Dental CBCT (cone beam computed tomography) rotating rack capable of realizing off-axis scanning

Abstract

The invention discloses a dental CBCT rotating rack capable of achieving off-axis scanning, and belongs to the technical field of dental scanning, the dental CBCT rotating rack comprises a rack body, a radiation source assembly and a detector assembly, the rack body comprises a rack fixing plate, a movable rack body and a rack body moving assembly, the rack fixing plate is fixedly installed on a rotating shaft of the rotating rack, and the movable rack body is fixedly installed on the rack fixing plate; the movable frame body is in sliding fit with the rack fixing plate, and the frame body moving assembly is used for driving the movable frame body to move along the x axis; the radiation source assembly and the detector assembly are close to the two sides of the movable frame body in the x-axis direction respectively, and the movable frame body is provided with a detection movement assembly for driving the detector assembly to move in the x-axis direction. The multi-mode imaging device has the advantages that the patient can be conveniently imaged in different modes, the examination efficiency is improved, and the space consistency of multi-mode imaging is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of dental scanning, and more particularly to a dental CBCT rotating gantry capable of off-axis scanning. Background Technology

[0002] Cone-beam computed tomography (CBCT) is the core of modern dental imaging. It primarily uses an X-ray emitting module and a flat-panel detector that rotates around the patient's head to rapidly acquire three-dimensional data, providing diagnostic information for fields such as implantology, orthodontics, endodontics, and maxillofacial surgery. To meet comprehensive clinical needs, a dental CBCT device typically integrates three basic imaging modes: a CT mode providing three-dimensional information, a panoramic mode providing two-dimensional macroscopic images of the entire dental arch, and a lateral mode for cephalometric measurements.

[0003] Under the existing technical architecture, the three imaging modes mentioned above have different positioning requirements for patients due to their different imaging principles. Specifically, the panoramic mode requires the patient's dental arch to be close to and aligned with a narrow, pre-set tomographic curve, which is usually closest to the detector assembly of the rotating frame that receives the X-ray signal; the CT mode requires the patient's head to be located at the rotation center of the gantry, which is relatively far back from the detector assembly of the rotating frame that receives the signal; and the lateral mode requires the patient's head to be positioned far away from the radiation source assembly of the rotating frame that emits the X-ray signal in order to obtain a clear lateral projection image.

[0004] Because the distance between the radiation source component and the center of the rotating frame of traditional equipment is relatively fixed, it is difficult to flexibly change the position of the imaging center. In order to meet the specific requirements of different imaging modes for the patient's position, the patient must be passively moved back and forth during the examination. This method makes the operation process of the patient cumbersome and the examination efficiency low when imaging in different modes, and it is difficult to ensure the spatial consistency of multi-mode imaging. Therefore, improvements are needed. Summary of the Invention

[0005] To facilitate imaging in different modes for patients, improve examination efficiency, and ensure spatial consistency of multi-mode imaging, this application provides a dental CBCT rotating gantry capable of off-axis scanning.

[0006] This application provides a dental CBCT rotating gantry capable of off-axis scanning, employing the following technical solution: A dental CBCT rotating gantry capable of off-axis scanning includes a gantry body, a radiation source assembly, and a detector assembly. The gantry body comprises a gantry fixing plate, a movable frame, and a frame motion assembly. The gantry fixing plate is fixedly mounted on the rotation axis of the rotating gantry. The movable frame slides against the gantry fixing plate. The frame motion assembly drives the movable frame to move along the x-axis. The radiation source assembly and the detector assembly are located on opposite sides of the movable frame along the x-axis. The movable frame is equipped with a detection motion assembly that drives the detector assembly to move along the x-axis.

[0007] By adopting the above technical solution, when the patient's head is fixed in the middle of the rotating gantry for CT and panoramic imaging, the position of the movable gantry remains unchanged. The detector assembly is driven by the motion component to move along the x-axis towards or away from the patient's head. When lateral imaging is required, the detector assembly is positioned away from the source assembly, and the movable gantry is driven by the gantry motion component to move along the x-axis, adjusting the distance between the source assembly and the patient's head. Thus, accurate imaging in three modes can be completed without the patient being positioned in a fixed position. This is convenient, fast, and has high examination efficiency. Furthermore, the patient's position remains unchanged, which helps to ensure spatial consistency and imaging stability in multi-mode imaging.

[0008] Optionally, the detection motion assembly includes a detection motor, a detection lead screw, and a detection slider. The detection lead screw is set along the x-axis and rotatably mounted on the movable frame. The detection lead screw passes through and is threaded into the detection slider. The detection slider slides along the x-axis and is fitted onto the movable frame. The detection motor is used to drive the detection lead screw to rotate. The detector assembly is mounted on the detection slider.

[0009] By adopting the above technical solution, when the probe motor drives the probe screw to rotate, the probe slider drives the detector assembly to move together along the x-axis, thereby achieving precise adjustment of the detector's position in the x-axis direction, which is convenient, stable, and facilitates precise adjustment of CT mode and panoramic mode.

[0010] Optionally, a detection drive wheel is fixedly installed at the output end of the detection motor, and a detection driven wheel is coaxially fixedly connected to the detection lead screw. A detection timing belt is wound between the detection drive wheel and the detection driven wheel.

[0011] By adopting the above technical solution, it is beneficial to realize the separate layout of the detection motor and the detection screw, thereby providing greater flexibility for the internal structure design of the frame, making it easier to place the detection motor in the optimal position, thus effectively utilizing the internal space of the frame, and ensuring the stability of the detection motor driving the detection screw to rotate.

[0012] Optionally, the detector assembly includes a detector body, a detector mounting frame, and a detector motion assembly. The detector mounting frame includes a first frame and a second frame. The first frame is mounted on the detector slider, the detector body is mounted on the second frame, and the detector motion assembly is mounted on the detector mounting frame and is used to drive the first frame to move in the vertical direction.

[0013] By adopting the above technical solution, it is easy to adjust the position of the detector body in the vertical plane by driving the movement of the first frame through the detection motion component. This allows the detector body to be flexibly adapted to the needs of different imaging modes, making it highly applicable. At the same time, when the detector body receives signals and images in different modes, the reciprocating motion in the vertical direction facilitates the acquisition of a larger area, fully ensuring the imaging acquisition effect.

[0014] Optionally, the detection motion assembly includes a first motor and a first lead screw. The first frame has a vertical groove extending in the vertical direction. The second frame is fixedly installed with a vertical slider. The vertical slider slides and engages in the vertical groove. The first lead screw is set in the vertical direction and rotatably installed on the first frame. The first lead screw passes through and is threaded into the vertical slider. The first motor is used to drive the first lead screw to rotate.

[0015] By adopting the above technical solution, when the first motor drives the first lead screw to rotate, the vertical slider drives the first frame and the detector body to move in the vertical direction, which is convenient and stable, and facilitates the precise adjustment of the vertical position of the second frame.

[0016] Optionally, the second frame is provided with a horizontal motion assembly, which includes a horizontal motor, a horizontal lead screw, a horizontal guide rod, and a horizontal slider. The horizontal lead screw and the horizontal guide rod are both arranged along the y-axis. The horizontal lead screw is rotatably mounted on the second frame, and the horizontal guide rod is fixedly mounted on the second frame. There are two horizontal sliders, both of which are fixedly mounted on the detector body. The horizontal lead screw passes through and is threaded into one of the horizontal sliders, and the horizontal guide rod passes through and slides into the other horizontal slider. The horizontal motor is used to drive the horizontal lead screw to rotate.

[0017] By adopting the above technical solution, when the horizontal motor drives the horizontal lead screw to rotate, the two horizontal sliders drive the detector body to move along the y-axis direction, which facilitates the calibration and adjustment of the detector body's position in the y-axis direction according to the scanning requirements during the imaging process, and helps to further enhance applicability.

[0018] Optionally, the frame motion assembly includes a frame motor, a frame lead screw, a frame guide rail, and a frame fixing block. The frame lead screw is arranged along the x-axis and rotatably mounted on the movable frame. The frame lead screw passes through and is threaded into the frame fixing plate. The frame motor is used to drive the frame lead screw to rotate. The frame guide rail is arranged along the x-axis and fixedly mounted on the movable frame. The frame fixing block is fixedly mounted on the frame fixing plate. The frame guide rail passes through and slides into the frame fixing block.

[0019] By adopting the above technical solution, when the frame motor drives the frame screw to rotate, the entire movable frame and the frame guide rail slide together along the x-axis under the limiting action of the frame fixing block, thereby realizing the synchronous off-axis adjustment of the source component and the detector component as a whole, which is convenient, stable, and facilitates the precise adjustment required for the side position mode.

[0020] Optionally, a fixed rack is fixedly installed on the top of the movable frame along the x-axis, and a driven rack is slidably fitted on the top of the movable frame along the x-axis. A counterweight is installed on the driven rack. A connecting frame is fixedly installed on the frame fixing plate. A rotating gear is rotatably installed on the connecting frame. The rotating gear is located between the fixed rack and the driven rack and meshes with the fixed rack and the driven rack.

[0021] By adopting the above technical solution, when the movable frame moves along the x-axis toward or away from the fixed plate of the frame, the driven rack drives the counterweight to move in the opposite direction along the x-axis through the cooperation of the rotating gear and the fixed rack. This facilitates the dynamic balance of torque during the off-axis movement of the movable frame, effectively eliminates vibration and off-axis load caused by the eccentricity of the movable frame mass, and ensures that the equipment can maintain relatively stable accuracy and smooth operation under long-term high-frequency off-axis scanning, which is conducive to extending the service life of the equipment.

[0022] Optionally, there are two fixed racks, two driven racks, two connecting frames and two rotating gears distributed along the y-axis, and multiple counterweights distributed along the x-axis. The two ends of each counterweight are fixedly installed to the two driven racks by bolts.

[0023] By adopting the above technical solution, the two sets of transmission units distributed along the y-axis share the load, which effectively avoids torsional deformation caused by unilateral force on the driven rack; the distribution of multiple counterweights along the x-axis helps to ensure that the movable frame obtains more accurate torque compensation at different offset positions; and the counterweights and driven racks are fixed with bolts, which facilitates rapid and accurate adjustment of the counterweight mass, thereby ultimately improving the operational reliability of the equipment.

[0024] Optionally, the source assembly includes a source frame and a source body mounted on the source frame. The source frame is fixedly mounted with a rotating mounting plate. The rotating mounting plate has multiple rotating adjustment slots circumferentially distributed around its own axis. Each of the rotating adjustment slots is provided with an adjustment bolt that passes through itself and is threadedly engaged with the movable frame.

[0025] By adopting the above technical solution, the adjustment bolts are turned and the rotating mounting plate is rotated, which facilitates the fine adjustment of the circumferential angle of the radiation source assembly. This is beneficial for the precise calibration of the beam output direction of the radiation source, ensuring that the emission axis is perpendicularly aligned with the detector receiving plane, and effectively solving the problem of optical path deviation caused by processing errors or assembly tolerances.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. Precise imaging in three modes can be completed without the patient remaining stationary, which is convenient, fast, and efficient. The patient's position remains unchanged, which helps to ensure the spatial consistency and imaging stability of multi-mode imaging.

[0027] 2. The motion component drives the movement of the first frame to adjust the position of the detector body in the vertical plane, so that the detector body can be flexibly adapted to the needs of different imaging modes, making it highly adaptable. At the same time, when the detector receives signals and images in different modes, the reciprocating motion in the vertical direction facilitates the acquisition of a larger area, fully ensuring the imaging acquisition effect.

[0028] 3. When the frame motor drives the frame screw to rotate, the entire movable frame and the frame guide rail slide together along the x-axis under the limiting action of the frame fixing block, thereby realizing the synchronous off-axis adjustment of the source component and the detector component as a whole, which is convenient, stable, and facilitates the precise adjustment required for the side position mode. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application.

[0030] Figure 2 This is a schematic diagram of the internal structure of the movable frame in Embodiment 1 of this application.

[0031] Figure 3 yes Figure 1 A magnified view of part A in the diagram.

[0032] Figure 4 This is a schematic diagram of the overall structure from another perspective in Embodiment 1 of this application.

[0033] Figure 5 This is a schematic diagram of the overall structure of Embodiment 2 of this application.

[0034] Explanation of reference numerals in the attached figures: 1. Frame body; 101. Frame fixing plate; 102. Movable frame; 2. Alignment slot; 3. Frame motor; 4. Frame lead screw; 5. Frame guide rail; 6. Frame fixing block; 7. Frame slider; 8. Source frame; 9. Source body; 10. Rotating mounting plate; 11. Rotation adjustment slot; 12. Adjusting bolt; 13. Detector motor; 14. Detector lead screw; 15. Detector slider; 16. Detector drive wheel; 17. Detector driven wheel; 18. Detector synchronization. 19. Detector body; 20. Detector mounting frame; 201. First frame; 202. Second frame; 21. First motor; 22. First lead screw; 23. Vertical slide rail; 24. Vertical slider; 25. Horizontal motor; 26. Horizontal lead screw; 27. Horizontal guide rod; 28. Horizontal slider; 29. ​​Fixed rack; 30. Driven rack; 31. Connecting frame; 32. Rotating gear; 33. Frame slide rail; 34. Driven limit rod; 35. Counterweight. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0036] This application discloses a dental CBCT rotating gantry capable of off-axis scanning. Example 1

[0037] Reference Figure 1 and Figure 2 The dental CBCT rotating gantry capable of off-axis scanning includes a gantry body 1, a radiation source assembly, and a detector assembly. The gantry body 1 includes a gantry fixing plate 101, a movable frame 102, and a frame movement assembly. The gantry fixing plate 101 is coaxially fixed to the rotation axis of the rotating gantry (not shown in the figure) so that the gantry fixing plate 101 rotates around its own axis together with the rotation axis of the rotating gantry. In this embodiment, the gantry fixing plate 101 is rectangular. Let the length direction of the gantry fixing plate 101 be the x-axis direction and the width direction be the y-axis direction.

[0038] Continue to refer to Figure 1 and Figure 2 The movable frame 102 slides along the x-axis and is fitted to the frame fixing plate 101. The frame motion assembly is used to drive the movable frame 102 to move along the x-axis. Specifically, the top of the movable frame 102 is provided with a through groove 2 that extends along the x-axis, so that when the movable frame 102 moves along the x-axis, the rotation axis of the rotating frame is always located in the groove 2, thereby making it difficult for the movable frame 102 to interfere with the rotation axis of the rotating frame.

[0039] Continue to refer to Figure 1 and Figure 2The frame movement assembly includes a frame motor 3, a frame lead screw 4, frame guide rails 5, and frame fixing blocks 6. The frame lead screw 4 is mounted rotatably on the movable frame 102 along the x-axis. A frame slider 7 is integrally fixedly connected to one side of the frame fixing plate 101 along the y-axis. The frame lead screw 4 passes through and is threaded into the frame slider 7. The frame motor 3 is mounted on the movable frame 102 and drives the frame lead screw 4 to rotate. Two frame guide rails 5 are distributed along the y-axis, both of which are mounted and fixedly installed on the movable frame 102 along the x-axis. Two sets of frame fixing blocks 6 are distributed along the y-axis, with two blocks in each set. Each frame fixing block 6 is fixedly installed on the frame fixing plate 101. The two frame guide rails 5 pass through and slide into the two sets of frame fixing blocks 6 to ensure the stability of the movable frame 102 during movement along the x-axis.

[0040] Reference Figure 1 and Figure 3 The source component and the detector component are both located at the bottom of the movable frame 102 and on both sides of the movable frame 102 in the x-axis direction. Specifically, the source component includes a source frame 8 and a source body 9 mounted on the source frame 8. A horizontally arranged rotating mounting plate 10 is fixedly installed on the top of the source frame 8. The rotating mounting plate 10 has a circular cross-section. The top of the rotating mounting plate 10 has a plurality of rotating adjustment slots 11 that are evenly distributed around its own axis and pass through it. In this embodiment, there are four rotating adjustment slots 11. Each rotating adjustment slot 11 is arc-shaped and is provided with an adjusting bolt 12 that passes through itself and is threadedly engaged with the movable frame 102, so as to realize the fixation between the rotating mounting plate 10, i.e., the source component, and the movable frame 102.

[0041] Continue to refer to Figure 1 and Figure 3 The source body 9 is used to emit rays. Tightening the adjusting bolt 12 and rotating the rotating mounting plate 10 facilitates the fine adjustment of the circumferential angle of the source body 9 around the vertical direction, which is beneficial for the precise calibration of the beam output direction of the ray source, ensuring that the emission axis is vertically aligned with the final receiving plane, and effectively solving the problem of optical path deviation caused by processing errors or assembly tolerances.

[0042] Reference Figure 2 and Figure 4The movable frame 102 is equipped with a detection motion assembly that drives the detector assembly to move along the x-axis. Specifically, the detection motion assembly includes a detection motor 13, a detection lead screw 14, and a detection slider 15. The detection lead screw 14 is mounted on the movable frame 102 along the x-axis and is threaded onto the detection slider 15. The detection slider 15 slides along the x-axis and is mounted on the movable frame 102. The detection motor 13 is mounted on the movable frame 102. A detection drive wheel 16 is fixedly mounted on the output end of the detection motor 13. A detection driven wheel 17 is coaxially fixedly connected to the detection lead screw 14. A detection timing belt 18 is wound between the detection drive wheel 16 and the detection driven wheel 17, so that the detection motor 13 drives the detection lead screw 14 to rotate through the detection drive wheel 16, the detection timing belt 18, and the detection driven wheel 17, thereby realizing the sliding of the detection slider 15 along the x-axis.

[0043] Reference Figure 4 The detector assembly is mounted on the detector slider 15 so that it slides along the x-axis towards or away from the source assembly. Specifically, the detector assembly includes a detector body 19, a detector mounting frame 20, and a detector motion assembly. The detector mounting frame 20 includes a first frame 201 and a second frame 202. The first frame 201 is fixedly mounted to the detector slider 15 by bolts, and the detector body 19 is mounted on the second frame 202. The detector motion assembly is mounted on the detector mounting frame 20 and drives the first frame 201 to move vertically. This allows the detector body 19 to flexibly adapt to the needs of different imaging modes, enhancing its applicability. Simultaneously, when the detector body 19 receives signals for imaging in different modes, it can achieve a wider range of acquisition through vertical reciprocating motion, which helps ensure the imaging acquisition effect.

[0044] Continue to refer to Figure 4 Furthermore, the detection motion assembly includes a first motor 21 and a first lead screw 22. The first frame 201 has a vertical groove 23 that runs horizontally through the x-axis and extends vertically. A vertical slider 24 is fixedly installed on the side of the second frame 202 away from the source assembly. The vertical slider 24 slides within the vertical groove 23. The first lead screw 22 is vertically positioned and rotatably mounted on the first frame 201. The first lead screw 22 passes through and is threaded into the vertical slider 24. The first motor 21 is mounted on the first frame 201 and drives the first lead screw 22 to rotate. When the first motor 21 drives the first lead screw 22 to rotate, the vertical slider 24 causes the first frame 201 and the detector body 19 to move vertically, facilitating stability and enabling precise adjustment of the vertical position of the second frame 202.

[0045] The implementation principle of Example 1 is as follows: When the patient's head is fixed in the middle position of the rotating gantry for CT mode and panoramic mode imaging, the relative position of the movable frame 102 and the gantry fixing plate 101 remains unchanged. The detector assembly is driven by the probe motor 13 to move along the x-axis towards or away from the patient's head. When lateral mode imaging is required, the detector assembly is first positioned away from the source assembly along the x-axis. Then, the movable frame 102 is driven by the frame motor 3 to move along the x-axis to adjust the distance between the source assembly and the patient's head. Thus, accurate imaging of three modes can be completed without the patient being positioned in a fixed position. This is convenient, fast, and has high examination efficiency. The patient's position remains unchanged, which helps to ensure the spatial consistency and imaging stability of multi-mode imaging. Example 2

[0046] Reference Figure 5 The difference between this embodiment and Embodiment 1 is that the second frame 202 in this embodiment is further provided with a horizontal motion component, which includes a horizontal motor 25, a horizontal lead screw 26, a horizontal guide rod 27, and a horizontal slider 28. The horizontal lead screw 26 and the horizontal guide rod 27 are both arranged along the y-axis direction. The horizontal lead screw is rotatably installed on the second frame 202, and the horizontal guide rod 27 is fixedly installed on the second frame 202. There are two horizontal sliders 28, both of which are fixedly installed on the detector body 19. The horizontal lead screw 26 passes through and is threaded into one of the horizontal sliders 28, and the horizontal guide rod 27 passes through and slides into the other horizontal slider 28. The horizontal motor 25 is installed on the second frame 202 and is used to drive the horizontal lead screw 26 to rotate.

[0047] When the horizontal motor 25 drives the horizontal lead screw to rotate, the two horizontal sliders 28 drive the detector body 19 to move along the y-axis direction. This allows the detector body 19 to perform not only vertical position adjustment but also y-axis position calibration adjustment according to scanning requirements during the imaging process, which further enhances its applicability.

[0048] Continue to refer to Figure 5 In addition, in this embodiment, a fixed rack 29 arranged along the x-axis is fixedly installed on the top of the movable frame 102, and a driven rack 30 is slidably fitted on the top of the movable frame 102 along the x-axis. A connecting frame 31 is fixedly installed on the top of the frame fixing plate 101. The longitudinal section of the connecting frame 31 is L-shaped. A rotating gear 32 is rotatably installed at the bottom of the horizontal section of the connecting frame 31. The rotating gear 32 is located between the fixed rack 29 and the driven rack 30 and meshes with the fixed rack 29 and the driven rack 30, so that when the movable frame 102 moves along the x-axis toward or away from the frame fixing plate 101, the driven rack 30 moves in the opposite direction along the x-axis through the cooperation of the rotating gear 32 and the fixed rack 29.

[0049] To ensure the stability of the driven rack 30's movement along the x-axis, a frame slide rail 33 extending along the x-axis is fixedly installed on the top of the movable frame 102. The frame slide rail 33 passes through and slides into the driven rack 30 to limit its movement. A driven limit rod 34 is fixedly connected to the end of the driven rack 30 near the source assembly to prevent the driven rack 30 from easily falling off during movement.

[0050] Continue to refer to Figure 5 Two fixed racks 29, driven racks 30, connecting brackets 31, and rotating gears 32 are distributed along the y-axis. A counterweight 35 is provided between the two driven racks 30. Specifically, the counterweight 35 is located at the free end of the driven rack 30 away from the source component and is distributed along the x-axis. The two ends of each counterweight 35 are fixedly installed on the two driven racks 30 by bolts that pass through themselves and are threaded into the driven rack 30, so as to realize the adjustment of the counterweight mass.

[0051] When the movable frame 102 moves along the x-axis toward or away from the frame fixing plate 101, the driven rack 30 drives the counterweight 35 to move in the opposite direction along the x-axis through the cooperation of the rotating gear 32 and the fixed rack 29. This facilitates the dynamic balance of torque of the movable frame 102 during off-axis movement, thereby helping to eliminate vibration and off-axis load caused by the mass eccentricity of the movable frame 102. This ensures that the equipment maintains relatively stable accuracy and stability under long-term high-frequency off-axis scanning, and extends the service life of the equipment.

[0052] The implementation principle of this embodiment is the same as that of Embodiment 1, and will not be repeated here.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A dental CBCT rotating gantry capable of off-axis scanning, comprising a gantry body (1), a source assembly and a detector assembly, characterized in that: The rack body (1) comprises a rack fixing plate (101), a movable rack body (102) and a rack body movement assembly, the rack fixing plate (101) is fixedly installed on the rotating shaft of the rotating rack, the movable rack body (102) is slidingly matched with the rack fixing plate (101), and the rack body movement assembly is used for driving the movable rack body (102) to move along the x-axis. The radiation source assembly and the detector assembly are respectively close to two sides of the movable rack body (102) in the x-axis direction, and the movable rack body (102) is provided with a detection movement assembly for driving the detector assembly to move along the x-axis.

2. The dental CBCT rotating gantry capable of off-axis scanning according to claim 1, wherein: The detection movement assembly comprises a detection motor (13), a detection lead screw (14) and a detection sliding block (15), the detection lead screw (14) is arranged along the x-axis and is rotatably installed on the movable rack body (102), the detection lead screw (14) penetrates and is threadedly matched with the detection sliding block (15), the detection sliding block (15) is slidingly matched with the movable rack body (102) along the x-axis, and the detection motor (13) is used for driving the detection lead screw (14) to rotate.

3. The dental CBCT rotating gantry capable of off-axis scanning according to claim 2, wherein: The output end of the detection motor (13) is fixedly installed with a detection driving wheel (16), the detection lead screw (14) is coaxially fixedly connected with a detection driven wheel (17), and the detection driving wheel (16) and the detection driven wheel (17) are provided with a detection synchronous belt (18) therearound.

4. The dental CBCT rotating gantry capable of off-axis scanning according to claim 2, wherein: The detector assembly comprises a detector body (19), a detection mounting rack (20) and a detection movement assembly, the detection mounting rack (20) comprises a first rack body (201) and a second rack body (202), the first rack body (201) is installed on the detection sliding block (15), the detector body (19) is installed on the second rack body (202), and the detection movement assembly is arranged on the detection mounting rack (20) and is used for driving the first rack body (201) to move along the vertical direction.

5. The dental CBCT rotating gantry capable of off-axis scanning according to claim 4, wherein: The detection movement assembly comprises a first motor (21) and a first lead screw (22), the first rack body (201) is provided with a vertical sliding groove (23) extending along the vertical direction, the second rack body (202) is fixedly installed with a vertical sliding block (24), the vertical sliding block (24) is slidingly matched in the vertical sliding groove (23), the first lead screw (22) is arranged along the vertical direction and is rotatably installed on the first rack body (201), the first lead screw (22) penetrates and is threadedly matched with the vertical sliding block (24), and the first motor (21) is used for driving the first lead screw (22) to rotate.

6. The dental CBCT rotating gantry capable of off-axis scanning according to claim 5, wherein: The second frame body (202) is provided with a horizontal movement assembly, the horizontal movement assembly comprises a horizontal motor (25), a horizontal lead screw (26), a horizontal guide rod (27) and a horizontal sliding block (28), the horizontal lead screw (26) and the horizontal guide rod (27) are both arranged along the y-axis direction, the horizontal lead screw is rotatably installed on the second frame body (202), the horizontal guide rod (27) is fixedly installed on the second frame body (202), the horizontal sliding block (28) is provided with two and is fixedly installed on the detector body (19), the horizontal lead screw (26) is threaded and matched in one of the horizontal sliding blocks (28), the horizontal guide rod (27) is threaded and matched in the other horizontal sliding block (28), and the horizontal motor (25) is used for driving the horizontal lead screw (26) to rotate.

7. The dental CBCT rotating gantry capable of off-axis scanning according to claim 1, wherein: The frame body movement assembly comprises a frame body motor (3), a frame body lead screw (4), a frame body guide rail (5) and a frame body fixed block (6), the frame body lead screw (4) is arranged along the x-axis direction and is rotatably installed on the movable frame body (102), the frame body lead screw (4) is threaded and matched in the rack fixed plate (101), and the frame body motor (3) is used for driving the frame body lead screw (4) to rotate; the frame body guide rail (5) is arranged along the x-axis direction and is fixedly installed on the movable frame body (102), and the frame body fixed block (6) is fixedly installed on the rack fixed plate (101), the frame body guide rail (5) is threaded and matched in the frame body fixed block (6).

8. The dental CBCT rotating gantry capable of off-axis scanning according to claim 7, wherein: The movable frame body (102) is fixedly installed on the top along the x-axis direction The fixed rack (29) is slidably matched with the driven rack (30) on the top of the movable frame body (102) along the x-axis direction, the driven rack (30) is installed with the counterweight (35), the rack fixed plate (101) is fixedly installed with the connecting frame (31), the connecting frame (31) is rotatably installed with the rotating gear (32), and the rotating gear (32) is located between the fixed rack (29) and the driven rack (30) and is engaged with the fixed rack (29) and the driven rack (30).

9. The dental CBCT rotating gantry capable of off-axis scanning according to claim 8, wherein: The fixed rack (29), the driven rack (30), the connecting frame (31) and the rotating gear (32) are all distributed along the y-axis direction Two, the counterweight (35) is distributed along the x-axis direction Multiple, both ends of each counterweight (35) are fixedly installed on two driven racks (30) through bolts.

10. The dental CBCT rotating gantry capable of off-axis scanning according to claim 1, wherein: The source assembly comprises a source frame body (8) and a source body (9) installed on the source frame body (8), the source frame body (8) is fixedly installed with a rotating installation plate (10), the rotating installation plate (10) is provided with a plurality of rotating adjustment grooves (11) distributed circumferentially around the axis thereof, and each rotating adjustment groove (11) is provided with an adjustment bolt (12) threaded and matched in the rotating adjustment groove (11) and matched with the movable frame body (102).

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