Dynamic quality management device, computer-readable storage medium, and dynamic quality management method

Abstract

The present invention can appropriately manage the quality of smoothness of moving images. A control unit of a console acquires moving image data comprising multiple frames of image data obtained through motion capture, and generates quality management information related to the smoothness of the moving image based on the movement distance of a predetermined object of the subject within the acquired moving image data. The generated quality management information related to the smoothness of the moving image is then output.

Description

Technical Field

[0001] The present invention relates to a dynamic quality management device, a dynamic quality management program and a dynamic quality management method. Background Art

[0002] Conventionally, in radiographic imaging of still images, various techniques have been proposed for performing QA (quality assurance) and QC (quality control) related to imaging.

[0003] For example, Patent Document 1 describes a method of performing QC operations on QC image data to obtain quality evaluation results. For example, evaluation items such as display dimensional accuracy, line formation, and clarity are evaluated, and whether each evaluation item is qualified or unqualified is determined based on whether the evaluation result of each evaluation item exceeds a threshold value. The QC image data is obtained by radiographically photographing a QC phantom P.

[0004] In recent years, various devices for performing dynamic imaging, which sequentially irradiates radiation to generate dynamic image data composed of multiple frames of image data, have been commercialized. Similar to still image capture, dynamic imaging requires a certain level of quality to prevent misdiagnosis by physicians, increased burden on technicians due to re-shooting, and increased radiation exposure to patients due to re-shooting.

[0005] For example, Patent Document 2 describes that it is preferable to set the frame rate during dynamic shooting to 3.75 frames per second or higher.

[0006] Patent Document 3 states that an imaging device allows irradiation when the corresponding imaging frame rate includes a value that is N times the irradiation frame rate (e.g., 15, 10, or 5) that the generating device can handle. Furthermore, it states that the irradiation frame rate is preferably set to a desired value based on the imaging technique. For example, to capture slowly changing motions such as breathing, an irradiation frame rate of at least 2 Hz is preferably used.

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 2008-283531

[0008] Patent Document 2: Japanese Patent Application Laid-Open No. 2012-110399

[0009] Patent Document 3: Japanese Patent Application Laid-Open No. 2020-54689

[0010] However, motion picture recording is a relatively new technology in the medical field. While there are references to this technology in patent documents 2 and 3, there has been little research and development into quality management related to motion picture recording. Consequently, for example, regular quality control after product delivery is often performed manually and in person by technicians. However, motion picture recording, compared to still image recording, provides a wider range of information related to quality management, leading to a desire to improve operational efficiency.

[0011] Furthermore, since motion pictures provide more information than still images and can be easily examined, they are sometimes used as a screening test as a gateway to a medical examination. Therefore, they are being used not only in university hospitals but also in clinics that lack radiographers (experts in imaging and interpreting images). However, if there are no specialists or if there are less experienced specialists, there is a risk of misdiagnosis if the quality of motion pictures is insufficient (for example, missing data for some frames or not captured at an appropriate frame rate, resulting in missing data representing some of the motion in the moving image) and the images are used directly for diagnosis.

[0012] As mentioned above, motion capture has been commercialized in recent years and is expected to become popular not only in Japan but also worldwide. In fact, it is also being commercialized outside of Japan. In this case, compared to still image capture, motion capture requires synchronization between the generator and the camera (panel) for tens of seconds to capture video. During motion capture, there are cases where data loss occurs between the generator and the camera (partial frame image data is missing), data transmission loss from the camera to the console (partial frame image data is missing), and the movement of the subject's structures (e.g., the diaphragm, blood vessels, bones, joints, and other moving parts) in the motion image data appears blurred (not smooth), causing inconsistencies. Thus, even if the quality of the frame image data meets the benchmark, the quality of the motion capture will be reduced due to the omission of frame image data.

[0013] Furthermore, if the motion of the subject's structure is captured dynamically with an insufficient frame rate, the motion of the subject's structure in the dynamic image data obtained through dynamic capture may appear blurry or inconsistent. Furthermore, even if such dynamic image data is analyzed, sufficient quality analysis results cannot be obtained. Summary of the Invention

[0014] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to appropriately perform quality management of the smoothness of moving images.

[0015] To solve the above-mentioned problems, the present invention provides a dynamic quality management device for performing quality management related to dynamic imaging of a subject by sequentially irradiating the subject with radiation, and includes:

[0016] an acquisition unit, which acquires dynamic image data including a plurality of frame image data obtained by the dynamic shooting;

[0017] a generating unit that generates quality management information related to smoothness of a moving image based on a movement distance of a predetermined object of the subject within the moving image data; and

[0018] The output unit outputs quality management information related to the smoothness of the moving image.

[0019] Furthermore, the dynamic quality management program of the present invention is characterized in that it is a dynamic quality management program for performing quality management related to dynamic imaging of a subject by sequentially irradiating the subject with radiation to thereby capture the subject's dynamic state.

[0020] Make the computer execute the following processing:

[0021] The first process is to obtain dynamic image data including a plurality of frame image data obtained by the dynamic shooting;

[0022] A second process of generating quality management information related to the smoothness of the moving image based on a movement distance of a predetermined object of the subject within the moving image data; and

[0023] The third process is to output quality management information related to the smoothness of the moving image.

[0024] Furthermore, the dynamic quality management method of the present invention is characterized in that it is a dynamic quality management method for performing quality management related to dynamic imaging of a subject by sequentially irradiating the subject with radiation, and comprises:

[0025] The first step is to obtain dynamic image data including a plurality of frame image data obtained by the dynamic shooting;

[0026] A second step is to generate quality management information related to the smoothness of the moving image based on the movement distance of the predetermined object of the subject in the moving image data; and

[0027] The third step is to output quality management information related to the smoothness of the moving image.

[0028] According to the present invention, it is possible to appropriately perform quality management of the smoothness of moving images. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a block diagram showing an example of a radiographic system according to an embodiment of the present invention.

[0030] Figure 2 Yes Figure 1 A block diagram of the functional structure of the console.

[0031] Figure 3 In the first embodiment, Figure 2 Flowchart of the process of quality management information generation processing A executed by the control unit.

[0032] Figure 4 This is a diagram showing an example of a phantom.

[0033] Figure 5 In the second embodiment, Figure 2 Flowchart of the process of quality management information generation processing B executed by the control unit.

[0034] Description of Reference Numerals

[0035] 100…Radiation imaging system; 1…Radiation image imaging device; 2…Console (dynamic quality management device); 21…Control unit; 22…Storage unit; 23…Communication unit; 24…Display unit; 25…Operation unit; 3…Radiation generating device; 31…Generator; 32…Irradiation indication switch; 33…Radiation source; 4…Dynamic analysis device; 5…Image management device; N…Communication network; R…Radiation; S…Subject. DETAILED DESCRIPTION

[0036] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, the technical scope of the present invention is not limited to the following embodiments and illustrations.

[0037] [First embodiment]

[0038] <1.Radiographic imaging system>

[0039] First, a schematic configuration of a radiation imaging system (hereinafter, referred to as a system 100 ) according to a first embodiment of the present invention will be described.

[0040] A radiographic imaging system is capable of performing dynamic imaging by sequentially irradiating a subject with radiation to capture its movements. Dynamic imaging produces multiple images depicting the subject's movements. The series of images obtained through dynamic imaging is referred to as a dynamic image. Furthermore, each of the multiple images that comprise a dynamic image is referred to as a frame image.

[0041] Here, "dynamic shooting" includes video shooting, but does not include the case where a video is displayed while a still image is captured. "Dynamic image" includes video, but does not include an image obtained by displaying a video while a still image is captured.

[0042] Figure 1 is a block diagram showing the system 100 .

[0043] like Figure 1 As shown, the system 100 includes a radiation imaging device (hereinafter, imaging device 1 ), a console 2 , a radiation generating device (hereinafter, generating device 3 ), a motion analysis device 4 , and an image management device 5 .

[0044] The devices 1 to 5 can communicate with each other via a communication network N (LAN (Local Area Network), WAN (Wide Area Network), the Internet, etc.), for example.

[0045] Furthermore, the system 100 may be installed in an imaging room or configured to be movable (eg, a mobile medical vehicle).

[0046] Furthermore, the system 100 can also communicate with a hospital information system (HIS), a radiology information system (RIS), and the like (not shown).

[0047] [1-1. Radiation Generator]

[0048] The generating device 3 includes a generator 31 , an irradiation instruction switch 32 , and a radiation source 33 .

[0049] The generator 31 applies a voltage according to preset imaging conditions to the radiation source 33 (electron tube) based on the operation of the irradiation instruction switch 32 .

[0050] When a voltage is applied to the radiation source 33 from the generator 31 , the radiation source 33 generates radiation R (eg, X-rays) at a dose corresponding to the applied voltage.

[0051] Furthermore, the generator 3 of the present embodiment generates radiation R in a format corresponding to the format of the radiation image to be generated (still image, moving image).

[0052] In the case of a still image, each time the irradiation instruction switch 32 is pressed, irradiation of radiation R is performed only once.

[0053] In the case of a moving image, each time the irradiation instruction switch 32 is pressed, irradiation of the radiation R in pulse form is repeated a plurality of times (for example, 15 times per second) every predetermined time, or irradiation of the radiation R is continued for a predetermined time.

[0054] That is, the "sequential irradiation with radiation" in the present invention includes continuous irradiation in which radiation is continuously irradiated, and pulse irradiation in which radiation is irradiated intermittently or not irradiated.

[0055] [1-2. Radiographic imaging device]

[0056] The imaging device 1 generates digital data of a radiographic image obtained by imaging an imaging portion of a subject.

[0057] The imaging device 1 of this embodiment is a portable FPD (Flat Panel Detector).

[0058] Specifically, although the imaging device 1 of the present embodiment is omitted from the illustration, it includes a sensor substrate in which imaging elements that generate charges corresponding to the dose by receiving radiation R and switching elements that accumulate / release the charges are arranged in a two-dimensional (matrix) shape, a scanning unit that switches each switching element on / off, a readout unit that reads the amount of charge released from each pixel as a signal value, a control unit that controls each unit and generates a radiation image based on multiple signal values ​​read by the readout unit, and a communication unit that sends the data of the generated radiation image, various signals, etc. to other devices (console 2, generator 3, image management device 5, etc.) or receives various information and various signals from other devices.

[0059] Furthermore, the imaging device 1 generates image data of a still image (hereinafter referred to as still image data) or image data of a moving image (hereinafter referred to as moving image data) by accumulating / releasing electric charge and reading signal values ​​in synchronization with the timing of irradiating radiation R from the generating device 3 .

[0060] When generating still image data, each time the irradiation instruction switch 32 is pressed once, a radiation image is generated only once.

[0061] When generating moving image data, each time the irradiation instruction switch 32 is pressed, generation of frame image data constituting the moving image data is repeated a plurality of times (for example, 15 times per second) every predetermined time.

[0062] The imaging device 1 transmits image data generated by imaging to the console 2 .

[0063] In addition, the photographing device 1 may be integrated with the generating device 3 .

[0064] [1-3. Console]

[0065] The console 2 is composed of a PC, a dedicated device, etc., and is an imaging control device that controls imaging by the imaging device 1 and the generating device 3 .

[0066] The console 2 sets various imaging conditions (tube voltage, tube current, irradiation time (mAs), imaging site, imaging direction, frame rate, etc.) for at least one of the imaging device 1 and the generating device 3. The console 2 sets imaging conditions based on test order information obtained from other systems (such as HIS and RIS) or operations performed by a user (such as a technician). Test order information includes, for example, patient information (patient ID, patient name, gender, age, and presence of disease), imaging type (moving / still image), imaging site, imaging direction, medical department, and analysis type.

[0067] In addition, in this embodiment, the console 2 has a function as the dynamic quality management device of the present invention.

[0068] The details of the console 2 will be described later.

[0069] [1-4. Dynamic Analysis Device]

[0070] The dynamic analysis device 4 analyzes the dynamic image data sent from the console 2 and sends the analysis results to the image management device 5. The dynamic analysis device 4 can analyze ventilation, blood flow, the amount of movement of a predetermined structure, and the like, for example.

[0071] [1-5. Image Management Device]

[0072] The image management device 5 manages the image data generated by the imaging device 1 and the analysis results generated by the motion analysis device 4 .

[0073] Examples of the image management device 5 include a picture archiving and communication system (hereinafter referred to as PACS), an image diagnosis workstation (hereinafter referred to as IWS), and the like.

[0074] <2. Details of the control panel>

[0075] Next, the console 2 will be described in detail.

[0076] [2-1. Console Structure]

[0077] Figure 2 2 is a block diagram showing the functional structure of the console 2 .

[0078] like Figure 2As shown, the console 2 includes a control unit 21 , a storage unit 22 , a communication unit 23 , a display unit 24 , and an operation unit 25 . The units 21 to 25 are electrically connected via a bus or the like.

[0079] The control unit 21 is composed of a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like.

[0080] The ROM stores various programs executed by the CPU, parameters necessary for executing the programs, and the like.

[0081] The CPU reads various programs stored in the ROM and expands them in the RAM. Based on the expanded programs, the CPU executes various processes represented by the quality management information generation process A described below, and centrally controls the operations of various components of the console 2.

[0082] The control unit 21 functions as a generating unit and an output unit by executing a quality management information generating process A described later.

[0083] The storage unit 22 is composed of a nonvolatile memory, a hard disk, and the like, and stores various data.

[0084] For example, the storage unit 22 stores inspection order information transmitted from a RIS or the like.

[0085] The communication unit 23 is composed of a communication module and the like.

[0086] The communication unit 23 transmits and receives various signals and data to and from other devices (such as the imaging device 1 , the generating device 3 , the motion analyzing device 4 , and the image management device 5 ) connected by wire or wirelessly via the communication network N. The communication unit 23 functions as an acquisition unit.

[0087] The display unit 24 is composed of, for example, an LCD (Liquid Crystal Display), a CRT (Cathode Ray Tube), etc. The display unit 24 displays a radiographic image or the like in accordance with an image signal received from the control unit 21 .

[0088] The operation unit 25 includes a keyboard (cursor keys, numeric 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 outputs a control signal corresponding to the user's operation to the control unit 21.

[0089] The console 2 may not include the display unit 24 and the operation unit 25 , and may receive control signals from an input device provided separately from the console 2 via the communication unit 23 or the like, or output image signals to a display device (monitor) provided separately from the console 2 .

[0090] In addition, when other devices (such as the image management device 5) have a display unit and an operation unit, control signals can be received from the operation unit of the other device, or image signals can be output to the display unit of the other device (the display unit and operation unit can be shared with other devices).

[0091] [2-2. Operation of the console]

[0092] Next, the operation of the console 2 will be described.

[0093] Figure 3 This is a flowchart showing the flow of the quality management information generation process A executed in the console 2. The quality management information generation process A is to generate a phantom F (see Figure 4 ) as the subject S, and based on the obtained moving image data, generates and outputs quality management information (described in detail later) related to the smoothness of the moving image. The quality management information generation process A is performed, for example, when the imaging device 1 and the generating device 3 are shipped from the factory, when they are installed in a medical facility, or when the quality of the moving images is confirmed before the start of medical treatment at the medical facility. The process is executed by the CPU of the control unit 21 in cooperation with the program stored in the ROM in response to an operation of the user's operation unit 25 instructing the execution of the quality management information generation process A.

[0094] In the quality management information generation process A, the control unit 21 first allows the user to select a structure for which moving image quality management information is to be generated (step S1 ).

[0095] For example, the control unit 21 displays a list of structures on the display unit 24 and allows selection via the operation unit 25 .

[0096] Next, the control unit 21 sets the shooting conditions for dynamic shooting in the shooting device 1 and the generating device 3 (step S2).

[0097] For example, the control unit 21 automatically sets the shooting conditions corresponding to the structure selected in step S1. Alternatively, the shooting conditions can be set by the user's operation of the operating unit 25. The shooting conditions include radiation irradiation conditions and image reading conditions. As image reading conditions, for example, pixel size, image size, and frame rate can be cited. As radiation irradiation conditions, for example, the tube voltage (kV), tube current (mA), irradiation time (ms), frame rate, etc. of the radiation source can be cited. In addition, the radiation irradiation conditions can also be set directly by the user from the operating panel of the generator 3.

[0098] Here, the user places the phantom F between the radiation source 33 of the generator 3 and the imaging device 1 to perform positioning.

[0099] As the phantom F, for example, Figure 4 As shown, a jig having a radiation (X-ray) absorbing portion F1 is used, which moves at approximately the same speed (mm / s or cm / s) as the structure selected in step S1 and has approximately the same distance. For example, when performing quality control of dynamic images of the diaphragm, the user places a phantom F configured to move at approximately the same speed and distance as the diaphragm between the radiation source 33 and the imaging device 1 and operates the phantom. When performing quality control of dynamic images of the cardiovascular system, the user places a phantom F configured to move at approximately the same speed and distance as the cardiovascular system and operates the phantom.

[0100] Then, when the user operates the irradiation instruction switch 32 , dynamic imaging starts.

[0101] That is, the generator 3 irradiates the phantom F serving as the subject S with the radiation R.

[0102] The imaging device 1 captures the motion of the phantom F at a timing when receiving radiation R from the radiation generator 3 , generates motion image data consisting of a plurality of frame image data, and transmits the motion image data to the console 2 .

[0103] When the dynamic image data obtained by dynamically photographing the phantom F is received (acquired) by the communication unit 23 (step S3 ), the control unit 21 generates quality management information related to the smoothness of the dynamic image based on the acquired dynamic image data (step S4 ).

[0104] The quality management information related to the smoothness of the moving image refers to information related to the smoothness of the motion of a predetermined object in the moving image data. In this embodiment, the predetermined object is the radiation absorbing portion F1 of the phantom F that moves in accordance with the structure selected in step S1 (moving at approximately the same speed and distance as the diagnostic object).

[0105] For example, the smaller the moving distance (amount of movement) of a structure between adjacent frame image data in dynamic image data, the smoother the movement of the structure in the dynamic image data, resulting in an image that can be evaluated as having high smoothness. However, if one wants to improve smoothness and excessively reduces the moving distance of the structure between adjacent frame image data, then when the irradiation dose during the shooting of each frame image of dynamic shooting is set to a constant, the exposure dose of the subject increases excessively, so it is not preferred. When the total irradiation dose in dynamic shooting is set to a constant, the noise in each frame image data increases, affecting the diagnosis and analysis results. In addition, there are also problems such as the increase in the amount of useless dynamic image data, which takes extra time in analysis processing and transmission, and the pressure on memory capacity due to the redundant data.

[0106] On the other hand, if the distance between adjacent frames of moving image data is too large, the smoothness of the moving objects in the moving image data is lost, resulting in a blurry, unnatural, and less smooth image. Even if dynamic analysis is performed, information is lost, and accurate analysis results cannot be obtained.

[0107] Therefore, in this embodiment, the control unit 21 identifies the region of a predetermined object, i.e., the region of the radiation absorption site F1 of the phantom F that is moving in accordance with the structure selected in step S1, from each frame of the dynamic image data. The control unit 21 then generates quality management information related to the smoothness of the dynamic image based on the movement distance d of the predetermined object within the captured dynamic image data, for example, the movement distance d of the predetermined object between predetermined frames of the captured dynamic image data. The predetermined frame of image data preferably includes two adjacent (contiguous) frames of image data. This allows for more accurate smoothness evaluation than when non-adjacent frames of image data are used as the target. However, non-adjacent frames of image data may also be used. Alternatively, the movement distance d may be calculated based on a single frame of image data within the dynamic image data. In dynamic image data, signals from a structure in the preceding frame of image data (referred to as the previous frame of image data) may appear as noise components within a frame of image data (afterimage). The length of this noise component (the distance between the signal of the predetermined object in the frame image data and the signal of the predetermined object appearing in the previous frame image data) is related to the movement distance d of the predetermined object. Therefore, the movement distance d can also be calculated based on the length of this noise component.

[0108] Quality management information related to the smoothness of moving images includes at least one value including index values ​​related to the smoothness of moving image data (moving distance d, moving distance d / frame rate f, moving speed, acceleration, etc.) and information on whether the index value is within an appropriate range.

[0109] For example, the movement distance d of a predetermined object between adjacent frames of moving image data is calculated and generated as quality management information related to the smoothness of the moving image. Alternatively, information indicating whether the movement distance d falls within the appropriate range A<d<B is generated as quality management information related to the smoothness of the moving image. Here, A and B are constants predetermined for each predetermined object in the moving image data and are values ​​obtained through experimentation.

[0110] For example, when the predetermined object is the radiation absorbing site F1 of the phantom F that moves in accordance with the diaphragm, A=3 cm and B=10 cm.

[0111] For example, when the predetermined object is the radiation absorbing site F1 of the phantom F that moves in accordance with the cardiovascular system, A=1 cm and B=5 cm.

[0112] For example, when the predetermined object is the radiation absorbing site F1 of the phantom F that moves according to the knee joint, A=5 cm and B=15 cm.

[0113] Furthermore, the moving distance d can be calculated for each adjacent frame image data, or can be used as a representative value (average value, maximum value, minimum value, median value, etc.) of the moving distances calculated for each adjacent frame image data. If the moving distance d is calculated for each adjacent frame image data, for example, when there is a missing frame image data, the user can easily identify it.

[0114] Alternatively, for example, the distance d that a predetermined object moves per second in the moving image data (i.e., if the frame rate during moving image capture is f, the distance d moved between the f frames of image data preceding it) can be calculated and d / f generated as quality management information related to the smoothness of the moving image. For example, since the value d / f, obtained by dividing the distance d moved per second by the frame rate f, indicates that an image is captured for each movement of the predetermined object, it can be used as quality management information related to the smoothness of the moving image.

[0115] Alternatively, information indicating whether the movement distance d / f is within the appropriate range A' < d / f < B' may be generated as quality management information related to the smoothness of the moving image. Here, A' and B' are constants predetermined for each predetermined object in the moving image data and are values ​​obtained through experimentation.

[0116] For example, when the predetermined object is the radiation absorbing site F1 of the phantom F that moves in accordance with the chest, A′=2 and B′=4.

[0117] For example, when the predetermined object is the radiation absorbing site F1 of the phantom F that moves in accordance with the moving device, A′=0.5 and B′=1.

[0118] Here, the frame rate f used for calculating d / f can be a frame rate set as the shooting conditions or a frame rate calculated based on the moving image data. If the frame rate is calculated based on the moving image data, if some frame image data is missing due to malfunctioning equipment, for example, this can reflect quality management information related to the smoothness of the moving image. For example, a method for calculating the frame rate based on the moving image data can be to calculate the time interval (difference in generation time) from the previous or next frame image data for multiple (preferably all) frames of the moving image data, and use the reciprocal of the calculated value as the frame rate.

[0119] Furthermore, the control unit 21 may calculate the moving speed and acceleration of the predetermined object based on the calculated moving distance d, and use these as information for quality management related to the smoothness of the moving image. Furthermore, the control unit 21 may generate information indicating whether the moving speed and acceleration are within an appropriate range, and use these as information for quality management related to the smoothness of the moving image.

[0120] When the generation of the quality management information related to the smoothness of the moving image is completed, the control unit 21 outputs the generated quality management information related to the smoothness of the moving image (step S5 ), and ends the quality management information generation process A.

[0121] In step S5, the control unit 21 displays at least one of the calculated moving distance d, d / f, moving speed, and moving acceleration as quality management information related to the smoothness of the moving image on the display unit 24. The moving image data acquired in step S3 may also be displayed.

[0122] Factory shipping inspection personnel and camera engineers understand the approximate appropriate ranges for the aforementioned movement distance d, d / f, etc. Therefore, by outputting this information as quality management information related to the smoothness of moving images, factory shipping inspection personnel and camera engineers can confirm whether the smoothness of moving images is appropriate and appropriately perform quality management of the smoothness of moving images.

[0123] Furthermore, for example, the control unit 21 may display the calculated movement distance d and information indicating whether d / f is within an appropriate range on the display unit 24 as information for quality management related to the smoothness of the moving image. This allows even unskilled personnel such as those responsible for factory shipment inspections or photography technicians to confirm whether the smoothness of the moving image is appropriate and appropriately perform quality management of the smoothness of the moving image.

[0124] [Second embodiment]

[0125] Next, a second embodiment of the present invention will be described.

[0126] In the first embodiment, a case is described in which quality management information related to the smoothness of a dynamic image is generated and output based on dynamic image data obtained by dynamically photographing a phantom F, but in the second embodiment, a case is described in which quality management information related to the smoothness of a dynamic image is generated and output based on dynamic image data obtained by dynamically photographing a subject during an actual examination.

[0127] Since the configuration of the system and the device in the second embodiment is the same as that described in the first embodiment, the description thereof will be cited. Hereinafter, the operation of the console 2 in the second embodiment will be described.

[0128] In the second embodiment, the console 2 executes Figure 5 The quality management information generation process B is shown. The quality management information generation process B is executed by the CPU of the control unit 21 in cooperation with the program stored in the ROM when, for example, dynamic imaging inspection order information is selected from the inspection list screen displayed on the display unit 24 via the operation unit 25 .

[0129] First, the control unit 21 sets the shooting conditions for dynamic shooting in the imaging device 1 and the generating device 3 (step S21 ).

[0130] For example, the control unit 21 automatically sets the shooting conditions (image reading conditions. For example, pixel size, image size, frame rate, etc.) for the shooting device 1 based on the shooting part, shooting direction, diagnosis and treatment department, etc. contained in the examination order information, and sets the shooting conditions (radiation irradiation conditions. For example, the tube voltage (kV), tube current (mA), irradiation time (ms), frame rate, etc. of the radiation source) for the generating device 3. Alternatively, the image reading conditions for the shooting to be performed can be set for the shooting device 1 according to the operation of the user's operating unit 25. In addition, the radiation irradiation conditions can also be set by the user from the operating panel of the generating device 3.

[0131] Here, the user places the subject S (the person being examined) between the radiation source 33 of the generator 3 and the imaging device 1 to perform positioning.

[0132] Then, when the user operates the irradiation instruction switch 32 , dynamic imaging starts.

[0133] That is, the generator 3 irradiates the imaging part of the subject S with the radiation R.

[0134] The imaging device 1 captures the motion of the subject S at the timing of receiving the radiation R from the radiation generator 3 , generates motion image data composed of a plurality of frame image data, and transmits the motion image data to the console 2 .

[0135] When the communication unit 23 receives (acquires) the moving image data of the person being measured as the subject S (step S22 ), the control unit 21 generates quality management information related to the smoothness of the moving image based on the acquired moving image data (step S23 ).

[0136] As described in the first embodiment, the so-called quality management information related to the smoothness of the dynamic image is information related to the smoothness of the movement of the specified object in the dynamic image data. In the second embodiment, the so-called specified object refers to the structure of the subject (subject S). The structure can be determined based on the examination order information, for example. For example, the correspondence between the shooting part (for example, chest, neck, knee joint, elbow joint, ...) and the diagnosis and treatment department (respiratory department, circulatory department, plastic surgery, ...) and the structure can be stored in the storage unit 22, and the structure can be determined based on the shooting part and the diagnosis and treatment department of the examination order information.

[0137] The processing of step S23 is the same as that in step S24 except that the predetermined object identified from the dynamic image data is the structure of the subject. Figure 3 The structure is the same as that described in step S4, so the description is referenced.

[0138] Furthermore, when the predetermined object is the diaphragm, the constants A and B within the appropriate range A<d<B are, for example, A = 3 cm and B = 10 cm. For example, when the predetermined object is a cardiovascular system, A = 1 cm and B = 5 cm. For example, when the predetermined object is a knee joint, A = 5 cm and B = 15 cm.

[0139] When the predetermined object is a chest, the constants A' and B' in the appropriate range A'<d / f<B' are, for example, A' = 2 and B' = 4. For example, when the predetermined object is an exerciser, A' = 0.5 and B' = 1.

[0140] When the generation of the quality management information related to the smoothness of the moving image is completed, the control unit 21 outputs the generated quality management information related to the smoothness of the moving image (step S24 ).

[0141] The processing of step S24 is the same as Figure 3 Similar to step S5, the captured moving image data may be displayed on the display unit 24 together with the quality management information related to the smoothness of the moving image. In this way, the user (photography engineer) can confirm whether the smoothness of the moving image is appropriate by viewing the quality management information related to the smoothness of the moving image and the captured moving image data.

[0142] The user refers to the displayed quality management information and moving images related to smoothness to determine whether an image suitable for diagnosis has been acquired (shooting OK) or needs to be retaken (shooting NG). Then, the user operates the operation unit 25 to input the determination result.

[0143] If the judgment result indicating that the shooting is OK is inputted through the prescribed operation of the operation unit 25 (step S25; yes), the control unit 21 attaches an identification ID for identifying the dynamic image data, patient information, examination information (shooting site, shooting direction, radiation exposure conditions, image reading conditions, number indicating the shooting order (frame number), diagnosis and treatment department, type of analysis, etc.) to each frame of the series of frame image data acquired by dynamic shooting (for example, written in the header area of ​​the image data in DICOM format), and sends it to the dynamic analysis device 4 via the communication unit 23 (step S26). In addition, if the type of analysis is not specified, the dynamic image data can also be sent to the image management device 5. Then, the quality management information generation process B is terminated.

[0144] On the other hand, if the predetermined operation input to the operating unit 25 indicates a determination result of NG (step S25: No), the control unit 21 deletes the series of frame image data stored in the storage unit 22 (step S27) and terminates the quality management information generation process B. In this case, reshooting is necessary. The photography engineer can perform reshooting by changing shooting conditions such as the frame rate, performing maintenance on the camera 1 and the generator 3, or using another camera 1 or generator 3. This allows for appropriate quality management of the smoothness of the moving image.

[0145] Furthermore, when generating information indicating whether an indicator value, such as the moving distance d or d / f, is within an appropriate range as quality management information related to the smoothness of a moving image, the control unit 21 may display a notification message such as "The smoothness of the moving image is inappropriate. Please retake the image." on the display unit 24 (or output it via voice) if the indicator value is not within the appropriate range, prompting the user to retake the image. Furthermore, when the indicator value is not within the appropriate range, the control unit 21 may control the display unit 24 to prevent input such as "shooting OK" from being made, thereby preventing the transmission of moving image data with inappropriate smoothness to the motion analyzer 4 or image management device 5 (preventing the transmission of moving image data with inappropriate smoothness to the motion analyzer 4 or image management device 5). This prevents moving image data with inappropriate smoothness from being provided for analysis and diagnosis.

[0146] Upon receiving the moving image data from the console 2 , the motion analysis device 4 performs analysis processing corresponding to the type of analysis associated with the moving image data and transmits the analysis result to the image management device 5 in association with the moving image data and its associated information.

[0147] The image management device 5 stores and manages the received moving image data and analysis results in association with the supplementary information.

[0148] Thus, in the second embodiment, since quality management information related to the smoothness of the dynamic image in the dynamic image data obtained by actually dynamically photographing the subject during the examination is generated and output, users such as photography technicians can appropriately perform quality management of the smoothness of the dynamic image.

[0149] Furthermore, the control unit 21 may acquire dynamic image data by performing a preliminary imaging before the actual imaging of the imaging portion of the subject during the examination, and generate quality management information related to the smoothness of the dynamic image based on the acquired dynamic image data.

[0150] [Modification]

[0151] In the second embodiment, the console 2 is described as having the function of the dynamic quality management device of the present invention, and generating and outputting quality management information related to the smoothness of the dynamic image based on the dynamic image data obtained by dynamic shooting. However, the dynamic analysis device 4 and the image management device 5 may also have the function of the dynamic quality management device of the present invention, and generate and output quality management information related to the smoothness of the dynamic image based on the received dynamic image data.

[0152] For example, the control unit of the motion analysis device 4 executes the same Figure 5If the generated quality management information related to the smoothness of the moving image indicates that the smoothness of the moving image is inappropriate, a notification message such as "The smoothness of the moving image is inappropriate and therefore cannot be used for analysis" is displayed (or a sound is output) in the same manner as in step S23. Alternatively, if the quality management information related to the smoothness of the moving image generated based on the moving image data indicates that the smoothness of the moving image is inappropriate, the control unit of the moving image analysis device 4 may control the moving image data not to be used for analysis. This prevents erroneous analysis results from being provided to the diagnosis.

[0153] In addition, for example, the control unit of the image management device 5 performs the same operation as that of the received dynamic image data. Figure 5 The same process as step S23 is performed, and the generated quality management information related to the smoothness of the moving image is stored in correspondence with the moving image data. Furthermore, when a request is made from the client to display the moving image data, a notification message such as "The requested moving image data has inappropriate smoothness and cannot be used for diagnosis" is displayed to the client (or a sound is output). Alternatively, if the quality management information related to the smoothness of the moving image generated based on the moving image data requested from the client indicates that the smoothness of the moving image is inappropriate, the control unit of the image management device 5 may control the client to not display the moving image data. This prevents moving image data with inappropriate smoothness from being provided for diagnosis.

[0154] While the first and second embodiments of the present invention and their modifications have been described above, the present invention is not limited to the above-described embodiments and can, of course, be modified as appropriate without departing from the spirit of the present invention.

[0155] For example, in the above embodiment, information related to quality management of the smoothness of moving images is output via the display unit 24 , but it may be output via a sound output device or output to an external device via the communication unit 23 .

[0156] Furthermore, for example, the above description discloses an example of using a hard disk, semiconductor nonvolatile memory, or the like as a computer-readable medium for the program of the present invention, but this is not limiting. Other computer-readable media may include portable recording media such as CD-ROMs. Furthermore, a carrier wave may be used as a medium for providing data of the program of the present invention via a communication line.

Claims

1. A dynamic quality management device for performing quality management related to dynamic photography, wherein the dynamic photography is performed by sequentially irradiating a subject with radiation to capture the subject's movements, characterized in that: Comprising: An acquisition unit that acquires dynamic image data including a plurality of frame image data obtained by the above-mentioned dynamic shooting; A generation unit that generates information for quality management related to the smoothness of a dynamic image based on the moving distance of a specified object of the object being photographed within the above-mentioned dynamic image data; And An output unit that outputs information for quality management related to the smoothness of the above-mentioned dynamic image.

2. The dynamic quality management device according to claim 1, wherein: The above-mentioned generation unit generates information for quality management related to the smoothness of a dynamic image based on the moving distance of a specified object of the object being photographed between specified frame image data within the above-mentioned dynamic image data.

3. The dynamic quality management device according to claim 1 or 2, wherein: The object being photographed is a phantom, The above-mentioned specified object is the X-ray absorption part of the above-mentioned phantom.

4. The dynamic quality management device according to claim 1 or 2, wherein: The object being photographed is a subject, The above-mentioned specified object is a structure of the above-mentioned subject.

5. The dynamic quality management device according to claim 4, wherein: The above-mentioned generation unit generates information for quality management related to the smoothness of the above-mentioned dynamic image based on dynamic image data obtained by pre-shooting before the actual shooting during the dynamic shooting of the above-mentioned subject.

6. The dynamic quality management device according to any one of claims 1 to 5, wherein: The above-mentioned generation unit generates information for quality management related to the smoothness of the above-mentioned dynamic image based on whether the above-mentioned moving distance is within a specified range.

7. The dynamic quality management device according to claim 6, wherein: When the above-mentioned moving distance is d and the above-mentioned specified range is A < d < B, the above-mentioned A and the above-mentioned B are constants determined according to the above-mentioned specified object.

8. The dynamic quality management device according to any one of claims 1 to 5, wherein: The above-mentioned generation unit generates information for quality management related to the smoothness of the above-mentioned dynamic image based on the above-mentioned moving distance and the value of the frame rate during the dynamic shooting of the above-mentioned object being photographed.

9. The dynamic quality management device according to claim 8, wherein: The above-mentioned generation unit generates information for quality management related to the smoothness of the above-mentioned dynamic image based on whether an evaluation value based on the above-mentioned moving distance and the above-mentioned frame rate value is within a second specified range.

10. The dynamic quality management device according to claim 9, wherein: When the above-mentioned moving distance is d, the above-mentioned frame rate is f, and the above-mentioned second specified range is A' < d / f < B', the above-mentioned A' and the above-mentioned B' are constants determined according to the above-mentioned specified object.

11. A computer-readable storage medium stores a dynamic quality management program, and the above-mentioned dynamic quality management program performs quality management related to dynamic shooting of photographing a subject by sequentially irradiating the subject with radiation, wherein: The above-mentioned dynamic quality management program causes a computer to execute the following processing: A first process of acquiring dynamic image data including a plurality of frame image data obtained by the above-mentioned dynamic shooting; A second process that generates quality management information related to the smoothness of the moving image based on the moving distance of a specified object of the subject within the above-described moving image data; and A third process that outputs quality management information related to the smoothness of the moving image.

12. The computer-readable storage medium according to claim 11, wherein the second process generates quality management information related to the smoothness of the moving image based on the moving distance of a specified object of the subject between specified frame image data within the moving image data.

13. The computer-readable storage medium according to claim 11 or 12, wherein the subject is a phantom, and the specified object is an X-ray absorption part of the phantom.

14. The computer-readable storage medium according to claim 11 or 12, wherein the subject is a subject to be examined, and the specified object is a structure of the subject to be examined.

15. The computer-readable storage medium according to claim 14, wherein the second process generates quality management information related to the smoothness of the moving image based on moving image data obtained by pre-shooting before the actual shooting during the dynamic shooting of the subject to be examined.

16. The computer-readable storage medium according to any one of claims 11 to 15, wherein the second process generates quality management information related to the smoothness of the moving image based on whether the moving distance is within a specified range.

17. The computer-readable storage medium according to claim 16, wherein when the moving distance is d and the specified range is A < d < B, A and B are constants determined according to the specified object.

18. The computer-readable storage medium according to any one of claims 11 to 15, wherein the second process generates quality management information related to the smoothness of the moving image based on the moving distance and the value of the frame rate during the dynamic shooting of the subject.

19. The computer-readable storage medium according to claim 18, wherein the second process generates quality management information related to the smoothness of the moving image based on whether an evaluation value based on the moving distance and the value of the frame rate is within a second specified range.

20. The computer-readable storage medium according to claim 19, wherein when the moving distance is d, the frame rate is f, and the second specified range is A' < d / f < B', A' and B' are constants determined according to the specified object.

21. A method for managing the quality of a dynamic image, wherein the method is for managing the quality of a dynamic image, wherein the dynamic image is captured by sequentially irradiating a subject with radiation. Comprising: A first step of obtaining moving image data including a plurality of frame image data obtained by the above-described dynamic shooting; A second step of generating quality management information related to the smoothness of the moving image based on the moving distance of a specified object of the subject within the moving image data; and The third process outputs information on quality management related to the smoothness of the above-mentioned moving image.

22. The dynamic quality management method according to claim 21, wherein the above-mentioned second process generates information on quality management related to the smoothness of the moving image based on the moving distance of a specified object of the subject within specified frame image data in the above-mentioned moving image data.

23. The dynamic quality management method according to claim 21 or 22, wherein the above-mentioned subject is a phantom, and the above-mentioned specified object is the X-ray absorption part of the above-mentioned phantom.

24. The dynamic quality management method according to claim 21 or 22, wherein the above-mentioned subject is a subject to be examined, and the above-mentioned specified object is a structure of the above-mentioned subject to be examined.

25. The dynamic quality management method according to claim 24, wherein the above-mentioned second process generates information on quality management related to the smoothness of the above-mentioned moving image based on the moving image data obtained by pre-shooting before the actual shooting in the dynamic shooting of the above-mentioned subject to be examined.

26. The dynamic quality management method according to any one of claims 21 to 25, wherein the above-mentioned second process generates information on quality management related to the smoothness of the above-mentioned moving image based on whether the above-mentioned moving distance is within a specified range.

27. The dynamic quality management method according to claim 26, wherein when the above-mentioned moving distance is d and the above-mentioned specified range is A < d < B, A and B are constants determined according to the above-mentioned specified object.

28. The dynamic quality management method according to any one of claims 21 to 25, wherein the above-mentioned second process generates information on quality management related to the smoothness of the above-mentioned moving image based on the above-mentioned moving distance and the value of the frame rate in the dynamic shooting of the above-mentioned subject.

29. The dynamic quality management method according to claim 28, wherein the above-mentioned second process generates information on quality management related to the smoothness of the above-mentioned moving image based on whether the evaluation value based on the above-mentioned moving distance and the above-mentioned frame rate value is within a second specified range.

30. The dynamic quality management method according to claim 29, wherein when the above-mentioned moving distance is d, the above-mentioned frame rate is f, and the above-mentioned second specified range is A' < d / f < B', A' and B' are constants determined according to the above-mentioned specified object.

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