CT equipment lateral head clamp, geometric calibration method and oral CT

Abstract

The present application provides a lateral head clamp for CT equipment, a geometric calibration method, and an oral CT, which relates to the field of oral CT technology, including a base, a head support, and a clamping assembly. A support column is provided on the top of the base, and the head support is provided on the top of the support column to support the patient's jaw so as to fix the patient's head from the bottom up. The clamping assembly is provided at the two side edges of the top of the head support to clamp and fix the two sides of the patient's face. The present application can support the patient's mandible by providing a head support, and can clamp and fix the supported head by providing a clamping assembly, so that the patient's head can be supported and fixed from the bottom up. Therefore, the patient does not need to stand and move, which not only improves the patient's comfort, but also can fix the head more stably, avoids image blurring due to slight shaking of the head during scanning, and improves the shooting quality.

Description

Technical Field

[0001] The present invention relates to the technical field of oral CT, and in particular to a lateral head clamp of CT equipment, a geometric calibration method and an oral CT. Background Art

[0002] Imaging technologies, including X-rays and computed tomography (CT), have been widely used in numerous fields since their introduction, particularly in medical examinations. Oral CT provides a three-dimensional view of tissue conditions, revealing subtle or even subtle lesions that are not visible on dental X-rays.

[0003] Existing CT equipment often requires the patient to be moved to different positions when performing CT and anteroposterior views, requiring the head clamp to be installed in different locations. Traditionally, the head clamp is installed from the top down, on the top of the device with the opening facing downward. This design requires the patient to stand still while the head clamp clamps the patient's head from top to bottom, which can cause fatigue or even slight head movement, affecting the CT scan. Summary of the Invention

[0004] The purpose of the present invention is to address the problem that the existing lateral head clamp of CT equipment cannot support and fix the patient's head from bottom to top, so the patient's head is prone to shaking and affecting CT imaging.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The lateral head clamp of the CT device includes a base and also includes:

[0007] A head support, wherein a support column is provided on the top of the base, and the head support is provided on the top of the support column, and is used to support the patient's jaw to fix the patient's head from bottom to top;

[0008] The clamping components are arranged at the edges of both sides of the top of the head support and are used to clamp and fix both sides of the patient's face.

[0009] As a preferred technical solution of the present application, the head support includes a mounting plate arranged on the top of the support column and a jaw support plate arranged on the side wall of the mounting plate, a mounting column is provided on the side of the jaw support plate facing the mounting plate, and a mounting hole matching the mounting column is opened on the side of the mounting plate facing the jaw support plate, wherein a locking assembly is provided between the support column and the mounting plate.

[0010] As a preferred technical solution of the present application, the clamping assembly includes clamping arms movably arranged on both sides of the jaw support plate, the clamping end of one clamping arm is provided with a steel ball, and the clamping end of the other clamping arm is provided with a steel ring corresponding to the steel ball, wherein an adjustment assembly is provided between the clamping arm and the jaw support plate.

[0011] As the preferred technical solution of this application, the adjustment assembly includes a waist hole opened on the inner side of the clamp arm near the bottom, connecting columns arranged on both sides of the jaw support plate, an adjustment block arranged at the end of the connecting column away from the jaw support plate and matched with the waist hole, and a screw sleeve with a thread arranged on the outside of the connecting column and against the inner wall of the clamp arm.

[0012] As the preferred technical solution of this application, the locking assembly includes a positioning plate arranged on the top of the support column, a number of positioning holes symmetrically arranged on the surface of the positioning plate and the bottom of the mounting plate, and positioning bolts threadedly arranged in the positioning holes, wherein the positioning holes are arc-shaped structures.

[0013] As a preferred technical solution of the present application, two columns are provided on the top of the mounting plate, a forehead stop is slidably connected between the two columns, and clamping pads are movably connected on both sides of the forehead stop.

[0014] The present invention also discloses a geometric calibration method for a lateral head clamp of a CT device, comprising the following steps:

[0015] S1: empty shot of lateral head clamp;

[0016] S2: A lateral radiograph is taken, where the radiation source passes through a steel ball in one clamp arm and a steel ring in the other clamp arm, and the signal is then received by the detector.

[0017] S3: Check whether the image formed by the steel ball in the detector is inside the steel ring.

[0018] As a preferred technical solution of the present application, when it is detected in step S3 that the image formed by the steel ball in the detector is inside the steel ring, the calibration of the head clamp is completed.

[0019] As a preferred technical solution of the present application, when it is detected in step S3 that the image of the steel ball formed in the detector is offset up and down relative to the steel ring, the following steps are performed:

[0020] S31: Loosen the nut, slowly move the clamping arms on both sides of the jaw support plate up and down, adjust the relative position of the steel ball and the steel ring so that the steel ball and the steel ring are horizontally aligned, and then perform steps S1, S2, and S3 until it is detected that the image formed by the steel ball in the detector is inside the steel ring.

[0021] As a preferred technical solution of the present application, when it is detected in step S3 that the image of the steel ball formed in the detector is offset left and right relative to the steel ring, the following steps are performed:

[0022] S32: Turn the positioning bolts to loosen the mounting plate and the positioning plate, and then slightly turn the mounting plate to drive the jaw support plate to rotate left and right, so as to fine-tune the relative positions of the steel balls and steel rings in the two clamping arms so that the steel balls and steel rings are aligned, and then proceed to steps S1, S2, and S3 until it is detected that the image formed by the steel ball in the detector is inside the steel ring.

[0023] The present invention also discloses an oral CT, comprising the above-mentioned lateral head clamp of the CT equipment, a seat arranged on the top of the base, a radiation source arranged on one side of the top of the base, and a detector arranged on the other side of the top of the base.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. When the patient needs to undergo an oral CT scan, he or she first sits on the chair and then puts his or her chin on the jaw rest. The jaw rest supports the patient's head, and then the clamping arms arranged on both sides of the jaw rest can clamp and fix the patient's head, thereby completing the support and fixation of the patient's head from bottom to top. By splitting the head clamp into two clamping arms and using them in conjunction with the jaw rest, the adjustment process is made more flexible and convenient, which solves the problem in the prior art that the patient needs to stand still and fix the patient's head from top to bottom by the head clamp on the top of the CT device, causing discomfort to the patient and affecting the shooting due to slight shaking of the head. Therefore, the lateral head clamp of the present application can improve the patient's comfort and the stability of head fixation, and avoid image blurring due to slight shaking of the head during the scanning process.

[0026] 2. Before supporting and fixing the patient's head, the position of the head clamp needs to be calibrated. First, take an aerial photo of the lateral head clamp to allow the radiation source to pass through the steel ball and steel ring in the clamp arm. The signal is then received by the detector. The image formed by the steel ball in the detector is then detected to see if it is inside the steel ring. If the image formed by the steel ball in the detector is exactly inside the steel ring, the position of the head clamp is accurate. When the image formed by the steel ball in the detector is offset up or down relative to the steel ring, the adjustment component can be used to fine-tune the up and down positions of the two clamp arms to align the steel ball and the steel ring. When the image formed by the steel ball in the detector is offset left or right relative to the steel ring, the locking component is used to loosen the mounting plate, and then the mounting plate is slightly moved left or right to fine-tune the left and right positions of the two clamp arms to align the steel ball and the steel ring. Finally, take another aerial photo to continue detecting whether the image formed by the steel ball in the detector is inside the steel ring. The above operations are repeated until the image formed by the steel ball in the detector is accurately inside the steel ring. This facilitates the rapid calibration of the head clamp position in the CT equipment, ensuring the accuracy of the equipment and the quality of the imaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is the overall structural diagram of the present invention;

[0028] Figure 2 This is one of the chuck structure diagrams of the present invention;

[0029] Figure 3 This is the second structural diagram of the chuck of the present invention;

[0030] Figure 4 This is a structural diagram of the clamping assembly of the present invention;

[0031] Figure 5 This is a structural diagram of the clamping arm of the present invention;

[0032] Figure 6 This is a structural diagram of the head support member of the present invention;

[0033] Figure 7 This is a bottom view of the mounting plate of the present invention;

[0034] Figure 8 This is a structural diagram of the locking assembly of the present invention.

[0035] The accompanying drawings are:

[0036] 10. Base; 110. Support column; 120. Seat; 20. Mounting plate; 210. Mounting hole; 30. Jaw support plate; 310. Mounting column; 320. Connecting column; 330. Adjustment block; 340. Screw sleeve; 40. Clamp arm; 410. Steel ball; 420. Steel ring; 50. Waist hole; 60. Positioning plate; 610. Positioning hole; 620. Positioning bolt; 70. Column; 80. Forehead guard; 810. Clamp pad. DETAILED DESCRIPTION

[0037] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0038] like Figures 1 to 8As shown, this embodiment proposes a lateral head clamp for CT equipment, including a base 10, a head support and a clamping assembly. A support column 110 is provided on the top of the base 10. The head support is provided on the top of the support column 110 and is used to support the patient's jaw to fix the patient's head from bottom to top. The clamping assemblies are provided at the two side edges of the top of the head support and are used to clamp and fix the two sides of the patient's face. When the patient needs to undergo oral CT scanning, he first sits on the CT equipment, and then the patient's lower jaw is supported by the provided head support, and then the two sides of the patient's face are clamped and fixed by the provided clamping assemblies, so that the patient's head can be supported and fixed from bottom to top. Therefore, the patient does not need to stand up, which not only improves the patient's comfort, but also can fix the head more stably, avoids image blurring caused by slight shaking of the head during the scanning process, and improves the shooting quality. In addition, this equipment has three shooting modes, namely CT mode, panoramic mode and anteroposterior mode. These three modes are achieved through a single optical path design, thereby ensuring the compactness and functional diversity of the equipment.

[0039] Specifically, the head support includes a mounting plate 20 and a jaw support plate 30. The mounting plate 20 is arranged on the top of the support column 110, and the jaw support plate 30 is arranged on the side wall of the mounting plate 20. A mounting column 310 is provided on the side of the jaw support plate 30 facing the mounting plate 20. A mounting hole 210 is opened on the side of the mounting plate 20 facing the jaw support plate 30, and the mounting hole 210 cooperates with the mounting column 310, wherein a locking assembly is provided between the support column 110 and the mounting plate 20; by inserting the mounting column 310 into the mounting hole 210 on the mounting plate 20, the jaw support plate 30 and the mounting plate 20 can be quickly installed. During testing, the patient can place his lower jaw on the top of the jaw support plate 30, thereby supporting the patient's head, which not only facilitates stable clamping of the head, but also saves physical strength.

[0040] The clamping assembly includes two clamping arms 40, which are movably arranged on both sides of the jaw support plate 30, and a steel ball 410 is provided at the clamping end of one clamping arm 40, and a steel ring 420 corresponding to the steel ball 410 is provided at the clamping end of the other clamping arm 40, wherein an adjustment assembly is provided between the clamping arm 40 and the jaw support plate 30; when the patient's head is supported by the jaw support plate 30, the two clamping arms 40 set separately can be used in conjunction with the jaw support plate 30, so that the clamping arms 40 are inserted into the patient's ear holes away from the ends of the jaw support plate 30, and then the patient's head can be clamped and fixed, which is convenient for subsequent stable filming and examination of the patient. The steel balls 410 and steel rings 420 are set to detect whether the two clamping arms 40 are in the same horizontal line with the radiation source and the detector. Specifically, through the aerial lateral head clamp, the radiation source passes through the steel balls 410 and the steel rings 420 and the signal is received by the detector, and then it is detected whether the image formed by the steel balls 410 in the detector is inside the steel rings 420.

[0041] It should be noted that, in order to facilitate the rapid calibration of the lateral head clamp, an adjustment component and a locking component for auxiliary calibration can be set on the head clamp, the adjustment component includes a connecting column 320, an adjustment block 330 and a screw sleeve 340, wherein the two clamping arms 40 are provided with waist holes 50 on the opposite sides, and connecting columns 320 are provided on both sides of the jaw support plate 30. The end of the connecting column 320 away from the jaw support plate 30 is provided with an adjustment block 330 that matches the waist hole 50, and the external thread of the connecting column 320 is connected to the screw sleeve 340 that abuts against the inner wall of the clamping arm 40; when calibrating the position of the head clamping device, if it is detected that the steel ball 410 is shaped in the detector, If the image is offset up and down relative to the steel ring 420, you can loosen the screw sleeve 340, slowly move the clamping arms 40 on both sides of the jaw support plate 30 up and down, adjust the relative position of the steel ball 410 and the steel ring 420, so that the steel ball 410 and the steel ring 420 are horizontally aligned, and then continue the aerial shooting operation to detect the relative position of the image formed by the steel ball 410 in the detector and the steel ring 420. If the image is exactly in the steel ring 420, the calibration is completed. If the image is still offset up and down relative to the steel ring 420, continue the above calibration steps until it is detected that the image formed by the steel ball 410 in the detector is exactly inside the steel ring 420.

[0042] The locking assembly includes a positioning plate 60 and a positioning bolt 620. The positioning plate 60 is arranged on the top of the support column 110. The surface of the positioning plate 60 and the bottom of the mounting plate 20 are both provided with a plurality of symmetrically arranged positioning holes 610. A plurality of positioning bolts 620 are respectively threadedly connected in each positioning hole 610, wherein the positioning hole 610 is an arc-shaped knot. When calibrating the position of the head clamp device, if it is detected that the image formed by the steel ball 410 in the detector is offset to the left or right relative to the steel ring 420, the positioning bolt 620 can be rotated to loosen the mounting plate 20 and the positioning plate 60. Then slightly rotate the mounting plate 20 to drive the jaw support plate 30 to rotate left and right, so that the relative position of the steel ball 410 and the steel ring 420 in the two clamping arms 40 can be fine-tuned to align the steel ball 410 and the steel ring 420, and then continue the aerial shooting operation to detect the relative position of the image formed by the steel ball 410 in the detector and the steel ring 420. If the image is exactly in the steel ring 420, the calibration is completed. If the image is still offset left and right relative to the steel ring 420, continue the above calibration steps until it is detected that the image formed by the steel ball 410 in the detector is exactly inside the steel ring 420.

[0043] To reiterate, the relative pitch angles between the steel ball 410 and the steel ring 420 in the clamp arm 40 are always at the same horizontal position regardless of how they are adjusted. Therefore, the pitch angles do not affect the imaging positions of the steel ball 410 and the steel ring 420 relative to each other, so no adjustment is required during the above-mentioned geometric calibration process.

[0044] In order to improve the stability of fixing the patient's head, two columns 70 can be set on the top of the mounting plate 20, a forehead block 80 can be slidably connected between the two columns 70, and a clamping pad 810 can be movably connected on both sides of the forehead block 80; after the patient's head is supported and fixed, the patient's forehead can be supported and blocked by the set forehead block 80, and then the two sides of the patient's forehead can be clamped and fixed by the set clamping pad 810, thereby further improving the stability of clamping and fixing the patient's head.

[0045] The present invention also discloses a geometric calibration method for a lateral head clamp of a CT device, comprising the following steps:

[0046] S1: empty shot of lateral head clamp;

[0047] Specifically, before geometric calibration, it is necessary to first perform an air shot using a lateral view in the anteroposterior mode;

[0048] S2: A lateral radiograph is taken, where the radiation source passes through the steel ball 410 in one clamp arm 40 and the steel ring 420 in the other clamp arm 40, and then the signal is received by the detector;

[0049] Specifically, in the lateral view mode, the two clamp arms 40 of the head clamp are parallel to the line connecting the detector and the radiation source. This design facilitates the radiation to pass through the steel ball 410 and the steel ring 420 and then be received by the detector.

[0050] S3: Detect whether the image formed by the steel ball 410 in the detector is inside the steel ring 420;

[0051] Specifically, after the aerial photo is taken, the image is checked continuously. In the image, it is observed that the position of the steel ball 410 needs to be inside the steel ring 420, so as to indicate that the position of the geometric calibration is correct.

[0052] In addition, when detecting the position of the image formed by the steel ball 410 in the detector after the air shot is completed, if it is detected that the image formed by the steel ball 410 in the detector is inside the steel ring 420, the calibration of the head clamp is completed.

[0053] If it is detected that the image of the steel ball 410 formed in the detector is offset up and down relative to the steel ring 420, the following steps are performed:

[0054] S31: Loosen the screw sleeve 340, slowly move the clamping arms 40 on both sides of the jaw support plate 30 up and down, adjust the relative positions of the steel ball 410 and the steel ring 420 so that the steel ball 410 and the steel ring 420 are horizontally aligned, and then perform steps S1, S2, and S3 until it is detected that the image formed by the steel ball 410 in the detector is located inside the steel ring 420.

[0055] When it is detected that the image of the steel ball 410 formed in the detector is offset left or right relative to the steel ring 420, the following steps are performed:

[0056] S32: Turn the positioning bolt 620 to loosen the mounting plate 20 and the positioning plate 60, and then slightly rotate the mounting plate 20 to drive the jaw support plate 30 to rotate left and right, so as to fine-tune the relative positions of the steel balls 410 and the steel rings 420 in the two clamping arms 40 so that the steel balls 410 and the steel rings 420 are aligned, and then perform steps S1, S2, and S3 until it is detected that the image formed by the steel ball 410 in the detector is located inside the steel ring 420.

[0057] The present invention also discloses an oral CT, including the above-mentioned lateral head clamp of the CT equipment, and also includes a seat 120 arranged on the top of the base 10, a radiation source arranged on one side of the top of the base 10, and a detector arranged on the other side of the top of the base 10; when the patient undergoes oral photography and testing, the patient can sit on the seat 120 to support and fix the head, so there is no need to stand still, which not only saves physical energy but also improves the stability of the patient's head, making it easier for the radiation source to emit radiation that accurately passes through the patient's head and is received by the detector to form a captured image.

[0058] The working principle of the present invention is as follows: when a patient needs to undergo an oral CT scan, he or she first sits on the chair 120. The patient can place his or her lower jaw on the top of the jaw support plate 30 to support the patient's head. The two separately provided clamping arms 40 can be used in conjunction with the jaw support plate 30 so that the ends of the clamping arms 40 away from the jaw support plate 30 are inserted into the patient's ear holes, thereby clamping and fixing the patient's head. This supports and fixes the patient's head from the bottom up, so that the patient does not need to stand up. This not only improves the patient's comfort, but also allows for a more stable fixation of the head, thereby avoiding image blurring caused by slight head shaking during the scanning process and improving the quality of the scan. The steel ball 410 and steel ring 420 are provided to detect whether the two clamping arms 40 are at the same horizontal line as the radiation source and the detector. Specifically, the lateral head clamp is used to allow the radiation source to pass through the steel ball 410 and steel ring 420 and be received by the detector. The image formed by the steel ball 410 in the detector is then detected to be inside the steel ring 420. If it is detected that the image formed by the steel ball 410 in the detector is inside the steel ring 420, the calibration of the head clamp is completed. If it is detected that the image formed by the steel ball 410 in the detector is offset up and down relative to the steel ring 420, the screw sleeve 340 can be loosened, and the clamping arms 40 on both sides of the jaw support plate 30 can be slowly moved up and down to adjust the relative positions of the steel ball 410 and the steel ring 420 so that the steel ball 410 and the steel ring 420 are horizontally aligned. Then, the aerial shooting operation is continued to detect the relative positions of the image formed by the steel ball 410 in the detector and the steel ring 420. If the image is exactly inside the steel ring 420, the calibration is completed. If the image is still offset up and down relative to the steel ring 420, the above calibration steps are continued until it is detected that the image formed by the steel ball 410 in the detector is exactly located on the steel ring 420; if it is detected that the image formed by the steel ball 410 in the detector is offset to the left and right relative to the steel ring 420, the positioning bolt 620 can be rotated to loosen the mounting plate 20 and the positioning plate 60, and then the mounting plate 20 can be slightly rotated to drive the jaw support plate 30 to rotate left and right, so that the relative positions of the steel balls 410 and the steel ring 420 in the two clamping arms 40 can be fine-tuned to align the steel balls 410 and the steel ring 420, and then continue the aerial shooting operation to detect the relative positions of the image formed by the steel ball 410 in the detector and the steel ring 420. If the image is exactly in the steel ring 420, the calibration is completed. If the image is still offset to the left and right relative to the steel ring 420, continue the above calibration steps until it is detected that the image formed by the steel ball 410 in the detector is exactly inside the steel ring 420.

[0059] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although this specification has described the present invention in detail with reference to the above embodiments, the present invention is not limited to the above specific implementation methods. Therefore, any modification or equivalent replacement of the present invention; all technical solutions and improvements that do not depart from the spirit and scope of the invention are included in the scope of the claims of the present invention.

Claims

1. A lateral head clamp for a CT device, comprising a base (10), characterized in that: Also includes: A head support member, wherein a support column (110) is provided on the top of the base (10), and the head support member is provided on the top of the support column (110) and is used to support the patient's jaw to achieve upward fixation of the patient's head; The clamping assembly is arranged at the edges of both sides of the top of the head support and is used to clamp and fix both sides of the patient's face. The clamping assembly comprises clamping arms (40) movably arranged on both sides of the jaw support plate (30), a clamping end of one clamping arm (40) is provided with a steel ball (410), and a clamping end of the other clamping arm (40) is provided with a steel ring (420) corresponding to the steel ball (410), wherein an adjustment assembly is provided between the clamping arm (40) and the jaw support plate (30).

2. The lateral head clamp for CT equipment according to claim 1, characterized in that: The head support member comprises a mounting plate (20) arranged on the top of the support column (110) and a jaw support plate (30) arranged on the side wall of the mounting plate (20), wherein a mounting column (310) is provided on the side of the jaw support plate (30) facing the mounting plate (20), and a mounting hole (210) matching the mounting column (310) is opened on the side of the mounting plate (20) facing the jaw support plate (30), wherein a locking assembly is provided between the support column (110) and the mounting plate (20).

3. The lateral head clamp for CT equipment according to claim 1, characterized in that: The adjustment assembly comprises a waist hole (50) provided on the inner side of the clamp arm (40) near the bottom, a connecting column (320) provided on both sides of the jaw support plate (30), an adjustment block (330) provided at one end of the connecting column (320) away from the jaw support plate (30) and matched with the waist hole (50), and a screw sleeve (340) threadedly provided on the outside of the connecting column (320) and abutting against the inner wall of the clamp arm (40).

4. The lateral head clamp for CT equipment according to claim 2, characterized in that: The locking assembly comprises a positioning plate (60) arranged on the top of the support column (110), a plurality of positioning holes (610) symmetrically arranged on the surface of the positioning plate (60) and the bottom of the mounting plate (20), and positioning bolts (620) threadedly arranged in the positioning holes (610), wherein the positioning holes (610) are arc-shaped structures.

5. The lateral head clamp for CT equipment according to claim 2, characterized in that: Two upright posts (70) are provided on the top of the mounting plate (20), a forehead stop (80) is slidably connected between the two upright posts (70), and clamping pads (810) are movably connected on both sides of the forehead stop (80).

6. A method for geometrically calibrating a CT device lateral head clamp using the CT device lateral head clamp according to any one of claims 1 to 5, characterized in that: include: S1: empty shot of lateral head clamp; S2: Through lateral radiographs, the radiation source passes through the steel ball (410) in one clamp arm (40) and the steel ring (420) in the other clamp arm (40), and then the signal is received by the detector; S3: Detect whether the image formed by the steel ball (410) in the detector is inside the steel ring (420).

7. The method according to claim 6, characterized in that When it is detected in step S3 that the image of the steel ball (410) formed in the detector is inside the steel ring (420), the calibration of the head clamp is completed.

8. The method according to claim 6, characterized in that When it is detected in step S3 that the image of the steel ball (410) formed in the detector is offset up and down relative to the steel ring (420), the following steps are performed: S31: Loosen the screw sleeve (340), slowly move the clamping arms (40) on both sides of the jaw support plate (30) up and down, adjust the relative positions of the steel ball (410) and the steel ring (420) so that the steel ball (410) and the steel ring (420) are horizontally aligned, and then perform steps S1, S2, and S3 until it is detected that the image formed by the steel ball (410) in the detector is located inside the steel ring (420).

9. The method according to claim 6, characterized in that When it is detected in step S3 that the image of the steel ball (410) formed in the detector is offset to the left and right relative to the steel ring (420), the following steps are performed: S32: Turn the positioning bolt (620) to loosen the mounting plate (20) and the positioning plate (60), and then slightly turn the mounting plate (20) to drive the jaw support plate (30) to rotate left and right, thereby fine-tuning the relative positions of the steel balls (410) and the steel ring (420) in the two clamping arms (40) so that the steel balls (410) and the steel ring (420) are aligned, and then perform steps S1, S2, and S3 until it is detected that the image formed by the steel ball (410) in the detector is located inside the steel ring (420).

10. An oral CT device, comprising the lateral head clamp of any one of claims 1 to 5, characterized in that: It also includes a seat (120) arranged on the top of the base (10), a radiation source arranged on one side of the top of the base (10), and a detector arranged on the other side of the top of the base (10).

Images