An oral cbct dose test support

Abstract

The utility model discloses a kind of oral cavity CBCT dose test support, including parallelly arranged first fixed plate and second fixed plate, both ends of first fixed plate and second fixed plate are connected by first threaded rod;Vertical support plate is connected on the outside of the second fixed plate, the bottom of support plate is connected with KAP instrument tray of horizontal arrangement;Formed through-hole in the center of the support plate, baffle is equipped at the left, right and lower edge of through-hole, three baffle enclose film slot;Dose instrument installation mechanism is movably connected on the baffle.The utility model can be fixed in the tube ball part of oral cavity CBCT, rotate with oral cavity CBCT frame synchronously, ensure the stability of detector fixed.Meanwhile, the utility model can also be positioned and fixed to KAP instrument and diagnostic film etc., meet the requirement of oral cavity CBCT equipment quality control detection standard, improve test efficiency, guarantee measurement result accurate and reliable.

Description

Technical Field

[0001] This utility model relates to the field of quality control and testing technology for radiological diagnostic and treatment equipment, and in particular to a dental CBCT dose testing bracket. Background Technology

[0002] Oral CBCT (Cone Beam Computed Tomography), also known as oral CT, involves rotating the beam around the head to acquire data. It provides three-dimensional tomographic imaging of the teeth, jaw, and other parts of the oral cavity, enabling the detection of lesions that are not visible or are more subtle than those detected by conventional intraoral X-ray imaging. In particular, the three-dimensional reconstruction imaging of oral CBCT has been successfully used in the diagnosis of various diseases, including preoperative measurements for dental implants, oral inflammation, oral tumors, and maxillary sinus fistulas.

[0003] To ensure the imaging quality of dental CBCT and reduce the radiation dose to patients, regular quality control testing of the equipment is necessary to ensure that its performance meets the needs of clinical dental X-ray diagnosis. The publication and implementation of the health industry standard WS 818-2023, "Quality Control Testing Standard for Cone-Beam Computed Tomography (CBCT) Equipment," requires dosimetric testing of dental CBCT equipment (including deviations in tube voltage indication, radiation output repeatability, exposure time indication, useful beam half-value layer, and KAP indication deviation). Currently, commonly used equipment for dosimetric testing includes KAP (airkerma area product) meters, multi-functional X-ray diagnostic dosimeters, and diagnostic radiographic films. However, the aforementioned industry standard does not specify the requirements for the testing devices, nor does it provide information on their placement and specific locations. Based on practical experience, our research team identified the following problems in oral CBCT dosimetry testing: 1. The variety of oral CBCT types makes it impossible to uniformly position the dosimetry devices used, leading to inaccurate results; 2. The diverse types and sizes of dosimetry devices, such as KAP meters, multi-functional X-ray diagnostic dosimeters, and diagnostic film dosimeters, make it impossible to uniformly fix the measurement position. During on-site testing, tape or similar methods are often used for fixation. However, during the rotation of the oral CBCT gantry, detectors may loosen or detach, causing dose discrepancies and severely hindering testing efficiency, reliability, and accuracy. Therefore, there is an urgent need to develop an auxiliary oral CBCT dosimetry tool that can be used with various types of oral CBCTs and is compatible with different types of detectors. Utility Model Content

[0004] In order to solve the above-mentioned technical problems, this utility model provides an oral CBCT dosimetry support.

[0005] This application is achieved using the following technical solution.

[0006] A dental CBCT dosimetry support includes a first fixing plate and a second fixing plate arranged in parallel, with both ends of the first fixing plate and the second fixing plate connected by a first threaded rod; a vertically arranged support plate is connected to the outside of the second fixing plate, and a horizontally arranged KAP instrument tray is connected to the bottom of the support plate; a through hole is formed in the center of the support plate, and baffles are provided on the left, right and lower edges of the through hole, with the three baffles forming a film slot; a dosimeter mounting mechanism is movably connected to the baffles.

[0007] Furthermore, one end of the first threaded rod is rotatably connected to the second fixed plate, and the other end passes through the threaded hole of the first fixed plate and is placed outside the first fixed plate.

[0008] Furthermore, both the first fixing plate and the second fixing plate have anti-slip layers on their opposing surfaces.

[0009] Furthermore, a second threaded rod is connected to both ends of the side wall of the second fixing plate away from the first fixing plate, and the upper part of the support plate is rotatably connected to the second threaded rod.

[0010] Furthermore, the support plate is provided with a horizontal bubble.

[0011] Furthermore, both ends of the KAP instrument tray are provided with elastic clips for fixing the KAP instrument.

[0012] Furthermore, a scale is provided on the outer wall of the baffle.

[0013] Furthermore, the dosimeter mounting mechanism includes a vertically arranged base plate with two adjusting screws in the middle of the base plate. The tail ends of the adjusting screws pass through the base plate and are rotatably connected to the movable plate. Hook plates are connected to both sides of the upper end of the base plate, and a fixed plate is connected to the lower part of the two hook plates. The effective area of ​​the detector of the multifunctional X-ray diagnostic dosimeter is placed between the fixed plate and the movable plate.

[0014] This application has the following beneficial effects.

[0015] (1) This utility model can be stably fixed to the tube of the oral CBCT and rotate synchronously with the oral CBCT gantry, effectively solving the problems of instability and inaccurate placement of detectors caused by fixing detectors (KAP instrument, multi-functional X-ray diagnostic dosimeter, diagnostic film dosimeter, etc.) with tape or other means.

[0016] (2) This utility model can simultaneously fix and precisely place the KAP instrument, diagnostic film dosimeter, etc., to meet the dosimetric testing requirements in WS818-2023 "Quality Control and Testing Standard for Cone Beam X-ray Computed Tomography (CBCT) Equipment". Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the dosimeter mounting mechanism of this utility model;

[0019] Figure 3 This is a diagram showing the usage status of the dosimeter mounting mechanism of this utility model.

[0020] Among them, 1. First fixing plate; 2. Second fixing plate; 3. First threaded rod; 4. Second threaded rod; 5. Support plate; 6. KAP instrument tray; 7. Through hole; 8. Baffle; 9. Scale; 10. Elastic clip; 11. Bubble level; 12. Anti-slip layer; 13. Base plate; 14. Hook plate; 15. Fixing plate; 16. Moving plate; 17. Adjusting screw. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] like Figure 1-3 As shown, an oral CBCT dosimeter support includes a first fixing plate 1, a second fixing plate 2, a first threaded rod 3, a second threaded rod 4, a support plate 5, a KAP instrument tray 6, a baffle 8, and a dosimeter mounting mechanism.

[0023] The first fixing plate 1 and the second fixing plate 2 are located on the same horizontal plane and are arranged parallel to each other. Both ends of the first fixing plate 1 and the second fixing plate 2 are connected by a first threaded rod 3. Specifically, a through threaded hole is formed on the first fixing plate 1, and a blind hole is formed on the second fixing plate 2. One end of the first threaded rod 3 is placed in the blind hole and rotatably connected to the second fixing plate 2, while the other end passes through the threaded hole and is placed outside the first fixing plate 1. This utility model can adjust the distance between the first fixing plate 1 and the second fixing plate 2 by rotating the two first threaded rods 3, thereby clamping the utility model onto the tube of the oral CBCT and achieving fixation. Preferably, the utility model can be provided with an anti-slip layer 12 on the opposing surfaces of the first fixing plate 1 and the second fixing plate 2. The anti-slip layer 12 can be made of anti-slip texture or fitted with anti-slip rubber to increase the friction between the fixing plate and the contact surface of the equipment, prevent relative sliding between the two, and improve the stability of the entire bracket installation.

[0024] A second threaded rod 4 is threaded to both ends of the second fixed plate 2 on the side away from the first fixed plate 1. A vertically arranged support plate 5 is rotatably connected to the second threaded rod 4. The distance between the support plate 5 and the dental CBCT device can be adjusted by adjusting the depth to which the second threaded rod 4 is screwed into the second fixed plate 2.

[0025] The bottom of the support plate 5 is connected to a horizontally positioned KAP instrument tray 6, on which the KAP instrument is placed. Elastic clips 10 are provided at both ends of the upper surface of the KAP instrument tray 6, which can be used to fix the KAP instrument. Specifically, one end of the elastic clip 10 is fixed to the end of the KAP instrument tray 6, and the other end is movably positioned in the middle of the KAP instrument tray 6. When not in use, the elastic clip 10 is attached to the KAP instrument tray 6; when it is necessary to fix the KAP instrument, the movable end of the elastic clip 10 is pried open upwards, the KAP instrument is placed on the KAP instrument tray 6 and positioned between the two elastic clips 10. Under the action of elastic force, the movable end of the elastic clip 10 will eventually abut against the side wall of the KAP instrument, thus fixing the KAP instrument.

[0026] A through hole 7 is formed in the center of the support plate 5. L-shaped baffles 8 are provided on the left, right, and lower edges of the through hole 7. The three baffles 8 together form the slot for the film. A scale 9 is also provided on the baffle 8. The scale 9 can be used to calculate the size of the shadow formed after the film is exposed, and can also be used to determine the placement position of the detector of the multifunctional X-ray diagnostic dosimeter (i.e., the center area of ​​the shadow on the film).

[0027] This application also includes a movable dosimeter mounting mechanism on the baffle 8. The dosimeter mounting mechanism includes a base plate 13, with L-shaped hook plates 14 connected to both sides of the upper end of the base plate 13. The vertical plates of the hook plates 14 can be inserted between the baffle 8 and the support plate 5, and the horizontal plates of the hook plates 14 can rest on the top of the baffle 8, thus achieving a movable connection between the dosimeter mounting mechanism and the support plate 5. To facilitate adjustment of the detector position of the multifunctional X-ray diagnostic dosimeter, this application also includes a movable clamping component in the dosimeter mounting mechanism. Specifically, two adjusting screws 17 are provided in the center of the base plate 13. The adjusting screws 17 are threadedly connected to the base plate 13, and the tail ends of the adjusting screws 17 protrude from the base plate 13 and are rotatably connected to the moving plate 16. By screwing in or out the adjusting screws 17, the distance between the moving plate 16 and the base plate 13 can be adjusted. This application also includes a fixing plate 15 connected to the lower middle part of the two hook plates 14. The fixing plate 15 and the moving plate 16 are arranged on the same horizontal plane. With the above structure, after the detector of the multifunctional X-ray diagnostic dosimeter is placed at the accurate position between the fixed plate 15 and the movable plate 16, the dosimeter detector can be clamped by adjusting the adjusting screw 17.

[0028] This application also provides a level bubble 11 on the support plate 5 to indicate the levelness of the entire device after it is installed on the oral CBCT equipment.

[0029] The method of using this utility model is as follows:

[0030] 1. Positioning and Fixing: The bracket of this utility model is placed on the tube of the oral CBCT via the first fixing plate 1 and the second fixing plate 2, and is tightened by rotating the first threaded rod 3. Then, the display and indication of the level bubble 11 are used to ensure that the bracket is installed vertically and that the through hole 7 is perpendicular to the X-ray outlet of the tube.

[0031] 2. KAP Instrument Measurement Process: Connect the KAP instrument to the power supply, then place it vertically on the KAP instrument tray 6, securing it with elastic clips 10 to prevent it from falling when stationary or during rotation of the oral CBCT gantry; set the output beam parameters for the oral CBCT and perform exposure. Then, read the results from the KAP instrument's display window;

[0032] 3. Film Measurement Process: In actual dose testing, if a KAP meter is not available, a diagnostic film dosimeter can be used to determine the KAP value. The specific operation is as follows: Cut the film to a suitable size so that it matches the boundary of the film slot formed by the three baffles 8. Since the baffles 8 have a scale 9, the size of the film can be determined. Place the cut film between the baffles 8 and the support plate 5, covering the through-hole 7. Set the beam output parameters for the oral CBCT and perform exposure. After exposure, a square shadow will be left on the film according to the size of the irradiation field. Then, using the scale 9, calculate the area of ​​the shadow. Additionally, the film itself is a dosimeter, so the dose can also be determined. Multiplying the dose and area gives the final KAP value.

[0033] 4. The dose on the film can also be measured using a multifunctional X-ray diagnostic dosimeter. The effective area of ​​the detector of the multifunctional X-ray diagnostic dosimeter is fixed at the position of the shadow on the film using a fixed plate 15 and a movable plate 16. The dose value can be read directly. The KAP value can be obtained by multiplying the dose value by the area of ​​the shadow on the film.

[0034] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A dental CBCT dosimetry support, characterized in that: The device includes a first fixing plate (1) and a second fixing plate (2) arranged in parallel. Both ends of the first fixing plate (1) and the second fixing plate (2) are connected by a first threaded rod (3). A vertically arranged support plate (5) is connected to the outside of the second fixing plate (2). A horizontally arranged KAP instrument tray (6) is connected to the bottom of the support plate (5). A through hole (7) is formed in the center of the support plate (5). Baffles (8) are provided on the left, right and lower edges of the through hole (7). The three baffles (8) form a film slot. A dosing instrument mounting mechanism is movably connected to the baffles (8).

2. The oral CBCT dosimetry support according to claim 1, characterized in that: One end of the first threaded rod (3) is rotatably connected to the second fixed plate (2), and the other end passes through the threaded hole of the first fixed plate (1) and is placed outside the first fixed plate (1).

3. The oral CBCT dosimetry support according to claim 1, characterized in that: Anti-slip layer (12) is provided on the opposite surfaces of the first fixing plate (1) and the second fixing plate (2).

4. The oral CBCT dosimetry support according to claim 1, characterized in that: A second threaded rod (4) is connected to both ends of the side wall of the second fixing plate (2) away from the first fixing plate (1), and the upper part of the support plate (5) is rotatably connected to the second threaded rod (4).

5. The oral CBCT dosimetry support according to claim 1, characterized in that: The support plate (5) is provided with a horizontal bubble (11).

6. The oral CBCT dosimetry support according to claim 1, characterized in that: Both ends of the KAP instrument tray (6) are provided with elastic clips (10) for fixing the KAP instrument.

7. The oral CBCT dosimetry support according to claim 1, characterized in that: A scale (9) is provided on the outer wall of the baffle (8).

8. The oral CBCT dosimetry support according to claim 1, characterized in that: The dosimeter mounting mechanism includes a vertically arranged base plate (13), with two adjusting screws (17) in the middle of the base plate (13). The tail end of the adjusting screw (17) passes through the base plate (13) and is rotatably connected to the moving plate (16). Hook plates (14) are connected to both sides of the upper end of the base plate (13), and a fixing plate (15) is connected to the lower part of the two hook plates (14). The effective area of ​​the detector of the multifunctional X-ray diagnostic dosimeter is placed between the fixing plate (15) and the moving plate (16).

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