CT scanning equipment

Abstract

According to the CT scanning equipment, the first shielding body is arranged between the ray source and the detector, so that most of rays are bound in the first shielding body after the rays are emitted from the ray source, and the possibility that the rays are radiated outwards is reduced; the second shielding body is arranged on at least one side of the scanning cavity in the axial direction, and the second shielding body moves in the radial direction of the scanning cavity to make contact with the body of the scanned object, so that the axial opening of the scanning cavity is shielded. The shielding mechanism is formed by the first shielding body and the second shielding body, so that the CT scanning equipment can be conveniently moved to the position of a scanned object (such as an emergency room, an operating room, a ward and an ambulance) for scanning, and the scanned object does not need to be moved to a scanning room; the use convenience and accessibility of the CT scanning equipment are improved, and better user experience is provided; and meanwhile, the CT scanning equipment does not depend on a shielding room any more, so that the site construction cost required by the CT scanning equipment is reduced.

Description

Technical Field

[0001] This application relates to the field of medical technology, and in particular to CT scanning equipment. Background Technology

[0002] CT scans are widely used in modern medical imaging. Because CT scans use high-energy, highly penetrating X-rays, while their use is appropriate, they also pose radiation hazards to areas outside the scanned patient, accompanying persons, and the surrounding environment. To ensure the safety of CT machine operators, patients, and the public, effective shielding of the CT machine is necessary.

[0003] In related technologies, CT scanners are typically installed in a shielded room (scanning room). The walls and glass of the shielded room contain a large amount of radiation-shielding and absorbing materials, such as lead, which effectively prevents X-rays from passing through the scanning room. However, in some potential application locations, such as emergency rooms, operating rooms, wards, and ambulances, the lead layer protection of the shielded room is usually not available, and the scanned object is not easily moved. Therefore, CT scanners have a higher accessibility requirement than traditional CT scanners to achieve greater convenience and user experience. Utility Model Content

[0004] Therefore, it is necessary to provide a CT scanning device to address the issue of insufficient ease of use of CT scanners.

[0005] A CT scanning device, the CT scanning device comprising at least:

[0006] The main frame has a scanning cavity;

[0007] The radiation source is located inside the main frame body;

[0008] The detector is disposed within the main frame and is positioned opposite to the radiation source.

[0009] The first shield has a first clearance hole for the object being scanned to pass through; at least a portion of the first shield is disposed between the radiation source and the detector, and the first shield can rotate synchronously with the radiation source;

[0010] A second shield is located on at least one side of the scanning cavity along its own axial direction, and the second shield is movable radially along the scanning cavity to shield at least a portion of the axial opening of the scanning cavity.

[0011] In one embodiment, the cross-sectional perimeter of the first shield gradually increases from the direction from the radiation source toward the detector.

[0012] In one embodiment, a first portion of the first shield is connected between the radiation source and the detector, a second portion of the first shield is fitted over the radiation source, and a third portion of the first shield is fitted over the detector.

[0013] In one embodiment, the axial opening of the scanning cavity includes an inlet side and an outlet side, and the second shield is provided on both the inlet side and the outlet side;

[0014] The second shield includes a plurality of shielding blades arranged circumferentially along the scanning cavity, each of the shielding blades being configured to be operably movable radially along the scanning cavity to shield at least a portion of the axial opening of the scanning cavity.

[0015] In one embodiment, the edge profile of the shielding blade near the center of the scanning cavity is arc-shaped.

[0016] In one embodiment, the frame body is provided with a plurality of guide members extending radially along the scanning cavity, and the plurality of shielding blades are slidably connected to the plurality of guide members in a one-to-one correspondence; and / or,

[0017] The main frame is also equipped with a sensing device for measuring the distance between the scanned object and the shielding blades.

[0018] In one embodiment, the CT scanning device further includes a third shield;

[0019] The third shield has a second clearance hole for the object being scanned to pass through, and the cross-sectional area of ​​the second clearance hole is smaller than that of the first clearance hole.

[0020] In one embodiment, the third shield includes a first main body and a first hollow portion connected axially to the first main body along the scanning cavity, and the second clearance hole is located on the first main body.

[0021] In one embodiment, the CT scanning device further includes a fourth shield;

[0022] The fourth shield has a third clearance hole for the scanned object to pass through, and the cross-sectional area of ​​the third clearance hole is smaller than that of the first clearance hole.

[0023] In one embodiment, the fourth shield includes a connecting portion and a second main body portion axially connected to the connecting portion along the scanning cavity, the third clearance hole being located on the second main body portion, and the connecting portion being connected to the cavity wall of the scanning cavity.

[0024] In one embodiment, the frame body includes a fixed frame and a rotating frame, wherein the first shield, the radiation source and the detector are all mounted on the rotating frame; and the second shield is mounted on the fixed frame.

[0025] The aforementioned CT scanning equipment, by placing a first shield between the radiation source and the detector, ensures that most of the radiation emitted from the radiation source is confined within the first shield, reducing the possibility of radiation radiating outwards. By placing a second shield on at least one side of the scanning cavity along its axial direction, and by moving the second shield radially along the scanning cavity to contact the body of the person being scanned, the axial opening of the scanning cavity is shielded, thus isolating the radiation emitted from the radiation source from the external environment of the gantry. This further reduces the possibility of radiation radiating or scattering out through the scanning cavity opening, lowering the level of radiation exposure to external personnel and protecting them. The shielding mechanism formed by the first and second shields allows the CT scanning equipment to be easily moved to the location of the person being scanned (such as an emergency room, operating room, ward, or ambulance) for scanning, eliminating the need to move the person to a traditional lead-shielded scanning room. This improves the ease of use and accessibility of the CT scanning equipment and provides a better user experience. Simultaneously, by eliminating the reliance on a shielded room, the construction costs required for the CT scanning equipment are reduced. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a CT scanning device provided in an embodiment of this application.

[0027] Figure 2 for Figure 1 A schematic diagram of the CT scanning equipment shown from another perspective.

[0028] Figure 3 for Figure 1 A perspective view of the CT scanning equipment shown.

[0029] Figure 4 for Figure 3 A half-section view of the CT scanning equipment shown.

[0030] Figure 5 for Figure 3 A schematic diagram of the first shield in the CT scanning device shown.

[0031] Figure 6 for Figure 3 A schematic diagram of the second shield in the CT scanning device shown.

[0032] Figure 7 for Figure 3 A schematic diagram of the second shield in the CT scanning device shown from another perspective.

[0033] Figure 8 for Figure 3 A schematic diagram of the CT scanning equipment shown from another perspective.

[0034] Figure 9 for Figure 3 The diagram shows the first and third shielding elements in the CT scanning device.

[0035] Figure 10 for Figure 9 A schematic diagram of the third shield in the CT scanning equipment shown.

[0036] Figure 11 for Figure 3 A schematic diagram of the fourth shield in the CT scanning equipment shown.

[0037] Figure 12 for Figure 11 The diagram shows the fourth shield in the CT scanning equipment installed on the main frame.

[0038] Reference numerals: 10, CT scanning equipment; 100, main frame; 110, scanning cavity; 120, installation space; 210, radiation source; 220, detector; 310, first shield; 311, first clearance hole; 320, second shield; 321, shield blade; 322, guide; 330, third shield; 331, second clearance hole; 332, first main body; 333, first hollow part; 340, fourth shield; 341, third clearance hole; 342, connecting part; 343, second main body; 410, scanning bed. Detailed Implementation

[0039] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0040] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0041] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0045] See Figures 1 to 3 As shown, a CT scanning device 10 provided in one embodiment of this application includes a gantry body 100, a radiation source 210, a detector 220, a first shield 310, and a second shield 320. The gantry body 100 has a scanning cavity 110. The radiation source 210 is disposed within the gantry body 100 and is used to generate a radiation beam. The detector 220 is disposed within the gantry body 100 and is disposed opposite to the radiation source 210. The detector 220 is used to receive radiation from the radiation beam. The first shield 310 has a first clearance hole 311 for the object being scanned to pass through. At least a portion of the first shield 310 is disposed between the radiation source 210 and the detector 220, and the first shield 310 can rotate synchronously with the radiation source 210. The second shield 320 is located on at least one side of the scanning cavity 110 along the axial direction and can move radially along the scanning cavity 110 to shield at least a portion of the axial opening of the scanning cavity 110. The first clearance hole 311 is coaxial with the scanning cavity 110, and the cross-sectional area of ​​the first clearance hole 311 can be smaller than the cross-sectional area of ​​the scanning cavity 110.

[0046] The aforementioned CT scanning device 10, by setting a first shield 310 between the radiation source 210 and the detector 220, ensures that most of the radiation emitted from the radiation source 210 is confined within the first shield 310, reducing the possibility of radiation escaping. By setting a second shield 320 on at least one side of the scanning cavity 110 along its axial direction, and by moving the second shield 320 radially along the scanning cavity 110 to contact the body of the scanned object, the opening of the scanning cavity 110 is shielded, thus isolating the radiation emitted from the radiation source 210 from the external environment. This further reduces the possibility of radiation escaping through the opening of the scanning cavity 110, lowering the radiation level to external users and protecting them. The shielding mechanism formed by the first shield 310 and the second shield 320 allows the CT scanning device 10 to be easily moved to the location of the scanned object without requiring the object to be moved, improving the ease of use of the CT scanning device 10. Simultaneously, it eliminates the need for a shielded room, thereby reducing the site construction costs required for the CT scanning device 10. The first shield 310 can be connected between the radiation source 210 and the detector 220 by means of welding or other methods. In a practical application scenario, the CT scanning device 10 can be an imaging device with a radiation source 210, such as a CT scanner. The radiation source 210 can be an X-ray generator such as an X-ray tube.

[0047] like Figure 3 and Figure 5 As shown, in one embodiment, the cross-sectional perimeter of the first shield 310 gradually increases from the direction of the X-ray source 210 toward the detector 220. Since the trajectory of the X-ray beam emitted from the X-ray source 210 is divergent, by setting the cross-sectional perimeter of the first shield 310 to gradually increase, the binding effect of the X-ray is ensured, and the possibility of scattering and outward radiation is reduced.

[0048] like Figures 3 to 5 As shown, the first shield 310 is further a hollow cone structure, which ensures the reliability of the X-ray beam being received by the detector 220 while improving the shielding effect of the X-ray.

[0049] like Figure 5 and Figure 9As shown, in some embodiments, the first shield 310, in addition to being disposed between the radiation source 210 and the detector 220, extends beyond the radiation source 210 and the detector 220 and wraps around the outside of the radiation source 210 and the detector 220. That is, the first shield 310 includes three parts: the first part 314 of the first shield 310 is disposed between the radiation source 210 and the detector 220, and the first part 314 has a conical structure; the second part 312 of the first shield 310 corresponds to the position of the radiation source 210 and is sleeved on the outside of the radiation source 210, and the shape of the second part 312 is adapted to the shape of the radiation source 210, that is, it is cylindrical; the third part 313 of the first shield 310 corresponds to the position of the detector 220 and is sleeved on the outside of the detector 220, and the shape of the third part 313 is adapted to the shape of the detector 220, that is, it is partially annular. The first shield 310 forms a fully enclosed structure, thereby enclosing the surfaces of the radiation source 210 except for the emitting surface, reducing the possibility of scattered radiation leaking out from all directions, and enclosing every surface of the detector 220 except for the receiving surface, reducing the possibility of radiation transmission through the detector 220, improving the confinement effect of the radiation, reducing the possibility of radiation leakage, and thus avoiding radiation risks.

[0050] In some embodiments, the frame body 100 includes a fixed frame (not shown) and a rotating frame (not shown) that can rotate relative to the fixed frame. The first shield 310, the radiation source 210 and the detector 220 are all mounted on the rotating frame and rotate with the rotating frame; the second shield 320 is mounted on the fixed frame.

[0051] like Figure 2 and Figure 3 As shown, the axial sides of the scanning cavity 110 are the inlet side and the outlet side of the scanning cavity 110. Figure 2From the perspective of the scanner, the inlet side of the scanning cavity 110 is the side where the scanning bed 410 first enters, which is located on the right side of the frame body 100; the outlet side of the scanning cavity 110 is the side opposite to the inlet side, which is located on the left side of the frame body 100. In one embodiment, a second shield 320 is provided on both the inlet side and the outlet side of the scanning cavity 110; the second shield 320 includes a plurality of shielding blades 321 arranged circumferentially along the scanning cavity 110, each shielding blade 321 being configured to be operably movable radially along the scanning cavity 110 to shield at least a portion of the axial opening of the scanning cavity 110. For example, in this embodiment, there are four shielding blades 321, which are arranged in a cross shape. The two opposing shielding blades 321 are the same in shape and size, and the shapes and sizes of adjacent shielding blades 321 can be the same or different. Each shielding blade 321 can move radially in a centripetal and centrifugal motion, thereby shielding or opening the opening of the scanning cavity 110.

[0052] like Figure 2 As shown, in some embodiments, during the scanning process, when the object being scanned does not pass through the exit side of the scanning cavity 110, the second shield 320 on the exit side can completely seal the exit of the scanning cavity 110, further reducing the possibility of radiation leakage.

[0053] like Figure 3 , Figure 6 and Figure 7 As shown, in one embodiment, the edge contour of the shielding blade 321 near the center of the scanning cavity 110 is arc-shaped, so that an opening is formed between the multiple shielding blades 321 to allow the scanned object to pass through, thereby maximizing the shielding of the exit of the scanning cavity 110. Specifically, the shielding blade 321 is concave arc-shaped, which can fit the human body better, and the wrapping and shielding effect is better, further reducing radiation leakage.

[0054] like Figure 6 and Figure 7 As shown, in one embodiment, the main frame 100 is provided with a plurality of guide members 322 extending radially along the scanning cavity 110, and a plurality of shielding blades 321 are slidably connected to the plurality of guide members 322 in a one-to-one correspondence. The guide members 322 guide the movement of the shielding blades 321, improving the movement accuracy of the shielding blades 321, thereby improving the reliability of the plurality of shielding blades 321 in shielding the opening of the scanning cavity 110 and reducing the possibility of radiation leakage.

[0055] Furthermore, the main frame 100 is also equipped with a sensing device for measuring the distance between the scanned object and the shielding blades 321. Specifically, the sensing device can be a rangefinder (not shown). By obtaining the distance between the scanned object and the shielding blades 321 through the rangefinder, the moving distance of the shielding blades 321 can be determined, allowing them to move until they come into contact with the body of the scanned object, thereby shielding the radiation and reducing the possibility of radiation leakage.

[0056] like Figure 4 and Figure 9 As shown, in one embodiment, the CT scanning device 10 further includes a third shield 330; the third shield 330 has a second clearance hole 331 for the scanned object to pass through, and the cross-sectional area of ​​the second clearance hole 331 is smaller than the cross-sectional area of ​​the first clearance hole 311. Specifically, the third shield 330 includes a first main body 332 and a first hollow part 333 connected axially to the first main body 332 along the scanning cavity 110, and the second clearance hole 331 is located on the first main body 332. The first main body 332 can be a thin cylindrical structure with a circular or elliptical second clearance hole 331 at its center. Both the first main body 332 and the second clearance hole 331 can be concentrically arranged with the scanning cavity 110; the first hollow part 333 can be a thin-walled cylindrical structure, which is connected to one axial side of the first main body 332. The edges of the first main body 332 and the first hollow part 333 can overlap, or the edges can not overlap and present a stepped shape. The first main body 332 can be connected to the first clearance hole 311 of the first shield 310 and is mounted on the aforementioned fixed frame. Even if the first shield 310 rotates with the radiation source 210, the position of the third shield 330 remains fixed. By setting the third shield 330, the stray radiation and leakage of radiation are further suppressed, thus reducing their impact on personnel outside the equipment. The third shield 330 can be positioned between the first shield 310 and the second shield 320.

[0057] like Figure 11 and Figure 12As shown, in one embodiment, the CT scanning device 10 further includes a fourth shield 340; the fourth shield 340 has a third clearance hole 341 for the scanned object to pass through, and the cross-sectional area of ​​the third clearance hole 341 is smaller than the cross-sectional area of ​​the first clearance hole 311. Specifically, the fourth shield 340 is disposed between the third shield 330 and the second shield 320, and is connected to the cavity wall of the scanning cavity 110. Specifically, the fourth shield 340 includes a connecting portion 342 and a second main body portion 343 connected to the connecting portion 342 along the axial direction of the scanning cavity 110. The third clearance hole 341 is located on the second main body portion 343. The connecting portion 342 can be spherical, such as an ellipsoidal sphere, and can be mated to the aforementioned second clearance hole 331. The second main body portion 343 can be a thin cylindrical structure, and the edge of the second main body portion 343 is connected to the cavity wall of the scanning cavity 110. By providing the fourth shield 340, the stray radiation and leakage of X-rays are further suppressed, thus reducing their impact on personnel outside the device. like Figure 4 As shown, there is an installation space 120 between the third shield 330 and the second shield 320, and the fourth shield 340 is located within the installation space 120.

[0058] The first shield 310, second shield 320, third shield 330, and fourth shield 340 can all be made of tungsten-based alloy materials, which are non-toxic, pollution-free, and more environmentally friendly than traditional lead shielding materials, and are harmless to the human body. In other embodiments, the second shield 320 can also be made of flexible materials such as lead-free multilayer polymer composite materials like tungsten / ethylene-octene copolymer or bismuth / ethylene-octene copolymer, allowing it to completely conform to the body of the scanned object, ensuring the shielding effect; at the same time, it will not cause discomfort to the scanned object when in contact with the body. The second shield 320, third shield 330, and fourth shield 340 can be attached to the fixed frame of the main frame 100.

[0059] Furthermore, such as Figure 1 As shown, the CT scanning device 10 includes a scanning bed 410. During the scanning process, the object to be scanned can be placed on the scanning bed 410 and moved into the scanning cavity 110 via the scanning bed 410, thereby performing scanning and detection on the object. The shielding mechanism described above forms a shield, allowing the CT scanning device 10 to be easily moved to the location of the object to be scanned (such as the emergency room, operating room, ward, and ambulance) for scanning without the object to be scanned being moved to the scanning room. This improves the ease of use and accessibility of the CT scanning device 10 and provides a better user experience. At the same time, it no longer relies on a shielded room, thereby reducing the site construction cost required for the CT scanning device.

[0060] In some embodiments, the bottom of the CT scanning device is equipped with rollers (not shown), which can be used to easily push the CT scanning device into the operating room or ward for scanning without moving the object being scanned, thus improving its ease of use.

[0061] The aforementioned CT scanning device 10, by setting a first shield 310 between the radiation source 210 and the detector 220, ensures that most of the radiation emitted from the radiation source 210 is confined inside the first shield 310, reducing the possibility of radiation radiating outward. By setting a second shield 320, a third shield 330, and a fourth shield 340 on both sides of the axial direction of the scanning cavity 110, the second shield 320 moves radially along the scanning cavity 110 to contact the body of the scanned object, thereby shielding the opening of the scanning cavity 110. Combined with the setting of the third shield 330 and the fourth shield 340, the radiation radiated and scattered through the space of the scanning cavity 110 is minimized. The first shield 310, the second shield 320, the third shield 330, and the fourth shield 340 work together to form an overall shielding mechanism, which allows the CT scanning device 10 to be easily moved to the location of the object being scanned (such as the emergency room, operating room, ward, and ambulance) for scanning without the object being scanned needing to be moved to the scanning room. This improves the ease of use and accessibility of the CT scanning device 10 and provides a better user experience. At the same time, it no longer relies on a shielded room, thereby reducing the site construction cost required for the CT scanning device 10.

[0062] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A CT scanning device, characterized in that, The CT scanning equipment includes at least: The main frame (100) has a scanning cavity (110); A radiation source (210) is disposed within the main body of the frame (100); The detector (220) is disposed inside the frame body (100) and is positioned opposite to the radiation source (210); The first shield (310) is provided with a first clearance hole (311) for the object being scanned to pass through; at least a portion of the first shield (310) is disposed between the radiation source (210) and the detector (220), and the first shield (310) can rotate synchronously with the radiation source (210); A second shield (320) is located on at least one side of the scanning cavity (110) along its own axial direction. The second shield (320) is movable radially along the scanning cavity (110) to shield at least a portion of the axial opening of the scanning cavity (110).

2. The CT scanning device according to claim 1, characterized in that, The cross-sectional perimeter of the first shield (310) gradually increases from the direction from the radiation source (210) to the detector (220).

3. The CT scanning device according to claim 1, characterized in that, The first part (314) of the first shield (310) is connected between the radiation source (210) and the detector (220), the second part (312) of the first shield (310) is sleeved outside the radiation source (210), and the third part (313) of the first shield (310) is sleeved outside the detector (220).

4. The CT scanning device according to claim 1, characterized in that, The axial opening of the scanning cavity (110) includes an inlet side and an outlet side, and the second shield (320) is provided on both the inlet side and the outlet side; The second shield (320) includes a plurality of shielding blades (321) arranged circumferentially along the scanning cavity (110), each of the shielding blades (321) being configured to be operably movable radially along the scanning cavity (110) to shield at least a portion of the axial opening of the scanning cavity (110).

5. The CT scanning device according to claim 4, characterized in that, The edge contour of the shielding blade (321) near the center of the scanning cavity (110) is arc-shaped.

6. The CT scanning device according to claim 4, characterized in that, The frame body (100) is provided with a plurality of guide members (322) extending radially along the scanning cavity (110), and the plurality of shielding blades (321) are slidably connected to the plurality of guide members (322) in a one-to-one correspondence; and / or, The frame body (100) is also equipped with a sensing device for measuring the distance between the scanned object and the shielding blade (321).

7. The CT scanning device according to claim 1, characterized in that, The CT scanning equipment also includes a third shield (330); The third shield (330) has a second clearance hole (331) for the object being scanned to pass through, and the cross-sectional area of ​​the second clearance hole (331) is smaller than the cross-sectional area of ​​the first clearance hole (311).

8. The CT scanning device according to claim 7, characterized in that, The third shield (330) includes a first main body (332) and a first hollow part (333) axially connected to the first main body (332) along the scanning cavity (110), and the second clearance hole (331) is located on the first main body (332).

9. The CT scanning device according to claim 1, characterized in that, The CT scanning device also includes a fourth shield (340); The fourth shield (340) has a third clearance hole (341) for the object being scanned to pass through, and the cross-sectional area of ​​the third clearance hole (341) is smaller than the cross-sectional area of ​​the first clearance hole (311). The fourth shield (340) includes a connecting part (342) and a second main body part (343) axially connected to the connecting part (342) along the scanning cavity (110). The third clearance hole (341) is located on the second main body part (343), and the connecting part (342) is connected to the cavity wall of the scanning cavity (110).

10. The CT scanning device according to claim 1, characterized in that, The main frame (100) includes a fixed frame and a rotating frame. The first shield (310), the radiation source (210) and the detector (220) are all mounted on the rotating frame; the second shield (320) is mounted on the fixed frame.

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