CT equipment side position head clamp, geometric calibration method and oral cavity CT

Abstract

The invention provides a CT equipment side position head clamp, a geometric calibration method and an oral cavity CT, and relates to the technical field of oral cavity CT. The CT equipment side position head clamp comprises a base and further comprises a head supporting piece and a clamping assembly, a supporting column is arranged at the top of the base, and the head supporting piece is arranged at the top of the supporting column and used for supporting the jaw of a patient to fix the head of the patient from bottom to top; the clamping assemblies are arranged on the edges of the two sides of the top of the head supporting piece and used for clamping and fixing the two sides of the face of the patient. The lower jaw of a patient can be supported through the arranged head supporting piece, the supported head can be clamped and fixed through the arranged clamping assembly, and therefore the head of the patient can be supported and fixed from bottom to top, the patient does not need to stand, the comfort level of the patient can be improved, and the patient can feel comfortable. And the head can be more stably fixed, image blurring caused by slight shaking of the head in the scanning process is avoided, and the shooting quality is improved.

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 technology, including X-ray imaging, CT (Computed Tomography), etc., has been widely used in many fields since its introduction, especially in the field of medical examination. Oral CT can reflect the tissue condition from a three-dimensional perspective and can detect lesions that cannot be detected by the projection angle of oral X-rays or are more subtle.

[0003] When existing CT equipment is used for CT mode and anteroposterior mode imaging, the patient usually needs to be moved to different positions, so the installation position of the head clamp is also different. The traditional head clamp is installed from top to bottom, installed on the top of the device, with the opening of the clamp facing downward. Therefore, this design requires the patient to stand still and the head clamp is clamped from top to bottom, which may cause the patient to be tired or the head to shake slightly, affecting the CT imaging. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the lateral head clamp of the existing 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 shooting.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions: The lateral head clamp of the CT device includes a base and also includes: A head support, wherein a support column is disposed on the top of the base, and the head support is disposed 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; 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.

[0006] As a preferred technical solution of the present application, the head support comprises 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, 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.

[0007] 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 of the clamping arms 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.

[0008] As a preferred technical solution of the present 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 threadedly arranged on the outside of the connecting column and abutting against the inner wall of the clamp arm.

[0009] As a preferred technical solution of the present application, the locking assembly includes a positioning plate arranged on the top of the support column, 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.

[0010] 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.

[0011] The present invention also discloses a geometric calibration method for a lateral head clamp of a CT device, comprising the following steps: S1: empty shot of lateral head clamp; S2: Through the lateral view, the radiation source passes through the steel ball in one clamp arm and the steel ring in the other clamp arm, and then the signal is received by the detector; S3: Check whether the image formed by the steel ball in the detector is inside the steel ring.

[0012] 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.

[0013] 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 offset up and down relative to the steel ring, the following steps are performed: S31: Loosen the screw sleeve, 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 located inside the steel ring.

[0014] 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 offset left and right relative to the steel ring, the following steps are performed: 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 clamp arms to align the steel balls and steel rings, and then perform steps S1, S2, and S3 until it is detected that the image formed by the steel balls in the detector is inside the steel ring.

[0015] 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.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. When the patient needs to undergo an oral CT scan, the patient first sits on the chair and then places his 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 clamp the patient's head to fix it, thereby supporting and fixing 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 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 blur due to slight shaking of the head during the scanning process.

[0017] 2. Before supporting and fixing the patient's head, the position of the head clamp needs to be calibrated. First, take an empty shot of the lateral head clamp to allow the radiation source to pass through the steel ball and steel ring in the clamp arm, and then the signal is received by the detector. Then, it is detected whether the image formed by the steel ball in the detector is inside the steel ring. If the image formed by the steel ball in the detector is just inside the steel ring, it means that the position of the head clamp is in an accurate state. When the image formed by the steel ball in the detector is offset up and down relative to the steel ring, the upper and lower positions of the two clamp arms can be fine-tuned up and down through the set adjustment component to align the steel ball and the steel ring. When the image formed by the steel ball in the detector is offset left and right relative to the steel ring, the mounting plate is loosened through the locking component, and then the mounting plate is slightly moved left and 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 an empty shot again to continue to detect whether the image formed by the steel ball in the detector is inside the steel ring. The above operations are repeated in sequence until the image formed by the steel ball in the detector is accurately located inside the steel ring, thereby facilitating the rapid calibration of the head clamp position in the CT device and ensuring the accuracy and shooting quality of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the overall structure diagram of the present invention; Figure 2 One of the chuck structure diagrams of the present invention; Figure 3 This is the second structural diagram of the chuck of the present invention; Figure 4 It is a structural diagram of the clamping assembly of the present invention; Figure 5 It is a structural diagram of the clamp arm of the present invention; Figure 6 It is a structural diagram of the head support of the present invention; Figure 7 It is a bottom view of the structure of the mounting plate of the present invention; Figure 8 It is a structural diagram of the locking assembly of the present invention.

[0019] The accompanying drawings are marked as follows: 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 stop; 810. Clamp pad. DETAILED DESCRIPTION

[0020] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0021] like Figures 1 to 8 As shown, the present embodiment proposes a lateral head clamp for a CT device, comprising a base 10, a head support and a clamping assembly. A support column 110 is arranged on the top of the base 10. The head support is arranged on the top of the support column 110, and is used to support the patient's jaw so as to fix the patient's head from bottom to top. The clamping assembly is arranged at the two side edges of the top of the head support, and is 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 device, and then supports the patient's lower jaw by the arranged head support, and then clamps and fixes the two sides of the patient's face by the arranged clamping assembly, so that the patient's head can be supported and fixed from bottom to top. Therefore, the patient does not need to stand and move, which can not only improve the patient's comfort, but also fix the head more stably, avoid image blurring due to slight shaking of the head during scanning, and improve the shooting quality. In addition, the present device is divided into three shooting modes, namely CT mode, panoramic mode and frontal and lateral mode. These three modes are realized by a single optical path design, thereby ensuring the compactness and functional diversity of the device.

[0022] 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, 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 and the mounting column 310 cooperate with each other, wherein a locking assembly is provided between the support column 110 and the mounting plate 20; by arranging the mounting column 310 to be inserted into the mounting hole 210 on the mounting plate 20, the jaw support plate 30 and the mounting plate 20 can be quickly installed, and during testing, the patient can place the lower jaw on the top of the jaw support plate 30, so as to support the patient's head, which is not only convenient for stable clamping of the head, but also can save physical strength.

[0023] The clamping assembly includes two clamping arms 40, which are movably arranged on both sides of the jaw support plate 30, respectively. 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 which are separately arranged 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 ear holes of the patient, 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 arranged to detect whether the two clamping arms 40 are in the same horizontal line with the radiation source and the detector. Specifically, the radiation source passes through the steel balls 410 and the steel rings 420 through the aerial lateral head clamp, 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.

[0024] 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, and the adjustment component includes a connecting column 320, an adjustment block 330 and a screw sleeve 340, wherein the two clamp 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 matched with 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 clamp arm 40; when calibrating the position of the head clamp 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, 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 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.

[0025] 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 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. 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 clamp arms 40 to align the steel balls 410 and the steel rings 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.

[0026] To reiterate, the relative pitch angle between the steel ball 410 and the steel ring 420 in the clamp arm 40 is always at the same horizontal position no matter how it is adjusted. Therefore, the pitch angle does not affect the imaging position 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.

[0027] 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 is slidably connected between the two columns 70, and a clamping pad 810 is 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 pads 810, thereby further improving the stability of clamping and fixing the patient's head.

[0028] The present invention also discloses a geometric calibration method for a lateral head clamp of a CT device, comprising the following steps: S1: empty shot of lateral head clamp; Specifically, before geometric calibration, it is necessary to first perform an air shot using a lateral view in the anteroposterior mode; 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; Specifically, in the lateral view mode, the two clamp arms 40 of the head clamp are parallel to the line between the detector and the radiation source. This design makes it easy for the radiation to pass through the steel ball 410 and the steel ring 420 and then be received by the detector.

[0029] S3: Detect whether the image formed by the steel ball 410 in the detector is inside the steel ring 420; Specifically, after the aerial photo is taken, the image is continuously checked. 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.

[0030] In addition, when detecting the position of the image formed by the steel ball 410 in the detector after the air shooting 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.

[0031] 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 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.

[0032] When 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 following steps are performed: 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 clamp 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.

[0033] 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 strength but also improves the stability of the patient's head, making it easier for the radiation source to emit rays that accurately pass through the patient's head and the detector to receive the signal to form a photographed image.

[0034] The working principle of the present invention is as follows: when a patient needs to undergo oral CT scanning, the patient first sits on the seat 120, and the patient can place the lower jaw on the top of the jaw support plate 30, so that the patient's head can be supported. The two clamp arms 40 provided separately can be used in conjunction with the jaw support plate 30, so that the end of the clamp arm 40 away from the jaw support plate 30 is inserted into the patient's ear hole, and then the patient's head can be clamped and fixed, so that the patient's head can be supported and fixed from bottom to top, so the patient does not need to stand and move, which can not only improve the patient's comfort, but also fix the head more stably, avoid image blurring due to slight shaking of the head during scanning, and improve the shooting quality. The steel ball 410 and steel ring 420 are provided to detect whether the two clamp arms 40 are at the same horizontal line with the radiation source and the detector. Specifically, the lateral head clamp is used to make the radiation source pass through the steel ball 410 and the steel ring 420 and the detector receives the signal, and then detect whether the image formed by the steel ball 410 in the detector is 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, continue to perform the above calibration steps 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 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, and then the mounting plate 20 can be slightly rotated to drive the jaw support plate 30 to rotate left or 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 to perform 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 to the left or right relative to the steel ring 420, continue to perform the above calibration steps until it is detected that the image formed by the steel ball 410 in the detector is exactly located inside the steel ring 420.

[0035] 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 the present invention has been described 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, wherein a support column (110) is arranged on the top of the base (10), and the head support is arranged on the top of the support column (110) and is used to support the patient's jaw so as to fix the patient's head from bottom to top; 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.

2. The lateral head clamp for CT equipment according to claim 1, characterized in that: The head support component comprises a mounting plate (20) arranged on the top of a support column (110) and a jaw support plate (30) arranged on a side wall of the mounting plate (20); a mounting column (310) is provided on a side of the jaw support plate (30) facing the mounting plate (20); a mounting hole (210) matching the mounting column (310) is provided on a side of the mounting plate (20) facing the jaw support plate (30); and 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 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) being provided with a steel ball (410), and a clamping end of the other clamping arm (40) being 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).

4. The lateral head clamp for CT equipment according to claim 3, 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).

5. 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), 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.

6. The lateral head clamp for CT equipment according to claim 1, 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).

7. A method for geometrically calibrating a CT device lateral head clamp using the CT device lateral head clamp as claimed in any one of claims 1 to 6, characterized in that: include: S1: empty shot of lateral head clamp; S2: by taking a lateral radiograph, the radiation source passes through a steel ball (410) in one clamp arm (40) and a steel ring (420) in another 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).

8. The geometric calibration method of the lateral head clamp of the CT equipment according to claim 7, characterized in that: When it is detected in step S3 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.

9. The geometric calibration method of the lateral head clamp of the CT equipment according to claim 7, characterized in that: When it is detected in step S3 that the image formed by the steel ball (410) 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 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 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. The geometric calibration method of the lateral head clamp of the CT equipment according to claim 7, characterized in that: When it is detected in step S3 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 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 position of the steel ball (410) and the steel ring (420) in the two clamping arms (40) so that the steel ball (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).

11. An oral CT, comprising the lateral head clamp of the CT equipment according to any one of claims 1 to 6, 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