Radiography system, imaging control device, and radiation imaging method

Abstract

When performing two-stage radiographic imaging, pre-imaging and main imaging, the system will be able to handle both types of imaging, which have different imaging attributes and therefore different rates of failure, using the same equipment. Furthermore, it will ensure that users can reliably understand whether or not a pre-imaging image is displayed after pre-imaging. [Solution] The radiography system 100 includes an imaging control means that controls the system to perform pre-imaging with a pre-dose lower than the main dose before performing the main imaging, and a condition derivation means that derives the imaging conditions for the main imaging based on the pre-image obtained from the pre-imaging, and further includes a mode switching means that switches the control mode of the imaging control means to a pre-image confirmation mode that displays the pre-image after pre-imaging, or a short-time imaging mode that performs the main imaging without displaying the pre-image after pre-imaging, and a mode notification means that notifies which control mode the imaging control means is controlling in.

Description

Technical Field

[0001] The present invention relates to a radiation imaging system, an imaging control device, and a radiation imaging method.

Background Art

[0002] In a radiation imaging system that performs two-stage radiation imaging in which an appropriate irradiation dose in the main imaging is derived based on a radiation image (pre-image) obtained in a pre-imaging performed prior to the main imaging, and the main imaging is performed with the derived irradiation dose, various techniques have been proposed in recent years. For example, Patent Document 1 describes a technique for automatically determining whether pre-imaging was appropriately performed by performing image analysis on a pre-image, a technique for displaying a pre-image for allowing a user to determine whether pre-imaging was appropriately performed, a technique for presetting whether to display a pre-image, and a technique for displaying a pre-image when it is automatically determined that pre-imaging was not appropriately performed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in radiation imaging, depending on differences in imaging attributes (imaging site, subject characteristics, etc.), there is a difference in the possibility of imaging failure (performing the main imaging in an inappropriate positioning state). When performing imaging with imaging attributes that have a relatively high possibility of imaging failure, the user wants to check the pre-image even if it takes some time and determine for themselves whether the positioning is appropriate. On the other hand, when performing photography with attributes that rarely result in failed shots, there is little need for the user to judge the appropriateness of the positioning. Therefore, users want to minimize the time between the end of the pre-shoot and the start of the main shoot, so that the main shoot can be performed while the subject's body movements are minimal.

[0005] However, the technology described in Patent Document 1 does not provide a solution for appropriately performing two types of imaging with different imaging attributes as described above. Furthermore, in the technology described in Patent Document 1, the user cannot determine whether the system is set to display a pre-image after pre-shooting. Therefore, for example, even if the setting is to display a preview image, the user might mistakenly believe that the setting is to not display a preview image, and mistakenly think that the displayed preview image is the actual image, thus ending the radiation scan without performing the actual scan. In that case, it becomes necessary to perform both the preview scan and the actual scan again, resulting in unnecessary radiation exposure for the preview scan.

[0006] This invention has been made in view of the above problems, and aims to enable the same equipment to handle two types of radiographic imaging, pre-imaging and main imaging, where the likelihood of imaging failure differs due to differences in imaging attributes, and to enable users to reliably understand whether or not a pre-image is displayed after pre-imaging. [Means for solving the problem]

[0007] To solve the above problems, the radiography system according to the present invention In a radiography system having imaging control means for controlling radiography, including dynamic radiography, A mode switching means for switching the control mode of the imaging control means between a first imaging mode in which radiography is performed with a single irradiation command and a second imaging mode in which radiography is performed with multiple irradiation commands, It has a user-operable control unit, The second shooting mode allows the shooting conditions for the radiography to be changed based on operations performed by the user on the control unit between the completion of the first radiography performed by the irradiation instruction and the start of the second radiography performed by the next irradiation instruction.

[0008] Furthermore, the imaging control device according to the present invention is A shooting control means for controlling radiographic imaging, including dynamic imaging, A mode switching means for switching the control mode of the imaging control means between a first imaging mode in which radiography is performed with a single irradiation command and a second imaging mode in which radiography is performed with multiple irradiation commands, It has a user-operable control unit, The second shooting mode allows the shooting conditions for the radiography to be changed based on operations performed by the user on the control unit between the completion of the first radiography performed by the irradiation instruction and the start of the second radiography performed by the next irradiation instruction.

[0009] Furthermore, the radiography method according to the present invention is In a radiography method using a radiography system having imaging control means for controlling radiography, including dynamic radiography, The control mode of the imaging control means includes a mode switching step of switching between a first imaging mode in which radiography is performed with a single irradiation instruction and a second imaging mode in which radiography is performed with multiple irradiation instructions. The second imaging mode modifies the imaging conditions for the radiography based on operations performed by the user between the completion of the first radiography ordered by the irradiation command and the start of the second radiography ordered by the next irradiation command. [Effects of the Invention]

[0010] According to the present invention, when performing two-stage radiographic imaging, pre-imaging and main imaging, the same equipment can handle two types of imaging, each with a different probability of failure due to differences in imaging attributes, and the user can reliably determine whether or not a pre-image is displayed after pre-imaging.

Brief Description of Drawings

[0011] [Figure 1] It is a block diagram showing an example of a radiation imaging system according to an embodiment of the present invention. [Figure 2] It is a perspective view of the radiation imaging system of FIG. 1. [Figure 3] It is a block diagram showing another example of the radiation imaging system according to the same embodiment. [Figure 4] It is a block diagram showing another example of the radiation imaging system according to the same embodiment. [Figure 5] It is a block diagram showing an imaging control device included in the radiation imaging systems of FIGS. 1, 3, and 4. [Figure 6] It is a flowchart showing the flow of imaging control processing executed by the imaging control device of FIG. 5. [Figure 7] It is a table showing an example of a mode determination table stored in the imaging control device of FIG. 5. [Figure 8] It is a diagram showing an icon displayed by the imaging control device of FIG. 5. [Figure 9] It is a diagram showing changes in the situation transmission unit included in the radiation imaging systems of FIGS. 1, 3, and 4 as imaging progresses. [Figure 10] It is a flowchart showing the flow of imaging control processing executed by an imaging control device according to a modification of the same embodiment. [Figure 11] It is a block diagram showing a generator included in the radiation imaging system of FIG. 1. [Figure 12] It is a diagram showing a method of displaying a pre-image. [Figure 13] It is a block diagram showing the radiation imaging systems and dose management systems of FIGS. 1, 3, and 4. [Figure 14] It is a table showing an example of information managed by the dose management system of FIG. 13.

Modes for Carrying Out the Invention

[0012] Embodiments of the present invention will be described below with reference to the drawings. However, the technical scope of the present invention is not limited to the following embodiments and illustrated examples.

[0013] <1. Radiography System> First, the general configuration of the radiography system (hereinafter referred to as System 100) according to this embodiment will be described. Figure 1 is a block diagram showing system 100, and Figure 2 is a perspective view showing system 100.

[0014] System 100 includes, for example, a radiation detector (hereinafter referred to as detector 1) and a console 2, as shown in Figure 1. Furthermore, the system 100 according to this embodiment further includes a radiation generator (hereinafter referred to as generator 3). Each of the devices 1 to 3 can communicate with each other via a communication network N (such as a LAN (Local Area Network), WAN (Wide Area Network), or the Internet).

[0015] System 100 also includes a Hospital Information System (HIS), a Radiology Information System (RIS), and other systems not shown in the diagram. It may also be possible to communicate with a Picture Archiving and Communication System (PACS), a dynamic analysis device, etc. Furthermore, the system 100 may be installed in an imaging room, for example, as shown in Figure 2(a), or it may be configured to be movable, such as a mobile examination cart, as shown in Figure 2(b).

[0016] [1-1. Radiation Generators] As shown in Figure 1, the generator 3 comprises a generator 31, an irradiation instruction switch 32, and a light tube 33.

[0017] [1-1-1. Irradiation Indicator Switch] The irradiation instruction switch 32 has a two-stage button. Furthermore, the irradiation instruction switch 32 is configured to output a signal to the generator 31 indicating that only the first button is pressed. Furthermore, the irradiation instruction switch 32 is configured to output a signal to the generator 31 when both the first and second buttons are pressed.

[0018] [1-1-2. Generator] Based on a signal indicating that only the first button of the irradiation instruction switch 32 has been pressed, the generator 31 sends a signal to the tube 33 to instruct the start of preparation for radiation R irradiation. Furthermore, the generator 31 applies voltage and current to the tube 33 according to preset imaging conditions (for example, conditions related to the subject (which can be a person or an object, hereinafter referred to as subject S), such as imaging area, imaging direction, and body size, and conditions related to radiation R, such as tube voltage, tube current, irradiation time, and tube current-time product (mAs value)), based on a signal indicating that the first and second buttons of the irradiation instruction switch 32 have been pressed. Details about this generator 31 will be described later.

[0019] [1-1-3.Tube] The tube 33 is configured to start preparing to generate radiation R (for example, by rotating the anode rotor or supplying filament current to heat the cathode filament) based on receiving a signal from the generator 31 instructing it to start preparations. Furthermore, when a tube voltage is applied to the tube 33 from the generator 31 and a tube current is supplied, the tube 33 generates radiation R (e.g., X-rays, etc.) of a dose corresponding to the applied tube voltage, the incoming tube current, and a predetermined irradiation time. Furthermore, the tube 33 can move in the X-axis direction, the Y-axis direction perpendicular to the X-axis, and the Z-axis direction perpendicular to both the X-axis and the Y-axis, and can also rotate around a rotation axis parallel to the X-axis, Y-axis, and Z-axis to change the direction of the radiation irradiation port.

[0020] Furthermore, the light bulb 33 according to this embodiment has a light bulb display unit 33a, as shown in Figure 2. The tube display unit 33a is configured to display a screen corresponding to the image signal received from the second control unit 311 of the generator 31 (described later) or the control unit 21 of the console 2 (described later). The tube display unit 33a may be housed in a casing integrated with the tube 33, or it may be housed in a separate casing and attached to the tube 33. Furthermore, the tube display unit 33a according to this embodiment is configured to change at least one of the position and orientation of the tube 33 in response to a change in at least one of the position and orientation of the tube 33. This allows the user to view the display on the tube display unit 33a while adjusting at least one of the position and orientation of the tube 33.

[0021] [1-1-4. General Operation of Radiation Generators] The generator 3 configured in this way generates radiation R in a manner corresponding to the form of the radiation image to be generated (still image, dynamic image consisting of multiple frames). In the case of still images, radiation R is irradiated only once for each press of the irradiation instruction switch 32. In the case of dynamic images, pressing the irradiation instruction switch 32 once will cause pulsed radiation R to be irradiated multiple times per predetermined time (for example, 15 times per second), or the irradiation of radiation R will be continued for a predetermined time.

[0022] [1-2. Radiation detectors] Detector 1, although not shown in the figure, includes a sensor substrate in which pixels are arranged in a two-dimensional (matrix) manner, each equipped with a scintillator that emits light at an intensity corresponding to the dose when it receives radiation R, a semiconductor element that generates an electric charge corresponding to the intensity of the received light, and a switch element that stores and releases electric charge; a scanning circuit that switches each switch element on and off; a readout circuit that reads out the amount of electric charge emitted from each pixel as a signal value; a control unit that generates a radiation image from the multiple signal values ​​read out by the readout circuit; and a communication unit that transmits the generated radiation image data and various signals to the outside and receives various information and various signals.

[0023] Then, the detector 1 is synchronized with the timing at which radiation R is irradiated from the generator 3, By accumulating and releasing radiation and reading out signal values, the system generates radiation images corresponding to the dose distribution of the irradiated radiation R. When generating a still image, the radiation image is generated only once for each press of the irradiation instruction switch 32. When generating motion images, the generation of frames constituting the motion image is repeated multiple times per predetermined time (for example, 15 times per second) for each press of the irradiation instruction switch 32.

[0024] Furthermore, the detector 1 may not include a scintillator, and instead generate an electric charge directly when a semiconductor element receives radiation. Furthermore, the detector 1 may be configured to save and transfer the generated dynamic image in the form of image data, or to display it in real time on a display device connected to it (for example, by viewing through it).

[0025] [1-3. Console] Console 2 consists of a PC, a mobile device, or a dedicated device. Furthermore, Console 2 can set imaging conditions for Detector 1 and Generator 3 based on imaging orders from external devices (such as RIS) or user operations. The console 2 according to this embodiment also serves as a shooting control device that constitutes part of the system 100. In other words, console 2 controls detector 1 and generator 3 by executing image acquisition control processing. Details of Console 2, including the shooting control processing, will be described later.

[0026] [1-4. General Operation of the Radiography System] The system 100 configured in this way operates as follows: First, Console 2 controls the process for conducting pre-shooting before the main shoot. Specifically, console 2 causes the generator 3 to irradiate the subject S, who is positioned between the light tube 33 of the generator 3 and the detector 1, which are spaced apart and facing each other, with a pre-dose of radiation R that is lower than the main dose used when performing the main imaging. Detector 1, having received radiation R via subject S, generates a pre-image of subject S and transmits this image data (hereinafter referred to as pre-image data) to console 2. Subsequently, Console 2 controls the process for taking the actual footage. Specifically, console 2 instructs generator 3 to irradiate the subject S with the main dose of radiation R. Detector 1, having received radiation R via subject S, generates a main image of subject S and transmits this image data (hereinafter referred to as "main image data") to console 2. Console 2, upon receiving this image data, generates the final radiation image (hereinafter referred to as the final image).

[0027] [1-5. Others] Up to this point, we have described system 100 in which console 2 also serves as the imaging control device, but the imaging control device may also be a device other than console 2. Specifically, as shown in Figure 3, for example, the radiography system (hereinafter referred to as system 100A) may be configured with, in addition to the detector 1, a console 2A that does not have an imaging control function, and a generator 3A that includes a generator 31A that also serves as an imaging control device. Furthermore, the imaging control device may be provided independently. Specifically, as shown in Figure 4, for example, the radiography system (hereinafter referred to as system 100B) may be configured with the detector 1 and generator 3, as well as a console 2A that does not have a radiography control function and a radiography control device 4.

[0028] <2. Details of the shooting control device> Next, we will explain the details of the imaging control devices (console 2, generator 31A, and imaging control device 4) included in the above systems 100, 100A, and 100B, using console 2, which also functions as an imaging control device, as an example. Figure 5 is a block diagram representing the imaging control devices 2, 31A, and 4, and Figure 6 is a flowchart showing the flow of imaging control processing performed by the imaging control devices 2, 31A, and 4.

[0029] [2-1. Configuration of the imaging control device] As shown in Figure 5, the console 2, which also serves as a shooting control device, comprises a control unit 21, a storage unit 22, a communication unit 23, a display unit 24, and an operation unit 25. Parts 21-25 are electrically connected via a bus or similar device.

[0030] The control unit 21 includes a CPU (Central Processing Unit) and RAM (Random Access Memory). It consists of the following: The CPU of the control unit 21 reads various programs stored in the memory unit 22, expands them into RAM, executes various processes according to the expanded programs, and centrally controls the operation of each part of the console 2.

[0031] The storage unit 22 is composed of non-volatile memory, a hard disk, and the like. Furthermore, the memory unit 22 stores various programs executed by the control unit 21, parameters necessary for program execution, and the like. The memory unit 22 may also be capable of storing image data of radiation images acquired from other devices.

[0032] The communication unit 23 consists of communication modules and the like. The communication unit 23 then connects to other devices via a communication network N (LAN (Local Area Network), WAN (Wide Area Network), Internet, etc.) by wired or wireless connection. It is configured to transmit and receive various signals and data between the device (detector 1, generator 3, etc.).

[0033] The display unit 24 is composed of, for example, an LCD (Liquid Crystal Display), a CRT (Cathode Ray Tube), or the like. The display unit 24 is configured to display radiation images and the like, corresponding to the image signals received from the control unit 21.

[0034] The control unit 25 is configured to be operable by the user. The control unit 25 includes a keyboard (cursor keys, number input keys, various function keys, etc.), a pointing device (mouse, etc.), and a touch panel laminated on the surface of the display unit 24. The operation unit 25 then outputs control signals to the control unit 21 in accordance with the operations performed by the user.

[0035] The console 2 may not include a display unit 24 and an operation unit 25, and may instead receive control signals from an input device provided separately from the console 2 via, for example, a communication unit 23, or output image signals to a display device (monitor) provided separately from the console 2. Furthermore, if other devices (such as generator 3) are equipped with a display unit and an operating unit, the device may receive control signals from the operating unit of the other device or output image signals to the display unit of the other device (the display unit and operating unit may be shared with other devices).

[0036] [2-2. Operation of the shooting control device] The control unit 21 of the console 2, configured as described above, executes, for example, the shooting control process shown in Figure 6, when a predetermined condition is met. The predetermined conditions include, for example, that the power to console 2 is turned on, that a predetermined control signal is received from another device, and that a predetermined operation is performed on the operation unit 25.

[0037] [2-2-1. Acquisition Process] In this shooting control process, the control unit 21 first performs the acquisition process (step S1). In this acquisition process, the control unit 21 acquires inspection information. In the acquisition process according to this embodiment, the control unit 21 receives inspection information from another system via the communication unit 23.

[0038] [2-2-2. Mode Switching Process] After acquiring the inspection information, the control unit 21 performs a mode switching process (step S2). In this mode switching process, the control unit 21 switches its own control mode to either pre-image confirmation mode or short-time shooting mode. The "Pre-image Confirmation Mode" is a control mode that displays a pre-image after a pre-shoot has been performed. The "short shooting mode" is a control mode that performs pre-shooting and then takes the main shot without displaying the pre-shoot image.

[0039] In the mode switching process, the control unit 21 automatically switches the control mode of the shooting control means based on the shooting attribute information. "Image attribute information" is information included in the examination information and includes at least one of the following: • Imaging procedure information (imaging site, direction of imaging (radiation), etc.) • Subject attribute information (disease, disability, age, body type, implants, prosthetics, etc.) • Photographer (user) information (information about photography experience, number of photographers) • Purpose and location of filming (e.g., emergency room, ward rounds, surgery, ICU, etc.) • Information on equipment used (mobile medical unit, general radiography equipment, etc.)

[0040] In the mode switching process according to this embodiment, the control unit 21 uses a mode determination table T1 that shows the correspondence between shooting attribute information and control modes, for example, as shown in Figure 7, and the acquired Switch to the control mode corresponding to the shooting attribute information included in the inspection information. Specifically, if the shooting attribute information is such that it should be switched to pre-image confirmation mode (step S2: Yes), the control unit 21 switches the control mode to pre-image confirmation mode. On the other hand, if the shooting attribute information does not involve switching to the pre-image confirmation mode, that is, if it involves switching to the short-time shooting mode (step S2: No), the control unit 21 switches the control mode to the short-time shooting mode. This eliminates the need to select a control mode each time an inspection is performed, making System 100 more user-friendly.

[0041] Furthermore, by switching the control mode based on the imaging procedure information, it is possible to prevent imaging failures and avoid unnecessary radiation exposure to the subject S by performing imaging with difficult positioning in pre-image confirmation mode. Furthermore, by performing shots that do not require difficult positioning in short-time shooting mode, the time between the end of pre-shooting and the start of main shooting can be shortened, reducing the likelihood of shooting failures due to subject movement.

[0042] Furthermore, by switching the control mode based on subject attribute information, for example, if the accuracy of calculating the shooting conditions (main dose, etc.) for the main shooting is reduced due to the subject S wearing a device (implant, cast, etc.), the main dose can be checked and optimized before the main shooting by performing the pre-image confirmation in pre-image confirmation mode. For example, since elderly individuals tend to have difficulty maintaining positioning, if subject S is above a predetermined age, a pre-image confirmation mode can be used to prevent failed imaging and avoid unnecessary radiation exposure to subject S.

[0043] Furthermore, by switching the control mode based on photographer information, shooting location information, or equipment information, it is possible to prevent shooting failures and avoid unnecessary radiation exposure to the subject S by performing pre-image confirmation in cases where reshoots are frequently required (e.g., when the user is inexperienced, there are few photographers, or the shooting location is an ICU or other place with many obstacles (tubes, etc.)). It is generally said that positioning is more difficult when taking images from a mobile radiography unit than in a general radiography room. Therefore, even for the same chest X-ray, for example, if the equipment used is a mobile radiography unit, the image should be taken in pre-image confirmation mode, and if it is a general radiography unit, it should be taken in short exposure mode. This prevents imaging failures when taking images from a mobile radiography unit and shortens the time required for imaging in a general radiography room, thereby improving examination efficiency.

[0044] Furthermore, the control mode may be switched based on two or more combinations of the following: shooting technique information, subject attribute information, photographer information, shooting purpose / location information, and equipment used information. For example, by combining subject attribute information and photographer information, if subject S is above a predetermined age (elderly) and there is only one photographer, the pre-image confirmation mode is selected. Also, if the subject S is not elderly or if there are multiple photographers, use the short exposure mode. Select this option. When there are multiple photographers, even if the subject S is elderly, their positioning can be stabilized by supporting their positioning during the shoot, thus reducing errors caused by positioning. Therefore, when there are multiple photographers, selecting a short-time shooting mode and completing the shoot quickly reduces the time spent supporting the positioning, thereby reducing the physical burden on the photographers.

[0045] In this mode switching process, the control unit 21 may switch the control mode of the shooting control means based on an operation performed by the user on the operation unit 25.

[0046] By the way, when performing pre-image confirmation mode on a subject S who has difficulty suppressing tremors (for example, a patient with symptoms such as tremors, or a child), even if the positioning is confirmed before the main image is taken, the positioning may change during the main image, resulting in a failed image. In this case, the pre-image does not contribute to improving the quality of the image, and the subject S is unnecessarily exposed to radiation by the amount of the pre-image dose. Furthermore, when photographing subject S in short-time shooting mode, even if the time between the end of pre-shooting and the start of main shooting is shorter than in pre-image confirmation mode, subject S's body movements may make it difficult to combine the pre-image and main image, potentially requiring reshooting.

[0047] Therefore, in the mode switching process, the control unit 21 may switch to one of the following control modes based on the above shooting attribute information: pre-image confirmation mode, short-time shooting mode, and normal shooting mode, which starts with actual shooting without performing pre-shooting. This method reduces the possibility of such imaging failures and prevents subjects from being unnecessarily exposed to radiation. Furthermore, when implants are embedded in the body or when certain devices such as casts are worn. If the imaging of subject S, who is in at least one of the states listed above, is performed in normal imaging mode, the process of calculating the imaging conditions (main dose, etc.) for the main imaging is omitted. This prevents the derivation of inaccurate imaging conditions due to the presence of implants or other devices, and prevents the main imaging from being performed under those conditions, resulting in imaging failure. By executing the mode switching process described above, the control unit 21 becomes a mode switching means. Furthermore, the process of performing the mode switching process constitutes the mode switching process in the radiography method using system 100.

[0048] By the way, if we try to automate the switching of the shooting control mode in rare cases where the combination of various shooting attribute information is unusual, it would be necessary to register the assignments for a large amount of shooting attribute information, which would be an enormous amount of work when setting up System 100. Therefore, after the mode switching process is executed, the control unit 21 may be configured to overwrite the various settings in the switched control mode with new settings based on the operation performed by the user on the operation unit 25. In this way, the control mode switching is automated in most cases, and in rare cases, the user only needs to change minimal settings, reducing the effort required to set up System 100 while still being able to handle rare shooting scenarios.

[0049] [2-2-3. First Imaging Control Processing] In the mode switching process, if the control mode is switched to the pre-image confirmation mode, the control unit 21 executes the first shooting control process (step S3). In other words, executing the first image capture control process is equivalent to performing control in pre-image confirmation mode.

[0050] (First output processing) In the first shooting control process, the control unit 21 first executes the first output process (step S31). In this first output processing, the control unit 21 outputs whether it is controlling in pre-image confirmation mode or short-time shooting mode, that is, that it is controlling in pre-image confirmation mode. In the first output processing according to this embodiment, the control unit 21 displays on the display unit 24 that it is being controlled in pre-image confirmation mode. Furthermore, in the first output processing according to this embodiment, the control unit 21 transmits a signal to another device (such as the generator 3) indicating that it is being controlled in pre-image confirmation mode. Furthermore, in the first output processing according to this embodiment, the control unit 21 continues this output at least until the actual shooting is completed.

[0051] When the system is controlled in pre-image confirmation mode, the control unit 21 displays information to inform the user that pre-shooting and main shooting are separate processes. For example, two icons I corresponding to the number of shooting operations (number of images displayed) are displayed, as shown in Figure 8(a). The two icons I may be displayed overlapping, as shown in Figure 8(b). Alternatively, as shown in Figure 8(c), the two icons I may be displayed with a space between them. This makes it clearer to the user that at least two more shooting operations (pressing the first and second buttons on the illumination instruction switch 32) are required afterward. It also makes it clearer that two images (a preview image and the main image) will be displayed during the shooting sequence. In addition, during this first output processing, the control unit 21 may output, via sound, light emission, or other means, that it is being controlled in pre-image confirmation mode.

[0052] In the case of a console 2 according to this embodiment, which has two control modes, if the control mode is not output, the user may mistakenly think which control mode is active and terminate the recording midway. For example, when taking a picture in pre-image confirmation mode, if the user mistakenly believes it is in short-time shooting mode, they may mistakenly think that the main shooting is complete once the pre-image is displayed, and end the series of shots midway without taking the main shot. In that case, the series of shots must be restarted from the beginning, resulting in unnecessary exposure to radiation equivalent to the pre-image dose for subject S. However, by outputting which control mode is being used, it is possible to prevent user misunderstandings.

[0053] (Pre-shooting conditions setting and display processing) After switching the control mode, the control unit 21 performs pre-shooting condition setting and display processing (step S32). In this pre-shooting condition setting and display process, the control unit 21 sets the shooting conditions for pre-shooting. Furthermore, in the pre-shooting condition setting and display processing, the control unit 21 may be capable of changing the tube voltage value, tube current value, and irradiation time, or the tube voltage value and tube current time product, when performing pre-shooting, based on operations performed by the user on the operation unit 25.

[0054] Furthermore, in the pre-shooting condition setting and display processing, the control unit 21 displays one of the following values ​​on the display unit 24 before performing pre-shooting. • Tube voltage value, tube current value, and irradiation time when performing pre-imaging. • Tube voltage value and tube current-time product when performing pre-shooting

[0055] (First pre-shooting execution process) After setting the shooting conditions for pre-shooting, the control unit 21 executes the first pre-shooting execution process (step S33). In this first pre-shooting execution process, the control unit 21 performs control for performing pre-shooting. In this first pre-shooting execution process, the control unit 21 first waits until the communication unit 23 receives a signal from the generator 31 of the generator 3 indicating that the irradiation instruction switch 32 has been operated. Then, when the communication unit 23 receives a signal from the generator 31 indicating that both the first and second buttons of the irradiation instruction switch 32 have been pressed, the control unit 21 performs control to perform pre-imaging (for example, by having the communication unit 23 send a signal to the detector 1 to start charge accumulation and readout).

[0056] (Pre-image display processing) After the pre-shooting is performed, the control unit 21 executes pre-image display processing (step S34). In this pre-image display process, the control unit 21 displays a pre-image on the display unit 24 based on the pre-image data received from the detector 1.

[0057] (Positioning determination process) After the pre-shooting is performed, the control unit 21 executes a positioning determination process (step S35). In this positioning determination process, the control unit 21 determines whether the positioning of the subject S is appropriate. In the positioning determination process according to this embodiment, the control unit 21 first acquires a preliminary image from the detector 1. After acquiring the preliminary image, the control unit 21 analyzes the preliminary image. After analyzing the pre-image, the control unit 21 determines whether the positioning is appropriate based on the analysis results of the pre-image. Conventional techniques can be used for analyzing pre-images and determining the appropriateness of positioning. By executing the positioning determination process described above, the control unit 21 functions as both an analysis means and a positioning determination means.

[0058] In this positioning determination process, the control unit 21 may not perform analysis of the pre-image, but instead obtain the analysis results from an analysis device (not shown).

[0059] Furthermore, the control unit 21 may be configured to allow setting whether or not to execute this positioning determination process before the process is executed. In this case, the control unit 21 may be configured to determine whether or not to execute the process based on an operation performed by the user on the operation unit 25. In this way, if the suitability of positioning must be compromised due to the physical characteristics of subject S, etc., the automatic determination of suitability of positioning can be avoided, thereby eliminating the need to check the automatic determination results.

[0060] Furthermore, the control unit 21 may be configured to automatically determine whether or not to execute a mode switching process, for example, based on the shooting attribute information. The criteria for determining the appropriateness of positioning vary depending on the imaging technique. Furthermore, for some imaging techniques, it is difficult to automatically determine the appropriateness of positioning. However, by disabling automatic positioning determination in such cases, it is possible to prevent users from becoming confused by incorrect determination results or having to perform unnecessary verification work. Furthermore, when performing a shooting technique that inevitably involves positioning errors that must be avoided, automatically determining the appropriateness of the positioning ensures that even inexperienced users can maintain a certain level of shooting quality.

[0061] (First condition derivation process) After the preliminary shooting is performed, the control unit 21 executes the first condition derivation process (step S36). In this first condition derivation process, the control unit 21 derives the shooting conditions for the main shooting based on the pre-image obtained in the pre-shooting. In the first condition derivation process according to this embodiment, the control unit 21 derives shooting conditions, i.e., shooting conditions that do not assume image synthesis, such that the density of pixels in the radiation image ultimately generated by this dose alone is the desired density. This is because, in pre-image confirmation mode, the time between the end of pre-shooting and the start of main shooting is longer, during which time the subject S moves relatively significantly, making it difficult to combine the pre-image and main image (increasing the possibility of shooting failure).

[0062] Furthermore, during the first condition derivation process (from the end of pre-imaging until the start of main imaging), the control unit 21 may be able to change the tube voltage value, tube current value, and irradiation time, or the tube voltage value and tube current time product, when performing main imaging, based on operations performed by the user on the operation unit 25. In this way, even if inappropriate imaging conditions are automatically generated due to the presence of implants, etc., these conditions can be optimized to prevent imaging failures. ru.

[0063] (Display processing of shooting conditions) After deriving the shooting conditions for the actual shooting, the control unit 21 executes the process of displaying the shooting conditions (step S37). In this main shooting condition display process, the control unit 21 displays one of the following values ​​on the display unit 24 before the main shooting is performed. • Tube voltage value, tube current value, and irradiation time when performing this imaging. • Limit values ​​of tube voltage and tube current-time product when performing this imaging. In this way, during the first shooting control process, the control unit 21 displays the shooting conditions for pre-shooting and the shooting conditions for main shooting separately (when displaying the shooting conditions for pre-shooting, it does not display the shooting conditions for main shooting). In pre-image confirmation mode, explicit user interaction (for example, selecting the next action, as described later) occurs between the end of pre-shooting and the start of main shooting. Therefore, by separating the display of shooting conditions for pre-shooting and main shooting, the display of shooting conditions is linked to user interaction, making it easier for the user to understand which type of shooting they are about to perform.

[0064] Furthermore, if at least one of the first condition derivation process and the pre-shooting condition setting / display process is configured to allow changes to the tube voltage value, etc., based on user operation, the control unit 21 may be configured to automatically change the value of parameters that should not be changed between pre-shooting and main shooting (e.g., tube voltage, tube current, additional filter, etc.) to the same value if one of the values ​​for pre-shooting or main shooting is changed. Alternatively, if pre-shooting has already been performed, it is preferable to prevent the change of such parameters during main shooting. This method prevents accidentally changing parameters that should not be altered between pre-shooting and the actual shoot, thus preventing shooting failures.

[0065] Furthermore, in the first shooting control process, the control unit 21 may simultaneously display the shooting conditions for pre-shooting and the shooting conditions for the main shooting before pre-shooting is performed. In this case, the control unit 21 may change the display mode of at least one of the pre-shooting and main shooting displays before starting shooting, so that the shooting conditions for the shooting to be performed are more prominent than the shooting conditions for the other shootings, or the shooting conditions for the other shootings are less prominent than the shooting conditions for the shooting to be performed. Specifically, this involves making the display color of the shooting conditions for the upcoming shoot darker or larger, while graying out or shrinking the shooting conditions for other shoots. In this case, the control unit 21 displays the upper limits of the tube voltage value, tube current value, and irradiation time when performing the actual imaging, or the upper limit of the tube voltage value and tube current time product when performing the actual imaging, as the imaging conditions for the actual imaging.

[0066] Furthermore, if the upcoming shoot is the main shoot, the pre-shoot will have already been completed. Therefore, the control unit 21 may be configured to terminate the display of the pre-shoot conditions after the pre-shoot is completed. Furthermore, in the configuration described above, the control unit 21 may be configured to display common shooting conditions (e.g., tube voltage, etc.) for both pre-shooting and main shooting in a single display.

[0067] (Action decision process) After displaying the shooting conditions for this shoot on the display unit 24, the control unit 21 executes the operation determination process (step S38). In this action determination process, the control unit 21 determines the next action to be performed. In the operation determination process according to this embodiment, the control unit 21 first informs the user for a predetermined time. The system waits until at least one of the irradiation instruction switch 32 or the control panel of the console 2 (for example, a touch panel type selection button provided on the display unit 24) is operated. When the user operates at least one of the irradiation instruction switch 32 and the operation unit 25, the control unit 21 determines the next action to take based on these operations.

[0068] Specifically, if the operation of the irradiation instruction switch 32 is any of the following, the control unit 21 decides that the next operation to perform is to end the shooting. • When all buttons on the irradiation instruction switch 32 are released - If the second button is released before a specified time has elapsed since the end of pre-shooting or the display of the pre-image. - When all buttons are released and the mode of the control unit 25 is set to the mode for selecting end shooting.

[0069] Furthermore, if the operation mode of the irradiation instruction switch 32 is any of the following, the control unit 21 decides to perform the next operation as actual imaging. - When the second button of the irradiation instruction switch 32 is released (only the first button is pressed) and the second button is pressed again. - If the second button is pressed continuously until a predetermined amount of time has elapsed since the end of pre-shooting or the display of the pre-image. - When all buttons are released and the operation unit 25 is set to a state where no operation is selected, and the second row of buttons is pressed again.

[0070] Furthermore, if the operation mode of the irradiation instruction switch 32 is any of the following, the control unit 21 decides to perform pre-shooting as the next operation. - When all buttons on the irradiation instruction switch 32 are released, and both the first and second row buttons are pressed again. - If the second button is pressed again while only the second button is released, before a predetermined time has elapsed since the end of pre-shooting or the display of the pre-image. - When all buttons are released and the operation unit 25 is set to the mode for selecting pre-shooting, if the second row of buttons is pressed again

[0071] If the next action to be performed in this action determination process is determined to be pre-shooting, the control unit 21 returns to the pre-shooting condition setting and display process (step S32). On the other hand, if the next action to be performed in the action determination process is determined to be the end of shooting, the control unit 21 proceeds to the process of step S5. In addition, during the operation determination process, the control unit 21 may display, for example, a message indicating that the operation determination process is starting, a selection of the next operation to be performed (main shooting, pre-shooting, end of shooting), and the selected next operation on the display unit 24.

[0072] (First shooting process) If the operation to be performed next in the above operation determination process is determined to be actual shooting, the control unit 21 executes the first actual shooting execution process (step S39). In this first main shooting execution process, the control unit 21 first waits until the communication unit 23 receives a signal from the generator 31 of the generator 3 indicating that the irradiation instruction switch 32 has been operated. Then, when the communication unit 23 receives a signal from the generator 31 indicating that both the first and second buttons of the irradiation instruction switch 32 have been pressed, the control unit 21 performs the necessary controls to perform the actual imaging (for example, by having the communication unit 23 send a signal to the detector 1 to start accumulating and reading out the charge).

[0073] In addition, during the first main shooting execution process, the control unit 21 may perform control such that the irradiation of radiation by the generator 3 and the generation of images by the detector 1 are repeated multiple times during a single main shooting (for example, for video recording).

[0074] (First status communication process) In the first shooting control process, the control unit 21 executes the first status transmission process in parallel with the processes in steps S33 to S39 described above. In this first status transmission process, the control unit 21 transmits to the status transmission unit information that is different from the information transmitted during the period between the end of pre-shooting and the start of main shooting. Specifically, as shown in Figure 9(a), for example, when neither pre-shooting nor main shooting is taking place, the control unit 21 sets the status transmission unit to first mode A1, and while pre-shooting or main shooting is taking place, The control unit 21 has the status transmission unit configured as the second configuration A2.

[0075] In Figure 9(a), the status communication unit before pre-shooting, after pre-shooting, before the start of main shooting, and after main shooting are all treated as the same first mode A1. However, the status communication unit may be different in each of these three periods, as long as it is a different mode from the second mode A2. The status transmission unit includes the display unit 24, as well as a monitor attached to the shooting control device, an illumination instruction switch 32, a speaker, a lamp, and the like. This allows the user to intuitively understand that in pre-image confirmation mode, the button on the irradiation instruction switch 32 needs to be released. In particular, by making the irradiation instruction switch 32 function as a status communication unit, the user can recognize the current status (whether or not shooting is taking place) at their fingertips.

[0076] Thus, in the first imaging control process (pre-image confirmation mode), depending on the user's selection, pre-imaging may be performed two or more times, or the main imaging may not be performed at all. Therefore, the total radiation exposure until the final image is obtained will be pre-dose × number of pre-imaging sessions + main dose, or pre-dose × number of pre-imaging sessions (if the main imaging is interrupted).

[0077] [2-2-4. Second Imaging Control Processing] In the mode switching process (step S2), if the control mode is switched to the short-time shooting mode, the control unit 21 executes the second shooting control process (step S4). In other words, executing the second shooting control process is equivalent to performing control in short-time shooting mode.

[0078] (Second output processing) In this second shooting control process, the control unit 21 first performs the second output process (step S41). In this second output processing, the control unit 21 outputs a message indicating that it is controlling the system in short-time shooting mode. In the second output processing according to this embodiment, the control unit 21 displays on the display unit 24 that it is being controlled in short-time shooting mode. Furthermore, in the second output processing according to this embodiment, the control unit 21 transmits a signal to another device (such as the generator 3) indicating that it is being controlled in short-time shooting mode. Furthermore, in the second output processing according to this embodiment, the control unit 21 continues this output at least until the end of the actual shooting.

[0079] In the second output processing, the control unit 21 displays content that informs the user that the pre-shooting and main shooting are a single series of shots and are not separated, or that does not make the user aware that they are separated. For example, as shown in Figure 8(d), one icon I corresponding to the number of shooting operations (number of images displayed) is displayed. Furthermore, if the first output processing described above is set to display two non-overlapping icons I (Figures 8(a), (c)), then in this second output processing, it is also possible to display two overlapping icons I as shown in Figure 8(b). This makes it clearer to the user that the subsequent shooting operation will only be performed once. It also makes it clearer that only one image (the main image) will be displayed during the series of shots. In addition, during this second output processing, the control unit 21 may output, via sound, light, or other means, that it is being controlled in short-time shooting mode.

[0080] In the case of a console 2 according to this embodiment, which has two control modes, if the control mode is not output, the user may mistakenly think which control mode is active and terminate the recording midway. For example, when taking images in short-time shooting mode, if a user mistakenly believes they are in pre-image confirmation mode, they may release the irradiation instruction switch button when the pre-shooting is complete, ending the series of shots prematurely. Alternatively, they may realize after some time that they haven't taken the main shot yet and proceed with the main shot, resulting in the subject S moving significantly, making it difficult to combine the pre-image and main image. In this case, the subject S would be unnecessarily exposed to radiation equivalent to the pre-dose. Or, the user might mistake the image displayed after the main shot for the pre-image and use it to confirm and adjust the subject S's positioning, potentially leading to a decrease in examination efficiency due to these unnecessary steps. However, by displaying an indication that the camera is being controlled in short-time shooting mode, it is possible to prevent users from misunderstanding the situation. By executing the second output processing or the first output processing described above, the control unit 21 becomes a mode output means or a mode notification means. Furthermore, the process of performing the first output processing or the second output processing constitutes the mode notification process in the radiography method.

[0081] (Shooting conditions setting and display processing) After switching the control mode, the control unit 21 performs shooting condition setting and display processing (step S42). In this shooting condition setting and display process, the control unit 21 sets the shooting conditions for pre-shooting.

[0082] Furthermore, in the shooting condition setting and display processing, the control unit 21 displays the tube voltage, tube current and irradiation time, or the tube voltage and tube current time product. In the shooting condition setting and display processing according to this embodiment, the control unit 21 displays, before performing pre-shooting, the tube voltage value and tube current value when performing pre-shooting, the tube voltage value and tube current value when performing main shooting, and the upper limit of the sum of the irradiation time when performing pre-shooting and the irradiation time when performing main shooting, or the upper limit of the sum of the tube voltage value when performing pre-shooting, the tube voltage value when performing main shooting, and the sum of the tube current time product when performing pre-shooting and the tube current time product when performing main shooting. Furthermore, if the same tube voltage is used for both pre-shooting and main shooting, it may be possible to display them together in a single display. This would reduce the amount of information the user needs to check and make it easier to understand the shooting conditions. Furthermore, if the same tube current is used for both pre-shooting and main shooting, it would be acceptable to display them together in a single display, similar to how the tube voltage is displayed.

[0083] In other words, in the first shooting control process, the control unit 21 was configured to display the shooting conditions for pre-shooting and the shooting conditions for main shooting separately, but in the second shooting control process, These are all displayed together. In pre-image display mode, explicit user interaction occurs between pre-shooting and main shooting. Therefore, in the first shooting control processing, separating the display of shooting conditions for pre-shooting and main shooting helps users understand that there are two separate shooting processes. This links to user interaction, makes it easier to understand, and prevents misunderstandings about the mode. On the other hand, in short-time shooting mode, as will be explained later, there is no user interaction between pre-shooting and main shooting. Therefore, in the second shooting control processing, displaying the shooting conditions for pre-shooting and main shooting together as if they were a single shoot would link to the user's actions, make it easier to understand, and prevent misunderstandings about the mode. By executing the shooting condition setting and display processing described above, or the pre-shooting condition setting and display processing and the main shooting condition display processing in the first shooting control processing described above, the control unit 21 and the display unit 24 become a display means.

[0084] (Second pre-shooting execution process) After setting the shooting conditions for pre-shooting, the control unit 21 executes the second pre-shooting execution process (step S43). In this second pre-shooting execution process, the control unit 21 performs control for performing pre-shooting.

[0085] (Second condition derivation process) After the preliminary shooting is performed, the control unit 21 executes the second condition derivation process (step S44). In other words, in the second imaging control process, the control unit 21 does not perform positioning determination processing (does not determine whether the positioning is appropriate) after performing pre-imaging. This shortens the time between the end of pre-imaging and the start of main imaging, reducing the subject S's body movement during that time and making it easier to combine the pre-image and main image (reducing the possibility of imaging failure). In this second condition derivation process, the control unit 21 derives the shooting conditions for the main shooting based on the pre-image obtained in the pre-shooting. In the second condition derivation process according to this embodiment, the control unit 21 derives imaging conditions such that the pixel density of the radiation image ultimately generated by the sum of the pre-dose and the main dose becomes the desired density.

[0086] In other words, in the first shooting control process, the control unit 21 derives shooting conditions that do not presuppose image synthesis, but in the second shooting control process, it derives shooting conditions that presuppose image synthesis. By doing so, the total radiation dose to subject S can be reduced by the amount of the pre-dose compared to when the first imaging control processing is performed. By executing the second condition derivation process described above, or the first condition derivation process in the first shooting control process, the control unit 21 becomes a condition derivation means.

[0087] (Second shooting execution process) After deriving the shooting conditions for the main shoot, the control unit 21 executes the second main shoot execution process (step S45). In this second main shooting execution process, the control unit 21 automatically executes the main shooting. In addition, during the second main imaging process, the control unit 21 may be configured to perform control such that the irradiation of radiation by the generator 3 and the generation of an image by the detector 1 are repeated multiple times during a single main imaging cycle.

[0088] (Second status communication process) In the second shooting control process, the control unit 21 executes the second status transmission process in parallel with the processes in steps S43 to S45 described above. In this second status transmission process, the control unit 21 transmits the same information during the period from the end of pre-shooting to the start of main shooting as it did during pre-shooting and main shooting. Specifically, as shown in Figure 9(b), for example, when neither pre-shooting nor main shooting is taking place, the control unit 21 sets the status transmission unit to first mode A1, and from the start of pre-shooting until the end of main shooting... Until completion, the control unit 21 will set the status transmission unit to the second mode A2. This prevents users from mistakenly releasing the illumination instruction switch 32 button when they mistakenly believe that the end of pre-shooting in short-time shooting mode is the end of main shooting. By executing the second status transmission process described above, or the first status transmission process in the first shooting control process, the control unit 21 and the display unit 24 constitute a status transmission means.

[0089] (Synthesis process) After the main image capture is performed, the control unit 21 executes the synthesis process (step S46). In this synthesis process, the control unit 21 synthesizes the pre-image and the main image obtained during the main shooting to generate a composite image. The short-time shooting mode is used because the time between the end of the pre-shooting and the start of the main shooting is short, resulting in less body movement of the subject S during that time, and making the pre-image and main image suitable for synthesis. Various conventionally known techniques can be used for image synthesis. By performing the synthesis process described above, the control unit 21 becomes a synthesis means.

[0090] The control unit 21 may also be configured to allow setting whether or not to perform this synthesis process for each control mode before the process is executed (at least one of the following timings: before pre-shooting, before main shooting, and after main shooting). Furthermore, in the case of such a configuration, if it is set not to perform synthesis of the pre-image and the main image, the control unit 21 may derive the shooting conditions so that the pixel density of the radiation image ultimately produced by the main dose alone becomes the desired density, even when executing this second condition derivation process (controlling in short-time shooting mode). In this way, the control unit 21 becomes a setting means.

[0091] Incidentally, depending on the purpose of imaging and the imaging technique (for example, when imaging microfractures), an uncomposited image (e.g., this image) may be more suitable for diagnosis than a composite image. Furthermore, some doctors who order the imaging may prefer that the final image used for diagnosis be an un-composited image. Therefore, in the configuration described above, the control unit 21 may be configured to automatically set the control mode based on the shooting attribute information. In this case, the control unit 21 may also be configured to override and change the set control mode in response to an operation performed by the user on the operation unit 25 (manually). In this way, for example, by setting synthesis as the default setting and allowing users to manually change it to no synthesis as needed, it is possible to flexibly respond to the requests of doctors and other professionals without having to pre-configure detailed sorting settings.

[0092] Thus, in the second imaging control process (short-time imaging mode), one pre-imaging and one main imaging are performed, so the total radiation exposure until the final image is obtained is the pre-imaging dose plus the main dose.

[0093] [2-2-5. Final Image Display Processing] After executing the first image capture control process (step S3) or the second image capture control process (step S4), the control unit 21 executes the final image display process (step S5) as shown in Figure 6. . In this final image display process, the control unit 21 outputs the final image. In the final image display process according to this embodiment, the control unit 21 causes the final image to be displayed on the display unit 24.

[0094] The final image is the radiation image that is ultimately generated just before this final image display process (just before the end of the image capture control process). In other words, if the first image capture control process was executed before this final image display process, the final image will be either the main image or a preview image. In other words, in the first imaging control process, the control unit 21 does not perform the synthesis process before displaying the final image (it does not synthesize the pre-image and the main image). This is because the pre-image confirmation mode is used because the time between the end of pre-imaging and the start of main imaging is long, resulting in significant body movement of the subject S during that time, making the pre-image and main images unsuitable for synthesis. On the other hand, if the second image capture control process is performed before the final image display process, the final image will be a composite image.

[0095] By executing the shooting control process described above, the control unit 21 becomes a shooting control means.

[0096] [2-2-6. Others] If any abnormality occurs before the start of the main imaging session, proceeding with the session as is may result in images that are unsuitable for diagnosis. Therefore, in the above-mentioned shooting control process, the control unit 21 may perform a mode switching process (switch its own control mode) after pre-shooting has been performed. Specifically, as shown in Figure 10, for example, in the short-time shooting mode, the control unit 21 may determine whether an abnormality occurred between the end of pre-shooting and the start of main shooting (steps S43A, S44A, S44B), and if it determines that an abnormality has occurred, it may switch the control mode to pre-image confirmation mode. In this case, the control unit 21 may determine whether an abnormality has occurred (by switching the control mode) based on at least one of the following pre-shooting results. • Detection of density anomalies based on preliminary images • Artifact detection based on pre-images • Determination of subject type based on pre-images • Detection of communication anomalies or communication delays during pre-shooting • Abnormality detection of actual shooting conditions or the irradiated pre-shoot dose. • Detection of abnormal operation or equipment malfunction during pre-shooting

[0097] In this case, the control unit 21 may also determine whether or not an abnormality has occurred based on the processing result in the positioning determination process (step S35). In this way, the processing time can be reduced compared to when the process for obtaining the above pre-shooting results for switching the control mode is performed separately from the second condition derivation process.

[0098] Furthermore, if the control unit 21 determines that an abnormality has occurred after a pre-image has been obtained during the second pre-shooting execution process, it may switch to pre-image confirmation mode and then execute the pre-image display process. In this way, the user can easily understand the status of the system 100. In this case, during the operation determination process, the control unit 21 may limit the next selectable operation to either pre-shooting or ending shooting (making it impossible to select main shooting). On the other hand, if the control unit 21 determines that an abnormality (e.g., a communication error) has occurred while a pre-image has not been obtained, it switches to pre-image confirmation mode and then proceeds with pre-image display processing ~ main shooting conditions table. The display process may be skipped.

[0099] Furthermore, after switching from short-time shooting mode to pre-image confirmation mode, the control unit 21 may derive shooting conditions in the first condition derivation process such that the pixel density of the radiation image ultimately generated by the main dose alone is the desired density, and skip the synthesis process. This is because when switching to pre-image confirmation mode, the operation determination process is executed, which extends the time between the end of pre-shooting and the start of main shooting, causing the subject S to move relatively significantly, making it difficult to synthesize the pre-image and main image. Furthermore, if the control mode is switched to the pre-image confirmation mode after the execution of the second condition derivation process, the control unit 21 may omit the processing common to the previous second condition derivation process in the first condition derivation process executed after the switch, and utilize the processing results obtained in the second condition derivation process. In this way, the processing time can be shortened compared to executing the first condition derivation process from scratch.

[0100] Furthermore, in the above-mentioned shooting control process, after deriving the shooting conditions for the actual shooting, the control unit 21 of the console 2 may execute a decision process. In this determination process, the control unit 21 determines whether the derived shooting conditions for the actual shooting satisfy predetermined conditions. These "predetermined conditions" include, for example, that the set tube current is equal to or greater than a predetermined value. The control unit 21 then instructs the communication unit 23 to transmit the determination result to the generator 31 of the generator 3. By executing the decision-making process described above, the control unit 21 becomes a decision-making means.

[0101] <3. Generator Details> Next, we will explain the details of the generators 31 and 31A provided in the above systems 100, 100A, and 100B, using generator 31, which does not also function as an imaging control device, as an example. Figure 11 is a block diagram representing the generator 31.

[0102] [3-1. Generator Configuration] As shown in Figure 11, the generator 31 includes a second control unit 311, a second storage unit 312, a second communication unit 313, and a high-voltage generation unit 314. Parts 311 to 314 are electrically connected via buses or similar means.

[0103] The second control unit 311 is composed of a CPU, RAM, and the like. The CPU of the second control unit 311 reads various programs stored in the second memory unit 312, expands them into RAM, executes various processes according to the expanded programs, and centrally controls the operation of each part of the generator 31.

[0104] The second memory unit 312 is composed of non-volatile memory, a hard disk, or the like. Furthermore, the second memory unit 312 stores various programs executed by the second control unit 311, parameters necessary for program execution, and so on.

[0105] The second communication unit 313 consists of communication modules and the like. The second communication unit 313 is connected by wired or wireless means via a communication network N (LAN (Local Area Network), WAN (Wide Area Network), Internet, etc.). It is designed to send and receive various signals and data with other devices (detector 1, console 2, etc.).

[0106] The high-voltage generation unit 314 applies a tube voltage to the tube 33 corresponding to the control signal received from the second control unit 311, and also supplies a tube current to the tube 33 corresponding to the control signal.

[0107] [3-2. Generator Operation] The second control unit 311 of the generator 31, configured as described above, operates as follows.

[0108] [3-2-1. Tube Control] For example, the second control unit 311 executes tube control processing when a predetermined condition is met. The predetermined conditions include, for example, that the power to the generator 31 is turned on, that a predetermined control signal is received from another device, and that the irradiation instruction switch 32 is operated. In the tube control process, the second control unit 311 controls the state of the tube 33 based on the control mode of the console, the operation method of the irradiation instruction switch 32, etc.

[0109] Specifically, the second control unit 311 first, based on a signal indicating that only the first button of the irradiation instruction switch 32 has been pressed, causes the second communication unit 313 to send a signal to the tube 33 instructing it to begin preparing for radiation R irradiation. Furthermore, in the tube control processing, the second control unit 311, based on a signal indicating that both the first and second buttons of the irradiation instruction switch 32 have been pressed, causes the high-voltage generation unit 314 to generate a tube voltage and tube current according to the set shooting conditions. The high-voltage generation unit 314 then applies the generated tube voltage to the tube 33 and supplies tube current to the tube 33.

[0110] Furthermore, in the tube control processing, the second control unit 311 determines whether the signal received from the console 2 indicates that the camera is being controlled in pre-image confirmation mode before pre-imaging begins.

[0111] If the control unit 21 determines that the signal indicates that it is being controlled in pre-image confirmation mode, it temporarily cancels the illumination readiness state of the light tube 33 between the end of pre-shooting and the start of main shooting. In pre-image confirmation mode, it may be difficult to determine the appropriateness of the positioning, and image confirmation may take some time (approximately 10-20 seconds). If the tube 33 remains in a ready-to-irradiate state during this time, the load on the filament and anode rotor increases, shortening the lifespan of the tube 33. A shortened lifespan of the tube 33 increases the maintenance cost of the generator 3 due to the need to replace the tube 33. However, by temporarily releasing the irradiation readiness state of the light tube 33, the lifespan of the light tube 33 can be extended and the maintenance costs of the generator 3 can be reduced. Furthermore, after the second control unit 311 releases the irradiation readiness state of the tube 33, when it receives an instruction from the user to start the main imaging or to start pre-imaging again, it causes the second communication unit 313 to transmit a signal to the tube 33 instructing it to start preparing for radiation R irradiation.

[0112] On the other hand, if the control unit 21 determines that the signal is not indicating that it is being controlled in pre-image confirmation mode (i.e., the control unit 21 is controlling in short-time shooting mode), the second control unit 311 does not release the ready-to-irradiate state of the light tube 33 from the end of pre-shooting until the start of main shooting. In short-time imaging mode, it is desirable to minimize the time between the completion of pre-imaging and the start of main imaging. On the other hand, it generally takes about 1 to several seconds for the tube 33 to prepare to generate radiation R. Therefore, separately preparing for radiation irradiation for main imaging after pre-imaging increases the time between the completion of pre-imaging and the start of main imaging, which increases the risk that the subject S may move relatively significantly during that time, making it difficult to combine the pre-image and main image (increasing the possibility of imaging failure). However, by maintaining the ready-to-irradiate state of the light tube 33 without releasing it, the risk of such imaging failures can be reduced.

[0113] Furthermore, if the control unit 21 of console 2 is configured to perform a decision process, and the control unit 21 determines that the shooting conditions for this shooting meet predetermined conditions, the second control unit 311 may not release the state in which the light tube 33 is ready for irradiation, even if console 2 is performing control in pre-image confirmation mode. For example, if the tube current set by console 2 is less than 500mA (a low load), the irradiation preparation state may not be canceled, but if the load is 500mA or more (a high load), it may be canceled as usual. Furthermore, if there are two focal sizes for radiation R, one large and one small, the irradiation preparation state may be kept in place when irradiating with radiation R at the larger focal spot, which can withstand relatively high loads, while the state may be released as usual when irradiating with the smaller focal spot, which cannot withstand relatively high loads. This method allows for a balance between extending the lifespan of the tube 33 and reducing the waiting time during shooting.

[0114] Furthermore, in the pre-image confirmation mode, the second control unit 311 may be configured to set whether or not to continue the irradiation preparation complete state based on the operation performed by the user. This would accommodate users who prioritize short waiting times during shooting over the lifespan of the light tube 33. Furthermore, when releasing the irradiation readiness state, the second control unit 311 may maintain the irradiation readiness state for one of the components, the anode rotor and the filament, while releasing only the irradiation readiness state for the other component. This would extend the lifespan of the component whose irradiation readiness state is being released. By executing the tube control process described above, the second control unit 311 becomes a tube control means.

[0115] [3-2-2. Display Control] Furthermore, when the control unit 21 of the console 2 performs pre-image display processing, the second control unit 311 causes the pre-image, based on the pre-image image data received from the console 2, to be displayed on the tube display unit 33a. This allows the user to immediately consider necessary adjustments when readjusting positioning after the pre-shooting is complete, by referring to the pre-image displayed on the tube display unit 33a.

[0116] Furthermore, if pre-shooting is performed multiple times, the second control unit 311 may be configured to display all the obtained pre-images. In this case, instead of displaying all of the preview images, it may be possible to display only a few of the most recently obtained preview images. This makes it easier for users to compare multiple preview images and consider fine-tuning their positioning.

[0117] Furthermore, in the configuration described above, the second control unit 311 may be configured to display multiple pre-images arranged in a matrix, for example, in a single row vertically or horizontally, or to display the most recent pre-image relatively larger than other pre-images obtained earlier. When multiple preliminary images are available, the more recently obtained images will show the subject S's positioning more optimally, making them more useful for fine-tuning the positioning. Therefore, this approach improves the visibility of more useful images and increases the efficiency of the shooting process.

[0118] Furthermore, in the configuration described above, the second control unit 311 may be configured to select a method for displaying the pre-image in response to an operation performed by the user on a tube operation unit (not shown) provided on the tube 33. Furthermore, the second control unit 311 may switch the display of multiple pre-images on or off in response to a display switching operation of the pre-images displayed on the tube display unit 33a (for example, a flick operation performed on a touch panel stacked on the tube display unit 33a).

[0119] In this case, the second control unit 311 may display sequential information corresponding to the shooting order attached to each pre-image P, along with the pre-image P currently displayed on the tube display unit 33a. This sequence information includes, for example, a number n indicating the shooting order as shown in Figure 12, as well as symbols that can recognize sequences other than the number n, such as letters (A, B, C, etc.), and time information of the shooting. Furthermore, time information includes, for example, the time each preview image P was taken, information indicating how many minutes ago the image was taken, and information indicating how many minutes ago the latest preview image P was taken. By displaying the sequence information along with the preview image P in this way, it is possible to prevent users from losing track of what positioning adjustments were made to the currently displayed preview image P.

[0120] Furthermore, the second control unit 311 may be configured to display the positioning determination result on the tube display unit 33a together with the pre-image (for example, superimposed) when the console 2 has performed the positioning determination process. Specifically, in the positioning determination process, if console 2 determines, for example, that a lung field is missing, the second control unit 311 generates an image of the missing portion and overlays it onto the pre-image.

[0121] Furthermore, the second control unit 311 may display on the tube display unit 33a the information that the console 2 displayed on the display unit 24 when it performed the operation decision process (step S38) (for example, an indication that the operation decision process will start, the options for the next operation to be performed (main shooting, pre-shooting, end of shooting), the selected next operation, etc.), and when at least one of the irradiation instruction switch 32 and the tube operation unit of the tube 33 (not shown, for example, a touch panel type selection button provided on the tube display unit 33a) is operated, the second control unit 311 may determine the next operation to be performed (main shooting, pre-shooting, or end of shooting) on ​​behalf of the console 2 based on these operation modes. In this way, after reviewing the positioning, the user can select the next operation simply by operating the irradiation instruction switch 32 on the spot, without having to return to the control room to check the display content of the console 2's display unit 24 or operate the operation unit 25. As a result, the time from the completion of positioning to the next radiation irradiation can be shortened, and the possibility of positioning shifting during that time can be reduced.

[0122] Furthermore, the second control unit 311 may cause the visible light camera (not shown) provided in the light tube 33 to photograph the area irradiated with radiation R when performing pre-imaging. The visible light camera may be integrated with the housing of the tube 33, or it may be in a separate housing and attached to the tube 33. Alternatively, the visible light camera may be integrated with the housing of a collimator (not shown), which is usually provided at the radiation irradiation port of the tube 33 and controls the irradiation range of radiation R or irradiates the subject S with field light indicating the irradiation range, or it may be in a separate housing and attached to the collimator. Furthermore, the visible light camera can generate a visible light image of the positioned subject S by capturing images of the area irradiated by radiation R. Furthermore, the visible light camera is capable of communicating with one or more of the devices 1 to 3 via the communication network N. The communication network N may be wired, wireless, or a combination of wired and wireless communication.

[0123] Furthermore, the visible light camera receives instructions to generate a visible light image via the communication network N, generates a visible light image based on the instructions, and sends the generated visible light image to the specified device. For example, the generator 31 receives instructions to generate a visible light image and instructions to send the acquired image to the console 2. The generator 31 notifies the visible light camera of the timing information for the start of pre-shooting, generates a visible light image at that timing, and immediately sends the visible light image to the console 2 after generation. Note that the instructions to generate a visible light image for the visible light camera and the instructions to send the generated image to console 2 may be given by console 2 instead of generator 31. The communication unit 23 of console 2 receives a visible light image, and the control unit 21 associates the visible light image with its corresponding pre-image and stores it in the storage unit 22. This process is performed each time a pre-image is taken. This allows visible light images that show the positioning state of the subject S at each pre-image to be stored linked to the corresponding pre-image.

[0124] Furthermore, when the console 2 displays a pre-image on the display unit 24, it displays a visible light image corresponding to the pre-image on the display unit 24. This allows the photographer to simultaneously compare the positioning state with the preview image, enabling them to efficiently pinpoint the cause of positioning errors.

[0125] The control unit 21 may also identify the radiation field from the visible light image through image recognition processing, generate a visible light image of the radiation field by extracting the image of the radiation field portion, store it in the storage unit 22 in association with the pre-image, and use it as the visible light image to be displayed on the display unit 24. Furthermore, the control unit 21 may identify the radiation field R from the pre-image using image recognition processing, generate a pre-image of the radiation field portion by extracting an image of the radiation field portion, store it in the storage unit 22 in association with the pre-image, and use it as the pre-image to be displayed on the display unit 24. By simultaneously displaying the visible light image of the illumination field and the pre-image of the illumination field on the display unit 24, the display ranges of the two images coincide, allowing the photographer to more efficiently pinpoint the cause of positioning errors. Furthermore, efficiency can be further improved by matching the display sizes of the two images when displaying the visible light image of the illumination field and the pre-image of the illumination field on the display unit 24.

[0126] Furthermore, when displaying the visible light image and the pre-image, they may be displayed side by side or superimposed. When superimposing them, misalignment can be prevented by aligning the illumination field area of ​​the visible light image with that of the pre-image. Furthermore, if console 2 performs positioning determination processing, the determination result may be displayed on display unit 24 along with these two images (for example, superimposed).

[0127] By the way, when using image recognition processing to identify the field of illumination in a visible light image, identifying the field of illumination based on information about the boundaries of the illumination field light captured in the visible light image reduces the likelihood of identification errors. However, since the illumination field light is usually switched ON / OFF based on operations such as the operation button on the collimator, the operation button 25 on console 2, and the tube operation unit which is a combination of the tube front 33a and the touch panel stacked thereon, the illumination field light is not necessarily ON at the start of pre-shooting.

[0128] To address this, the collimator is made capable of communicating with one or more of the devices 1-3 via the communication network N, and the generator 31 or console 2 sends an instruction to the collimator to turn on the illumination field light at the start of pre-imaging based on the pre-imaging start timing information. The collimator should then follow the instructions and turn on the field of view light. This ensures that the field of view light is reliably reflected in the visible light image, thereby reducing errors in identifying the field of view.

[0129] Furthermore, while we have described the method of displaying the pre-image, its corresponding visible light image, and positioning determination result on the display unit 24 of the console 2, the display location is not limited to the display unit 24. For example, if the image is displayed on the tube display unit 33a, after pre-shooting is complete, when the user needs to readjust the positioning, they can refer to the pre-shoot image and visible light image displayed on the tube display unit 33a and consider any necessary adjustments on the spot. Furthermore, while displaying only a preview image requires users to infer positioning from the radiation image (preview image), displaying both the preview image and the visible light image eliminates the need for inference, increasing efficiency and improving the accuracy of positioning adjustments.

[0130] As previously explained, the method for displaying multiple pre-images on the tube display unit 33a is the same even when a visible light image is present. In other words, similar to the pre-image, it is preferable to display multiple visible light images on the tube display unit 33a. When doing so, displaying the associated pre-image and visible light images as a set (for example, side by side or superimposed) makes it easier for the user to compare the pre-image and the visible light images.

[0131] Furthermore, while we have described methods using visible light images from a visible light camera, the method is not limited to visible light images, as long as it allows the user to understand the positioning. For example, instead of visible light images, infrared images taken with an infrared camera may be used. Because infrared light has a longer wavelength than visible light, it can penetrate clothing and capture images of the subject S's skin. Therefore, it produces images that are more suitable for positioning than visible light images, improving positioning accuracy. Alternatively, a depth image from a time-of-flight (TOF) camera, which can generate a distance image that visualizes the distance from the camera to an object, may be used instead of a visible light image. A depth image changes the coloring of each pixel according to the distance. For example, even with the same subject S, changing the angle of subject S changes the distance from the camera to subject S, and therefore the coloring changes. By using a depth image instead of a visible light image, it becomes easier to grasp the change in the angle of subject S, and thus easier to grasp the angle of positioning.

[0132] Furthermore, while we have described configurations that use infrared images or depth images instead of visible light images, it is also possible to combine one or more of these images. By combining these images, it becomes possible to generate multiple pieces of information that can only be obtained from each individual image, allowing for a better understanding of positioning and making positioning adjustments easier.

[0133] <4. Others> Next, we will describe some variations of the above-mentioned imaging control devices 2, 31A, 4 or systems 100, 100A, 100B.

[0134] [Example 1] In both the pre-image confirmation mode and the short-time shooting mode, the shooting conditions for the main shoot are derived based on the pre-image. Therefore, if the pre-image contains a lot of noise, the accuracy of deriving the shooting conditions for the main shoot will decrease. Therefore, regardless of which control mode is being used, the control unit 21 will, from before the start of pre-shooting until at least the end of pre-shooting, suppress the generation of noise from other devices (not shown) that generate electromagnetic waves that are the source of noise (e.g., oscillating grid, phototimer type automatic exposure mechanism (AEC), etc.) by keeping them in a state where the noise generation is suppressed (e.g., power is turned off, power consumption is reduced). It may be possible to maintain a state where the force is suppressed.

[0135] In this case, the state that suppresses noise generation may be maintained until the main shooting is completed. Doing so simplifies the processing performed between the end of pre-shooting and the start of main shooting, thereby shortening the time between the end of pre-shooting and the start of main shooting.

[0136] [Differentiation 2] Furthermore, in the above-described shooting control process, the control unit 21 may compare the heat unit values ​​of the tube 33 and the generator 31 with a preset limit value before performing pre-shooting, and if it determines that the heat unit values ​​exceed the limit value, it may not permit subsequent shooting. In this case, the control unit 21 may obtain the heat unit value by, for example, calculating the increase in the heat unit value when shooting under the set shooting conditions, or by estimating it by referring to a table showing the relationship between shooting conditions and the increase in value.

[0137] Furthermore, even if the heat unit value does not exceed the limit before the pre-shooting begins and pre-shooting can be performed, if the heat unit value exceeds the limit before the main shooting begins, the main shooting must be delayed until the heat unit value decreases. In this case, the subject S may move relatively significantly, making it difficult to combine the pre-shoot and main images. Therefore, in short-time shooting mode, it is desirable for the control unit 21 to check whether the heat unit value (maximum heat unit value) after pre-shooting and main shooting will exceed a limit value before starting pre-shooting, and to not permit shooting if it does exceed the limit. Before starting pre-imaging, the irradiation time or tube current-time product to be used for the main imaging is not yet determined. Therefore, the heat unit value is calculated using the voltage value, tube current value, and the upper limit of the sum of the irradiation time during pre-imaging and the irradiation time during the main imaging, or the upper limit of the sum of the tube voltage value, tube current-time product during pre-imaging and the tube current-time product during the main imaging. This allows us to determine the maximum value of the heat unit.

[0138] Furthermore, in pre-image confirmation mode, before pre-shooting begins, the upper limits of the tube voltage, tube current, and irradiation time to be used for the main shoot, or the upper limits of the tube voltage, tube current-time product to be used for the main shoot, are displayed. In configurations that allow changing at least one of the following values: tube voltage, tube current, irradiation time, and tube current-time product, it is desirable to determine the heat unit value (maximum heat unit value) after pre-shooting and main shooting in the same manner as in the short-time shooting mode described above, check whether it exceeds the limit value, and if it does, not permit shooting. On the other hand, in the case where the shooting conditions for the main shoot are not displayed before the pre-shoot, the control unit 21 may check the heat unit value after the pre-shoot has finished before the pre-shoot starts, and check the heat unit value after the main shoot has finished before the main shoot starts, or use a predetermined upper limit of the irradiation time or tube current time product of the main shoot to determine the heat unit value (maximum heat unit value) after the pre-shoot and main shoot are completed in the same manner as the short-time shooting mode described above, and check whether the heat unit value after the pre-shoot and main shoot will exceed the limit value, and if it does, it may not permit shooting.

[0139] [Difference 3] Furthermore, as shown in Figure 13, for example, the system 100 may be able to communicate with the dose management system 200 via the communication network N. Furthermore, the system 100 may transmit the subject ID, imaging procedure, imaging results, radiation dose, etc., to the dose management system 200 each time imaging is performed. When the dose management system 200 receives various information from the system 100, it calculates the cumulative exposure dose, re-imaging rate, etc., for each subject S based on the received information, and manages the calculated values ​​in the form of a table T2, for example, as shown in Figure 14(a). Furthermore, the dose management system 200 may be configured to manage the exposure dose for at least one of the imaging site and each imaging procedure.

[0140] In this case, during the imaging control process, the control unit 21 may switch the control mode based on a numerical value managed by the dose management system. Specifically, for example, before executing the acquisition process, the control unit 21 retrieves the re-imaging rate of the subject S to be photographed from the dose management system 200. The control unit 21 then switches to pre-image confirmation mode if it determines that the recalled re-shooting rate is above a preset threshold, and switches to short-time shooting mode if it determines that it is below the threshold.

[0141] For example, if we are about to take an image of the lateral side of the knee joint of subject S, whose ID is A, then according to table T2 shown in Figure 14(a), the re-imaging rate will be called up from the dose management system 200. Since this becomes 20%, the control unit 21 switches the control mode to pre-image confirmation mode. Furthermore, in the configuration described above, the control unit 21 may select the control mode based not on the rescanning rate over the patient's lifetime, but rather on the rescanning rate over a recent predetermined period (e.g., one year). The rescanning rate varies depending on the patient S's age, whether or not they have a history of previous surgeries, etc. Therefore, the above configuration makes it possible to select a control mode that is more in line with the actual condition of the patient S.

[0142] Furthermore, when the dose management system 200 receives various information from the system 100, it may calculate the re-imaging rate for each user based on the received information and manage the calculated values ​​in the form of a table T3, for example, as shown in Figure 14(b). Furthermore, the control unit 21 may be configured to switch the control mode based on the user's re-scan rate, rather than the subject S's re-scan rate. Specifically, the control unit 21 switches to pre-image confirmation mode if it determines that the re-shooting rate of the called user is above a predetermined threshold, and switches to short-time shooting mode if it determines that it is below the threshold. Furthermore, even when using the user's rescan rate, the control mode may be selected based on the rescan rate over a predetermined period (e.g., one year). The user's rescan rate changes depending on the user's experience level, etc. Therefore, the above approach makes it possible to select a control mode that is more in line with the actual user's condition.

[0143] <5. Effects> The shooting control devices 2, 31A, 4 or systems 100, 100A, 100B described above switch the control mode of the control unit 21 between a pre-image confirmation mode, which displays a pre-image after pre-shooting, and a short-time shooting mode, which performs main shooting without displaying a pre-image after pre-shooting, and notifies whether the control unit 21 is controlling in pre-image confirmation mode or short-time shooting mode. Therefore, with the imaging control devices 2, 31A, 4 or systems 100, 100A, 100B, when performing two-stage radiography, pre-imaging and main imaging, the same equipment can handle two types of imaging where the possibility of imaging failure differs due to differences in imaging attributes, and the user can reliably determine whether or not a pre-image is displayed after pre-imaging.

[0144] <6. Others> Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to the above embodiments, and can be modified as appropriate without departing from the spirit of the invention.

[0145] Furthermore, while the above description discloses examples using hard disks, semiconductor non-volatile memory, etc., as computer-readable media for the program according to the present invention, the invention is not limited to these examples. Portable recording media such as CD-ROMs can also be used as other computer-readable media. In addition, carrier waves can be used as a medium for providing the data of the program according to the present invention via a communication line. [Explanation of symbols]

[0146] 100, 100A, 100B Radiography System 1 detector 2. Console (camera control device) 21 Control Unit 22 Memory section 23 Communications Department 24 Display 25 Control section 2A Console 3.3A Generator 31 Generator 311 Second Control Unit 312 Second memory section 313 Second Communications Department 314 High-voltage generation unit 31A Generator (Image Control Device) 32. Irradiation Indicator Switch 33 Tube 4. Shooting control device 200 Dose Management System I icon N Communication Network n number R radiation S Subject

Claims

1. In a radiography system having imaging control means for controlling radiography, including dynamic radiography, A mode switching means for switching the control mode of the imaging control means between a first imaging mode in which radiography is performed with a single irradiation command and a second imaging mode in which radiography is performed with multiple irradiation commands, It has a user-operable control unit, The second shooting mode is a radiography system that allows the shooting conditions of the radiography to be changed based on operations performed by the user on the control unit between the completion of the first radiography performed by the irradiation instruction and the start of the second radiography performed by the next irradiation instruction.

2. The radiography system according to claim 1, wherein the radiography imaging conditions are the irradiation conditions of the radiation emitted from the tube.

3. The radiography system according to claim 2, wherein at least one of the irradiation conditions, the tube voltage value, the tube current value, the irradiation time, and the tube current-time product, is changeable.

4. The radiography system according to claim 2, wherein the irradiation conditions include parameters that cannot be changed by user operation.

5. The radiation imaging system according to claim 2, wherein the imaging control means displays the upper limit of the irradiation conditions on the display means.

6. The system further includes a positioning determination means for determining whether the positioning of the subject is appropriate, The radiography system according to any one of claims 1 to 5, wherein the positioning determination means determines whether the positioning is appropriate based on the radiographic image obtained in the first radiography when the shooting control means performs control in the second shooting mode.

7. The radiography system according to any one of claims 1 to 6, further comprising a mode notification means for notifying which control mode the shooting control means is using, the first shooting mode or the second shooting mode, before performing the radiography.

8. The radiography system according to claim 1, wherein when the shooting control means performs control in the first shooting mode, the shooting conditions for the second radiography are determined based on the radiographic image obtained in the first radiography.

9. The radiography system according to claim 1, wherein the mode switching means switches the control mode of the imaging control means based on imaging attribute information included in the inspection information.

10. A shooting control means for controlling radiographic imaging, including dynamic imaging, A mode switching means for switching the control mode of the imaging control means between a first imaging mode in which radiography is performed with a single irradiation command and a second imaging mode in which radiography is performed with multiple irradiation commands, It has a user-operable control unit, The second shooting mode is a shooting control device that can change the shooting conditions for the radiography based on operations performed by the user on the operating unit between the completion of the first radiography based on the irradiation instruction and the start of the second radiography based on the next irradiation instruction.

11. In a radiography method using a radiography system having imaging control means for controlling radiography, including dynamic radiography, The control mode of the imaging control means includes a mode switching step of switching between a first imaging mode in which radiography is performed with a single irradiation instruction and a second imaging mode in which radiography is performed with multiple irradiation instructions. The second shooting mode is a radiography method that modifies the shooting conditions of the radiography based on operations performed by the user between the completion of the first radiography performed by the irradiation instruction and the commencement of the second radiography performed by the next irradiation instruction.

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