Medical image photographing apparatus

Abstract

A medical image photographing apparatus that is easier to visually recognize an object from the outside than a case where two of the supports of a structure having thickened supports are necessary. A CT apparatus includes a radiation source that irradiates radiation, a radiation detector that detects the radiation, a frame that is a ring-shaped frame in which the radiation source and the radiation detector are installed and in which an object is positioned in a cavity, and three supports that hold the frame so as to be able to be raised and lowered in a vertical direction.

Description

Technical Field

[0001] The present invention relates to a medical imaging device. Background Technology

[0002] For example, a medical imaging device such as the computed tomography (CT) apparatus for photographing a standing subject, as described in Patent Document 1, has been proposed. The CT apparatus described in Patent Document 1 includes an imaging section and two supports for holding the imaging section. The imaging section is annular, and the standing subject is positioned within the cavity. The two supports are positioned in the front-rear direction of the subject. The supports are extendable, thereby changing the height of the imaging section.

[0003] The imaging unit includes a radiation source that irradiates the subject, a radiation detector that detects the radiation, and a frame. The radiation source and detector are mounted on the frame. By rotating the frame while irradiating the subject with radiation from the radiation source at a predetermined angle, and by detecting the radiation transmitted through the subject using the radiation detector, multiple projected images can be obtained. Furthermore, by reconstructing these multiple projected images, a tomographic image can be obtained.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2017-077464

[0005] In the CT apparatus described in Patent Document 1, two supports are used to maintain the imaging unit. Therefore, considering factors such as the stability of the imaging unit, it is necessary to thicken the supports.

[0006] In medical imaging devices such as CT scanners described in Patent Document 1, it is preferable that the operator, such as a radiologist, can visually identify the subject from the outside of the medical imaging device when positioning the subject before imaging and during imaging. However, if the structure, as in Patent Document 1, necessitates thickening the support pillars, it becomes difficult to visually identify the subject from the outside of the device. Summary of the Invention

[0007] One embodiment of the technology of the present invention provides a medical imaging device that makes it easier to visually identify the subject from the outside compared to a structure with two supports that have to be thickened.

[0008] The medical imaging device of the present invention comprises: a radiation source for irradiating radiation; a radiation detector for detecting radiation; a frame, which is an annular frame on which the radiation source and the radiation detector are mounted, and the subject is positioned in the cavity; and three or more pillars for holding the frame so that it can be raised and lowered in the vertical direction.

[0009] Preferably, when viewing the frame from above and envisioning it as a polygon with three or more pillars as vertices, the center of the frame is contained within the polygon.

[0010] Preferably, the frame is circular, and the supports keep the frame able to rotate around the subject.

[0011] Preferably, three or more pillars are arranged at equal intervals on the same circumference.

[0012] Preferably, when the support is viewed from above the frame, the support is an arc shape that mimics the shape of the frame.

[0013] Preferably, at least one of the three or more pillars has an opening for visual identification of the subject from the outside.

[0014] Preferably, at least one of the three or more pillars is equipped with at least one of the input device and the display.

[0015] Preferably, the rigidity of the support column that houses at least one of the input device and the display is higher than that of the other supports.

[0016] Preferably, the device includes a connecting component that is connected to the frame at a first connecting position and to the support column at a second connecting position, wherein the first connecting position is higher than the second connecting position.

[0017] Preferably, both the radiation source and the radiation detector protrude from the same side of either the upper or lower edge of the frame.

[0018] Preferably, it is equipped with casters for handling.

[0019] Preferably, the radiation source irradiates a cone-shaped area with radiation.

[0020] Preferably, the subject is positioned inside the cavity in any posture, whether standing or sitting.

[0021] Invention Effects

[0022] According to the technology of the present invention, a medical imaging device is provided that makes it easier to visually identify the subject from the outside compared to a structure where two supports are required to thicken the supports. Attached Figure Description

[0023] Figure 1 This is a three-dimensional diagram representing a CT scanner.

[0024] Figure 2 This is a front view of the main body of the CT device.

[0025] Figure 3 This is a side view of the main body of the CT device.

[0026] Figure 4 This is a top view of the main body of the CT scanner.

[0027] Figure 5 This is a front view of the main body of a CT scanner, showing the subject in a seated position in a wheelchair.

[0028] Figure 6 It is a three-dimensional diagram representing a radiation source, a radiation detector, and radiation.

[0029] Figure 7 This is a diagram showing the lifting mechanism.

[0030] Figure 8 This is a diagram representing a rotating mechanism.

[0031] Figure 9 This is a block diagram representing the processing unit of the CPU in the control device.

[0032] Figure 10 This is a diagram showing the irradiation conditions.

[0033] Figure 11 This diagram shows the situation where the subject is guided into the main body of the device with the frame in the retracted height position and the first rotation position.

[0034] Figure 12 This is a diagram showing the state of the frame when it has rotated to the first rotational position.

[0035] Figure 13 This is a diagram showing a summary of the process when an irradiation field confirmation instruction is input to confirm the irradiation field of radiation.

[0036] Figure 14 This is a diagram showing a summary of the process when an exploration photography instruction is input for exploration photography.

[0037] Figure 15 This is a diagram showing the state of the frame when it has rotated to the third rotation position.

[0038] Figure 16 This is a diagram illustrating the process when formal photography instructions are input for the actual photography.

[0039] Figure 17 This is a diagram showing the state of the frame as it rotates from the fourth rotational position to the fifth rotational position.

[0040] Figure 18 This is a diagram showing a summary of the process when a return instruction is input to return the frame to the retraction height position and the first rotation position.

[0041] Figure 19 This is a diagram showing the state of the frame returning from the fifth rotational position to the first rotational position.

[0042] Figure 20 This is a flowchart illustrating the steps involved in taking tomographic images using a CT scanner.

[0043] Figure 21 This is a flowchart illustrating the steps involved in taking tomographic images using a CT scanner.

[0044] Figure 22 This is a flowchart illustrating the steps involved in taking tomographic images using a CT scanner.

[0045] Figure 23 This is a diagram illustrating another example of a pillar.

[0046] Figure 24 This is a diagram showing how the radiation source and radiation detector protrude from the upper edge of the frame.

[0047] Figure 25 It means Figure 24 The diagram shows the retreat height position and the first rotation position in the manner shown.

[0048] Figure 26 This is another example of the first rotational position.

[0049] Figure 27 This is a diagram illustrating an example of four pillars.

[0050] Figure 28 This is a diagram illustrating an example of five pillars.

[0051] Figure 29 This is a diagram illustrating an example of six pillars.

[0052] Figure 30 This is a diagram showing a lifting mechanism that uses counterweights.

[0053] Symbol Explanation

[0054] 10-CT device, 11-Device body, 12-Control device, 13-Platform, 14, 14A~14C, 110, 115A~115D, 120A, 120B, 125A~125F-Supports, 15-Top plate, 16-Casts, 17, 17A~17C, 116A~116D, 121A, 121B, 126A~126C-Connecting components, 18-Frame, 19-Cavity, 20-Radiation source, 21-Radiation detector, 22, 22A~22C-Screw shaft, 23, 23A~23C-Opening, 24-Modible arm, 25-Touch screen display, 26-Mounting part, 30-Wheelchair, 35-Radiation tube, 36-Irradiation Field light, 37-Illumination field limiter, 40, 130-Lifting mechanism, 41-Nut, 42-Lifting motor, 43-First connecting part, 44-Second connecting part, 45-Bearing, 46-Guide groove, 50-Rotating mechanism, 51-Rotating belt, 52-Rotating motor, 53-Polypotentiometer, 54, 55, 133-Pulleys, 60-Storage unit, 61-Memory, 62-CPU, 63-Display, 64-Input device, 70-Running program, 71-Illumination condition table, 72-Illumination condition information for each command, 75-Receiver, 76-Read / Write control unit (RW control unit), 77-Photography control unit, 78-Image processing unit, 79-Display control unit, 85-Photography menu. 86 - Irradiation conditions, 90 - Irradiation field confirmation instruction, 91 - Irradiation field confirmation command, 95 - Exploration and photography instruction, 96 - Exploration and photography command, 100 - Formal photography instruction, 101 - Formal photography command, 105 - Return instruction, 106 - Return command, 131 - Counterweight, 132 - Steel wire, C - Center of the frame, CC - Circle centered on the frame and along the support, CCW - Counterclockwise direction, CG - Center of gravity of the main body of the device, CP1 - First connection position, CP2 - Second connection position, CW - Clockwise direction, HA - Hexagon with the support as the vertex, PA - Pentagon with the support as the vertex, R - Radiation, RA - Quadrilateral with the support as the vertex, RAC - Radiation with the caster as the apex. Quadrilateral at the vertex, S - Subject, SI - Exploratory image, ST100, ST110, ST120, ST130, ST140, ST150, ST160, ST170, ST180, ST190, ST200, ST210, ST220, ST230, ST240, ST250, ST260, ST270, ST280, ST290, ST300, ST310, ST320, ST330 - Steps, TA - Triangle with the support as the vertex, TI - Tomographic image, W1 - Width of the frame in the height direction, W2 - Width of the radiation source and radiation detector in the height direction, θ - Radiation angle of the radiation. Detailed Implementation

[0055] As an example, such as Figure 1 As shown, the CT device 10 is used to obtain a tomographic image TI (reference) of the subject S. Figure 16 The device comprises a main body 11 and a control device 12. The main body 11 is, for example, located in a radiography room of a medical institution. The control device 12 is, for example, located in a control room adjacent to the radiography room. The control device 12 is a desktop personal computer, a laptop personal computer, or a tablet terminal. The CT device 10 is an example of a "medical imaging device" according to the technology of this invention.

[0056] As an example, such as Figures 1-4 As shown, the main body 11 of the device includes a platform 13, three supports 14A, 14B and 14C, and a top plate 15. The platform 13 is an octagonal flat plate. Casters 16 for handling are installed on the four corners of the back of the platform 13.

[0057] The casters 16 are equipped with a rotation locking mechanism (not shown), which can be activated to lock the rotation of the casters 16 after the main body 11 is positioned. Alternatively, the casters 16 can be removed from the mounting platform 13 after the main body 11 is positioned. Furthermore, a quadrilateral RAC (see reference) is envisioned with the four casters 16 as vertices when viewed from above, such as the frame 18. Figure 1 In the case of ), the center of gravity CG of the main body 11 of the device (reference) Figure 1 The device body 11 is contained within the quadrilateral RAC. The center of gravity CG is, for example, the center of the platform 13. Therefore, the device body 11 can be moved stably. Furthermore, the stability of the device body 11 is improved when it is installed without removing the casters 16.

[0058] Supports 14A to 14C are rectangular plates erected at the four corners of the surface of the mounting platform 13. Supports 14A and 14C are located on the left and right sides of the front side of the device body 11 (the left and right sides in front of the subject S). Support 14B is located at the center of the rear side of the device body 11 (behind the subject S). Top plate 15 is mounted on the upper end of supports 14A to 14C. Top plate 15 is a flat plate with an octagonal shape that mimics the mounting platform 13. Top plate 15 is C-shaped, with a circular cutout in the center and the portion of the device body 11 between supports 14A and 14C cut off on the front side. In the following description, unless otherwise specified, supports 14A to 14C will be collectively referred to as supports 14.

[0059] A connecting component 17A is connected to support column 14A, a connecting component 17B is connected to support column 14B, and a connecting component 17C is connected to support column 14C. A frame 18 is connected to connecting components 17A to 17C. That is, supports 14A to 14C and frame 18 are connected to each other via connecting components 17A to 17C. Furthermore, in the following description, unless otherwise specified, connecting components 17A to 17C will be collectively referred to as connecting component 17.

[0060] The frame 18 is circular. The subject S is positioned at the center C of the cavity 19 of the circular frame 18 (reference). Figure 4 The location of ). Figures 1-4 The image shows the subject S in a standing position with both hands raised above his head, positioned in the image.

[0061] The support column 14 is equipped with a guide rail (not shown) into which the connecting member 17 fits. The connecting member 17 and the frame 18 can move up and down in the vertical direction along the guide rail. That is, the support column 14 holds the frame 18 so that it can move up and down in the vertical direction. Furthermore, the frame 18 can rotate around the subject S with its center C as the central axis. That is, the supports 14A to 14C hold the frame 18 so that it can rotate around the subject S. Alternatively, the support column 14 can be extended or retracted to change the height position of the frame 18.

[0062] The frame 18 is equipped with radiation sources such as X-rays and gamma rays (reference). Figure 6 The radiation source 20 and the radiation detector 21 are located on the frame 18 and positioned opposite each other (180° apart). The radiation source 20 is box-shaped, and the radiation detector 21 is sheet-shaped. When viewed from above, the radiation detector 21 appears as an arc shape mimicking the shape of the frame 18. The frame 18 has a width W1 that is smaller than the width of the radiation source 20 and the radiation detector 21 in the height direction (in this case, the width in the height direction is greater than the width of the radiation detector 21 in the height direction) W2 (see reference). Figure 2 Furthermore, both the radiation source 20 and the radiation detector 21 protrude from the lower edge of the frame 18.

[0063] A screw shaft 22A is provided on support column 14A, a screw shaft 22B is provided on support column 14B, and a screw shaft 22C is provided on support column 14C. Screw shafts 22A to 22C have a height from the mounting platform 13 to the top plate 15. By rotating screw shafts 22A to 22C, connecting components 17A to 17C and the frame 18 move up and down in the vertical direction. Furthermore, in the following description, unless otherwise specified, screw shafts 22A to 22C will be collectively referred to as screw shaft 22.

[0064] Support column 14A has an opening 23A, support column 14B has an opening 23B, and support column 14C has an opening 23C. Openings 23A to 23C are formed by hollowing out most of the supports 14A to 14C into a rectangle. The subject S can be visually identified from the outside of the device body 11 through openings 23A to 23C. Because of openings 23A to 23C, supports 14A to 14C appear to be two in some parts, but since the upper and lower sides of openings 23A to 23C are connected, the number is one. Furthermore, in the following description, unless otherwise specified, openings 23A to 23C will be collectively referred to as opening 23.

[0065] A touchscreen display 25 is mounted on the support column 14A via a movable arm 24. The touchscreen display 25 is operated by an operator of the CT device 10, such as a radiologist. Furthermore, the touchscreen display 25 displays various information to the operator. The touchscreen display 25 is an example of "at least one of an input device and a display" according to the technology of this invention. Furthermore, the support column 14A is an example of "a support column on which at least one of an input device and a display is mounted" according to the technology of this invention.

[0066] Mounting part 26 of movable boom 24 of support column 14A (reference) Figure 4 The thickness of the support is greater than that of other parts, thus increasing rigidity. The mounting part 26 is only provided on the support column 14A, and not on the supports 14B and 14C. Therefore, the rigidity of the support column 14A is higher than that of the supports 14B and 14C.

[0067] Viewed from above, frame 18, etc. Figure 4 In this configuration, with the radiation source 20 positioned at 0° on the front of the device body 11, support column 14A is positioned at 60° on a circle CC centered at the center C of frame 18, support column 14B is positioned at 180° on circle CC, and support column 14c is positioned at 300° on circle CC. That is, supports 14A to 14C are arranged at 120° intervals (equally spaced on the same circumference) on circle CC. Furthermore, assuming a triangle TA (an equilateral triangle inscribed in circle CC) with supports 14A to 14C as vertices, the center C of frame 18 is included within triangle TA. Additionally, angles such as "0°" and "60°" refer not only to complete "0°" and "60°" but also to "0°" and "60°" in the sense of a degree of error generally permissible in the technical field to which this invention pertains and not violating the spirit of this invention. Furthermore, "equally spaced" refers not only to complete equal spacing but also to equal spacing in the sense of a degree of error generally permissible in the technical field to which this invention pertains and not violating the spirit of this invention.

[0068] exist Figures 1-4The image shows an example of a subject S in a standing posture with both hands raised above the head being positioned within cavity 19, but it is not limited to this. As an example, such as... Figure 5 As shown, the CT device 10 can also position a seated subject S in a wheelchair 30 within the cavity 19 for imaging. Furthermore, whether the subject S is standing or seated in a wheelchair 30, it is positioned with its front facing 0°.

[0069] As an example, such as Figure 6 As shown, the radiation source 20 contains a radiation tube 35 and an irradiation field lamp 36. The radiation tube 35 emits radiation R. The irradiation field lamp 36 emits visible light, such as orange, representing the irradiation field of the radiation R.

[0070] Furthermore, the radiation source 20 has an irradiation field limiter 37. The irradiation field limiter 37, also called a collimator, is used to limit the irradiation field of the radiation R directed at the radiation detector 21. The irradiation field limiter 37 has an entrance opening for the radiation R from the radiation tube 35 and an exit opening for the radiation R to exit. Near the exit opening, for example, four shielding plates are provided. The shielding plates are formed of a material that shields the radiation R (e.g., lead). The shielding plates are arranged on each side of a quadrilateral, in other words, assembled in a checkered pattern, forming a quadrilateral irradiation opening through which the radiation R is transmitted. The irradiation field limiter 37 changes the size of the irradiation opening by changing the position of each shielding plate, thereby changing the irradiation field of the radiation R directed at the radiation detector 21. Through the action of the irradiation field limiter 37, a pyramidal radiation R is irradiated from the radiation source 20. The emission angle θ of the radiation R is, for example, 45°.

[0071] The radiation detector 21 may include, for example, a scintillator that converts radiation R into visible light, a TFT (Thin Film Transistor) substrate in which pixels are arranged in a two-dimensional pattern to accumulate charges corresponding to the visible light converted from radiation R, and a signal processing circuit that outputs a voltage signal corresponding to the charges as a projected image. Alternatively, the radiation detector 21 may be of the type that directly detects radiation R rather than visible light converted from radiation R.

[0072] As an example, such as Figure 7 As shown, the lifting mechanism 40, which raises and lowers the connecting component 17 and the frame 18 in the vertical direction, is a ball screw mechanism consisting of the aforementioned screw shaft 22, a ball-bearing nut 41 screwed to the screw shaft 22, and a lifting motor 42 that rotates the screw shaft 22. The lifting motor 42 is mounted on the back of the platform 13. The height of the frame 18 is calculated based on the rotation direction and speed of the lifting motor 42.

[0073] The connecting component 17 has a first connecting portion 43 that connects to the frame 18 and a second connecting portion 44 that connects to the support column 14. The first connecting portion 43 protrudes towards the frame 18, and the second connecting portion 44 protrudes towards the support column 14. The connecting component 17 is generally Z-shaped. A bearing 45 is built into the first connecting portion 43. The bearing 45 is embedded in a guide groove 46 formed throughout the circumference of the frame 18 (see also...). Figure 1 (etc.). The bearing 45 rolls as the frame 18 rotates. A nut 41 is built into the second connection part 44.

[0074] The first connection position CP1 between the first connecting part 43 and the frame 18 is higher by a height H than the second connection position CP2 between the second connecting part 44 and the support column 14. Here, the point where the center of the bearing 45 contacts the guide groove 46 of the frame 18 is designated as the first connection position CP1. And the point where the center of the nut 41 contacts the screw shaft 22 is designated as the second connection position CP2.

[0075] As an example, such as Figure 8 As shown, the rotation mechanism 50 that rotates the frame 18 around the subject S consists of a rotating belt 51 suspended around the entire circumference of the frame 18, a rotation motor 52, and a potentiometer 53. The rotation motor 52 is built into the connecting member 17C and connected to a portion of the rotating belt 51 pulled from the frame 18 via a pulley 54. Driven by the rotation motor 52, the frame 18 rotates clockwise (right) CW and counterclockwise (left) CCW. The potentiometer 53 is built into the connecting member 17B and connected to a portion of the rotating belt 51 pulled from the frame 18 via a pulley 55. The potentiometer 53 has a variable resistor whose resistance value changes according to the rotational position of the frame 18, and outputs a voltage signal corresponding to the rotational position of the frame 18. The rotational position of the frame 18 is calculated based on the voltage signal from the potentiometer 53.

[0076] As an example, such as Figure 9 As shown, the computer constituting the control device 12 includes a storage unit 60, a memory 61, a CPU (Central Processing Unit) 62, a display 63, and an input device 64.

[0077] Storage unit 60 is either built into a computer constituting control device 12 or a hard disk drive connected via cable or network. Alternatively, storage unit 60 may be a disk array consisting of multiple hard disk drives connected together. Storage unit 60 stores control programs such as operating systems, various application programs, and various data associated with these programs. Alternatively, a solid-state drive (SSD) may be used instead of a hard disk drive.

[0078] Memory 61 serves as the working memory for CPU 62 to perform processing. CPU 62 loads the program stored in memory unit 60 into memory 61 and executes the program accordingly. Thus, CPU 62 centrally controls all parts of the computer. Alternatively, memory 61 can also be built into CPU 62.

[0079] The display 63 shows various screens. These screens are operable via a GUI (Graphical User Interface). The computer constituting the control device 12 receives input instructions from the input device 64 through these screens. The input device 64 may be a keyboard, mouse, touchscreen, microphone for voice input, etc.

[0080] The storage unit 60 stores the running program 70. The running program 70 is an application program used to enable the computer to perform the functions of the control device 12. In addition to the running program 70, the storage unit 60 also stores the irradiation condition table 71 and irradiation condition information 72 for each command, etc.

[0081] If program 70 is started, the CPU 62 of control device 12 and memory 61 cooperate to perform the functions of receiving unit 75, read / write (hereinafter referred to as RW) control unit 76, photography control unit 77, image processing unit 78 and display control unit 79.

[0082] The receiving unit 75 receives various operation instructions input by the operator via the touch screen display 25 and input device 64 on the main unit 11. For example, the receiving unit 75 receives the photography menu 85. The receiving unit 75 outputs the photography menu 85 to the RW control unit 76.

[0083] The RW control unit 76 receives the imaging menu 85 from the receiving unit 75. The RW control unit 76 reads the irradiation conditions 86 of the radiation R corresponding to the received imaging menu 85 from the irradiation condition table 71. The RW control unit 76 writes the irradiation conditions 86 read from the irradiation condition table 71 into the irradiation condition information 72 of each command.

[0084] The imaging control unit 77 controls the operation of the radiation source 20 (radiation tube 35, irradiation field lamp 36, and irradiation field limiter 37), the lifting mechanism 40 (lifting motor 42), the rotation mechanism 50 (rotation motor 52 and potentiometer 53), and the radiation detector 21. The imaging control unit 77 reads the irradiation condition 86 from the irradiation condition information 72 of each command. The imaging control unit 77 adjusts the irradiation field by driving the irradiation field limiter 37 according to the irradiation condition 86. Furthermore, the imaging control unit 77 drives the radiation tube 35 according to the irradiation condition 86, emitting radiation R from the radiation tube 35. The imaging control unit 77 outputs the projected image detected by the radiation detector 21 after irradiation by radiation R from the radiation detector 21 to the image processing unit 78.

[0085] The image processing unit 78 receives the projected image from the radiation detector 21. The image processing unit 78 applies various image processing techniques to the projected image. Furthermore, the image processing unit 78 performs reconstruction processing on multiple image-processed projected images to generate a tomographic image TI. The image processing unit 78 outputs the image-processed projected image or tomographic image TI to the display control unit 79.

[0086] The display control unit 79 controls the display of various information on the touch screen display 25 and the display 63. The display control unit 79 receives a projected image or tomographic image TI from the image processing unit 78. The display control unit 79 displays the projected image or tomographic image TI on the touch screen display 25 and the display 63.

[0087] The photography menu 85 includes, for example, photography command ID (Identification Data) and photography techniques (see reference). Figure 10 The imaging command ID is the identification information of the imaging command issued by the physician using tomographic images for diagnosis. The imaging technique consists of the posture of the subject S (standing or sitting), the imaging parts such as the head, neck, and spine, and the attributes of the subject S such as adult male or adult female.

[0088] The imaging command is sent from the Radiology Information System (RIS) (illustrated but not shown) to the control device 12. Under the control of the display control unit 79, the control device 12 displays a list of imaging commands on the display 63. The operator reviews the list of imaging commands to confirm their contents. Next, the control device 12 displays the imaging menu corresponding to the imaging command on the display 63 in a configurable format. The operator selects and inputs the imaging menu corresponding to the imaging command using the operation input device 64.

[0089] As an example, such as Figure 10As shown, irradiation conditions 86 are registered for each radiographic technique in irradiation condition table 71. Irradiation conditions 86 include the tube voltage and tube current applied to the radiation tube 35, as well as the irradiation time of the radiation R. Furthermore, although not illustrated, irradiation conditions 86 also include the size of the irradiation field. Irradiation conditions 86 can be manually fine-tuned by the operator. Alternatively, the product of tube current and irradiation time, the so-called mAs value, can be used instead of tube current and irradiation time as irradiation conditions 86.

[0090] Table 71 of illumination conditions also records the probing position and the fourth rotation position for each photographic technique. The probing position is a combination of the reference height position of the frame 18 in the probing and the second and third rotation positions. The reference height position indicates the height of the frame 18 when the surface of the stage 13 is set to 0 cm. The second rotation position is the position where the radiation source 20 is directly opposite the subject S, i.e., the 0° position. The third rotation position is the position where the radiation source 20 faces the right side of the subject S, i.e., the 90° position. Alternatively, the third rotation position can also be set as the 270° position where the radiation source 20 faces the left side of the subject S.

[0091] Here, exploration radiography refers to preparatory radiography performed to confirm the location of the subject S before the formal radiography, which involves taking multiple projected images at a prescribed angle to generate a tomographic image TI. In exploration radiography, a projected image is obtained by irradiating the frame 18 with a dose of radiation R lower than that used in the formal radiography, with the frame 18 positioned at a reference height and either a second or third rotational position. Hereinafter, the projected image obtained through exploration radiography will be referred to as exploration image SI (refer to...). Figure 14 ).

[0092] There are photographic techniques that register only the second rotational position and those that register both the second and third rotational positions. For example, in the photographic technique "standing adult male head," only the second rotational position is registered. On the other hand, for example, in the photographic technique "sitting adult male spine," both the second and third rotational positions are registered.

[0093] The fourth rotation position is the starting position of the rotation of frame 18 in the formal photography. For example, in the photographic technique "standing adult male with head," the position of 0° is registered as the fourth rotation position. And, for example, in the photographic technique "sitting adult male with spine," the position of 90° is registered as the fourth rotation position.

[0094] Although the illustration is omitted, the illumination condition information 72 for each command registers the illumination condition 86, the exploration imaging position, and the fourth rotation position for each imaging command ID. The imaging control unit 77 reads the illumination condition 86, the exploration imaging position, and the fourth rotation position corresponding to the imaging command ID for the next imaging session from the illumination condition information 72 for each command, and controls the operation of each unit according to the read illumination condition 86, exploration imaging position, and fourth rotation position.

[0095] As an example, such as Figure 11 As shown, when the subject S is guided into the main body 11 of the device, the frame 18, under the control of the camera control unit 77, moves to a retraction height position via the lifting mechanism 40, and rotates to a first rotation position via the rotation mechanism 50. The retraction height position is set at the upper end of the support column 14. More specifically, the retraction height position is the position of the highest point of the lifting range of the frame 18. In this example, the highest point of the lifting range of the frame 18 is approximately at the upper end of the support column 14, and is the position where the second connecting part 44 of the connecting member 17 abuts against the back of the top plate 15. Incidentally, the lowest point of the lifting range of the frame 18 is approximately at the lower end of the support column 14, and is the position where the second connecting part 44 abuts against the surface of the mounting platform 13. As an example, when viewed from above... Figure 11 In the state Figure 12 As shown in the diagram, the first rotational position is a 60° overlap between the radiation source 20 and the support column 14A. The operator guides the subject S into the device body 11 in this position through the entry point between supports 14A and 14C, thereby positioning the subject S. Furthermore, Figure 11 and Figure 12 The arrow shown indicates the direction in which the subject S is guided into the main body 11 of the device.

[0096] As an example, such as Figure 13 As shown, after the operator positions the subject S inside the device body 11, they remain at the designated position on the device body 11 and operate the touch screen display 25 to input an irradiation field confirmation instruction 90 to confirm the irradiation field of radiation R. The receiving unit 75 receives the irradiation field confirmation instruction 90 and outputs it to the photography control unit 77. The photography control unit 77 outputs an irradiation field confirmation command 91 corresponding to the irradiation field confirmation instruction 90 to the radiation source 20, the lifting mechanism 40, and the rotating mechanism 50.

[0097] The irradiation field confirmation command 91 involves moving the frame 18 to the reference height position and rotating the frame 18 to the 0° position. Furthermore, the irradiation field confirmation command 91 also involves illuminating the irradiation field lamp 36 at both the reference height position and the 0° position. The lifting mechanism 40 drives the lifting motor 42 to rotate the screw shaft 22, thereby moving the frame 18 to the reference height position. The rotation mechanism 50 drives the rotation motor 52 to rotate the rotating belt 51, thereby rotating the frame 18 to the 0° position. After the radiation source 20 adjusts the irradiation field limiter 37 to the irradiation field corresponding to the irradiation condition 86, it illuminates the irradiation field lamp 36 to irradiate the irradiation field with visible light.

[0098] The operator visually identifies the visible light from the illumination lamp 36 to determine whether the height and position of the frame 18 and the positioning of the subject S are suitable for shooting. If the height and position of the frame 18 and the positioning of the subject S are deemed unsuitable for shooting, the operator uses the touchscreen display 25 to adjust the height and position of the frame 18 or reposition the subject S. If the height and position of the frame 18 and the positioning of the subject S are deemed suitable for shooting, the operator uses the touchscreen display 25 to input a shutdown instruction for the illumination lamp 36. The receiving unit 75 receives the shutdown instruction and outputs it to the photography control unit 77. The photography control unit 77 shuts down the illumination lamp 36 in response to the shutdown instruction.

[0099] As an example, such as Figure 14 As shown, after confirming the irradiation field of radiation R, the operator moves to the set position of the control device 12 and operates the input device 64 to input the exploration photography instruction 95 for conducting exploration photography. The receiving unit 75 receives the exploration photography instruction 95 and outputs it to the photography control unit 77. The photography control unit 77 outputs exploration photography commands 96 corresponding to the exploration photography instruction 95 to the radiation source 20, the radiation detector 21, and the rotating mechanism 50.

[0100] The exploration and imaging command 96 specifies the position for maintaining the height position to confirm the irradiation field of radiation R and rotating the frame 18 to a second and / or third rotation position. Furthermore, the exploration and imaging command 96 specifies the operation of exploration and imaging at the second and / or third rotation positions. The rotation mechanism 50 drives the rotation motor 52 to rotate the rotating belt 51, thereby rotating the frame 18 to the second and / or third rotation positions. Figure 15 The image shows the state of frame 18 rotated to a position of 90° as the third rotational position.

[0101] The radiation source 20 drives the radiation tube 35 to irradiate the subject S with radiographic radiation R. The radiation detector 21 detects the radiation R that has passed through the subject S, thereby obtaining a projected image. The radiation detector 21 outputs the projected image to the image processing unit 78.

[0102] The image processing unit 78 applies various image processing techniques to the projected image from the radiation detector 21 to generate a detection image SI. The image processing unit 78 outputs the detection image SI to the display control unit 79. The display control unit 79 displays the detection image SI on the touch screen display 25 and the display 63.

[0103] The operator views the exploration image SI on the monitor 63 to reassess whether the height position of the frame 18 and the positioning of the subject S are suitable for shooting. If the exploration image SI determines that the height position of the frame 18 and the positioning of the subject S are not suitable for shooting, the operator returns to the set position of the main body 11 of the device, relights the illumination field light 36 to adjust the height position of the frame 18 or reposition the subject S.

[0104] As an example, such as Figure 16 As shown, if the height of frame 18 and the positioning of subject S are deemed suitable for shooting based on the probe image SI, the operator uses input device 64 to input formal photography instruction 100 for formal photography. Receiving unit 75 receives formal photography instruction 100 and outputs it to photography control unit 77. Photography control unit 77 outputs formal photography command 101 corresponding to formal photography instruction 100 to radiation source 20, radiation detector 21, and rotation mechanism 50.

[0105] The formal photography instruction 101 specifies that the frame 18 is rotated to the fourth rotational position after maintaining the height position at the end of the exploration photography, and then rotated counterclockwise (CCW) at a preset first rotational speed to the fifth rotational position. Furthermore, the formal photography instruction 101 specifies that formal photography will be performed during the rotation of the frame 18 from the fourth rotational position to the fifth rotational position. The rotation mechanism 50 drives the rotation motor 52 to rotate the rotating belt 51, thereby rotating the frame 18 to the fourth rotational position. Then, the rotation mechanism 50 rotates the frame 18 counterclockwise (CCW) at the first preset rotational speed to the fifth rotational position. In this example, the fifth rotational position is the position where the frame has rotated 225° counterclockwise from the fourth rotational position.

[0106] Figure 17 The example illustrates the case where the fourth rotation position is 0°. In this case, the fifth rotation position is 135°, which is 225° of CCW rotation from the 0° position. Additionally, although the illustration is omitted, the fifth rotation position is 225° when the fourth rotation position is 90°, and 315° when the fourth rotation position is 180°.

[0107] The radiation source 20 drives the radiation tube 35 at a predetermined angle, thereby irradiating the subject S with formal radiographic radiation R based on irradiation condition 86 at a predetermined angle. The radiation detector 21 detects the radiation R transmitted through the subject S at a predetermined angle, thereby obtaining multiple projected images. The radiation detector 21 sequentially outputs multiple projected images to the image processing unit 78.

[0108] The image processing unit 78 performs reconstruction processing on multiple projected images from the radiation detector 21 to generate a tomographic image TI. The image processing unit 78 outputs the tomographic image TI to the display control unit 79. The display control unit 79 displays the tomographic image TI on the touch screen display 25 and the display 63.

[0109] The operator views the tomographic image TI on display 63 to determine if a new tomographic image TI needs to be taken. If a new tomographic image TI is determined to be needed, the operator operates input device 64 to re-enter the formal imaging instruction 100.

[0110] As an example, such as Figure 18 As shown, if it is determined that there is no need to re-capture the tomographic image TI, the operator operates the input device 64 to input a return instruction 105 to return the frame 18 to the retraction height position and the first rotation position. The receiving unit 75 receives the return instruction 105 and outputs it to the photography control unit 77. The photography control unit 77 outputs a return command 106 corresponding to the return instruction 105 to the lifting mechanism 40 and the rotation mechanism 50.

[0111] Return instruction 106 is to return frame 18 to the retraction height position and to return frame 18 from the fifth rotation position to the first rotation position in a clockwise direction CW at a second set speed twice the first set speed. The lifting mechanism 40 drives the lifting motor 42 to rotate the screw shaft 22, thereby returning frame 18 to the retraction height position. The rotation mechanism 50 drives the rotation motor 52 to rotate the rotating belt 51, thereby returning frame 18 from the fifth rotation position to the first rotation position in a clockwise direction CW at the second set speed.

[0112] Figure 19 The example illustrates a fifth rotational position of 135°. In this case, the rotation mechanism 50 returns the frame 18 from the 135° position (the fifth rotational position) to a position of 60° (the first rotational position) at a second set rotational speed in a clockwise direction CW. After the frame 18 returns to the retraction height position and then to the first rotational position, the operator retracts the subject S from the main body 11 of the device.

[0113] Next, as an example, refer to Figures 20-22 The flowchart shown illustrates the function of the above structure. If program 70 starts, then as follows... Figure 9 As shown, the CPU 62 of the control device 12 performs the functions of the receiving unit 75, the RW control unit 76, the photography control unit 77, the image processing unit 78, and the display control unit 79.

[0114] First, such as Figure 11 and Figure 12 As shown, with the frame 18 moved to the retraction height position and rotated to the first rotation position, the operator guides the subject S into the device body 11 (step ST100). Then, the operator positions the subject S (step ST110).

[0115] like Figure 13 As shown, after positioning the subject S, the operator inputs an irradiation field confirmation instruction 90 via the touchscreen display 25. The receiving unit 75 accepts the irradiation field confirmation instruction 90 ("Yes" in step ST120). Thus, the irradiation field confirmation command 91 is output from the imaging control unit 77 to the radiation source 20, etc. (step ST130).

[0116] The lifting mechanism 40 operates according to the irradiation field confirmation command 91, moving the frame 18 to the reference height position. Then, the rotating mechanism 50 operates, rotating the frame 18 to the 0° position (step ST140). Next, after the irradiation field limiter 37 is adjusted to the irradiation field corresponding to the irradiation condition 86, the irradiation field lamp 36 is illuminated, irradiating the irradiation field with visible light (step ST150).

[0117] The operator uses the visible light from the illumination lamp 36 to determine whether the height and position of the frame 18 and the positioning of the subject S are suitable for shooting. If the height and position of the frame 18 and the positioning of the subject S are deemed unsuitable for shooting, the operator adjusts the height and position of the frame 18 or repositions the subject S. If the height and position of the frame 18 and the positioning of the subject S are deemed suitable for shooting, the operator inputs a shutdown instruction for the illumination lamp 36 via the touchscreen display 25. The receiving unit 75 receives the shutdown instruction ("Yes" in step ST160). Then, the photography control unit 77 shuts off the illumination lamp 36 (step ST170).

[0118] like Figure 14 As shown, after confirming the irradiation field of radiation R, the operator inputs a probing instruction 95 via input device 64. The receiving unit 75 accepts the probing instruction 95 ("Yes" in step ST180). Consequently, the probing instruction 96 is output from the imaging control unit 77 to the radiation source 20, etc. (step ST190).

[0119] like Figure 15As shown, the rotating mechanism 50 operates according to the exploration and imaging command 96, causing the frame 18 to rotate to the second rotation position and / or the third rotation position (step ST200). Then, the subject S is irradiated with exploration and imaging radiation R from the radiation tube 35, and the radiation detector 21 detects the radiation R that has passed through the subject S to obtain a projected image (step ST210).

[0120] The projected image obtained by the radiation detector 21 is subjected to various image processing by the image processing unit 78 to become the detection image SI. Under the control of the display control unit 79, the detection image SI is displayed on the touch screen display 25 and the display 63 (step ST220).

[0121] The operator refers to the probe image SI to reassess whether the height position of frame 18 and the positioning of subject S are suitable for shooting. If it is determined that the height position of frame 18 and the positioning of subject S are not suitable for shooting, the operator re-lights the illumination field light 36 to adjust the height position of frame 18 or reposition subject S.

[0122] If the height of frame 18 and the positioning of subject S are deemed suitable for shooting, then... Figure 16 As shown, the operator inputs the formal photography instruction 100 via the input device 64. The receiving unit 75 accepts the formal photography instruction 100 ("Yes" in step ST230). As a result, the formal photography command 101 is output from the photography control unit 77 to the radiation source 20, etc. (step ST240).

[0123] like Figure 17 As shown, the rotating mechanism 50 operates according to the formal photography command 101, causing the frame 18 to first rotate to the fourth rotation position (step ST250). Then, the frame 18 rotates counterclockwise (CCW) at a first set rotation speed to the fifth rotation position. During this period, the subject S is irradiated with formal photography radiation R from the radiation tube 35 at a predetermined angle. At that time, the radiation detector 21 detects the radiation R passing through the subject S to obtain multiple projected images (step ST260).

[0124] Multiple projected images obtained by the radiation detector 21 are reconstructed by the image processing unit 78 to become a tomographic image TI. Under the control of the display control unit 79, the tomographic image TI is displayed on the touch screen display 25 and the display 63 (step ST270).

[0125] The operator determines whether a new tomographic image TI needs to be taken. If the operator determines that a new tomographic image TI needs to be taken ("Yes" in step ST280), the operator re-enters the formal imaging instruction 100 via input device 64 and returns to the processing in step ST240.

[0126] If the operator determines that it is unnecessary to re-capture the tomographic image TI (No in step ST280), such as Figure 18 As shown, the operator inputs a return instruction 105 via input device 64. The receiving unit 75 receives the return instruction 105 ("Yes" in step ST290). As a result, the return command 106 is output from the camera control unit 77 to the lifting mechanism 40, etc. (step ST300).

[0127] The lifting mechanism 40 operates according to the return command 106, causing the frame 18 to return to the retraction height position. Furthermore, as... Figure 19 As shown, the rotating mechanism 50 actuates, causing the frame 18 to return from the fifth rotating position to the first rotating position in a clockwise direction CW at a second set rotation speed twice the first set rotation speed (step ST310). After the frame 18 returns to the retraction height position and then to the first rotating position, the operator retracts the subject S from the main body 11 of the device (step ST320). If there is a next shooting command ("Yes" in step ST330), this series of steps ST100 to ST320 is repeated.

[0128] As described above, the CT device 10 includes: a radiation source 20 that irradiates radiation R; a radiation detector 21 that detects radiation R; a frame 18, which is an annular frame 18 on which the radiation source 20 and the radiation detector 21 are mounted, and which positions the subject S within a cavity 19; and three supports 14A to 14C that hold the frame 18 in a vertically movable manner. Therefore, compared to the case with two supports, each support 14 can be made thinner. Thus, a CT device 10 can be provided that makes it easier to visually identify the subject S from the outside compared to the case with two supports, which necessitates thicker supports. The operator can easily position the subject S and easily confirm the safety of the subject S during imaging. Furthermore, compared to the case with two supports, the footprint of the main body 11 can be reduced.

[0129] like Figure 4 As shown, when viewed from above, and considering a triangle TA with the three pillars 14A to 14C as vertices, the center C of the frame 18 is included within the triangle TA.

[0130] Conversely, the case where the center C of frame 18 is not included within triangle TA refers to a so-called cantilevered case, where supports 14A and 14C are positioned on the rear side of the center C but no supports are positioned on the front side of the center C. This cantilevered configuration significantly disrupts the weight balance, thus reducing the stability of frame 18. Therefore, in this embodiment, the three supports 14A to 14C are positioned such that the center C of frame 18 is included within triangle TA with the three supports 14A to 14C as vertices. Therefore, it is possible to suppress the decrease in the stability of frame 18.

[0131] The frame 18 is circular, and the supports 14A to 14C hold the frame 18 so that it can rotate around the subject S. Compared with the case of two supports, the frame 18, which is held to rotate by three supports 14A to 14C, can easily identify the subject S from the outside while maintaining the rotational stability of the frame 18.

[0132] Furthermore, the aforementioned cantilever configuration reduces the rotational stability of the frame 18. As the rotational stability of the frame 18 decreases, the positional relationship between the radiation source 20 and the radiation detector 21 at various angles during formal imaging becomes unstable. Consequently, the projected images obtained at each angle become blurry, resulting in a deterioration in the quality of the tomographic image TI. However, in this embodiment, as described above, the three supports 14A-14C are arranged such that the center C of the frame 18 is included within a triangle TA with the three supports 14A-14C as vertices, thus eliminating concerns about the deterioration of the tomographic image TI caused by the decreased rotational stability of the frame 18.

[0133] like Figure 4 As shown, the three supports 14A to 14C are arranged at equal intervals on the same circumference. Since the weight of the frame 18 is applied most evenly to the three supports 14A to 14C, the stability of the frame 18 can be further improved.

[0134] like Figure 1 As shown, the support column 14 has an opening 23 for identifying the subject S from an external visual perspective. Therefore, a CT device 10 can be provided that makes it easier to identify the subject S from an external visual perspective.

[0135] Furthermore, an example is given in which all three supports 14A to 14C have openings 23A to 23C, but this is not a limitation. For example, it is also possible that only one of the three supports 14A to 14C located on the side where the control device 12 is installed has an opening 23. Moreover, the opening is not limited to a rectangular opening 23 extending along the length direction of the illustrated support 14. It can also be multiple circular openings or mesh-like openings.

[0136] like Figure 1As shown, a touch screen display 25 is mounted on the support column 14A via the movable arm 24. Therefore, the operator can input various instructions such as the irradiation field confirmation instruction 90 at the setting position of the device body 11, or browse the exploration image SI and tomographic image TI as needed, thereby improving the ease of use of the CT device 10.

[0137] Furthermore, the touch screen display 25 is not limited to a combination of an input device and a display; it is sufficient as long as at least one of the input device and the display is mounted on the support 14. Moreover, there may be two or more supports 14 on which at least one of the input device and the display is mounted.

[0138] like Figure 4 As shown, because the mounting portion 26 of the movable arm 24 is provided, the rigidity of the support column 14A is higher than that of the supports 14B and 14C. Therefore, the support column 14A can be prevented from deforming due to the weight of the touch screen display 25, thereby stably holding the touch screen display 25. Alternatively, the support column 14A can be formed of a material with higher rigidity than the supports 14B and 14C.

[0139] like Figure 7 As shown, the CT device 10 includes a connecting member 17, which is connected to the frame 18 at a first connecting position CP1 and to the support column 14 at a second connecting position CP2. Furthermore, the first connecting position CP1 is higher than the second connecting position CP2. Therefore, imaging can always be performed at the first connecting position CP1, which is higher than the second connecting position CP2.

[0140] Furthermore, the highest point of the lifting range of the frame 18 can be made higher than the first connection position CP1 by the difference between the first connection position CP1 and the second connection position CP2, i.e., height H. As a result, the height of the support column 14 can be suppressed. Specifically, when the highest point of the lifting range of the frame 18 is 200cm and the height H is 30cm, the height of the support column 14 can be set to about 170cm. In this way, height restrictions such as those at the entrances and exits of the photography studio can be overcome, allowing for unobstructed movement between rooms using the casters 16. In addition, when the main body 11 of the device is moved using the casters 16, the frame 18 descends from the highest point of its lifting range.

[0141] like Figure 1 As shown, both the radiation source 20 and the radiation detector 21 protrude from the lower edge of the frame 18. Therefore, relatively low photographic parts, such as the waist of a seated subject S, can be photographed without significantly lowering the frame 18.

[0142] The main body of the device 11 is equipped with casters 16 for transport. Therefore, the main body of the device 11 can be moved freely. The installation location of the main body of the device 11 is not limited to the imaging room, but can also be taken to a ward or other places for installation.

[0143] like Figure 6 As shown, the radiation source 20 irradiates a pyramidal radiation source R. Therefore, compared to scanning a fan-shaped radiation source R in the height direction and detecting the radiation source R using a radiation detector composed of one-dimensionally arranged pixels, imaging can be completed in a shorter time. Alternatively, a conical radiation source R can be used instead of a pyramidal radiation source R.

[0144] like Figure 1 and Figure 5 As shown, the subject S is positioned within the cavity 19 in either a standing or sitting posture. Therefore, it can satisfy the needs of doctors who wish to observe soft tissues such as the lungs in their natural state under gravity, or joints such as the hip joint in a state under load and gravity.

[0145] The CT apparatus 10 includes: a radiation source 20 emitting radiation R; a radiation detector 21 detecting radiation R; a circular frame 18 rotating around a subject S positioned within a cavity 19; multiple supports 14 holding the frame 18 in a rotatable and vertically movable manner; a lifting mechanism 40 for lifting the frame 18; and a rotation mechanism 50 for rotating the frame 18. The radiation source 20 and the radiation detector 21 are mounted on the frame 18 in opposing positions. Figure 2 As shown, the frame 18 has a width W1 over its entire circumference that is smaller than the width W2 in the height direction of the radiation source 20 and the radiation detector 21. Figure 18 As shown, the camera control unit 77 activates the lifting mechanism 40 in response to the operator's return instruction 105, controlling the frame 18 to move to a retraction height position set at the highest point of the lifting range of the frame 18, located on the upper side of the support column 14. Furthermore, the camera control unit 77 activates the rotation mechanism 50 in response to the operator's return instruction 105, controlling the frame 18 to rotate to a first rotation position of 60° where the radiation source 20 overlaps with the support column 14A.

[0146] Since the frame 18 rotates to the first rotational position where the radiation source 20 overlaps with the support column 14A, therefore... Figure 11As shown, when the subject S enters the device body 11 between the supports 14A and 14C, the radiation source 20 does not obstruct the subject S. Therefore, it is not necessary to raise the frame 18 to a position where the radiation source 20 passes over the head of the subject S. Therefore, it is not necessary to ensure a relatively large retraction space in the upper part of the device body 11 for the frame 18 to retract to the head of the subject S, as is the case with conventional technology. That is, the device body 11 can be made more compact in the height direction than before.

[0147] like Figure 14 As shown, the photography control unit 77, in response to the exploration photography instruction 95 from the operator, actuates the rotation mechanism 50 to control the movement of the frame 18 to an exploration photography position for exploration photography before formal photography. The exploration photography position is at least one of a second rotation position where the radiation source 20 is directly facing the subject S, and a third rotation position where the side of the radiation source 20 faces the subject S. Therefore, exploration photography can be performed easily without requiring excessive operator intervention.

[0148] like Figure 16 and Figure 17 As shown, the imaging control unit 77 activates the rotation mechanism 50, thereby rotating the frame 18 to the fourth rotation position. Simultaneously, the frame 18 rotates to the fifth rotation position, while the radiation source 20 and radiation detector 21 perform formal imaging. Therefore, formal imaging can be performed easily without requiring excessive operator intervention.

[0149] like Figure 18 and Figure 19 As shown, the camera control unit 77 activates the rotation mechanism 50 after the actual photography, thereby returning the frame 18 from the fifth rotation position to the first rotation position. Therefore, the frame 18 can be easily returned to the first rotation position without requiring much effort from the operator.

[0150] Furthermore, when frame 18 returns from the fifth rotation position to the first rotation position, the camera control unit 77 rotates frame 18 in a direction from the fifth rotation position toward the fourth rotation position (clockwise CW in this example). This direction from the fifth rotation position toward the fourth rotation position is opposite to the rotation direction of frame 18 during actual photography (counterclockwise CCW in this example). Therefore, the radiation source 20 and radiation detector 21 will follow their moving trajectory during actual photography without colliding with the subject S. Thus, as long as the subject S remains stationary, the radiation source 20 and radiation detector 21 will not collide with the subject S, thereby ensuring the safety of the subject S.

[0151] Furthermore, when the frame 18 returns from the fifth rotation position to the first rotation position, the camera control unit 77 rotates the frame 18 at a second set rotation speed faster than the first set rotation speed from the fourth to the fifth rotation position; specifically, it rotates at twice the speed. Therefore, the operation of returning the frame 18 from the fifth rotation position to the first rotation position can be completed in a short time, thereby reducing the pressure on the subject S waiting inside the device body 11.

[0152] The support is not limited to the straight line shape illustrated. For example, as shown... Figure 23 When viewed from above the frame 18, the support column 110 shown can also be an arc shape that mimics the shape of the frame 18. This shape can further enhance the strength of the support column 110.

[0153] Furthermore, an example is shown where both the radiation source 20 and the radiation detector 21 protrude from the lower edge of the frame 18, but this is not the only example. As an example, such as... Figure 24 As shown, both the radiation source 20 and the radiation detector 21 can protrude from the upper edge of the frame 18. In this way, relatively high photographic parts, such as the head of a standing subject S, can be photographed without raising the frame 18 significantly.

[0154] exist Figure 24 In the method shown, as an example, the retreat height position is set to Figure 25 The location shown. In Figure 25 In this configuration, the retraction height position is set at the lower end of the support column 14. More specifically, the retraction height position is the lowest point of the lifting range of the frame 18. As described above, the lowest point of the lifting range of the frame 18 is located approximately at the lower end of the support column 14, and is the position where the first connecting part 43 abuts against the surface of the mounting platform 13. In the connecting member 17, unlike the arrangement where both the radiation source 20 and the radiation detector 21 protrude from the lower edge of the frame 18, the first connecting part 43 is located below, while the second connecting part 44 is located above. In this case, the subject S crosses the frame 18 and enters the device body 11. Furthermore, compared with Figure 11 The arrows shown are the same, Figure 25 The arrow shown indicates the direction in which the subject S is guided into the main body 11 of the device.

[0155] As described above, the width W1 in the height direction of the frame 18 is smaller than the width W2 in the height direction of the radiation source 20 and the radiation detector 21. Therefore, compared to conventional techniques that require the subject to cross the width of the imaging section, which is similar to that of the radiation source 20 and the radiation detector 21, the burden on the subject S is lighter. Consequently, the subject S can enter the device body 11 more easily than before.

[0156] An example of the first rotation position is a 60° overlap between the radiation source 20 and the support column 14A, but it is not limited to this. A 300° overlap between the radiation source 20 and the support column 14C can also be set as the first rotation position. Furthermore, a 180° overlap between the radiation source 20 and the support column 14B can also be set as the first rotation position, allowing the subject S to enter the device body 11 from between the support columns 14B and 14C.

[0157] The element overlapping the support column 14 in the first rotational position is not limited to the radiation source 20. The radiation detector 21 may also overlap the support column 14 in the first rotational position. Furthermore, the element overlapping the support column 14 is not limited to the entire radiation source 20 or the radiation detector 21; it may be at least one of at least a portion of the radiation source 20 and at least a portion of the radiation detector 21. For example, as... Figure 26 As shown, the first rotation position can also be set at the 90° position where the right end of the radiation detector 21 overlaps with the support column 14C. Additionally, with... Figure 12 The arrows shown are the same, Figure 26 The arrow shown indicates the direction in which the subject S is guided into the main body 11 of the device.

[0158] The number of pillars is not limited to three. For example, such as... Figure 27 As shown, the four supports 115A, 115B, 115C, and 115D can also be arranged at positions of 45°, 135°, 225°, and 315°. In this case, the center C of the frame 18 is included within a quadrilateral RA with the four supports 115A to 115D as vertices. Support 115A is connected to the frame 18 via connecting member 116A, and support 115B is connected to the frame 18 via connecting member 116R. Furthermore, support 115C is connected to the frame 18 via connecting member 116C, and support 115D is connected to the frame 18 via connecting member 116D. In this case, for example, the position where the radiation source 20 overlaps with support 115A at 45° is set as the first rotational position, and the subject S is allowed to enter the device body 11 from between support 115A and support 115D.

[0159] Furthermore, as an example, such as Figure 28As shown, reinforcing supports 120A and 120B can also be arranged at a position 90° behind support 14A and at a position 270° behind support 14C. In this case, the center C of frame 18 is also included within a pentagon PA with the five supports 14A-14C, 120A, and 120B as vertices. Support 120A is connected to frame 18 via connecting member 121A, and support 120B is connected to frame 18 via connecting member 121B. In this case, for example, a first rotational position is set at a 90° position where the radiation source 20 overlaps with support 120A, the right end of radiation detector 21 overlaps with support 14C, and the central part of radiation detector 21 overlaps with support 120B, and the subject S enters the device body 11 from between support 14A and support 14C.

[0160] Furthermore, as an example, such as Figure 29 As shown, a pair of supports 125A and 125B can also be arranged at 60°, a pair of supports 125C and 125D at 180°, and a pair of supports 125E and 125F at 300°. In this case, the center C of the frame 18 is also included within the hexagon HA with the six supports 125A to 125F as vertices. Supports 125A and 125B have approximately half the size of support 14A, supports 125C and 125D have approximately half the size of support 14B, and supports 125E and 125F have approximately half the size of support 14C. Supports 125A and 125B are connected to the frame 18 via connecting member 126A, supports 125C and 125D are connected to the frame 18 via connecting member 126B, and supports 125E and 125F are connected to the frame 18 via connecting member 126C. In this case, for example, the position where the radiation source 20 overlaps with the supports 125A and 125B at a 60° angle is set as the first rotational position, and the subject S is brought into the device body 11 from between the supports 125A and 125F. Figure 28 and Figure 29 The examples also show that the arrangement of the pillars does not have to be evenly spaced.

[0161] The lifting mechanism of frame 18 is not limited to the ball screw mechanism illustrated. As an example, it could also employ... Figure 30 The lifting mechanism 130 is shown. Figure 30In this design, the lifting mechanism 130 consists of a counterweight 131, a steel wire 132, and a pulley 133. The counterweight 131 has the weight required to maintain balance with the frame 18 on which the radiation source 20 and radiation detector 21 are mounted. One end of the steel wire 132 is attached to the counterweight 131. The steel wire 132 is inserted into and passes through the top plate 15 and is suspended from the pulley 133 provided on the surface of the top plate 15. The steel wire 132 is again inserted into and passes through the top plate 15, and its other end is attached to the frame 18. The frame 18 is raised and lowered in response to manual lifting operations performed by the operator.

[0162] Thus, if the lifting mechanism 130 using the counterweight 131 is used, the position of the frame 18 can be set according to the operator's own feel. Alternatively, it can be configured such that both the lifting mechanism 40 of the ball screw mechanism and the lifting mechanism 130 using the counterweight 131 are mounted on the main body 11 of the device, and the lifting mechanism 40 and the lifting mechanism 130 can be switched using a clutch or the like.

[0163] Alternatively, the rotary motor 52 can be a stepper motor, and the rotational position of the frame 18 can be calculated based on the number of pulses applied to the rotary motor 52. Furthermore, the frame 18 is not limited to a circular ring, but can also be a polygonal ring.

[0164] As a medical imaging device, a CT device 10 is exemplified, but it is not limited to this. A simple radiographic device that captures projected images frame by frame by changing the angle can also be used. Furthermore, a radiographic device can be used that has a frame with two sets of radiation sources 20 and radiation detectors 21, simultaneously irradiating the subject S from the front and side with radiation R to obtain two projected images, and investigating the anatomical shape of the subject S's hip joint and spine, as well as the connection status between the spine and lower limbs.

[0165] The hardware structure of the computer constituting the control device 12 can be modified in various ways. For example, to improve processing power and reliability, the control device 12 can be composed of multiple computers that are separate as hardware. For example, the functions of the receiving unit 75 and the RW control unit 76, and the functions of the photography control unit 77, the image processing unit 78, and the display control unit 79 can be distributed to two computers. In this case, the control device 12 is composed of two computers.

[0166] Thus, the hardware structure of the computer in the control device 12 can be appropriately modified according to the required performance such as processing power, security, and reliability. Furthermore, not limited to hardware, applications such as the running program 70 can also be duplicated or distributed across multiple storage units for the purpose of ensuring security and reliability.

[0167] In the above embodiments, for example, as the hardware structure of processing units that perform various processes, such as receiving unit 75, RW control unit 76, photography control unit 77, image processing unit 78, and display control unit 79, various processors as shown below can be used. These processors include a general-purpose processor, i.e., CPU 62, that performs the functions of various processing units by executing software (running program 70). In addition, they include processors with circuit structures that can be changed after manufacturing, such as FPGA (Field Programmable Gate Array), i.e., Programmable Logic Device (PLD), and / or processors with circuit structures specifically designed for performing specific processes, such as ASIC (Application Specific Integrated Circuit), i.e., dedicated circuits.

[0168] A processing unit can consist of one of these various processors, or it can consist of a combination of two or more processors of the same or different types (e.g., a combination of multiple FPGAs and / or a combination of a CPU and an FPGA). Furthermore, a single processor can also constitute multiple processing units.

[0169] As examples of a single processor comprising multiple processing units, firstly, in client and server computers, a combination of one or more CPUs and software constitutes a single processor, which performs the functions of multiple processing units. Secondly, in systems-on-chips (SoCs), a processor that implements the overall system functionality including multiple processing units is used, implemented by a single integrated circuit (IC) chip. Thus, various processing units utilize one or more of these processors to form a hardware structure.

[0170] Furthermore, the hardware structure of these various processors, more specifically, can be a circuit composed of combined semiconductor elements and other circuitry.

[0171] The technology of the present invention can also be appropriately combined with the various embodiments and / or variations described above. Furthermore, it is not limited to the embodiments described above, and various structures can be adopted without departing from the spirit of the invention. Moreover, the technology of the present invention relates to programs, and also to storage media that do not temporarily store programs.

[0172] The above description and illustrations are detailed explanations of the parts related to the technology of this invention, and are merely one example of the technology of this invention. For example, the descriptions of the structure, function, effect, and effect described above are examples of the structure, function, effect, and effect of the parts related to the technology of this invention. Therefore, it is of course possible to delete unnecessary parts, add new elements, or replace the above description and illustrations without departing from the spirit of the technology of this invention. Furthermore, to avoid trouble and to facilitate understanding of the parts related to the technology of this invention, explanations of technical common sense that do not require special explanation when implementing the technology of this invention have been omitted from the above description and illustrations.

[0173] In this specification, "A and / or B" has the same meaning as "at least one of A and B". That is, "A and / or B" means that it can be only A, only B, or a combination of A and B. Furthermore, in this specification, when more than three items are expressed by associating them with "and / or", the same meaning as "A and / or B" applies.

[0174] All documents, patent applications and technical standards described in this specification may be referenced in this specification to the same extent as the specific instances in which each document, patent application and technical standard is specifically and separately described for reference.

Claims

1. A medical imaging device, comprising: A radiation source, used to irradiate radiation; A radiation detector, used to detect the radiation; The frame is an annular frame in which the radiation source and the radiation detector are mounted, and the subject is positioned within the cavity; and Three or more pillars hold the frame in a position to rise and fall vertically. At least one of the three or more pillars has an opening for visual identification of the subject from the outside.

2. The medical imaging device according to claim 1, wherein, When viewed from above and conceived as a polygon with the three or more pillars as vertices, the center of the frame is contained within the polygon.

3. The medical imaging device according to claim 1, wherein, The frame is circular in shape. The support pillars keep the frame able to rotate around the subject.

4. The medical imaging device according to claim 3, wherein, The three or more pillars are arranged at equal intervals on the same circumference.

5. The medical imaging device according to claim 3, wherein, When viewed from above the frame, the pillar appears as an arc shape that mimics the shape of the frame.

6. The medical imaging device according to claim 1, wherein, At least one of the three or more pillars is equipped with at least one of the input device and the display.

7. The medical imaging device according to claim 6, wherein, The rigidity of the support column, which is equipped with at least one of the input device and the display, is higher than that of the other supports.

8. The medical imaging device according to claim 1, wherein, The medical imaging device includes a connecting component. The connecting component is connected to the frame at a first connection position and to the support column at a second connection position. The first connection position is higher than the second connection position.

9. The medical imaging device according to claim 1, wherein, Both the radiation source and the radiation detector protrude from either the upper or lower edge of the frame from the same side.

10. The medical imaging device according to claim 1, wherein, The medical imaging device is equipped with casters for transport.

11. The medical imaging device according to claim 1, wherein, The radiation source irradiates the cone-shaped radiation source.

12. The medical imaging apparatus according to any one of claims 1 to 11, wherein, The subject is positioned in the cavity in any posture, either standing or sitting.

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