A phantom device for detecting ct penetration performance

Abstract

The utility model relates to CT detection technical field especially relates to a kind of phantom device that can detect CT penetration performance, including shell assembly and detection core assembly;The shell assembly is spliced by positive cover plate, side cover plate, square end cap, and closed cavity for accommodating detection core assembly is formed inside;The detection core assembly includes ladder bar and copper bar, and the ladder bar is multilayer ladder-shaped cylinder, and the through-hole for embedding copper bar is set in the center.This phantom device is set by ladder bar, and the penetration test scene of multiple gears is provided by the thickness change of layer by layer through ladder-shaped structure, and then the resolving power of CT equipment to different thickness difference can be quantitatively evaluated, and the detection precision is improved compared with conventional phantom.

Description

Technical Field

[0001] This utility model relates to the field of CT detection technology, and in particular to a phantom device for detecting CT penetration performance. Background Technology

[0002] CT (Computed Tomography) technology is a technique that uses X-rays to penetrate objects and receive the transmitted rays through a detector. A computer then reconstructs a three-dimensional image of the object's interior. Its penetration performance (the ability to detect the density and thickness range of a product) is a core indicator of CT security inspection machines. It characterizes the density and thickness range of products that the CT equipment can detect, directly affecting its ability to effectively inspect specific products. To accurately assess the penetration performance of CT equipment, specialized inspection phantoms are required. Existing phantoms often use a single structure or a material of fixed thickness, making it difficult to precisely quantify the penetration effect on objects of different densities and thicknesses, resulting in insufficient accuracy and standardization of the inspection results. Therefore, there is an urgent need for a structurally stable phantom device with high detection accuracy to achieve precise evaluation of the penetration performance of CT equipment. Utility Model Content

[0003] This invention addresses the shortcomings of existing technologies where phantoms are difficult to precisely quantify the penetration effect of objects with different densities and thicknesses, resulting in insufficient accuracy and standardization of test results. It provides a phantom device that can detect CT penetration performance.

[0004] This utility model is achieved through the following technical solution:

[0005] A phantom device for detecting CT penetration performance includes a housing assembly and a detection core assembly;

[0006] The outer shell assembly is composed of a front cover plate, a side cover plate, and a square end cap, forming an internal closed cavity for accommodating the core detection component. There are two front cover plates, two side cover plates, and two square end caps, which are assembled into a rectangular closed cavity.

[0007] The core testing components include a stepped rod and a copper rod. The stepped rod is a multi-layered stepped cylinder with a through hole in the center for embedding the copper rod. The stepped structure provides multiple penetration test scenarios through the gradual change in thickness of each layer.

[0008] In a preferred embodiment of this utility model, the side cover plate and the front cover plate are spliced ​​together by a convex tenon and mortise structure, and a positioning groove is provided at the connection, which improves the assembly accuracy of the outer shell components and makes its error ≤0.1mm.

[0009] In a preferred embodiment of this utility model, the minimum layer diameter of the stepped rod is 30mm to 40mm, and the diameter of each layer increases by 1mm to 3mm, for a total of 4 to 7 layers, which can accurately reflect the difference in the penetration ability of CT equipment to minute thickness variations.

[0010] In a preferred embodiment of this utility model, the stepped bar is made of one of the following materials: SUS304 stainless steel, Q235 steel, 45 steel, and 40Cr steel.

[0011] In a preferred embodiment of this utility model, the stepped bar is fixed to the square end cap by connecting bolts, and threaded holes for fixing are provided on both ends of the stepped bar. The connecting bolts are inserted into the threaded holes to fix the stepped bar.

[0012] In a preferred embodiment of this utility model, the copper rod has a diameter of 3-5 mm and is made of pure copper.

[0013] In a preferred embodiment of this utility model, the outer shell assembly uses materials with a density ≤1.2g / cm³. 3 It is made of materials that are easily penetrated by X-rays.

[0014] In a preferred embodiment of this utility model, a snap-fit ​​groove for positioning the copper rod is provided on the inner wall of the square end cap.

[0015] The beneficial effects of this utility model are:

[0016] 1. By setting up a stepped bar, the stepped structure provides multiple penetration test scenarios through layer-by-layer thickness changes, thereby quantitatively evaluating the CT equipment's ability to distinguish different thickness differences, which improves the detection accuracy compared to conventional solid-state models.

[0017] 2. The front cover plate and side cover plate in this device are connected by a convex splicing structure and positioning slots, which improves the assembly accuracy of the outer shell components and avoids deviations in test results due to structural loosening. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a phantom device for detecting CT penetration performance according to the present invention.

[0019] Figure 2 This is a schematic diagram of the convex-shaped splicing structure of the side cover plate and the front cover plate of a phantom device for detecting CT penetration performance according to the present invention.

[0020] Figure 3 This is an axial sectional view of the stepped rod in a phantom device for detecting CT penetration performance according to this utility model.

[0021] In the diagram: 1. Front cover plate; 2. Side cover plate; 3. Square end cover; 31. Snap-fit ​​groove; 4. Stepped bar; 5. Copper bar; 6. Connecting bolt. Detailed Implementation

[0022] The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings, so that the advantages and features of this utility model can be more easily understood by those skilled in the art, thereby providing a clearer and more definite definition of the scope of protection of this utility model. The directional terms mentioned in this utility model, such as "up," "down," "front," "back," "left," "right," "top," and "bottom," are only for reference to the accompanying drawings. Therefore, the directional terms used are for the purpose of explaining and understanding this utility model, and not for limiting this utility model.

[0023] like Figure 1-3 The phantom device shown includes a housing assembly and a detection core assembly for detecting CT penetration performance.

[0024] The outer shell assembly is composed of a front cover plate 1, a side cover plate 2, and a square end cap 3, forming an internal closed cavity for accommodating the core detection component. There are two of each of the three components: the front cover plate 1, the side cover plate 2, and the square end cap 3, assembled into a cuboid-shaped closed cavity. The outer shell assembly uses a material with a density ≤1.2 g / cm³. 3 Made of materials that are easily penetrated by X-rays, such as black acrylic sheets, the side cover 2 and the front cover 1 are spliced ​​together by a convex tenon and mortise structure, and a positioning slot is set at the connection point to improve the assembly accuracy of the outer shell components, so that the error is ≤0.1mm.

[0025] The core testing components include a stepped rod 4 and a copper rod 5. The stepped rod 4 is a multi-layered stepped cylinder with a central through-hole for embedding the copper rod 5. The stepped rod 4 is made of a material that is not easily penetrated, and the minimum layer diameter of the stepped rod 4 is 30mm to 40mm, with each layer increasing in diameter by 1mm to 3mm, for a total of 4 to 7 layers. For example, it can be made of one of the following materials: SUS304 stainless steel, Q235 steel, No. 45 steel, or 40Cr steel. The optimal wall thickness for the stepped rod 4 is within the range of 8mm to 15mm. The cumulative increase of 1mm in wall thickness for each layer can better distinguish the penetration performance of CT. For example, if the minimum diameter of the stepped rod 4 is 36mm, with each layer increasing by 2mm, for a total of 5 layers, the maximum diameter of the largest ring is 44mm. The stepped structure provides multiple penetration test scenarios through the gradual change in thickness of each layer. The design of the stepped rod 4, with a 1mm gradient in wall thickness and a 2mm gradient in diameter, can accurately reflect the differences in the penetration ability of CT equipment to minute changes in thickness.

[0026] The stepped rod 4 is fixed to the square end cap 3 by connecting bolts 6, and threaded holes for fixing are opened on both ends of the stepped rod 4. The connecting bolts 6 are inserted into the threaded holes to fix the stepped rod 4.

[0027] Specifically, the copper rod 5 has a diameter of 3-5mm and is made of pure copper. The inner wall of the square end cap 3 is provided with a snap-fit ​​groove 31 for positioning the copper rod 5. When installing, the copper rod 5 is inserted into the stepped rod 4 to ensure that the copper rod 5 and the stepped rod 4 are coaxially set. At the same time, both ends of the copper rod 5 are respectively inserted into the snap-fit ​​grooves 31 on the inner wall of the square end cap 3 on both sides.

[0028] In this embodiment, during the assembly process, the front cover plate 1 and the side cover plate 2 are spliced ​​together through a U-shaped slot, and the square end cover 3 is fixed to form a sealed cavity. The stepped rod 4 is placed in the center to ensure that the copper rod 5 and the stepped rod 4 are coaxial, so that the mold assembly is completed. The mold device is placed in the CT scanning area, and the penetration effect of different wall thickness areas is analyzed by scanning images to evaluate the performance of the CT equipment. The stepped structure provides multiple penetration test scenarios through layer-by-layer thickness changes, thereby quantitatively evaluating the CT equipment's ability to distinguish different thickness differences, which improves the detection accuracy compared to conventional molds.

[0029] It should be noted that the parts not covered by this utility model are the same as or can be implemented using existing technology.

[0030] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "setting," "provided," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a screw connection, a snap-fit ​​connection, or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A phantom device for detecting CT penetration performance, characterized in that: Including the outer casing and the core detection components; The outer shell assembly is assembled from a front cover plate (1), a side cover plate (2), and a square end cap (3), forming an internal closed cavity for accommodating the core detection component; The detection core component includes a stepped rod (4) and a copper rod (5). The stepped rod (4) is a multi-layered stepped cylinder with a through hole in the center for embedding the copper rod (5). The stepped rod (4) is fixed to the square end cap by connecting bolts (6), and threaded holes for fixing are provided on both ends of the stepped rod (4), and the connecting bolts (6) are inserted into the threaded holes.

2. The phantom device for detecting CT penetration performance according to claim 1, characterized in that: The side cover plate (2) and the front cover plate (1) are spliced ​​together by a convex tenon and mortise structure, and a positioning slot is provided at the connection.

3. The phantom device for detecting CT penetration performance according to claim 1, characterized in that: The minimum layer diameter of the stepped rod (4) is 30mm to 40mm, and the diameter of each layer increases by 1mm to 3mm, for a total of 4 to 7 layers. The wall thickness of the stepped rod (4) is 8mm to 15mm.

4. The phantom device for detecting CT penetration performance according to claim 3, characterized in that, The stepped bar (4) is made of one of the following materials: SUS304 stainless steel, Q235 steel, No. 45 steel, or 40Cr steel.

5. The phantom device for detecting CT penetration performance according to claim 1, characterized in that: The copper rod (5) has a diameter of 3-5 mm and is made of pure copper.

6. The phantom device for detecting CT penetration performance according to claim 1, characterized in that: The outer shell assembly is made of a material with a density ≤1.2g / cm³ that is easily penetrated by X-rays.

7. The phantom device for detecting CT penetration performance according to claim 1, characterized in that, The inner wall of the square end cap (3) is provided with a snap-fit ​​groove (31) for positioning the copper rod (5).

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