Radiography equipment, radiation imaging support method, and radiation imaging support program

Abstract

To reduce the burden on technicians when taking radiographic images. [Solution] The radiographic imaging device comprises: an imaging unit that captures radiographic images of a target area of ​​a subject in frame units during a predetermined operation; an identification unit that, during imaging, determines in frame units whether or not the skeleton of the target area is in a reference position for the captured radiographic images, and identifies the radiographic image when the skeleton of the target area is in a reference position as the reference position image; and a notification unit that provides notification based on whether or not the reference position image has been identified.

Description

Technical Field

[0001] The present invention relates to a radiation imaging apparatus, a radiation imaging support method, and a radiation imaging support program.

Background Art

[0002] In an imaging apparatus that captures a radiation image, positioning of a target part of a patient with respect to the imaging direction (main irradiation direction of radiation) is important for performing a diagnosis based on the radiation image. If the positioning of the target part with respect to the imaging direction is not appropriate, the radiation image will be captured repeatedly, increasing the burden on the patient and the technician who operates the imaging apparatus.

[0003] Therefore, for example, in the apparatus disclosed in Patent Document 1, imaging for positioning operation is performed before main imaging, it is determined whether the measurement region is appropriate from the captured fluoroscopic image, and if the measurement region is not appropriate, a notification is given to the technician who operates the apparatus. As a result, the technician can perform the positioning operation by referring to the fluoroscopic image and can also confirm whether the positioning is correct before the main imaging.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, even when using the apparatus disclosed in Patent Document 1, if the measurement region is not appropriate, the technician still needs to perform a positioning operation, and the burden is still not small. In particular, for a technician with little experience, performing a positioning operation by referring to a fluoroscopic image is a significant burden.

[0006] The object of the present invention is to provide a radiographic imaging apparatus, a radiographic imaging support method, and a radiographic imaging support program that can reduce the burden on the technician when taking radiographic images. [Means for solving the problem]

[0007] The radiation imaging apparatus according to the present invention is An imaging unit that captures radiographic images of a target area of ​​a subject during a predetermined operation, frame by frame, During imaging, the system includes a determination unit that determines, on a frame-by-frame basis, whether the skeleton of the target part is in the reference position in the captured radiographic image, and identifies the radiographic image in which the skeleton of the target part is in the reference position as the reference position image, A notification unit that provides notification based on whether or not the aforementioned reference position image has been identified, It is equipped with.

[0008] The radiation image acquisition support method according to the present invention is In a radiographic imaging device, Radiographic images of the target area of ​​the subject during a predetermined operation are captured frame by frame. During imaging, the system determines, on a frame-by-frame basis, whether the skeleton of the target area is in the reference position in the captured radiographic image, and identifies the radiographic image in which the skeleton of the target area is in the reference position as the reference position image. Notification is given based on whether or not the aforementioned reference position image has been identified.

[0009] The radiographic image acquisition support program according to the present invention is In the computer of the radiographic imaging device, A process for capturing radiographic images of the target area of ​​the subject on a frame-by-frame basis during a predetermined operation, During imaging, the process involves determining, on a frame-by-frame basis, whether the skeleton of the target part is in the reference position in the captured radiographic image, and identifying the radiographic image in which the skeleton of the target part is in the reference position as the reference position image. A process to provide notification based on whether or not the aforementioned reference position image has been identified, Make it run. [Effects of the Invention]

[0010] According to the present invention, the burden on technicians during the acquisition of radiographic images can be reduced. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 is an explanatory diagram illustrating an example of the configuration of a radiation image processing system according to an embodiment of the present invention. [Figure 2] Figure 2 is a block diagram illustrating an example of the functional configuration of the imaging control unit in a radiographic imaging device that constitutes a radiographic image processing system. [Figure 3] Figure 3 is a block diagram illustrating an example of the functional configuration of a radiography control device that constitutes a radiographic image processing system. [Figure 4] Figure 4 is a block diagram illustrating an example of the functional configuration of a radiation image analysis device that constitutes a radiation image processing system. [Figure 5] Figure 5 is a flowchart illustrating the radiographic imaging support method performed using a radiographic imaging device. [Figure 6] Figure 6 illustrates the shooting direction, reference position (judgment criteria), action, recognition, measurement target, and reference position image for each target area. [Figure 7] Figure 7 shows an example of a frame image in the most forward flexion position during cervical spine extension and flexion. [Figure 8] Figure 8 shows an example of a frame image in the maximal flexion position during cervical spine extension and flexion. [Figure 9] Figure 9 is a schematic diagram showing an example of frame images in a normal state during ulnar and radial deviation movements of the wrist joint. [Figure 10] Figure 10 is a schematic diagram showing an example of frame images in a state of dynamic ulnar impaction syndrome during ulnar and radial deviation movements of the wrist. [Figure 11] FIG. 11 is a diagram showing an example of a frame image indicating the arrangement state of the humeral head with respect to the glenoid fossa of the shoulder joint during the abduction and elevation movement of the shoulder joint. [Figure 12] FIG. 12 is a diagram showing an example of a frame image indicating the arrangement state of the greater tubercle during the internal rotation and external rotation movements of the shoulder joint. [Figure 13] FIG. 13 is a diagram showing an example of a frame image indicating the arrangement state of the femoral head and the acetabular roof during the abduction movement of the thigh. [Figure 14] FIG. 14 is a diagram showing an example of a frame image indicating the state of the knee joint during the loaded movement of the knee joint. [Figure 15] FIG. 15 is a diagram showing an example of a frame image indicating the state of the knee joint during the internal rotation and external rotation movements of the knee joint. [Figure 16] FIG. 16 is a diagram showing an example of a photographing method in the axial direction of the knee joint. [Figure 17A] FIG. 17A is a schematic diagram of a frame image obtained by photographing the knee joint from the axial direction, and is an example of a reference position image. [Figure 17B] FIG. 17B is a schematic diagram of a frame image obtained by photographing the knee joint from the axial direction, and is an example where the knee flexion angle is small and it is not a reference position image. [Figure 17C] FIG. 17C is a schematic diagram of a frame image obtained by photographing the knee joint from the axial direction, and is an example where the knee flexion angle is large and it is not a reference position image.

Embodiments for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0013] <Configuration of the Radiographic Image Processing System> FIG. 1 is a diagram for explaining the radiographic image processing system 1 of the present embodiment. The radiographic image processing system 1 includes a radiographic image capturing device 10, a radiographic imaging control device (console device) 20, a radiographic image analysis device 30, an image management device 40, and a client terminal 50.

[0014] In the example shown in Figure 1, the radiography imaging device 10 is located in the imaging room, and the radiography control device 20 is located in the control room. The radiography imaging device 10, the radiography control device 20, the radiography image analysis device 30, the image management device 40, and the client terminal 50 are connected to each other via a communication network N. As the communication network N, for example, a communication network conforming to the DICOM (Digital Image and Communications in Medicine) standard is used.

[0015] Furthermore, a radiation information terminal 60, which functions as a radiation information system, is connected to the communication network N to transmit information related to radiation examinations, such as patient examination order information, to the radiation image processing system 1. Examples of radiation information terminals 60 include RIS (Radiology Information System).

[0016] The radiography imaging device 10 performs dynamic radiography (hereinafter referred to as dynamic radiography), which is the acquisition of dynamic images of radiographic images, based on the control of the radiography control device 20. In this embodiment, as will be described later, the radiography imaging device 10 identifies the radiographic image taken when the subject is at a reference position as the reference position image from among the dynamic images, which include multiple radiographic images. The radiography control device 20 controls the radiography imaging device 10 based on examination order information and the like transmitted from the radiography information terminal 60. The radiography control device 20 also transmits the dynamic images generated by the radiography imaging device 10 and the identified reference position images to the radiographic image analysis device 30 and the image management device 40. The radiographic image analysis device 30 performs dynamic analysis on the dynamic images and transmits the analysis results of the dynamic analysis to the image management device 40. The image management device 40, as a medical image management system, manages the transmitted dynamic images, reference position images, and analysis results. The image management device 40 may be, for example, a PACS (Picture Archiving and Communication System). The client terminal 50 acquires dynamic images, reference position images, and analysis results from the image management device 40 and provides them to medical professionals such as doctors for viewing.

[0017] In this embodiment, motion imaging refers to obtaining multiple frame images by repeatedly irradiating a subject with pulsed radiation (e.g., X-rays) at a predetermined frame rate (pulsed irradiation). Motion image refers to a series of frame images obtained by motion imaging. Motion analysis refers to analytical processing applied to motion images, and includes not only processing to analyze the movement of a subject based on the motion image, but also processing to enhance or reduce (remove) predetermined structures by analyzing the motion image.

[0018] The radiographic imaging device 10, the radiographic imaging control device 20, and the radiographic image analysis device 30 each have a processor and memory. The radiographic imaging device 10, the radiographic imaging control device 20, and the radiographic image analysis device 30 are a type of computer that realize predetermined functions by reading, expanding, and executing programs stored in memory.

[0019] [Radiological imaging device 10] As shown in Figure 1, the radiation imaging apparatus 10 comprises an imaging control unit 11, a radiation irradiation unit 12, an imaging table 13, a radiation detection unit 14, a display unit 15, an audio output unit 16, and an operation unit 17.

[0020] The imaging control unit 11 acquires setting information regarding dynamic imaging settings from the radiation imaging control device 20. Based on the setting information, the imaging control unit 11 sets the imaging conditions for dynamic imaging, and based on these imaging conditions, controls the radiation irradiation unit 12 to irradiate the patient (subject) with radiation and perform imaging. The imaging control unit 11 is composed of a CPU (Central Processing Unit), RAM (Random Access Memory), ROM (Read Only Memory), etc.

[0021] The setting information refers to information regarding the settings for performing dynamic imaging of a patient. The setting information is set in the radiography control device 20, described later, by the operator of the radiography image processing system 1, for example, a radiographer.

[0022] The imaging conditions include various factors such as pulse rate, pulse width, pulse interval, number of frames per scan, radiation dose per unit time, movement of the patient's target area T, and respiratory status. The pulse rate is the number of radiation doses per second and corresponds to the frame rate of the image data. The pulse width is the radiation duration per radiation dose. The pulse interval is the time from the start of one radiation dose to the start of the next and corresponds to the time interval (frame interval) between multiple image data. The imaging conditions can be automatically determined by the imaging control unit 11 of the radiation imaging device 10 based on the setting information.

[0023] The radiation irradiation unit 12 is positioned opposite the radiation detection unit 14. The radiation irradiation unit 12 irradiates radiation according to the control of the imaging control unit 11.

[0024] The radiation detection unit 14 is composed of a semiconductor image sensor such as an FPD (Flat Panel Detector). The radiation detection unit 14 has a substrate on which a plurality of detection elements (pixels) are arranged in a matrix. Each pixel on the substrate detects the radiation irradiated from the radiation irradiation unit 12 according to its intensity, and converts the detected radiation into an electrical signal for storage. Each pixel on the substrate is composed of a switching unit such as a TFT (Thin Film Transistor).

[0025] The radiation detection unit 14 controls the switching unit of each pixel based on the image reading conditions input from the radiation imaging control device 20 to read the electrical signal accumulated in each pixel and outputs intensity information for each pixel to the image generation unit 113. The image reading conditions include, for example, the frame rate, frame interval, pixel size, and image size (matrix size). The frame rate is the number of frame images acquired per second and is the same as the pulse rate. The frame interval is the time from the start of one image data acquisition operation to the start of the next frame image acquisition operation and is the same as the pulse interval.

[0026] The imaging control unit 11 and the radiation detection unit 14 are connected to each other and exchange synchronization signals to synchronize the radiation irradiation operation and the image reading operation.

[0027] In Figure 1, the radiation detection unit 14 is shown as being fixed to the imaging table 13, but a wireless type that can be freely positioned may also be used as the radiation detection unit 14. In this case, the radiation detection unit 14 can be positioned appropriately according to the target area of ​​the patient.

[0028] Thus, the radiation imaging device 10 irradiates radiation through the radiation irradiation unit 12 under the control of the imaging control unit 11. The radiation imaging device 10 then performs dynamic imaging of radiation images by generating image data based on the radiation intensity of the irradiated radiation through the radiation detection unit 14. In this embodiment, the imaging control unit 11, the radiation irradiation unit 12, and the radiation detection unit 14 correspond to the imaging unit in the present invention. In this embodiment, the imaging unit captures radiation images of the target area T of the subject during a predetermined operation, frame by frame.

[0029] The display unit 15 and the audio output unit 16 provide instructions to the patient regarding predetermined movements of the target area T, respiratory status, etc., when performing dynamic imaging of the target area T of the patient. The display unit 15 is a display device such as a CRT (Cathode Ray Tube), liquid crystal display (Liquid Crystal Display), or organic EL (Electro Luminescence) display, and has a display screen. The audio output unit 16 is an audio output device such as a speaker. The audio output unit 16 provides instructions to the patient regarding predetermined movements of the target area T, respiratory status, etc., for example, by auto-voice. The display unit 15 and the audio output unit 16 may each provide the same instructions to the patient, or only one of them may provide instructions.

[0030] As a predetermined operation for the target area T, an example of an operation corresponding to the target area T is shown in Figure 6, described later. All of the operations corresponding to the target area T include a state in which the skeleton of the target area T returns to a reference position during the operation.

[0031] The control unit 17 is an input device used by the operator when operating the radiographic imaging device 10 in the imaging room. The control unit 17 is, for example, a keyboard equipped with cursor keys, numeric input keys and various function keys, a pointing device such as a mouse or trackball, and an operating device such as a touch panel. The control unit 17 generates instruction signals based on the operator's input and outputs them to the imaging control unit 11. The control unit 17 also includes an exposure switch (not shown). The exposure switch is a switch used by the operator to instruct the radiographic imaging device 10 to irradiate and take images.

[0032] Figure 2 is a block diagram illustrating an example of the functional configuration of the imaging control unit 11 in the radiation imaging apparatus 10 that constitutes the radiation image processing system 1. The imaging control unit 11 includes a setting information acquisition unit 111, an imaging condition determination unit 112, an image generation unit 113, a storage unit 114, a specification unit 115, and a notification unit 116.

[0033] The setting information acquisition unit 111 acquires setting information from the radiation imaging control device 20.

[0034] The imaging condition determination unit 112 determines the imaging conditions for performing dynamic imaging of the patient based on the setting information.

[0035] For example, in the case of screening or emergency situations, the imaging condition determination unit 112 determines the imaging conditions by having the operator select at least one imaging condition from a plurality of predefined imaging conditions. Alternatively, the imaging condition determination unit 112 may have the operator select examination order information and determine the imaging conditions based on the selected examination order information.

[0036] The image generation unit 113 performs dynamic imaging of the target area T of the patient based on the determined imaging conditions and generates multiple frames of radiographic images. Specifically, the image generation unit 113 controls the operation of the radiation irradiation unit 12 and the radiation detection unit 14 based on the imaging conditions, and generates image data by acquiring intensity information regarding the radiation intensity transmitted through the subject from the radiation detection unit 14 for each pixel. In this way, radiographic images are captured.

[0037] The memory unit 114 stores information regarding shooting conditions and other related information in advance.

[0038] The identification unit 115 determines, frame by frame, whether the skeleton of the target area T is in a reference position in the captured radiation image during imaging. The identification unit 115 then identifies the radiation image in which the skeleton of the target area T is in a reference position as the reference position image. For example, the identification unit 115 has an image analysis unit that performs image analysis of the radiation image frame by frame, and determines whether the skeleton of the target area T is in a reference position based on the analysis results of the image analysis unit, and identifies the reference position image. For example, the image analysis unit recognizes and measures the object of recognition and measurement shown in Figure 6 below through image analysis, and determines whether the skeleton of the target area T is in a reference position based on the recognition and measurement results, and identifies the reference position image. In this case, the image analysis unit may, for example, use a machine learning model to recognize and measure the object.

[0039] The notification unit 116 provides notification based on whether or not a reference position image has been identified. For example, the notification unit 116 uses the audio output unit 16 to output a sound when the skeleton of the target part T is at the reference position during a predetermined operation. Alternatively, the notification unit 116 may use the audio output unit 16 to increase the volume of the sound as the skeleton of the target part T approaches the reference position during a predetermined operation. Furthermore, the notification unit 116 may use the display unit 15 to display information on the display screen of the display unit 15 indicating that the skeleton of the target part T has reached the reference position when the skeleton of the target part T is at the reference position during a predetermined operation.

[0040] By including the aforementioned specific unit 115 and notification unit 116, the radiation image acquisition device 10 also functions as a radiation image acquisition support device that assists the operator when acquiring a radiation image (reference position image) at a reference position.

[0041] [Radiography control device 20] The radiography control device 20 is, for example, a computer such as a PC (Personal Computer) or workstation. The radiography control device 20 may be a desktop computer, as shown in the example in Figure 1, or it may be a portable computer, such as a laptop computer or tablet computer.

[0042] The radiography control device 20 receives inspection order information from the radiography information terminal 60, etc., and transmits it to the radiography imaging device 10, thereby controlling the dynamic imaging of the radiography imaging device 10.

[0043] The examination order information includes various types of information such as instructions for imaging, patient information, examination information, imaging information, and data attributes. The examination information includes information such as the examination ID and the area to be examined. Examination order information is generated, for example, when a doctor requests dynamic imaging of a patient from the radiographic image processing system 1.

[0044] Furthermore, the radiography control device 20 generates setting information based on the operator's input. The operator performs input operations to generate the setting information, for example, by referring to the contents of the examination order information.

[0045] Figure 3 is a block diagram illustrating an example of the functional configuration of the radiography control device 20 that constitutes the radiography image processing system 1. The radiography control device 20 includes a control unit 21, a storage unit 22, an operation unit 23, a display unit 24, and a communication unit 25. Each component of the radiography control device 20 is connected to the others by a bus 26.

[0046] The radiography control device 20 outputs setting conditions set by the operator and other personnel, as well as inspection order information acquired in advance from the radiography information terminal 60, etc., to the radiography imaging device 10, and controls the imaging process performed by the radiography imaging device 10. The radiography control device 20 may also display the dynamic images generated by the radiography imaging device 10, for example, for the operator to review.

[0047] The control unit 21 is composed of a CPU and RAM, etc. In the control unit 21, the CPU reads system programs and various processing programs stored in the memory unit 22 in response to operations on the operation unit 23 and loads them into the RAM. The CPU then controls the operation of each part of the radiography control device 20 based on the loaded programs.

[0048] The storage unit 22 is composed of non-volatile semiconductor memory, a hard disk, or the like. The storage unit 22 stores data such as various programs executed by the control unit 21, parameters necessary for processing by the programs, or processing results (dynamic images, reference position images, etc.). The various programs are stored in the form of readable program code, and the control unit 21 sequentially executes operations according to the program code.

[0049] Furthermore, the memory unit 22 stores image reading conditions for performing dynamic imaging. In addition, the memory unit 22 stores examination order information transmitted from the radiation information terminal 60, etc. When the radiation imaging control device 20 controls the dynamic imaging of the radiation imaging device 10, it reads and transmits the image reading conditions and examination order information corresponding to the patient from the memory unit 22.

[0050] The operation unit 23 is an operating device such as a keyboard equipped with cursor keys, number input keys, and various function keys, a pointing device such as a mouse or trackball, and a touch panel. The operation unit 23 generates instruction signals based on the operator's input and outputs them to the control unit 21.

[0051] The display unit 24 is composed of display devices such as a CRT, liquid crystal display, or organic EL display. The display unit 24 displays input instructions from the operation unit 23 and image data (such as motion images) generated by the radiation imaging device 10, in accordance with the instructions of the display signals input from the control unit 21.

[0052] The communication unit 25 transmits and receives data between the radiation image acquisition device 10, the radiation image analysis device 30, the radiation information terminal 60, etc.

[0053] [Radiation Image Analysis Device 30] The radiation image analysis device 30 is, for example, a computer such as a PC or workstation. The radiation image analysis device 30 may be a desktop computer or a portable computer, such as a laptop or tablet computer.

[0054] The radiographic image analysis device 30 performs dynamic analysis on the dynamic images captured by the radiographic image acquisition device 10 based on the setting information set in the radiographic imaging control device 20.

[0055] Figure 4 is a block diagram illustrating an example of the functional configuration of a radiation image analysis device 30 that constitutes the radiation image processing system 1. The radiation image analysis device 30 includes a control unit 31, a storage unit 32, an operation unit 33, a display unit 34, and a communication unit 35. Each component of the radiation image analysis device 30 is connected by a bus 36.

[0056] The control unit 31 is composed of a CPU and RAM, etc. In the control unit 31, the CPU reads system programs and various processing programs stored in the memory unit 32 in response to operations on the operation unit 33 and loads them into the RAM. Then, based on the loaded programs, the CPU performs operational control and dynamic analysis of each part of the radiation image analysis device 30.

[0057] The control unit 31 includes an image acquisition unit 311 and an analysis unit 312.

[0058] The image acquisition unit 311 acquires a dynamic image, which is a multi-frame radiographic image generated by the radiographic imaging device 10.

[0059] The analysis unit 312 performs dynamic analysis on the dynamic images acquired from the radiation imaging device 10, as set in the configuration information, and obtains the analysis results. At this time, if the analysis unit 312 cannot analyze the dynamic images (cannot obtain analysis results), it determines that analysis is not possible.

[0060] The analysis unit 312 has, for example, a shaping-related measurement mode as a type of dynamic analysis.

[0061] The orthopedic measurement mode measures changes in the position of specified bones, such as in the limbs, and displays the trajectory of their movement.

[0062] The storage unit 32 is composed of non-volatile semiconductor memory, a hard disk, or the like. The storage unit 32 stores various programs executed by the control unit 31, parameters necessary for processing by those programs, or data such as processing results (dynamic images, analysis results, etc.). The various programs are stored in the form of readable program code, and the control unit 31 sequentially executes operations according to the program code.

[0063] Furthermore, the memory unit 32 stores patient information, examination information, and list information indicating the status (for example, progress status such as receiving, dynamic analysis in progress, analysis completed, etc.) related to each dynamic image generated by the radiographic imaging device 10. In addition, the memory unit 32 stores analysis results and measurement results associated with the dynamic images.

[0064] The operation unit 33 is an operating device such as a keyboard equipped with cursor keys, numeric input keys, and various function keys, a pointing device such as a mouse or trackball, and a touch panel. The operation unit 33 generates instruction signals based on the operator's input and outputs them to the control unit 31. The operation unit 33 may also be equipped with a touch panel on the display screen of the display unit 34, in which case it outputs instruction signals input via the touch panel to the control unit 31.

[0065] The display unit 34 is composed of display devices such as a CRT, liquid crystal display, or organic EL display. The display unit 34 displays input instructions from the operation unit 33 and image data (dynamic image analysis results, measurement results, etc.) generated by the radiation imaging device 10, in accordance with the instructions of the display signals input from the control unit 31.

[0066] The communication unit 35 transmits and receives data between the radiography control device 20 and the image management device 40, etc.

[0067] [Methods for supporting radiographic imaging] Figure 5 is a flowchart illustrating the radiation image acquisition support method performed by the radiation image acquisition device 10. The program for the radiation image acquisition support method described below is included in the program executed by the imaging control unit 11. Figure 6 is a diagram illustrating the imaging direction, reference position (determination conditions), operation, recognition, measurement target, and reference position image for each target area.

[0068] (Step S11) The imaging control unit 11 of the radiographic imaging device 10 sets the reference position (determination condition) of the skeleton of the target area, the movement of the target area, and the targets for recognition and measurement based on the target area and imaging direction of the patient (subject).

[0069] For example, the imaging control unit 11 sets the target area and imaging direction based on inspection order information, which includes information on the target area and imaging direction, transmitted from the radiation information terminal 60 or the like via the radiation imaging control device 20. Then, based on the target area and imaging direction, the imaging control unit 11 sets the reference position (judgment condition) of the skeleton of the target area, the operation of the target area when determining whether the skeleton of the target area is at the reference position, and the targets of recognition and measurement used during the judgment. If there are multiple operations or reference positions (judgment conditions) for the set target area and imaging direction, the radiation imaging device 10 displays the multiple operations and reference positions (judgment conditions) on the display unit 15 so that the operator can select one.

[0070] As illustrated in Figure 6, when the target area is the "cervical spine" and the imaging direction is "lateral," the imaging control unit 11 sets "extended flexion" and "extended flexion" as reference positions (determination conditions) and sets "forward and backward flexion" as the operation. At this time, the imaging control unit 11 sets the "lower edge of the vertebra" as the target for recognition of the cervical spine in the radiographic image of each frame.

[0071] For other target areas, as illustrated in Figure 6, the reference position (judgment condition), action, and targets for recognition and measurement are set based on the target area and the direction of imaging. When the target area is a joint such as the "shoulder joint" or "knee joint," there are multiple actions and reference positions (judgment conditions). Therefore, as described above, the reference position (judgment condition), action, and targets for recognition and measurement are set by presenting multiple actions along with reference positions (judgment conditions) and allowing the operator to select one.

[0072] (Step S12) The radiographic imaging device 10 starts capturing radiographic images (dynamic images) and instructs the patient to move the target area. For example, the operator pressing the exposure switch starts the capture of radiographic images (dynamic images). During imaging, the imaging control unit 11 instructs the patient to move the target area, for example, using an auto-voice system with an audio output unit 16.

[0073] For example, if the target area is the "cervical spine" and the imaging direction is "lateral," the imaging control unit 11 uses an auto-voice system via the audio output unit 16 to instruct the patient to perform forward and backward flexion movements of the cervical spine (see Figure 6).

[0074] The same applies to other target areas; the imaging control unit 11 uses an auto-voice system via the audio output unit 16 to instruct the patient on actions corresponding to the target area and imaging direction (see Figure 6).

[0075] (Step S13) The imaging control unit 11 (specification unit 115) determines, frame by frame, whether the skeleton of the target area is in a reference position in the captured radiographic image during imaging.

[0076] For example, if the target area is the "cervical spine" and the imaging direction is "lateral," the reference positions (determination conditions) are "maximum flexion" and "maximum flexion." The identification unit 115 performs frame-by-frame analysis of the radiographic images in which the cervical spine is flexed and extended during imaging, and through image analysis by the image analysis unit described above, recognizes the "lower edge of the vertebra" which is the target of recognition, and determines whether the cervical spine is in the maximum flexion position or the maximum flexion position.

[0077] The same applies to other target areas. The identification unit 115 performs frame-by-frame analysis of the radiographic images in which the target area is moved during imaging. The image analysis unit then performs image analysis to recognize the target object and determines whether the skeleton of the target area is in a reference position.

[0078] By using a shooting control unit 11 with high information processing capacity, the identification unit 115 performs frame-by-frame determination in real time during shooting.

[0079] (Step S14) The imaging control unit 11 (specification unit 115) proceeds to step S15 if the skeleton of the target area is in the reference position in the radiographic image of the frame being judged (YES), and to step S17 if the skeleton of the target area is not in the reference position (NO).

[0080] (Step S15) If the imaging control unit 11 (identification unit 115) determines in step S14 that the skeleton of the target part is in the reference position (YES), it identifies the radiographic image of the frame being determined as the reference position image.

[0081] (Step S16) The imaging control unit 11 (notification unit 116) notifies that the skeleton of the target part is in the reference position. The notification unit 116 may, for example, use the audio output unit 16 to output a sound when the skeleton of the target part T is in the reference position. The notification unit 116 may also use the audio output unit 16 to increase the volume of the sound as the skeleton of the target part T approaches the reference position. The notification unit 116 may also, for example, use the display unit 15 to display information on the display screen of the display unit 15 indicating that the skeleton of the target part T has reached the reference position.

[0082] (Step S17) The shooting control unit 11 checks whether shooting has finished. If shooting has finished (YES), it terminates the series of processes. If shooting has not finished (NO), it returns to step S13. In other words, the shooting control unit 11 repeats steps S13 to S17 until shooting is finished, performing frame-by-frame judgments and identifications. The shooting control unit 11 checks whether shooting has finished, for example, by checking whether the operator has pressed the exposure switch.

[0083] As described above, the radiographic imaging device 10 can capture dynamic images (multiple radiographic images) of the target area and identify a reference position image. After capturing the dynamic images and identifying the reference position image, the radiographic imaging device 10 transmits the dynamic images and reference position image to the radiographic image analysis device 30, image management device 40, etc., via the radiographic imaging control device 20.

[0084] The radiographic image analysis device 30 analyzes the dynamic images transmitted from the radiographic imaging control device 20 in orthopedic-related measurement mode, and as an analysis result, measures the positional change of a specified bone or displays the trajectory of its movement.

[0085] The analysis results from the radiographic image analysis device 30 are then transmitted to the image management device 40 along with the dynamic images, and can be viewed, for example, by a doctor or other person from a client terminal 50.

[0086] Physicians using client terminal 50 can view reference position images along with dynamic images and analysis results, enabling them to make more accurate diagnoses without re-imaging.

[0087] Here, with reference to Figures 5 and 6, as well as Figures 7 to 17C, a specific example of the above-described method for supporting radiographic image acquisition will be explained.

[0088] [Specific Example 1 - Cervical Spine] Figure 7 shows an example of a frame image in the most forward flexion position during cervical spine extension and flexion. Figure 8 shows an example of a frame image in the most backward flexion position during cervical spine extension and flexion.

[0089] When diagnosing cervical spine function, the imaging control unit 11, for example, based on the examination order information, sets "cervical spine" as the target area and "lateral view" as the imaging direction, as shown in Figure 6. The imaging control unit 11 then sets "flexion and extension" as the action and "maximum flexion" and "maximum flexion" as the reference position and judgment conditions. In addition, the imaging control unit 11 sets "lower edge of the vertebra" as the target for recognition, as shown in Figure 6.

[0090] The radiographic imaging device 10 has the patient flex and extend their cervical spine, and takes dynamic images of the cervical spine from the side during flexion and extension, acquiring dynamic images. At this time, the imaging control unit 11 (specification unit 115) determines, frame by frame, whether the cervical spine is in the "most flexed" or "most extended" position in the captured radiographic image.

[0091] The identification unit 115 recognizes the lower vertebral edges of cervical vertebrae C2 and C7, for example, as shown in Figures 7 and 8, and determines the angles θ1 and θ2 where the extensions of the lower vertebral edges intersect, on a frame-by-frame basis. The identification unit 115 has pre-existing determination angle information for angles θ1 and θ2 when the cervical vertebrae are in the "most flexed" and "most flexed" positions, and compares the angles θ1 and θ2 obtained on a frame-by-frame basis with the determination angle information for angles θ1 and θ2. Based on the comparison result, the identification unit 115 determines whether the cervical vertebrae are in the "most flexed" or "most flexed" position. If the identification unit 115 determines that the cervical vertebrae are in the "most flexed" position, it identifies the radiographic image of the frame during that determination as the reference position image. If the identification unit 115 determines that the cervical vertebrae are in the "most flexed" position, it identifies the radiographic image of the frame during that determination as the reference position image.

[0092] As described above, the identification unit 115 compares the angles θ1 and θ2 obtained on a frame-by-frame basis with the determination angle information for angles θ1 and θ2. Therefore, the notification unit 116 can notify, by sound or information display, that the cervical spine is in the "most flexed" or "most extended" position based on the comparison result, for example, the difference in the compared angles.

[0093] As described above, the radiographic imaging device 10 can determine whether the cervical spine is in the "most flexed" or "most extended" position during imaging of the lateral side of the cervical spine, and if it determines that the cervical spine is in the "most flexed" or "most extended" position, it can identify a reference position image. As a result, the burden on the operator during radiographic imaging can be reduced.

[0094] [Specific Example 2 - Lumbar Spine] In Specific Example 1, we described the cervical spine, but the same processing can be applied to the lumbar spine as a method for supporting radiographic imaging. This allows for the determination of whether the lumbar spine is in the "most flexed" or "most extended" position during lateral imaging of the lumbar spine, and if it is determined to be in the "most flexed" or "most extended" position, a reference position image can be identified. As a result, the burden on the operator during radiographic imaging can be reduced.

[0095] [Specific Example 3 - Wrist Joint] Figure 9 is a schematic diagram showing an example of a frame image in a normal state during ulnar and radial deviation of the wrist joint. Figure 10 is a schematic diagram showing an example of a frame image in a state of dynamic ulnar impaction syndrome during ulnar and radial deviation of the wrist joint.

[0096] When diagnosing the function of the wrist joint, the imaging control unit 11, for example, based on the examination order information, sets the "wrist joint" as the target area and "frontal view" as the imaging direction, as shown in Figure 6. The imaging control unit 11 then sets "ulnar deviation and radial deviation" as the action and "the state in which the ulna is most extended" as the reference position and judgment condition. In addition, the imaging control unit 11 sets the "distance between the ulnar end and the radial end" as the target of measurement, as shown in Figure 6.

[0097] Here, "ulnar deviation" refers to the movement of bending the wrist joint towards the little finger (the direction of the ulna), and "radial deviation" refers to the movement of bending the wrist joint towards the thumb (the direction of the radius).

[0098] The radiographic imaging device 10 has the patient ulnar and radially deviate their wrist joint, and takes dynamic images of the wrist joint from the front during ulnar and radial deviation, thereby acquiring dynamic images. At this time, the imaging control unit 11 (specification unit 115) determines, frame by frame, whether or not the captured radiographic image shows the ulna in its most elevated position.

[0099] The identification unit 115 recognizes the ulnar end and radial end, for example, as shown in Figures 9 and 10, and determines the distance between the ulnar end and radial end, for example, the distance D1 of the ulnar end relative to the radial end, on a frame-by-frame basis. The identification unit 115 has prior determination distance information for the case where the ulna is in its most protruding state, and compares the distance D1 obtained on a frame-by-frame basis with the determination distance information for distance D1. Based on the result of the comparison, the identification unit 115 determines whether or not the ulna is in its most protruding state. If the identification unit 115 determines that the ulna is in its most protruding state, it identifies the radiographic image of the frame during the determination as the reference position image.

[0100] As described above, the identification unit 115 compares the distance D1 obtained on a frame-by-frame basis with the distance information used to determine the distance D1. Therefore, the notification unit 116 can notify, by sound or information display, that the ulna is in its "most protruding state" based on the comparison result, for example, the difference in the compared distances.

[0101] As described above, the radiographic imaging device 10 can determine whether the ulna is in its most elevated position during frontal imaging of the wrist joint, and if it determines that the ulna is in its most elevated position, it can identify a reference position image. As a result, the burden on the operator during radiographic imaging can be reduced.

[0102] [Specific Example 4 - Shoulder Joint] Figure 11 is an example of a frame image showing the position of the humeral head relative to the glenoid fossa of the scapula during abduction and elevation of the shoulder joint.

[0103] When diagnosing the function of the shoulder joint, the imaging control unit 11, for example, based on the examination order information, sets "shoulder joint" as the target area and "front view" as the imaging direction, as shown in Figure 6. The imaging control unit 11 then sets "abduction and elevation" as the movement and sets "the state in which the distance from the glenoid cavity of the scapula to the humeral head is at its maximum" as the reference position and judgment condition. In addition, the imaging control unit 11 sets "the distance between the center of the glenoid cavity and the center of the humeral head" as the target of measurement, as shown in Figure 6.

[0104] Here, "abduction" refers to the movement away from the body's midline, and in this case, it refers to the movement of moving the arm away from the body's midline. Also, "elevation" refers to the movement of raising the arm upward at the shoulder joint. "Abduction and elevation" is the movement of moving the arm away from the body's midline and raising the arm upward.

[0105] The radiographic imaging device 10 has the patient abduct and elevate their shoulder joint, and takes dynamic images of the shoulder joint from the front while it is abducted and elevated, thereby acquiring dynamic images. At this time, the imaging control unit 11 (specification unit 115) determines, frame by frame, whether the distance between the glenoid cavity of the scapula and the humeral head is at its maximum during imaging.

[0106] The identification unit 115 recognizes, for example, the center of the glenoid fossa of the scapula and the center of the humeral head, as shown in Figure 11, and determines the distance D2 between the center of the glenoid fossa and the center of the humeral head on a frame-by-frame basis. The identification unit 115 has pre-existing determination distance information for the case where "the distance from the glenoid fossa to the humeral head is at its maximum," and compares the distance D2 obtained on a frame-by-frame basis with the determination distance information for distance D2. Based on the result of the comparison, the identification unit 115 determines whether or not "the distance from the glenoid fossa to the humeral head is at its maximum." If the identification unit 115 determines that "the distance from the glenoid fossa to the humeral head is at its maximum," it identifies the radiographic image of the frame during that determination as the reference position image.

[0107] As described above, the identification unit 115 compares the distance D2 obtained on a frame-by-frame basis with the distance information used to determine the distance D2. Therefore, the notification unit 116 can notify, by sound or information display, that the distance from the glenoid fossa of the scapula to the humeral head is at its maximum, based on the comparison result, for example, the difference in the compared distances.

[0108] As described above, the radiographic imaging device 10 can determine whether the distance between the glenoid cavity of the scapula and the humeral head is at its maximum during frontal imaging of the shoulder joint. If the radiographic imaging device 10 determines that the distance between the glenoid cavity of the scapula and the humeral head is at its maximum, it can identify a reference position image. As a result, the burden on the operator during radiographic imaging can be reduced.

[0109] [Specific Example 5 - Shoulder Joint] Figure 12 shows an example of frame images illustrating the positioning of the greater tubercle during internal and external rotation of the shoulder joint.

[0110] When diagnosing the function of the shoulder joint, the imaging control unit 11, for example, based on the examination order information, sets "shoulder joint" as the target area and "front view" as the imaging direction, as shown in Figure 6. The imaging control unit 11 then sets "internal rotation and external rotation" as the movement and sets "the state in which the greater tubercle is widest" as the reference position and judgment condition. In addition, the imaging control unit 11 sets "width of the greater tubercle" as the target of measurement, as shown in Figure 6.

[0111] Here, "internal rotation" refers to a movement that brings the body closer to the midline (a movement that rotates inward), while "external rotation" refers to a movement that moves away from the midline (a movement that rotates outward).

[0112] The radiographic imaging device 10 has the patient internally and externally rotate their shoulder joint, and takes dynamic images of the shoulder joint from the front during internal and external rotation, acquiring dynamic images. At this time, the imaging control unit 11 (specification unit 115) determines, frame by frame, whether the acquired radiographic image shows the "greater tubercle in its widest state."

[0113] The identification unit 115 recognizes the major nodule, for example as shown in Figure 12, and determines the area A1 of the major nodule on a frame-by-frame basis. The identification unit 115 has pre-existing determination area information for the case where the major nodule is in its widest state, and compares the area A1 obtained on a frame-by-frame basis with the determination area information for area A1. Based on the comparison result, the identification unit 115 determines whether or not the major nodule is in its widest state. If the identification unit 115 determines that the major nodule is in its widest state, it identifies the radiation image of the frame during the determination as the reference position image.

[0114] As described above, the identification unit 115 compares the area A1 obtained on a frame-by-frame basis with the determined area information of area A1. Therefore, the notification unit 116 can notify, by sound or information display, that the "largest node is in the widest state" based on the comparison result, for example, the difference in the compared areas.

[0115] As described above, the radiographic imaging device 10 can determine whether the greater tubercle is in its widest state during frontal imaging of the shoulder joint, and if it determines that the distance from the glenoid fossa of the scapula to the humeral head is at its maximum, it can identify a reference position image. As a result, the burden on the operator during radiographic imaging can be reduced.

[0116] [Specific example 6 - Thigh] Figure 13 is an example of a frame image showing the position of the femoral head and the acetabulum during abduction of the thigh.

[0117] When diagnosing the function of the thigh, the imaging control unit 11, for example, based on the examination order information, sets "thigh" as the target area and "frontal view" as the imaging direction, as shown in Figure 6. The imaging control unit 11 then sets "abduction" as the action and sets "a state in which the femoral head and the acetabulum are close together" as the reference position and judgment condition. In addition, the imaging control unit 11 sets "the distance between the femoral head and the acetabulum" as the target of measurement, as shown in Figure 6.

[0118] Here, "abduction" refers to the movement away from the midline of the body, and in this context, it means the movement of opening the leg outward at the hip joint.

[0119] The radiographic imaging device 10 has the patient abduct their thigh and takes dynamic images of the thigh from the front while it is abducted, acquiring dynamic images. At this time, the imaging control unit 11 (specification unit 115) determines, frame by frame, whether or not the femoral head and the hip acetabulum are in close proximity in the captured radiographic images.

[0120] The specific unit 115 recognizes the femoral head and the acetabulum, for example, as shown in Figure 13, and determines the distance D3 between the femoral head and the acetabulum on a frame-by-frame basis. Here, the distance D3 is the distance at the point where the space between the femoral head and the acetabulum is narrowest.

[0121] The identification unit 115 has pre-existing determination distance information for the distance D3 when the femoral head and hip acetabulum are in close proximity, and compares the distance D3 obtained on a frame-by-frame basis with the determination distance information for distance D3. Based on the comparison result, the identification unit 115 determines whether or not the femoral head and hip acetabulum are in close proximity. If the identification unit 115 determines that the femoral head and hip acetabulum are in close proximity, it identifies the radiographic image of the frame during the determination as the reference position image.

[0122] As described above, the identification unit 115 compares the distance D3 obtained on a frame-by-frame basis with the distance information used to determine the distance D3. Therefore, the notification unit 116 can notify, by sound or information display, that the femoral head and the acetabulum are in a state of close proximity, based on the comparison result, for example, the difference in the compared areas.

[0123] As described above, the radiographic imaging device 10 can determine whether the femoral head and the hip acetabulum are in close proximity during frontal imaging of the thigh, and if it determines that the femoral head and the hip acetabulum are in close proximity, it can identify a reference position image. As a result, the burden on the operator during radiographic imaging can be reduced.

[0124] [Specific Example 7 - Joints] Here, we will use the knee joint as an example of a joint for explanation. Figure 14 is a diagram showing an example of a frame image illustrating the state of the knee joint during weight-bearing motion.

[0125] When diagnosing the function of the knee joint, the imaging control unit 11 sets, for example, the "knee joint" as the target area and the "frontal view" as the imaging direction, based on the examination order information. The imaging control unit 11 then sets "extension and flexion under load" as the action and sets "the state in which the knee joint is narrowest" as the reference position and judgment condition. In addition, the imaging control unit 11 sets "the distance between the bones of the knee joint" as the target of measurement.

[0126] Here, "extension" refers to the movement of straightening the knee joint, and "flexion" refers to the movement of bending the knee joint. Furthermore, "extension and flexion under load" refers to the movement of extending and flexing the knee joint when a load is applied to the knee joint, for example, when a patient is holding a heavy object.

[0127] The radiographic imaging device 10 has the patient extend and flex their knee joint while holding a heavy object, and takes dynamic images of the knee joint from the front during extension and flexion to acquire dynamic images. At this time, the imaging control unit 11 (specification unit 115) determines, frame by frame, whether the knee joint is in the "most constricted state" in the captured radiographic image.

[0128] The specific unit 115, for example as shown in Figure 14, recognizes the femur and tibia at the knee joint and determines the distance D4 of the joint space between the femur and tibia on a frame-by-frame basis. Here, the distance D4 used is the distance at the point where the space between the femur and tibia is narrowest.

[0129] The identification unit 115 has pre-existing determination distance information for the distance D4 when the knee joint is in its narrowest state, and compares the distance D4 obtained on a frame-by-frame basis with the determination distance information for distance D4. Based on the comparison result, the identification unit 115 determines whether or not the knee joint is in its narrowest state. If the identification unit 115 determines that the knee joint is in its narrowest state, it identifies the radiographic image of the frame during the determination as the reference position image.

[0130] As described above, the identification unit 115 compares the distance D4 obtained on a frame-by-frame basis with the distance information used to determine the distance D4. Therefore, the notification unit 116 can notify, by sound or information display, that the knee joint is in its narrowest state, based on the comparison result, for example, the difference in the compared distances.

[0131] As a result, the radiographic imaging device 10 can determine whether the knee joint is in its narrowest state during frontal imaging of the knee joint, and if it determines that the knee joint is in its narrowest state, it can identify a reference position image. This reduces the burden on the operator during radiographic imaging.

[0132] [Specific Example 8 - Joints] Here, as an example of a joint, we will use the knee joint as an example to explain the process.

[0133] When diagnosing the function of the knee joint, the imaging control unit 11 sets, for example, the "knee joint" as the target area and the "lateral view" as the imaging direction, based on the examination order information. The imaging control unit 11 then sets "extension and flexion" as the rotational movement of the knee joint and sets "the state in which the knee joint is projected most broadly" as the reference position and judgment condition. In addition, the imaging control unit 11 sets "thickness of the knee joint cavity" as the target of measurement.

[0134] The radiographic imaging device 10 has the patient extend and flex their knee joint, and takes dynamic images of the knee joint from the side during extension and flexion, thereby acquiring dynamic images. At this time, the imaging control unit 11 (specification unit 115) determines, frame by frame, whether the captured radiographic image is in the state where the knee joint is projected most broadly.

[0135] The identification unit 115, for example, recognizes the knee joint cavity and determines the thickness of the knee joint cavity on a frame-by-frame basis. The identification unit 115 has pre-existing determination thickness information for the knee joint cavity when the knee joint is in the "widest projection state," and compares the thickness of the knee joint cavity determined on a frame-by-frame basis with this determination thickness information. Based on the comparison result, the identification unit 115 determines whether or not the knee joint is in the "widest projection state." If the identification unit 115 determines that the knee joint is in the "widest projection state," it identifies the radiographic image of the frame during the determination as the reference position image.

[0136] As described above, the specific unit 115 compares the thickness of the knee joint cavity, determined on a frame-by-frame basis, with the determined thickness information. Therefore, the notification unit 116 can notify, by sound or information display, that the knee joint is in the state in which it is projected most broadly, based on the comparison result, for example, the difference in the compared thicknesses.

[0137] As a result, the radiographic imaging device 10 can determine whether the knee joint is in the "widest projection state" during imaging of the lateral side of the knee joint, and if it determines that the knee joint is in the "widest projection state," it can identify a reference position image. As a result, the burden on the operator during radiographic imaging can be reduced.

[0138] [Specific Example 9 - Knee Joint] Figure 15 shows an example of frame images illustrating the state of the knee joint during internal and external rotation movements. Figure 15 is a frame image of the right knee joint taken from the side.

[0139] When diagnosing the function of the knee joint, the imaging control unit 11 sets, for example, the "knee joint" as the target area and the "lateral view" as the imaging direction, based on the examination order information. The imaging control unit 11 then sets "internal rotation and external rotation" as the movement and sets "a state in which the displacement between the ends of the medial and lateral femoral condyles has been eliminated" as the reference position and judgment condition. In other words, a state in which the ends of the medial and lateral femoral condyles are misaligned indicates that the knee joint is not positioned correctly. Therefore, the imaging control unit 11 sets "the ends of the medial and lateral femoral condyles" as the targets for recognition.

[0140] The radiographic imaging device 10 has the patient internally and externally rotate their knee joint, and takes dynamic images of the knee joint from the side during internal and external rotation, acquiring dynamic images. At this time, the imaging control unit 11 (specification unit 115) determines, frame by frame, whether or not the captured radiographic image is in a state where "the displacement between the epiphysis of the medial and lateral femoral condyles has been eliminated."

[0141] The specific unit 115 recognizes, for example, the epiphysis Tx of the medial condyle and the epiphysis Ty of the lateral condyle in the knee joint, as shown in Figure 15, and determines the displacement between epiphysis Tx and epiphysis Ty on a frame-by-frame basis. If there is a displacement between epiphysis Tx and epiphysis Ty, the lines indicating epiphysis Tx and epiphysis Ty are shown as two lines, as shown in Figure 15. In Figure 15, the horizontal direction (left-right direction) of the radiographic image is defined as the X direction, the vertical direction (up-down direction) of the radiographic image is defined as the Y direction, and the direction perpendicular to the X and Y directions, which is the imaging direction (direction of radiation irradiation), is defined as the Z direction.

[0142] The identification unit 115 determines the displacement between the epiphysis Tx and epiphysis Ty. Based on the displacement between epiphysis Tx and epiphysis Ty, the identification unit 115 determines whether or not the "displacement between the epiphysis of the medial and lateral femoral condyles has disappeared." If the displacement between epiphysis Tx and epiphysis Ty is smaller than a predetermined value, the identification unit 115 determines that the "displacement between the epiphysis of the medial and lateral femoral condyles has disappeared," and in this case, it identifies the radiographic image of the frame being determined as the reference position image.

[0143] As described above, the specific unit 115 determines the displacement between the epiphysis Tx and epiphysis Ty on a frame-by-frame basis. Therefore, the notification unit 116 can notify, by sound or information display, that the knee joint is in its narrowest state based on the determination of the displacement between the epiphysis Tx and epiphysis Ty.

[0144] As described above, the radiographic imaging device 10 can determine whether or not the displacement between the epiphysis of the medial and lateral femoral condyles has been eliminated during imaging of the lateral side of the knee joint. If the radiographic imaging device 10 determines that the displacement between the epiphysis of the medial and lateral femoral condyles has been eliminated, it can identify a reference position image. As a result, the burden on the operator during radiographic imaging can be reduced.

[0145] Reference position images of the lateral view of the knee joint, taken in the manner described above, are useful for diagnosing conditions such as osteoarthritis of the knee, rheumatoid arthritis, fractures, ligament injuries, fossil tumors, and metastatic tumors.

[0146] [Specific Example 10 - Knee Joint] Figure 16 shows an example of a method of imaging the knee joint in the axial direction. Here, the Laurin method is shown as an example, but the present invention can also be applied to other imaging methods. Figures 17A to 17C are schematic diagrams of frame images of the knee joint taken from the axial direction. Figure 17A is an example of a reference position image. Figure 17B is an example where the knee flexion angle is small and it is not a reference position image. Figure 17C is an example where the knee flexion angle is large and it is not a reference position image.

[0147] When diagnosing the function of the knee joint, the imaging control unit 11 sets, for example, the "knee joint" as the target area and the "axial position" as the imaging direction, based on the examination order information. The imaging control unit 11 then sets "extension and flexion" as the movement and sets "the patellofemoral joint is symmetrical on both sides and the fibula is not visible" as the reference position and judgment condition. The imaging control unit 11 sets "patella, patellar surface of the femur, and fibula" as the targets for recognition.

[0148] In the Laurin imaging method, as shown in Figure 16, the patient is asked to sit with their knee flexed. Then, as shown in Figure 16, the radiation detection unit 14 is positioned on the femoral side, and radiation is incident on the patella in the caudal direction, which is the imaging direction.

[0149] Subsequently, the radiographic imaging device 10 has the patient extend and flex their knee joint, and performs dynamic imaging of the knee joint from the axial position during extension and flexion, acquiring dynamic images. At this time, the imaging control unit 11 (specification unit 115) determines, frame by frame, whether the acquired radiographic image shows that "the patellar-femoral joints are symmetrical on both sides and the fibula is not visible."

[0150] The specific unit 115, for example as shown in Figures 17B and 17C, recognizes the patella, the patellar surface of the femur, and the fibula in the knee joint, and determines on a frame-by-frame basis whether the patellofemoral joint is symmetrical and whether the fibula is not visible.

[0151] Based on the results of the above determination, the identification unit 115 determines whether or not the patellofemoral joint is symmetrical on both sides and the fibula is not visible. If the identification unit 115 determines that the patellofemoral joint is symmetrical on both sides and the fibula is not visible, it identifies the radiographic image of the frame being determined as the reference position image.

[0152] For example, the knee joint shown in the schematic diagram of Figure 17A is one in which the patellar-femoral joint is approximately symmetrical on both sides, and the fibula is not visible. In this case, it can be determined that the knee is in a state where "the patellar-femoral joint is symmetrical on both sides and the fibula is not visible," and in this case, the radiographic image of the frame being determined is identified as the reference position image.

[0153] On the other hand, in the schematic diagram of the knee joint shown in Figure 17B, the patellofemoral joint is approximately symmetrical, but because the knee flexion angle is small, the fibula is visible below the patellar surface. In this case, it is not determined that the "patellofemoral joint is symmetrical and the fibula is not visible."

[0154] Furthermore, in the schematic diagram of the knee joint shown in Figure 17C, the patellar femoral joint is approximately symmetrical, but the fibula is visible above the patellar surface due to the large knee flexion angle. In this case as well, it is not determined that the knee joint is "symmetrical and the fibula is not visible."

[0155] Here, the specific unit 115 determines, on a frame-by-frame basis, whether the patellofemoral joints are symmetrical and whether the fibula is not visible. Based on these determinations, the notification unit 116 notifies the user, through sound and information display, that the patellofemoral joints are symmetrical and the fibula is not visible.

[0156] As described above, the radiographic imaging device 10 can determine whether the patellar-femoral joint is symmetrical and the fibula is not visible during imaging of the knee joint axial position. If the radiographic imaging device 10 determines that the patellar-femoral joint is symmetrical and the fibula is not visible, it can identify a reference position image. As a result, the burden on the operator during radiographic imaging can be reduced.

[0157] The reference position images of the knee joint axis obtained in the manner described above are useful for diagnosing conditions such as osteoarthritis of the knee, recurrent patellar dislocation, patellar fracture, and loose bodies in the joint.

[0158] [summary] As described above, the radiographic imaging device 10 comprises an imaging unit, a identification unit 115, and a notification unit 116. The imaging unit captures radiographic images of the target area T of the subject in frame units during a predetermined operation. The identification unit 115 determines, frame by frame, whether the skeleton of the target area T is in a reference position in the captured radiographic images. The identification unit 115 then identifies the radiographic image in which the skeleton of the target area T is in the reference position as the reference position image. The notification unit 116 provides notification based on whether or not the reference position image has been identified.

[0159] The radiographic imaging device 10 notifies whether or not a reference position image has been identified during imaging, so the operator can understand whether or not a radiographic image (reference position image) has been taken at the reference position. As a result, the burden on operators such as radiographers can be reduced during imaging, and the imaging time can also be shortened.

[0160] Furthermore, since the radiation imaging device 10 will provide notification at the reference position, the reproducibility of capturing the reference position image will be improved when taking images again.

[0161] Furthermore, the radiographic imaging device 10 having the above configuration can reliably capture reference position images, and as a result, doctors and other medical professionals can make more accurate diagnoses based on the reference position images.

[0162] Furthermore, since a reference position image can be reliably captured, there is no need for re-shooting, which reduces the burden on the patient and also reduces radiation exposure.

[0163] The embodiments described above are merely examples of how the present invention can be implemented, and the technical scope of the present invention should not be interpreted as being limited by these embodiments. In other words, the present invention can be implemented in various forms without departing from its gist or its main features.

[0164] The radiography imaging device 10 and the radiography control device 20 may be mounted on a mobile cart, for example, to form a mobile medical unit. In that case, the radiography imaging device 10 and the radiography control device 20 should be configured to communicate wirelessly with the radiography image analysis device 30, the image management device 40, and the client terminal 50.

[0165] Furthermore, the reference position for the target area may be a predetermined reference position as shown in Figure 6, or it may be a reference position set during a previous imaging, or it may be set according to the disease or condition. In this case, the operator may input or specify the reference position using the control unit 17, etc., rather than being limited to imaging order information.

[0166] Furthermore, in the above embodiment, the reference position is determined and the reference position image is identified during shooting, but the reference position may be determined and the reference position image identified after shooting. In this case, in the above embodiment, the shooting control unit 11 of the radiation image acquisition device 10 has a identification unit 115 and a notification unit 116, but the control unit 21 of the radiation imaging control device 20 may have a identification unit 115 and a notification unit 116. [Explanation of Symbols]

[0167] 1. Radiation Image Processing System 10. Radiation imaging device 11. Image capture control unit 12 Radiation irradiation area 13 Shooting platform 14. Radiation detection unit 15 Display 16 Audio output section 17 Control section 20. Radiography control device 21 Control Unit 22 Memory section 23 Control section 24 Display 25 Communications Department 26 bus 30. Radiation Image Analysis Device 31 Control Unit 32 Storage section 33 Operation section 34 Display section 35 Communications Department 36 bus 40 Image management device 50 client terminals 60 Radiation Information Terminal 111 Configuration Information Acquisition Unit 112 Shooting Condition Determination Unit 113 Image generation unit 114 Storage section 115 Specific section 116 Hochi Department 311 Image acquisition unit 312 Analysis Department

Claims

1. An imaging unit that captures radiographic images of a target area of ​​a subject during a predetermined operation, frame by frame, During imaging, the system includes a determination unit that determines, on a frame-by-frame basis, whether the skeleton of the target part is in the reference position in the captured radiographic image, and identifies the radiographic image in which the skeleton of the target part is in the reference position as the reference position image, A notification unit that provides notification based on whether or not the aforementioned reference position image has been identified, Equipped with, Radiation imaging device.

2. The identification unit includes an image analysis unit that performs image analysis of the radiation image on a frame-by-frame basis, and identifies the reference position image based on the analysis results of the image analysis. The radiation imaging apparatus according to claim 1.

3. The notification unit provides notification by outputting sound when the skeleton of the target part is in the reference position during the predetermined operation. The radiation imaging apparatus according to claim 1.

4. The notification unit increases the volume of the sound as the skeleton of the target part approaches the reference position during the predetermined operation. The radiation imaging apparatus according to claim 3.

5. It further comprises a display unit having a display screen, During the predetermined operation, when the skeleton of the target part is in the reference position, the notification unit displays information on the display screen indicating that the skeleton of the target part has reached the reference position. The radiation imaging apparatus according to claim 1.

6. In a radiographic imaging device, Radiographic images of the target area of ​​the subject during a predetermined operation are captured frame by frame. During imaging, the system determines, on a frame-by-frame basis, whether the skeleton of the target area is in the reference position in the captured radiographic image, and identifies the radiographic image in which the skeleton of the target area is in the reference position as the reference position image. Notification is given based on whether or not the aforementioned reference position image has been identified. A method for supporting radiographic image acquisition.

7. In the computer of the radiographic imaging device, A process for capturing radiographic images of the target area of ​​the subject on a frame-by-frame basis during a predetermined operation, During imaging, the process involves determining, on a frame-by-frame basis, whether the skeleton of the target part is in the reference position in the captured radiographic image, and identifying the radiographic image in which the skeleton of the target part is in the reference position as the reference position image. A process to provide notification based on whether or not the aforementioned reference position image has been identified, To execute A program to support radiographic imaging.

Images