41A is not at the first position (step S102, NO), the imaging control unit 40 controls the radiation irradiating device 30 so that the radiation irradiation period begins (step S106).

[0112] After step S106, the imaging control unit 40 determines whether the exposure switch 41A remains at the second position (step S107). If the result of the determination is that the exposure switch 41A remains at the second position (step S107, YES), the processing of step S107 is repeated.

[0113] On the other hand, if the exposure switch 41A is not at the second position (step S107, NO), the imaging control unit 40 determines whether or not the imaging period satisfies the imaging end condition (step S108). If the determination result shows that the imaging period does not satisfy the imaging end condition (step S108, NO), this means that the exposure switch 41A has been switched to the first position, and the process proceeds to step S103.

[0114] On the other hand, if the shooting period for one time satisfies the shooting end condition (step S108, YES), this control ends. Note that, if the shooting period for one time satisfies the shooting end condition while the process of step S107 is being repeated, this control may be ended.

[0115] According to the present embodiment configured as described above, the radiation irradiation device 30 is controlled in the intermittent imaging mode, so that the period required for observation can be set as the irradiation period, and the other period can be set as the non-irradiation period.

[0116] This allows radiographic images to be taken for the required period, and radiation is not irradiated to the subject during other periods, so that in the intermittent radiography mode, an increase in the subject's radiation exposure can be suppressed. Furthermore, because the increase in tube temperature and the load per unit time on the tube and generator can be suppressed, the resulting restrictions on a single radiography session (e.g., the maximum time for a single radiography session, the maximum number of irradiation pulses per radiography session, etc.) can be alleviated compared to the normal radiography mode. In other words, radiographic images for the required period can be obtained with easy-to-use operations, while minimizing the restrictions on radiography caused by the device and suppressing an increase in the subject's radiation exposure.

[0117] Furthermore, the end of intermittent shooting in the intermittent shooting mode is determined separately from the determination of the end of one shooting period. In other words, the end of one shooting period and the end of intermittent shooting in the intermittent shooting mode are distinguished. Therefore, for example, a non-irradiation period can be set after the end of intermittent shooting, or the end of one shooting period can be set after the end of intermittent shooting, thereby improving the degree of freedom after the end of intermittent shooting.

[0118] Furthermore, since the non-irradiation period and irradiation period of radiation are variably controlled depending on the operation status of the exposure switch 41A, the necessary period can be set as the irradiation period without omission, and the non-irradiation period can be continued until the necessary period is reached. As a result, radiation images for the necessary period can be obtained with easy-to-use operations while suppressing an increase in the subject's exposure dose.

[0119] In the above embodiment, the end of imaging for one imaging period is determined based on the operation (input information) of the operation unit 41 (exposure switch 41A), but the present invention is not limited to this. For example, the imaging control unit 40 may determine the end of imaging for one imaging period based on information about imaging performed within one imaging period.

[0120] The information about imaging performed within one imaging period may be, for example, the number of radiographic images taken, the maximum number of frames based on the frame rate and the dose per frame (kV, mAs, etc.), the total dose, the total time for intermittent imaging, or the elapsed time for one imaging session. The total time for intermittent imaging may be the cumulative elapsed time for all irradiation periods that have been performed. The elapsed time for one imaging session may be the elapsed time from the start of imaging for one imaging period, in other words, the cumulative elapsed time for all irradiation periods and non-irradiation periods that have been performed. Furthermore, the information about imaging performed within one imaging period may be a combination of two or more of these.

[0121] For example, if the total dose due to imaging within one imaging period becomes relatively large, the radiation exposure of the subject increases, and therefore it is necessary to impose a limit on the total dose. Therefore, when the number of images taken or the total dose reaches a predetermined threshold, the imaging control unit 40 may determine that one imaging period has ended.

[0122] By doing this, when the amount of photography performed within one photography period reaches the limit, the end of photography for one photography period is determined, so that intermittent photography beyond the limit can be prevented.

[0123] Furthermore, the photographing control unit 40 may determine the end of one photographing period based on both the input information to the operation unit and the information on photographing performed during one photographing period.

[0124] For example, suppose a first threshold and a second threshold greater than the first threshold are set for the number of radiographic images captured (information about radiography performed during one radiographic period). When the number of radiographic images captured is equal to or greater than the first threshold and less than the second threshold, the radiography control unit 40 displays a warning on the display unit 42 or the like indicating that the upper limit for the number of radiographic images is being reached, and determines the end of one radiographic period based on information input to the operation unit (opening of the exposure switch 41A). When the number of radiographic images captured reaches or exceeds the second threshold, the radiography control unit 40 determines the end of one radiographic period even if the exposure switch 41A is not opened.

[0125] In the above embodiment, the end of imaging for one imaging period is determined based on the operation of the exposure switch 41 A. That is, the end of imaging for one imaging period is determined by the operation of opening the exposure switch 41 A. However, the present invention is not limited to this, and for example, the end of imaging may be determined based on the operation of an operation unit other than the exposure switch 41 A.

[0126] For example, the imaging control unit 40 may determine the end of imaging for one imaging period based on the operation status of an operation button displayed on the display unit 42 that can display radiographic images being captured in the intermittent imaging mode.

[0127] 7 shows an example of a display screen of the display unit 42. The display unit 42 is provided with an imaging order list 42A, an image display field 42B, an imaging start button 42C, an examination end button 42D, and the like.

[0128] The imaging order list 42A is a list of imaging orders included in the examination order information of the selected examination. The imaging order includes the imaging region, imaging direction, classification of still image / dynamic image, etc.

[0129] The image display field 42B is a field for displaying the captured image. Before capturing an image, information indicating the status of the system, such as "Capture is possible," is displayed in the image display field 42B.

[0130] The shooting start button 42C is a button for issuing an instruction to start shooting, for example, in an intermittent shooting mode, etc. In other words, the shooting start button 42C is a button for issuing an instruction to start shooting for one shooting period.

[0131] The examination end button 42D is a button for instructing the end of the examination, that is, the examination end button 42D is a button for instructing the end of imaging for one imaging period.

[0132] First, the user selects a photography order from the photography order list 42A on the display unit 42 by operating the operation unit 41, and performs photography preparations such as positioning. When a photography order in the intermittent photography mode is selected by operating the operation unit on the main body 10, the photography control unit 40, in conjunction with that operation, displays text information such as "Photographing is now possible" on the display unit 42 and activates the photography start button 42C.

[0133] When the user presses the imaging start button 42C by operating the operation unit 41, each device, such as the radiation irradiation device 30 and the FPD 20, prepares for operation. The preparation for operation of each device may start based on the timing when an imaging order in the intermittent imaging mode is selected (simultaneously with the timing or a predetermined time after the timing), rather than by pressing the operation start button 42C. After the preparation for operation of each device is complete, imaging for one imaging period begins. In conjunction with this operation, the display of the imaging start button 42C on the display unit 42 is dimmed, and the imaging start button 42C cannot be operated.

[0134] Depending on the operation of the exposure switch 41A, during imaging and when imaging is interrupted, text information "imaging in progress" and text information "imaging interrupted" may be displayed on the display unit 42. In other words, the imaging control unit 40 may notify the user of information indicating that imaging is in progress or when imaging is interrupted based on the user's operation of the operation unit 41. The display of these text information may be switched in conjunction with switching between radiation irradiation periods and non-radiation periods.

[0135] When the examination is completed, the user presses the examination end button 42D on the display screen of the display unit 42 by operating the operation unit 41. This causes the imaging control unit 40 to determine that imaging for one imaging period has ended.

[0136] This makes it easier to distinguish between determining the start and end of imaging for one imaging period based on the operation buttons on the display unit 42 and determining the start and end of intermittent imaging based on the exposure switch 41A.

[0137] Furthermore, it may be possible to operate the photographing order list 42A during one photographing period. For example, in order to be able to switch the display on the display unit 42 to images that have already been photographed by intermittent photographing, it may be possible to operate the photographing order list 42A during one photographing period.

[0138] Furthermore, the end of imaging for one imaging period may occur after an image confirmation operation is performed in the intermittent imaging mode. In other words, the imaging control unit 40 may determine the end of imaging for one imaging period after the end of intermittent imaging in the intermittent imaging mode and after receiving a command to confirm the images captured by the radiation imaging system 1 from the start of imaging for one imaging period to the end of intermittent imaging.

[0139] The image confirmation operation may be, for example, an operation such as pressing a button indicating image confirmation displayed on the display unit 42 or the like.

[0140] In the above embodiment, the first stage of the exposure switch 41A is assigned to a non-irradiation period, and the second stage of the exposure switch 41A is assigned to a radiation irradiation period, but the present invention is not limited to this. For example, the opening of the exposure switch 41A may be assigned to a non-irradiation period. In other words, the imaging control unit 40 may determine the end of intermittent imaging in the intermittent imaging mode and the end of imaging for one imaging period based on the same operation (the operation of opening the exposure switch 41A).

[0141] Specifically, once the radiation irradiation period has begun, the exposure switch 41A is opened, thereby entering a non-radiation period. If the user operates the exposure switch 41A to the second position before the non-radiation period continues for a predetermined time (e.g., 60 seconds), the imaging control unit 40 enters the radiation irradiation period. Note that the predetermined time may be measured by monitoring a measuring device (not shown) such as a timer.

[0142] Depending on the type of switch, the exposure switch 41A may not be able to maintain its state unless the user keeps pressing the first and second stages. Therefore, if the first and second stages of the exposure switch 41A are set to the non-irradiation period and irradiation period of radiation, one of the user's hands will be occupied and the user will not be able to perform other tasks.

[0143] In contrast, in this embodiment, once the radiation irradiation period has begun, the exposure switch 41A is opened, which enters a non-radiation period, allowing the user to release the exposure switch 41A. Therefore, during the non-radiation period, the user can perform other tasks for a predetermined period of time. The other tasks may be any tasks related to radiographic imaging, such as determining whether imaging was successful, changing positioning, preparing contrast media, etc.

[0144] In this embodiment, imaging for one imaging period may start when, for example, the first stage of the exposure switch 41A is pressed. In this case, the radiation irradiating device 30 may wait for irradiation after preparation for irradiation, and when the second stage of the exposure switch 41A is pressed, the radiation irradiating device 30 may start irradiating radiation.

[0145] Furthermore, the imaging control unit 40 may determine that imaging for one imaging period has ended when a non-irradiation period of radiation continues for a predetermined period during intermittent imaging in the intermittent imaging mode.

[0146] As a result, the exposure switch 41A remains open for a relatively long time, and the imaging control unit 40 automatically determines that imaging for one imaging period has ended, thereby improving ease of use for the user.

[0147] Furthermore, the imaging control unit 40 may extend the predetermined time to continue the non-irradiation period based on a specific operation. The specific operation may be turning the exposure switch 41A to the first position or an operation on the user interface of the radiation imaging system 1 (for example, pressing the imaging continuation button).

[0148] This makes it possible to prevent the end of image capture when the user takes time to perform other tasks and the predetermined time has elapsed.

[0149] In this embodiment, once the radiation irradiation period has begun, the opening of the exposure switch 41A is assigned to the non-radiation period, but this is not limiting. For example, in addition to the opening of the exposure switch 41A, the first stage of the exposure switch 41A may be assigned to the non-radiation period.

[0150] According to this, by setting the non-irradiation period to the first stage of the exposure switch 41A, it is possible to prevent the non-irradiation period of radiation from being judged to be the end of imaging for one imaging period, for example, when the non-irradiation period of radiation continues for a predetermined time.

[0151] Furthermore, in the above embodiment, one type of exposure switch is provided, but the present invention is not limited to this, and multiple types of exposure switches (operation units) may be provided.

[0152] For example, the configuration shown in Fig. 8 includes a first exposure switch 41A and a second exposure switch 41B. The first exposure switch 41A is similar to the exposure switch 41A in the above embodiment.

[0153] The second exposure switch 41B is a foot switch that can be operated by the user's foot.

[0154] In this embodiment, for example, operation of the second exposure switch 41B may be an operation indicating one imaging period. That is, operation of the second exposure switch 41B starts imaging for one imaging period, and release of the operation of the second exposure switch 41B ends imaging for one imaging period. In other words, the imaging control unit 40 controls so that one imaging period continues and a non-irradiation period occurs while one of the two types of operation units is operated. Then, the imaging control unit 40 controls so that a radiation irradiation period occurs while one of the two types of operation units is operated.

[0155] In this way, the non-irradiation period can be initiated simply by operating the second exposure switch 41B, and when the non-irradiation period begins, the user can release the first exposure switch 41A, allowing the above-mentioned other tasks to be performed during the non-irradiation period.

[0156] In this embodiment, the operation of the second exposure switch 41B is an operation indicating that one imaging period has begun, and the operation of the first exposure switch 41A is an operation related to the radiation irradiation period, but this is not limiting. For example, the operation of the first exposure switch 41A may be an operation indicating that one imaging period has begun, and the operation of the second exposure switch 41B may be an operation related to the radiation irradiation period.

[0157] In this embodiment, multiple users can operate the exposure switches 41A and 41B. In the radiation imaging system 1, the user instructs the subject on how to move during the non-irradiation period, and observes the subject's movements during the irradiation period to determine the timing to switch from the irradiation period to the non-irradiation period.

[0158] Since instructions to the subject on how to move and observation of the subject's movements can be performed by users other than the photographer, such as a doctor or a radiologist, it is conceivable that an examination will be performed by multiple users (instructor, observer, photographer). Therefore, a system that can be efficiently operated by multiple users is desired.

[0159] The roles of the start and end of each shot within all the shots in one shooting period vary depending on the purpose of the shot. All shots correspond to all irradiation periods within one shooting period. Individual shots correspond to each irradiation period within one shooting period.

[0160] For example, one possible division of roles is that a doctor performs operations to start and end individual imaging, and a radiologist performs operations to start and end all imaging.

[0161] The purpose of this role sharing may be, for example, to quickly and precisely coordinate the start and end of each imaging session. For example, a subject with tremors may be unable to start and end the desired movement at the intended timing due to joint movements or functional movements of a subject with weakened muscles. In such cases, it is difficult to synchronize the subject's movements with the start and end of imaging. Therefore, in such cases, the user (doctor) who instructs the subject on movements and observes the subject's movements performs the operations to start and end each imaging session. It is preferable that the doctor's operation be an exposure switch, such as a foot switch, so that the doctor can use his or her hands.

[0162] As another example, a role division may be considered in which a radiologist performs an operation to start each imaging operation, and a doctor performs an operation to end each imaging operation.

[0163] The purpose of imaging in this role sharing may be, for example, to reliably capture an image of the transition of the subject's movement from not moving to starting to move. In such imaging, the possibility of imaging failure may be reduced by starting each imaging session with a relatively generous timing rather than timing it to coincide with the start of the subject's movement. On the other hand, since it may be difficult to confirm the end of the subject's movement without observing the subject closely, it may be more appropriate for the observer to determine the end. If a doctor (observer) were to start and end each imaging session, the doctor's workload would be heavy. Therefore, the doctor may only be responsible for the operation of ending each imaging session.

[0164] Furthermore, the operation to end each imaging session may be performed by both the doctor and the radiologist.

[0165] The end of each imaging session may not be determined solely by the subject's movements. For example, an individual imaging session may be terminated due to an abnormality in the positioning of the device during imaging. Furthermore, an individual imaging session may be terminated if an inadequacy in the imaging conditions is detected during imaging, an abnormality that can be determined from the radiographic image displayed on the display unit 42 during imaging. These abnormalities are often noticed by a radiologist located near the display unit of the radiography system 1 or who is responsible for setting the imaging conditions. Therefore, it is preferable that the radiologist also be able to terminate each imaging session. In this case, the timing of the end of each imaging session is determined by the earlier of the doctor's and radiologist's instructions to terminate.

[0166] In order to allow a plurality of users to operate the exposure switches 41A and 41B in this way, the roles of the exposure switches 41A and 41B can be set as follows (A) to (G), for example.

[0167] (A) All imaging in one imaging period and all individual imaging are performed using the second exposure switch 41B (foot switch), and the first exposure switch 41A (hand switch) is disabled.

[0168] (B) All imaging is started and ended by the first exposure switch 41A, and individual imaging is started and ended by the second exposure switch 41B. This allows, for example, a doctor to move freely during both radiation irradiation and non-irradiation periods. Also, it is possible for a radiologist to be responsible for the overall imaging operation (including, for example, setting irradiation conditions and preparations), while a doctor is responsible for the imaging timing related to the principle.

[0169] (C) In (B) above, instructions may be given by, for example, holding down the second exposure switch 41B with the foot during each imaging period. In other words, exposure is performed during the period when both the first exposure switch 41A and the second exposure switch 41B are operated, thereby improving safety. In addition, work efficiency is improved because the doctor can move freely during periods when radiation is not being irradiated.

[0170] (D) In ​​(B) above, instructions may be given by holding down the second exposure switch 41B with the foot during non-irradiation periods. The doctor only needs to give instructions to suspend exposure (to end each individual imaging session), which reduces the psychological burden on the doctor regarding the responsibility of exposure.

[0171] (E) The operations to start and end all imaging and the operations to start and end individual imaging are performed by the first exposure switch 41A, and the operations to end individual imaging are also performed by the second exposure switch 41B. For the end of each imaging, the operation of the first exposure switch 41A or the second exposure switch 41B, whichever is operated first, is applied.

[0172] (F) In addition to the above (E), the operation to end all imaging may also be performed by the second exposure switch 41B. Because doctors have a better understanding of the series of procedure switching than radiologists, (F) is suitable for a configuration in which all imaging is ended by switching the series of procedures.

[0173] (G) The operations to start and end all imaging and the operation to start each individual imaging are performed by the first exposure switch 41A, and the operation to end each individual imaging is performed by the second exposure switch 41B.

[0174] In the above embodiment, the imaging conditions are not changed during one imaging period, but the present invention is not limited to this. For example, the imaging control unit 40 may change the imaging conditions during one imaging period (e.g., during a period when radiation is not being applied).

[0175] In this case, the imaging control unit 40 may change the imaging conditions related to the restrictions on radiographic images throughout one imaging period, depending on the changes in the imaging conditions. Specifically, the imaging control unit 40 may change at least one of the total number of radiographic images that can be captured and the total imaging time throughout one imaging period, depending on the changes.

[0176] For example, the imaging control unit 40 may change the imaging conditions so that when the frame rate is 15 fps, the total number of frames becomes 300, and when the frame rate is 6 fps, the total number of frames becomes 240. In this case, the imaging control unit 40 may display information about the parameters before and after the change side by side on the display unit 42 or the like.

[0177] Furthermore, the imaging control unit 40 may change the imaging conditions related to radiation irradiation throughout one imaging period, depending on the changes in the imaging conditions. Specifically, the imaging control unit 40 may change the imaging conditions so as to reduce the total number of images to be captured compared to before the change, so as not to increase the total dose throughout one imaging period. Furthermore, if the irradiation time or the like is reduced compared to before the change, the imaging control unit 40 may change the imaging conditions so as to increase the total number of images to be captured compared to before the change.

[0178] Furthermore, the imaging control unit 40 may adjust the imaging conditions according to the changes in the imaging conditions. Specifically, the imaging control unit 40 may adjust the imaging conditions so that the total number of images and the total imaging time are the smallest between the imaging conditions before and after the change. This prevents the total dose from increasing even if the imaging conditions are changed, thereby suppressing an increase in the radiation exposure dose caused by the change in the imaging conditions.

[0179] Furthermore, the imaging control unit 40 may not change some of the imaging conditions to be changed depending on the changes in the imaging conditions. Specifically, when the imaging condition to be changed is the frame rate, the imaging control unit 40 may not change the total number of images to be captured from before the change. This is because if the total number of images to be captured remains the same, the radiation exposure amount also remains the same.

[0180] Furthermore, the imaging control unit 40 may change the waiting time when imaging is resumed after the imaging conditions are changed, depending on the changes in the imaging conditions.

[0181] Furthermore, the photographing control unit 40 may change the photographing conditions based on the consistency between the change in the photographing conditions and the specific conditions. Specifically, when changing the photographing conditions, the photographing control unit 40 may change the photographing conditions only if the specific conditions are satisfied.

[0182] For example, if the change in the imaging conditions results in a lower dose than the imaging conditions before the change, the imaging control unit 40 changes the imaging conditions. Also, if the change in the imaging conditions is a frame rate, the imaging control unit 40 changes the imaging conditions.

[0183] Furthermore, the imaging control unit 40 changes the imaging conditions when the change target of the imaging conditions is an operation related to a positioning change. Furthermore, the imaging control unit 40 may not change the imaging conditions when the change target of the imaging conditions is a radiation generation parameter (e.g., tube voltage, tube current time product, etc.).

[0184] Furthermore, the imaging control unit 40 may end imaging for one imaging period when it detects a specific positioning change operation and a geometric change in irradiation. The specific positioning change operation may be, for example, an operation that changes the angle of the tube relatively significantly. The geometric change in the irradiation field may be, for example, a change in the collimator that opens or closes significantly.

[0185] Furthermore, the imaging control unit 40 may change the imaging conditions only when the imaging condition change target is a specific irradiation condition parameter. For example, the imaging control unit 40 may not change the imaging conditions when the specific irradiation condition parameter is tube voltage, and may change the imaging conditions when the specific irradiation condition parameter is tube current, irradiation time, or tube current-time product. Furthermore, the imaging control unit 40 may change the imaging conditions when the specific irradiation condition parameter is a change in an additional filter.

[0186] Furthermore, if a parameter range different from the parameter range that can be set at the start of one imaging period is set, the imaging control unit 40 may change the imaging conditions only to those conditions within the different parameter range. For example, if the range is narrower than the parameter range at the start, the imaging control unit 40 may change the imaging conditions.

[0187] Furthermore, the imaging control unit 40 may change the imaging conditions if the total radiation dose during one imaging period does not exceed a specified value due to the changed imaging conditions. Furthermore, the imaging control unit 40 may change the imaging conditions if the number of changes to the imaging conditions is equal to or less than a predetermined number.

[0188] Furthermore, the imaging control unit 40 may determine the end of imaging for one imaging period if the imaging conditions are changed during one imaging period (such as during a non-irradiation period). This makes it possible to prevent the total dose during the entire imaging period from exceeding a specified value. In this case, after imaging for one imaging period is completed, the imaging control unit 40 may set the changed imaging conditions as the imaging conditions for the next imaging period. This allows for a quick transition to the next imaging period.

[0189] Furthermore, if the imaging conditions are changed during one imaging period (e.g., during a non-irradiation period), the imaging control unit 40 may continue imaging under the original imaging conditions without changing the imaging conditions. This makes it possible to prevent the total dose over one imaging period from exceeding a specified value. However, since the imaging conditions have not been changed, the imaging control unit 40 may notify the user that the imaging conditions have not been changed. Examples of methods for notifying the user include changing the display color of parameter operation buttons for the tube voltage, tube current, tube current time product, irradiation time, etc.

[0190] Furthermore, during one imaging period, settings that are different from those at the start of imaging may be performed during periods when radiation is not being irradiated.

[0191] For example, suppose an additional filter is switched or removed. In this case, information indicating that the additional filter has been switched is input to the imaging control unit 40 by a notification from the radiation irradiation device 30 or a selection operation by a radiologist. The imaging control unit 40 applies the change to the settings of the imaging conditions based on this input. In other words, if there is an input indicating a predetermined change during one imaging period, the imaging control unit 40 applies the predetermined change to the settings of the imaging conditions.

[0192] Furthermore, during the non-irradiation period, an operation to play back radiographic images captured during intermittent radiography after radiography has ended may be performed. In this case, the radiography control unit 40 may play back radiographic images captured during the radiography period according to a preset setting. Specifically, the radiography control unit 40 may apply a playback operation if the radiographic images can be played back during the radiography period, and may not apply a playback operation if the radiographic images cannot be played back during the radiography period.

[0193] Furthermore, when the radiation imaging system 1 receives a notification that the information on the battery 46 of the radiation imaging system 1 is below a certain value during a non-irradiation period, the imaging control unit 40 may notify the user in accordance with the remaining charge of the battery 46. For example, if the remaining charge of the battery 46 falls below a threshold, imaging may not be able to continue, so the imaging control unit 40 notifies the user. Furthermore, for example, if the imaging control unit 40 is set not to notify the user, the imaging control unit 40 may not notify the user. Furthermore, in addition to the information on the battery 46, for example, the battery information of the FPD 20 may also be used to notify the user.

[0194] Furthermore, in the above embodiment, no particular mention is made of the control of the radiation irradiating device 30 and the like, but various controls may be changed depending on, for example, the imaging mode.

[0195] For example, at least one of the filament heating control and the tube rotor control may be controlled in a different manner depending on whether a still image is being captured, a dynamic image is being captured in the normal capture mode, or a dynamic image is being captured in the intermittent capture mode.

[0196] For example, the tube rotor may not be controlled to rotate again when capturing still images, but may be controlled to rotate again when capturing dynamic images in the normal shooting mode and the intermittent shooting mode.Furthermore, the tube rotor may not be controlled to rotate again when capturing still images and dynamic images in the normal shooting mode, but may be controlled to rotate again when capturing dynamic images in the intermittent shooting mode.

[0197] The rotation of the tube rotor and the heating of the filament may be continued immediately after the state of the radiation imaging system 1 transitions to a non-irradiation period. If the non-irradiation period continues for a relatively long time, the rotation of the tube rotor and the heating of the filament may be stopped.

[0198] Furthermore, the re-rotation control of the tube rotor and the heating control of the filament may not be performed periodically, but may be performed during a non-irradiation period or when transitioning from a non-irradiation period to an irradiation period.

[0199] In addition, in controlling at least one of the dose area product (DAP), calculated DAP, and incident dose calculation, in the intermittent photography mode, values ​​may be separated for still images and dynamic images, or values ​​may be acquired for each intermittent photography unit. Calculated DAP is a method of calculating the dose area value instead of using an area dosimeter.

[0200] In addition, in the control of at least one of the DAP, the calculated DAP, and the incident dose calculation, the control may be switched between capturing still images, capturing dynamic images in the normal imaging mode, and capturing dynamic images in the intermittent imaging mode.

[0201] For example, when capturing still images and dynamic images in normal shooting mode, values ​​are acquired for each shooting unit, but when capturing dynamic images in intermittent shooting mode, values ​​may be acquired for each intermittent shooting unit.

[0202] In the above embodiment, the multiple shots in the intermittent shooting mode include at least one dynamic image shot and at least one still image shot, but the present invention is not limited to this. For example, the multiple shots in the intermittent shooting mode may include only dynamic image shots or only still image shots.

[0203] In the above embodiment, the radiation imaging control device is the radiation imaging system 1 including the radiation imaging unit (radiation irradiation device 30), but the present invention is not limited to this. For example, the radiation imaging control device may be disposed in an operation room separate from the radiation imaging unit.

[0204] Furthermore, the above-described embodiments are merely examples of specific embodiments for carrying out the present invention, and the technical scope of the present invention should not be construed as being limited by these embodiments. In other words, the present invention can be carried out in various forms without departing from the gist or main features thereof. [Explanation of symbols]

[0205] 1 Radiography system 2. PACS 3 HIS 4 RIS 10 Main Unit 20 FPD 30 Radiation irradiation equipment 40 Shooting control unit 41 Operation section 41A Exposure switch (first exposure switch) 41B Second exposure switch 42 Display section 43 Storage section 44 Communications Department 45 Drive unit 46 Battery 47 Connector 48 Live parts

Claims

1. A radiation imaging control device that controls a radiation imaging unit capable of capturing a radiation image by irradiating radiation, an imaging control unit that controls the radiation imaging unit in an intermittent imaging mode that allows dynamic images or still images to be captured by the radiation imaging unit multiple times during an imaging period from the start to the end of one imaging session; the imaging control unit determines the end of imaging for the single imaging period based on a predetermined condition; Radiography control device.

2. the photographing control unit determines the end of intermittent photographing in the intermittent photographing mode separately from the determination of the end of photographing in the one photographing period; The radiography control device according to claim 1 .

3. the imaging control unit variably controls a non-irradiation period in the intermittent imaging mode according to an operation maintenance status of an operation unit of the radiation imaging unit; The radiography control device according to claim 1 .

4. the imaging control unit variably controls a radiation irradiation period in the intermittent imaging mode according to an operation maintenance status of an operation unit of the radiation imaging unit. The radiography control device according to claim 1 .

5. the imaging control unit determines that imaging for one imaging period has ended when a non-irradiation period of radiation continues for a predetermined time in the intermittent imaging mode. The radiography control device according to claim 1 .

6. the imaging control unit extends the predetermined time based on a specific operation to continue the non-irradiation period of radiation; The radiography control device according to claim 5 .

7. the imaging control unit determines the end of imaging for one imaging period according to the elapsed time during a non-irradiation period following a radiation irradiation period in the intermittent imaging mode. The radiography control device according to claim 1 .

8. the photographing control unit determines, based on the same operation, the end of the intermittent photographing in the intermittent photographing mode and the end of the photographing in one photographing period; The radiography control device according to claim 2 .

9. after the intermittent photographing in the intermittent photographing mode is completed, the photographing control unit acquires a command to confirm images photographed by the radiation photographing unit from the start of the photographing in one photographing period to the end of the intermittent photographing, and then determines the end of the photographing in one photographing period. The radiography control device according to claim 2 .

10. the imaging control unit, when a predetermined operation is performed after acquiring a command to end the imaging for the one imaging period, does not determine the end of the imaging, and continues a non-irradiation period of radiation in the intermittent imaging mode. The radiography control device according to claim 1 .

11. the imaging control unit controls the radiation imaging unit so that the dynamic image and the still image are each included at least once in the multiple imaging operations in the intermittent imaging mode. The radiography control device according to claim 1 .

12. when capturing the still image, the imaging control unit determines the end of capturing the still image based on the radiation irradiation time, regardless of the operation of the operation unit of the radiation imaging unit. The radiography control device according to claim 1 .

13. When the dynamic image is captured, the imaging control unit determines the end of capturing the dynamic image based on the number of frames of the dynamic image. The radiography control device according to claim 1 .

14. when the imaging control unit determines that the imaging for one imaging period has ended before determining that the intermittent imaging in the intermittent imaging mode has ended, the imaging control unit applies the determination that the imaging for one imaging period has ended to end imaging by the radiation imaging unit. The radiography control device according to claim 2 .

15. the imaging control unit determines the end of imaging for the single imaging period based on at least one of input information to an operation unit of the radiation imaging unit and information on imaging performed within the single imaging period; The radiography control device according to claim 1 .

16. When the imaging control unit determines that the imaging for one imaging period has ended before determining that the intermittent imaging in the intermittent imaging mode has ended, the imaging control unit ends the imaging by the radiation imaging unit without determining that the intermittent imaging has ended. The radiography control device according to claim 14.

17. the imaging control unit determines the end of imaging for one imaging period based on an operation status of an operation button displayed on a display unit capable of displaying the radiographic image being captured in the intermittent imaging mode. The radiography control device according to claim 1 .

18. the intermittent photography mode is a photography mode in which a radiation irradiation period, which is a period for capturing at least one of the dynamic image and the still image, and a radiation non-irradiation period, which is a period for not capturing at least one of the dynamic image and the still image, are alternately generated so that the radiation irradiation period, which is a period for capturing at least one of the dynamic image and the still image, occurs at least twice during one photography period; The radiography control device according to claim 1 .

19. Radiography department and The radiography control device according to claim 1 ; A radiography system comprising:

20. A program for a radiography control device that controls a radiography unit capable of capturing a radiographic image by irradiating radiation, On the computer, a process of controlling the radiographic imaging unit in an intermittent imaging mode in which dynamic images or still images captured by the radiographic imaging unit can be captured multiple times during an imaging period from the start to the end of one imaging session; A process of determining the end of the imaging for one imaging period based on a predetermined condition; Execute program.

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