Area collimator and dose area meter calibration tool
By designing the area of the area structure, the multi -layer baffle component is used to reduce the X -ray scattering, improve the accuracy of the detection of the dosage area, and is easy to carry. The problem of the perpetrator is not convenient for handling.
Patent Information
- Application Number
- CN202420806784.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-18
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-04-18
AI Technical Summary
When the existing area collimator is irradiated with the X-ray light source, X-rays that have not passed through the through hole will be scattered, resulting in the radiation dose data detected by the dose area meter being too high, affecting the calibration results. At the same time, the area collimator as a whole is heavier , inconvenient for handling.
Designed a area of direct device, a baffle component and a fixed bracket with a split structure, including multiple first bubbles and second baffle, set up a multi -layer penetration perforation, and the X -ray that cannot pass through the perforation will be on Multiple reflections are generated between baffle, reducing scattering, and increasing the consistency of X -ray strength.
Effectively reduce the degree of scattering of X -ray, improve the accuracy of the radiation dose detected by the dosage area, achieve more accurate calibration results, and use the split structure to be easy to carry, reducing the difficulty of the staff's handling.
Smart Images
Figure CN222398431U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of instrument calibration, in particular to an area collimator and a dose area meter calibration tool. Background Art
[0002] With the development of medical technology, X-ray imaging technology has been widely used in clinical diagnosis and medical research, which has greatly helped patients' disease examinations and doctors' diagnosis. However, while patients benefit from X-ray examinations, they also need to endure the radiation damage caused by X-rays to the body. How to calculate the radiation dose in X-rays has received more and more attention. Therefore, dose area meters are introduced on the market to measure the radiation dose in X-rays. In order to ensure the accuracy of the test data of the dose area meter, the dose area meter needs to be calibrated regularly. When calibrating the dose area meter, an area collimator and an X-ray light source are mostly used. The area collimator is used to limit the light area of the X-ray light source irradiating the dose area meter, so that the dose area meter detects the radiation dose in the fixed X-ray irradiation area. A through hole is set on the area collimator to limit the irradiation area of the X-ray.
[0003] However, when the X-ray light source irradiates the area collimator, the X-rays that do not pass through the through hole will be scattered, causing the intensity of the X-rays that pass through the through hole to increase, and the radiation dose data detected by the dose area meter is too high, affecting the calibration result of the dose area meter. At the same time, the area collimators on the market are generally heavy and inconvenient for workers to carry.
[0004] Therefore, there is an urgent need for an area collimator and a dose area meter calibration tool to solve the above technical problems. Utility Model Content
[0005] The purpose of the utility model is to provide an area collimator, which can reduce the scattering degree of X-rays, improve the accuracy of the radiation dose detected by the dose area meter, and achieve more accurate calibration of the dose area meter. At the same time, it is easy to carry and reduces the difficulty of carrying by staff.
[0006] To achieve this purpose, the utility model adopts the following technical solutions:
[0007] An area collimator is configured to calibrate a dose area meter, the area collimator comprising:
[0008] Base plate;
[0009] A fixed bracket, perpendicular to the bottom plate, the fixed bracket is provided with a plurality of first slots and a plurality of second slots along the width direction, the first slots are located in the middle of the fixed bracket, and the second slots are distributed on both sides of the first slot;
[0010] The baffle assembly includes a plurality of first baffles and a plurality of second baffles. The first baffle is provided with a first through hole. The first baffle is placed in the first slot. The area of the second baffle is larger than that of the first baffle. The second baffle is placed in the second slot. The second baffle is provided with a second through hole, and the second through hole is always opposite to the first through hole.
[0011] As a preferred technical solution of the area collimator, the baffle assembly includes at least 4 of the first baffles. The thickness of the first baffle is 2.5 mm, and the first baffle is made of tungsten steel.
[0012] As a preferred technical solution of the area collimator, the baffle assembly includes at least 2 of the second baffles. The thickness of the second baffle is 5.0 mm, and the second baffle is made of tungsten steel.
[0013] As a preferred technical solution of the area collimator, the fixing bracket has a "U" - shaped structure, and the first slot and the second slot are both arranged at opposite two side positions of the fixing bracket.
[0014] As a preferred technical solution of the area collimator, the fixing bracket includes a detachable first bracket and a second bracket. Both the first bracket and the second bracket have a "U" - shaped structure. The first bracket is placed inside the second bracket. The second slot is arranged at two opposite sides of the second bracket. The second slot is located on both sides of the first bracket. The first slot is arranged at two opposite sides of the first bracket.
[0015] As a preferred technical solution of the area collimator, the first through hole is located at the center of the first baffle, and the second through hole is located at the center of the second baffle. The area collimator further includes a first spacer, which is located between the first bracket and the second bracket to make the first through hole and the second through hole always opposite.
[0016] As a preferred technical solution of the area collimator, the fixing bracket further includes a third bracket. The shape of the third bracket is the same as that of the first bracket. The second bracket is placed inside the third bracket. The third bracket has a third slot. The baffle assembly further includes a third baffle. The third slot is arranged on both sides of the second bracket. The third baffle is inserted into the third slot. The third baffle has a third through hole, and the third through hole is always opposite to the first through hole and the second through hole.
[0017] As a preferred technical solution of the area collimator, the third through hole is located at the center of the third baffle, and the area collimator also includes a second pad, which is located between the third bracket and the second bracket so that the second through hole is always opposite to the third through hole.
[0018] As a preferred technical solution of the area collimator, the shape of the first through hole is circular or square; and / or the shape of the second through hole is circular or square.
[0019] The second object of the utility model is to provide a dose area meter calibration tool. To achieve this object, the utility model adopts the following technical solutions:
[0020] A dose area meter calibration tool comprises the area collimator described in any one of the above items. The dose area meter calibration tool also comprises an X-ray light source and a placement frame, the placement frame is used to fix the dose area meter, and the area collimator is located between the X-ray light source and the placement frame.
[0021] The beneficial effects of the utility model are:
[0022] The area collimator provided by the utility model designs the baffle assembly and the fixed bracket as a split structure, which is convenient for workers to disassemble the first baffle and the second baffle. When moving the area collimator, the workers can separately store the baffle assembly and other components, which reduces the difficulty of carrying for the workers; the first baffle and the second baffle are both provided with multiple layers, and the X-rays that do not pass through the first through hole and the second through hole will generate multiple reflections between the first baffle and the first baffle, thereby effectively reducing the scattering degree of the X-rays that do not pass through the first baffle and the second baffle, thereby ensuring that the intensity of the fixed area X-rays is closer to the ideal value, solving the problem of high test data of the dose area meter in the prior art, and improving the accuracy of the test data of the dose area meter, so as to facilitate the subsequent calibration of the dose area meter.
[0023] The dose area meter calibration tool provided by the utility model has a simple overall structure and is easy to operate, and can realize rapid and accurate calibration of the dose area meter. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 It is a structural schematic diagram of the area collimator provided by the utility model (the baffle assembly is not shown);
[0025] Figure 2 This is a schematic diagram of the first baffle structure of the area collimator provided by the utility model;
[0026] Figure 3 It is a schematic diagram of the second baffle structure of the area collimator provided by the utility model.
[0027] In the figure:
[0028] 1. Bottom plate;
[0029] 2. Fixed bracket; 21. First bracket; 211. First slot; 22. Second bracket; 221. Second slot; 23. Third bracket; 231. Third slot;
[0030] 31, first baffle; 311, first through hole; 32, second baffle; 321, second through hole;
[0031] 4. The first cushion block; 5. The second cushion block. DETAILED DESCRIPTION
[0032] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.
[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0034] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0035] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.
[0036] Embodiment 1
[0037] This embodiment provides an area collimator, which is placed between the X-ray source and the dose area meter, and is used to limit the irradiation area of the X-rays emitted by the X-ray source to ensure that the dose area meter can detect the radiation amount of the X-rays in a fixed irradiation area, and calibrate the dose area meter according to the reference data. Figures 1 to 3 As shown in the figure, the area collimator includes a base plate 1, a fixed bracket 2 and a baffle assembly, the fixed bracket 2 is placed vertically on the base plate 1, and a plurality of first slots 211 and second slots 221 are provided on the fixed bracket 2 along the width direction, wherein the first slot 211 is located in the middle position of the fixed bracket 2, and the second slots 221 are arranged on both sides of the first slot 211, and the baffle assembly includes a plurality of first baffles 31 and a plurality of second baffles 32, wherein the first baffle 31 is placed in the first slot 211, and the second baffle 32 is placed in the second slot 221, and the baffle assembly and the fixed bracket 2 are designed as a split structure, which is convenient for the staff to disassemble the first baffle 31 and the second baffle 32, and when moving the area collimator, the staff can separately store the baffle assembly and other components, thereby reducing the difficulty of the staff in carrying.
[0038] The first baffle plate 31 is provided with a first through hole 311, and the second baffle plate 32 is provided with a second through hole 321. The first through hole 311 is opposite to the second through hole 321. Since the first baffle plate 31 and the second baffle plate 32 are both provided with multiple layers, the X-rays that do not pass through the first through hole 311 and the second through hole 321 will generate multiple reflections between the first baffle plate 31 and the first baffle plate 31, thereby effectively reducing the scattering degree of the X-rays that do not pass through the first baffle plate 31 and the second baffle plate 32, thereby ensuring that the X-ray intensity of the fixed area is closer to the ideal value, solving the problem of high test data of the dose area meter in the prior art, and improving the accuracy of the test data of the dose area meter.
[0039] The area of the second baffle 32 is larger than that of the first baffle 31. When facing X-ray light sources of different specifications, the staff can choose whether to insert the second baffle 32 according to the illumination range of the current X-ray emitting light source. When the illumination range of the X-ray emitting light source is small, the staff only needs to insert the first baffle 31. When the illumination range of the X-ray emitting light source is large, the staff can insert the first baffle 31 and the second baffle 32 at the same time. In this way, the area collimator has higher versatility and is compatible with X-ray emitting light sources of various specifications on the market.
[0040] Preferably, the area of the second through-hole 321 is larger than that of the first through-hole 311 and smaller than the area of the first baffle 31. This can not only ensure that the X-rays emitted by the X-ray source irradiate the dose area meter with a fixed irradiation area, but also reduce the weight of the second baffle 32, facilitating the handling of the baffle assembly by the staff.
[0041] In this embodiment, the first baffle 31 is made of a tungsten steel plate with a thickness of 2.5 mm. There are at least four first baffles 31 in the baffle assembly, and the fixing bracket 2 is correspondingly provided with at least 4 first slots 211. X-rays have strong penetration ability. According to experiments, a 10-mm tungsten steel plate is required to completely block X-rays. Setting the first baffle 31 to be 2.5 mm thick and having 4 pieces can not only effectively block the X-rays that fail to pass through the first through-hole 311, but also effectively weaken the intensity of the X-rays that do not pass through the first through-hole 311, further improving the accuracy of the detection results of the dose area meter.
[0042] In this embodiment, the second baffle 32 is made of a tungsten steel plate with a thickness of 5 mm. There are at least two second baffles 32 in the baffle assembly. Since the second baffle 32 blocks the light at the edge with较弱 intensity emitted by the X-ray source, setting 2 second baffles 32 can fully meet the test standard, and at the same time, it can also reduce the workload of the staff in processing the area collimator.
[0043] Preferably, the fixing bracket 2 has a "U"-shaped structure, which has a simple structure and high stability. The first slot 211 and the second slot 221 are both provided on the opposite two sides of the fixing bracket 2, so that it is convenient for the staff to take and place the first baffle 31 and the second baffle 32, improving the convenience of assembling the area collimator.
[0044] Preferably, the fixing bracket 2 includes a detachable first bracket 21 and a second bracket 22 to facilitate the handling of the fixing bracket 2 more conveniently. Both the first bracket 21 and the second bracket 22 have a "U"-shaped structure. The specification of the second bracket 22 is larger than that of the first bracket 21. The first bracket 21 is fixedly placed inside the second bracket 22. The first slot 211 is provided on the side of the first bracket 21, and the second slot 221 is located on the side of the second bracket 22 and on both sides of the first bracket 21. During actual assembly, the first baffle 31 is assembled inside the first bracket 21, and the second baffle 32 is assembled inside the second bracket 22. To further ensure the stability of the overall structure of the area collimator, a filling block can be selected to be placed in the interval between the first bracket 21 and the second bracket 22.
[0045] Preferably, the first through hole 311 is arranged at the center of the first baffle 31, and the second through hole 321 is arranged at the center of the second baffle 32, which makes it easier to process the first baffle 31 and the second baffle 32. The vertical area collimator also includes a first pad 4, wherein the first pad 4 is placed between the first bracket 21 and the second bracket 22. Due to the difference in specifications between the first bracket 21 and the second bracket 22, after the first baffle 31 and the second baffle 32 are placed on the first bracket 21 and the second bracket 22, the first through hole 311 and the second through hole 321 may not be opposite to each other due to height issues, that is, the first through hole 311 may be blocked by the unopened portion of the second baffle 32. The setting of the first gasket can adjust the height of the first bracket 21, thereby making the first through hole 311 and the second through hole 321 in a relatively set state, so as to ensure that the area collimator can be used normally.
[0046] In order to further improve the versatility of the area collimator and adapt it to more models of X-ray light sources, in this embodiment, the fixed bracket 2 also includes a third bracket 23. The shape of the third bracket 23 is consistent with that of the first bracket 21, and the specifications of the third bracket 23 are larger than those of the second bracket 22. During actual assembly, the second bracket 22 is placed in the third bracket 23, and a filling block can also be placed in the interval between the second bracket 22 and the third bracket 23. A third slot 231 is provided on the third bracket 23, and the third slot 231 is arranged on both sides of the second bracket 22. The baffle assembly also includes a third baffle, which is plugged into the third slot 231. At the same time, in order to enable the light emitted by the X-ray light source to pass through the area collimator, a third through hole is provided on the third baffle, and the third through hole is arranged opposite to the first through hole 311 and the second through hole 321.
[0047] To facilitate the processing of the third baffle, the third through hole is set at the center of the third baffle. To facilitate the adjustment of the height difference between the second baffle 32 and the third baffle, the area collimator also includes a second pad 5, wherein the second pad 5 is placed between the third bracket 23 and the second bracket 22, so that the third through hole is opposite to the first through hole 311 and the second through hole 321, so that the light emitted by the X-ray light source can be irradiated onto the dose area meter.
[0048] According to the JJF1479-2014 dose area meter calibration specification, in this embodiment, the shape of the first through hole 311 is circular or square, and the aperture of the first through hole 311 is between 40 mm and 60 mm. At the same time, in order to facilitate the processing of the second baffle 32 and the third baffle, the shape of the second through hole 321 and the third through hole is also circular or square.
[0049] Embodiment 2
[0050] This embodiment provides a dose area meter calibration tool, including the area collimator in Embodiment 1. The dose area meter calibration tool also includes an X-ray light source and a placement frame. The placement frame is used to fix the dose area meter. The area collimator is located between the X-ray light source and the placement frame. The X-rays emitted by the X-ray light source pass through the first through hole 311 in the area collimator and then irradiate the dose area meter.
[0051] The present embodiment provides a calibration method for a dose area meter, which includes placing an area collimator in front of an X-ray emitting light source, adjusting the placement position of the area collimator so that the central X-ray emitted by the X-ray light source passes through the first through hole 311 to form an X-ray with a fixed irradiation area, placing a placement frame in front of the area collimator, placing the dose area meter to be calibrated on the placement frame, and facing the first through hole 311, measuring the radiation dose of the X-ray in the fixed irradiation area, recording a first set of data, removing the calibrated dose area meter from the placement frame, preparing a dose area meter with accurate data, placing it on the placement frame to measure the radiation dose of the X-ray, recording a second set of data, comparing the first set of data with the second set of data, and using the second set of data as a reference to calibrate the uncalibrated dose area meter.
[0052] The dose-area meter calibration tool in this embodiment has a simple overall structure and is easy to operate, and can realize fast and accurate calibration of the dose-area meter.
[0053] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.
Claims
1. An area collimator configured as a calibrated dose area meter, characterized in that: The area collimator includes: A bottom plate (1); A fixed bracket (2), perpendicular to the bottom plate (1). The fixed bracket (2) is provided with a plurality of first slots (211) and a plurality of second slots (221) along the width direction. The first slots (211) are located in the middle of the fixed bracket (2), and the second slots (221) are distributed on both sides of the first slots (211); A baffle assembly, including a plurality of first baffles (31) and a plurality of second baffles (32). The first baffle (31) is provided with a first through hole (311). The first baffle (31) is placed in the first slot (211). The area of the second baffle (32) is larger than that of the first baffle (31). The second baffle (32) is placed in the second slot (221). The second baffle (32) is provided with a second through hole (321), and the second through hole (321) is always opposite to the first through hole (311).
2. The area collimator according to claim 1, characterized in that: The baffle assembly includes at least 4 of the first baffles (31). The thickness of the first baffle (31) is 2.5 mm, and the first baffle (31) is made of tungsten steel.
3. The area collimator according to claim 1, characterized in that: The baffle assembly includes at least 2 of the second baffles (32). The thickness of the second baffle (32) is 5.0 mm, and the second baffle (32) is made of tungsten steel.
4. The area collimator according to claim 1, characterized in that: The fixed bracket (2) has a "U" - shaped structure, and the first slots (211) and the second slots (221) are both arranged on two opposite sides of the fixed bracket (2).
5. The area collimator according to claim 4, characterized in that: The fixed bracket (2) includes a detachable first bracket (21) and a second bracket (22). Both the first bracket (21) and the second bracket (22) have a "U" - shaped structure. The first bracket (21) is placed inside the second bracket (22). The second slots (221) are arranged on two opposite sides of the second bracket (22). The second slots (221) are located on both sides of the first bracket (21), and the first slots (211) are located on two opposite sides of the first bracket (21).
6. The area collimator according to claim 5, characterized in that: The first through hole (311) is located at the center of the first baffle (31), and the second through hole (321) is located at the center of the second baffle (32). The area collimator further includes a first spacer (4), and the first spacer (4) is located between the first bracket (21) and the second bracket (22) so that the first through hole (311) is always opposite to the second through hole (321).
7. The area collimator according to claim 5, characterized in that: The fixed bracket (2) further comprises a third bracket (23), the shape of the third bracket (23) being consistent with that of the first bracket (21), the second bracket (22) being placed in the third bracket (23), the third bracket (23) having a third slot (231), the baffle assembly further comprising a third baffle, the third slot (231) being arranged on both sides of the second bracket (22), the third baffle being inserted into the third slot (231), the third baffle having a third through hole, the third through hole being always opposite to the first through hole (311).
8. The area collimator according to claim 7, characterized in that: The third through hole is located at the center of the third baffle, and the area collimator further comprises a second cushion block (5), wherein the second cushion block (5) is located between the third bracket (23) and the second bracket (22), so that the third through hole is always opposite to the first through hole (311).
9. The area collimator according to any one of claims 1 to 8, characterized in that: The shape of the first through hole (311) is circular or square; and / or the shape of the second through hole (321) is circular or square.
10. A dose area meter calibration tool, characterized in that: The area collimator comprises the area collimator of any one of claims 1 to 9, wherein the dose area meter calibration tool further comprises an X-ray light source and a placement frame, wherein the placement frame is used to fix the dose area meter, and the area collimator is located between the X-ray light source and the placement frame.