Integrated die body for CBCT quality control calibration and performance detection
By designing an integrated phantom with multiple functions, the problem of fragmented functions in the calibration and quality control phantoms of cone-beam X-ray computed tomography equipment was solved, enabling efficient and accurate detection and evaluation.
Patent Information
- Application Number
- CN202423143538.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2034-12-19
AI Technical Summary
The existing calibration and quality control phantoms for cone-beam X-ray computed tomography (CBX) equipment are fragmented, resulting in inconvenience, high cost, and low efficiency.
Design an integrated phantom that integrates functions such as geometric calibration, CT value calibration, linear calibration, high-resolution detection, and low-contrast detection, and installs it onto a CT device for detection via a threaded connection.
It simplifies the quality control process, improves operational convenience and testing efficiency, enables the testing of multiple parameters at once, and enhances testing accuracy and equipment performance evaluation.
Smart Images
Figure CN223831116U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical imaging equipment technology, specifically an integrated phantom for CBCT quality control calibration and performance testing. Background Technology
[0002] Cone-beam computed tomography (CBCT) is a medical imaging technique that uses a cone-shaped X-ray beam to penetrate the human body. Based on the different absorption and transmittance of X-rays by different tissues, it creates tomographic images of the areas being examined. Unlike traditional multi-row detector computed tomography (CT), CBCT uses a two-dimensional digital flat panel detector. A single rotation around the body generates a three-dimensional volumetric image. CBCT also offers a smaller volumetric size and higher spatial resolution than traditional CT. To obtain more accurate anatomical and structural information and ensure the long-term stability of CBCT equipment, regular calibration and quality control are required. These calibration and quality control processes necessitate the use of multiple specialized phantoms.
[0003] However, the existing phantoms used for calibration and quality control of cone-beam X-ray computed tomography (CBCT) equipment usually require different phantoms for different calibration and testing needs. This results in fragmented functions, inconvenience in use, increased calibration and testing costs, and significantly reduced calibration and testing efficiency. Therefore, we propose an integrated phantom for CBCT quality control calibration and performance testing. Utility Model Content
[0004] The purpose of this invention is to provide an integrated phantom for CBCT quality control calibration and performance testing.
[0005] To achieve the above objectives, this utility model provides the following technical solution: an integrated phantom for CBCT quality control calibration and performance testing, comprising a geometric calibration module, wherein multiple steel balls are arranged on the outer wall of the geometric calibration module, the multiple steel balls being fixedly connected to the outer surface of the geometric calibration module in a spiral stepped manner, a CT value calibration module is threadedly connected to the left side of the geometric calibration module, a water phantom is arranged inside the CT value calibration module, a water injection hole is opened at the inner center of the water phantom, a water phantom cover is threadedly connected to the left center of the water phantom, the water phantom cover and the water injection hole are correspondingly arranged, and the CT value calibration... The left side of the calibration module is threadedly connected to a CT value linear calibration detection module. The CT value linear calibration detection module has cylinders arranged around its interior. The left side of the CT value linear calibration detection module is threadedly connected to a high-resolution detection module. Multiple metal wires are arranged inside the high-resolution detection module. The left side of the high-resolution detection module is threadedly connected to a low-contrast detection module. Multiple cylinders are arranged inside the low-contrast detection module. The left side of the low-contrast detection module is threadedly connected to a mold cover. The right side of the geometric calibration module is threadedly connected to a detection equipment connection module.
[0006] As a further embodiment of this utility model: the number of steel balls is not less than twelve, and the steel balls at the leftmost and rightmost ends are arranged on the same horizontal line.
[0007] As a further embodiment of this utility model: the plurality of cylinders are arranged in a cross shape, one of which is hollow, and the density material CT values of the plurality of cylinders are all different.
[0008] As a further embodiment of this utility model: multiple metal wires are arranged in groups with diameters ranging from small to large, and the diameter and length of each group of metal wires are different.
[0009] As a further embodiment of this utility model: multiple cylinders are arranged in radial groups, and the density and diameter of each group of cylinders are different.
[0010] As a further embodiment of this utility model: a threaded sleeve is threadedly connected to the right side of the detection equipment connection module, and a CT device is fixedly connected to the right side of the threaded sleeve.
[0011] Compared with the prior art, the beneficial effects of this utility model by adopting the above technical solution are as follows:
[0012] 1. This utility model supports the geometric calibration of the system by setting an internal geometric calibration module, which facilitates accurate imaging. It integrates quality control, calibration and quality inspection functions into one, which greatly simplifies the quality control process of cone beam X-ray computed tomography equipment, improves the ease of operation, and has a stable structure and flexible use.
[0013] 2. This utility model can complete the detection of multiple parameters such as CT value, contrast, spatial resolution, uniformity, and CT value linearity in one go, and can comprehensively evaluate the imaging performance of cone-beam X-ray computed tomography equipment, thereby improving detection efficiency and accuracy.
[0014] Other advantages, objectives and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be taught from the practice of this invention. Attached Figure Description
[0015] Figure 1 This is an overall schematic diagram of an embodiment of the present utility model;
[0016] Figure 2 This is a schematic side sectional view of the embodiment of the present utility model;
[0017] Figure 3 This is a schematic diagram showing the position of the steel column in an embodiment of this utility model;
[0018] Figure 4 This is a schematic diagram showing the location of the water injection hole in an embodiment of this utility model;
[0019] Figure 5 This is a schematic diagram showing the position of cylinder 1 in an embodiment of this utility model;
[0020] Figure 6 This is a schematic diagram showing the position of the metal wire in an embodiment of this utility model;
[0021] Figure 7 This is a schematic diagram showing the position of cylinder two in an embodiment of this utility model;
[0022] Figure 8 This is a schematic diagram of the shape of the detection device connection module in an embodiment of this utility model;
[0023] Figure 9 This is a schematic diagram of the overall assembly in an embodiment of this utility model.
[0024] In the diagram: 1. Geometric calibration module; 2. CT value calibration module; 3. CT value linear calibration detection module; 4. High resolution detection module; 5. Low contrast detection module; 6. Mold cover; 7. Detection equipment connection module; 8. Steel ball; 9. Water mold; 10. Water mold cover; 11. Cylinder 1; 12. Metal wire; 13. Cylinder 2; 14. External thread; 15. Water injection hole; 16. Threaded sleeve; 17. CT equipment. Detailed Implementation
[0025] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that the description of these embodiments is for the purpose of helping to understand this utility model, but does not constitute a limitation on this utility model.
[0026] Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.
[0027] Please see the appendix Figure 1 -Appendix Figure 8 This utility model discloses an integrated phantom for CBCT quality control calibration and performance testing, comprising a geometric calibration module 1. Multiple steel balls 8 are arranged on the outer wall of the geometric calibration module 1, and are fixedly connected to the outer surface of the geometric calibration module 1 in a spiral stepped manner. A CT value calibration module 2 is threadedly connected to the left side of the geometric calibration module 1. A water phantom 9 is disposed inside the CT value calibration module 2, with a water injection hole 15 at the center of its inner side. A water phantom cover 10 is threadedly connected to the center of the left side of the water phantom 9, and the water phantom cover 10 and the water injection hole 15 are correspondingly arranged. A CT value linear calibration detection module 3 is threadedly connected to the left side of the CT value calibration module 2 for CT value linear calibration. The detection module 3 has cylinders 11 arranged around its interior. The left side of the CT value linear calibration detection module 3 is threadedly connected to the high-resolution detection module 4. Multiple metal wires 12 are arranged inside the high-resolution detection module 4. The left side of the high-resolution detection module 4 is threadedly connected to the low-contrast detection module 5. Multiple cylinders 13 are arranged inside the low-contrast detection module 5. The left side of the low-contrast detection module 5 is threadedly connected to the mold cover 6. The right side of the geometric calibration module 1 is threadedly connected to the detection equipment connection module 7 via external threads 14. The right side of the detection equipment connection module 7 is threadedly connected to the threaded sleeve 16. The right side of the threaded sleeve 16 is fixedly connected to the CT equipment 17.
[0028] Specifically, each module is assembled sequentially according to the pre-set testing process. Then, the testing equipment connection module 7 is installed on the CT equipment 17 and the matching threaded sleeve 16 in a threaded manner for use. The equipment data is collected, calibrated, and tested. The internal geometric calibration module 1 supports the geometric calibration of the system, which facilitates accurate imaging. The quality control, calibration, and quality inspection functions are integrated into one, which greatly simplifies the quality control process of the cone-beam X-ray computed tomography imaging equipment and improves the ease of operation.
[0029] In Example 1, the number of steel balls 8 is not less than twelve, and the leftmost and rightmost steel balls 8 are arranged on the same horizontal line;
[0030] Specifically, the multiple steel balls 8 are arranged in a spiral shape to avoid occlusion between them during the imaging process. Since the attenuation coefficients of the steel balls 8 and the geometric calibration module 1 for X-rays are different, the steel balls 8 can be effectively distinguished from the geometric calibration module 1 during the imaging process. The geometric calibration of the system is performed by calculating the correspondence between the known position coordinates of the steel balls 8 in the geometric calibration module 1 and the position coordinates of the steel balls 8 in the image obtained during the imaging process.
[0031] In Example 2, multiple cylinders 11 are arranged in a cross shape, one of which is hollow, and the density material CT values of the multiple cylinders 11 are different.
[0032] Specifically, the CT value linear calibration detection module 3 is equipped with three cylinders 11 of different material densities and one hollow cylinder 11. Multiple cylinders 11 are distributed in the X and Y directions. Different materials have different attenuation coefficients for X-rays, and the corresponding CT values are also different. Therefore, the linear calibration process is to perform calibration by linearly fitting and mapping the actual measured CT values of different materials with theoretical standard CT values.
[0033] In Example 3, multiple metal wires 12 are arranged in groups with increasing diameters, and the diameter and length of each group of metal wires 12 are different.
[0034] Specifically, spatial resolution is detected by imaging the high-resolution detection phantom 4 and observing the smallest resolvable diameter between the metal wires 12. Since the metal wires 12 and the main structure of the high-resolution detection module 4 have different material densities and different attenuation of X-rays, they can be effectively distinguished during the imaging process.
[0035] In Example 4, multiple cylinders 2 13 are arranged in radial groups, and the density and diameter of each group of cylinders 2 13 are different;
[0036] Specifically, because materials of different densities have different attenuation coefficients for X-rays, the corresponding CT values are also different. Therefore, cylinders of different densities are used to detect the minimum resolvable contrast.
[0037] Working principle:
[0038] First, the modules are assembled sequentially according to the pre-set testing procedure. Then, the testing equipment connection module 7 is threadedly installed onto the matching threaded sleeve 16 of the CT equipment 17 for data acquisition, calibration, and testing. Subsequently, the system accuracy of the equipment is calibrated using the equipment scanning geometric calibration module 1. The steel balls 8 embedded on the outer wall of the geometric calibration module 1 are arranged in a spiral pattern to prevent occlusion between the steel balls 8 during the imaging process. For example, when there are 13 steel balls 8, the angular interval between each steel ball 8 is 30 degrees; when there are 19 steel balls 8, the angular interval between each steel ball 8 is 20 degrees. The steel balls 8 are embedded in the geometric calibration module... 1. Outer wall: The radius of the outer wall of the geometric calibration module 1 is the helical radius of the spiral steel balls 8. Holes are made in the outer wall of the geometric calibration module 1 to embed the steel balls 8. During embedding, a small amount of glue can be applied to the surface of the steel balls 8 to reinforce them and prevent them from falling off. Since the attenuation coefficients of the steel balls 8 and the geometric calibration module 1 for X-rays are different, the steel balls 8 can be effectively distinguished from the geometric calibration module 1 during the imaging process. The geometric calibration of the system is performed by calculating the correspondence between the known position coordinates of the steel balls 8 in the geometric calibration module 1 and the position coordinates of the steel balls 8 in the image obtained during the imaging process. The main material of the geometric calibration module 1 can be nylon or plexiglass.
[0039] The CT value calibration module 2 performs CT value calibration and uniformity detection. Since the CT value calibration module 2 has no sealing structure, it is plugged with a threaded water mold cover 10 to prevent water leakage. The thickness of the water mold cover 10 is 2mm to 6mm. The main body material of this module is plexiglass or nylon. Since the standard CT value of water is 0, water is usually used to calibrate the CT value. The actual CT value of water is mapped to 0 through the data of the water mold 9 for calibration.
[0040] The CT value linear calibration and detection module 3 performs linear calibration and detection. This module includes three cylinders (11) with different material densities and CT values, and one hollow cylinder (11). These cylinders can be made of Teflon (Teflon) with a standard CT value of 990, or acrylic (Acrylic). The standard CT value of lic is 120, the standard CT value of low-density polyethylene (LDPE) is -100, the standard CT value of air is -1000, or other materials with known CT values can be used. Holes are made in the foam material, solid water, or other low-density materials, and cylinders with different density materials and CT values (11) are inserted. Hollow cylinders (11) can be made directly. The placement order of multiple cylinders (11) is not limited. Multiple cylinders (11) can be distributed in the X and Y directions. Different density materials have different attenuation coefficients for X-rays, and the corresponding CT values are also different. Therefore, the linear calibration process is to perform calibration by linearly fitting and mapping the actual measured CT values of different density materials with the theoretical standard CT values. The main material of the CT value linear calibration detection module 3 can be nylon or plexiglass.
[0041] The high-resolution detection module 4 is used to detect the spatial resolution of the imaging equipment system. Multiple metal wires 12 on the high-resolution detection module 4 have diameters ranging from 0.1mm to 1mm. There are 4 to 5 metal wires 12 of each diameter, and each metal wire 12 has a length of 40mm to 50mm. The center-to-center distance between metal wires 12 of each diameter is twice the diameter of the corresponding metal wire 12, meaning the spacing is equal to the diameter of each diameter metal wire 12. The arrangement order can be from smallest to largest diameter in each group, or there can be no specific positional order restriction. The metal wires 12 can be inserted into resin, plexiglass, or other low-density materials. By imaging the high-resolution detection phantom 4, the minimum resolvable diameter between the metal wires 12 is observed to detect the spatial resolution. Because the material density of the metal wires 12 and the main structure of the high-resolution detection module 4 is different, their attenuation of X-rays is different, thus effectively distinguishing them during imaging. The main material of the high-resolution detection module 4 can be plexiglass or resin.
[0042] The low-contrast detection module 5 is used to detect the low contrast resolution of the imaging equipment system. This module contains multiple cylinders 13, each with a different density and diameter. The cylinders 13 are differentiated by incorporating fillers of varying densities into a specially formulated polymer or epoxy resin. The cylinders 13 can be arranged radially. The outermost ring offers four contrast levels: 0.1%, 0.3%, 0.5%, and 1%, with diameters of 9mm, 7mm, 5mm, and 3mm respectively. The middle ring offers four contrast levels: 0.1%, 0.3%, 0.5%, and 1%. %, 1%, with diameters of 7mm, 5mm, 3mm, and 1mm. The inner ring has four contrast ratios: 0.1%, 0.3%, 0.5%, and 1%, with diameters of 5mm, 3mm, 1mm, and 0.3mm. Holes are made in epoxy resin or other low-density materials to insert them. Because materials of different densities have different X-ray attenuation coefficients, the corresponding CT values are also different. Therefore, cylinders of different densities are set to detect the minimum resolvable contrast. The main body material of the scanning low-contrast detection module 5 can be plexiglass or nylon. At this point, the entire workflow is complete.
[0043] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.
[0044] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.
[0045] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments.
[0046] For those skilled in the art, various changes, modifications, substitutions, and alterations to these embodiments without departing from the principles and spirit of this utility model will still fall within the protection scope of this utility model.
Claims
1. An integrated phantom for CBCT quality control calibration and performance testing, comprising a geometric calibration module (1), characterized in that: The outer wall of the geometric calibration module (1) is provided with multiple steel balls (8), which are fixedly connected to the outer surface of the geometric calibration module (1) in a spiral stepped manner. The left side of the geometric calibration module (1) is threadedly connected to a CT value calibration module (2). The CT value calibration module (2) is provided with a water model (9) inside. A water injection hole (15) is opened at the center of the inner side of the water model (9). A water model cover (10) is threadedly connected to the center of the left side of the water model (9). The water model cover (10) and the water injection hole (15) are correspondingly set. The left side of the CT value calibration module (2) is threadedly connected to a CT value linear calibration detection module (3). The T-value linear calibration detection module (3) has cylinders (11) arranged around its interior. The left side of the T-value linear calibration detection module (3) is threadedly connected to a high-resolution detection module (4). The inner side of the high-resolution detection module (4) is provided with multiple metal wires (12). The left side of the high-resolution detection module (4) is threadedly connected to a low-contrast detection module (5). The inner side of the low-contrast detection module (5) is provided with multiple cylinders (13). The left side of the low-contrast detection module (5) is threadedly connected to a mold cover (6). The right side of the geometric calibration module (1) is threadedly connected to a detection equipment connection module (7) via an external thread (14).
2. The integrated phantom for CBCT quality control calibration and performance testing according to claim 1, characterized in that: The number of steel balls (8) is not less than twelve, and the steel balls (8) at the leftmost and rightmost ends are arranged on the same horizontal line.
3. The integrated phantom for CBCT quality control calibration and performance testing according to claim 1, characterized in that: Multiple cylinders (11) are arranged in a cross shape, one of which is hollow, and the density material CT values of the multiple cylinders (11) are different.
4. The integrated phantom for CBCT quality control calibration and performance testing according to claim 1, characterized in that: Multiple metal wires (12) are arranged in groups with increasing diameters, and the diameter and length of each group of metal wires (12) are different.
5. The integrated phantom for CBCT quality control calibration and performance testing according to claim 1, characterized in that: Multiple cylinders (13) are arranged in radial groups, and the density and diameter of each group of cylinders (13) are different.
6. The integrated phantom for CBCT quality control calibration and performance testing according to claim 1, characterized in that: The right side of the detection equipment connection module (7) is threadedly connected to a threaded sleeve (16), and the right side of the threaded sleeve (16) is fixedly connected to a CT device (17).