An anti-scattering grid component capable of realizing dual-energy collection

Abstract

The present invention belongs to the field of CT technology, and in particular, relates to an anti-scatter grid assembly capable of realizing dual-energy acquisition, including an anti-scatter grid, which is an integrally formed mesh grid, including a cross-composed transverse grid sheet and a longitudinal grid sheet, both of which are tilted in a focusing manner, and the bottom of the anti-scatter grid is provided with inverted U-shaped grooves spaced longitudinally; a filter sheet, which is in the shape of a long strip and embedded and fixed in the inverted U-shaped groove at the bottom of the anti-scatter grid; an upper cover plate, which covers and is fixed on the top of the anti-scatter grid; and a lower cover plate, which covers and is fixed on the bottom of the anti-scatter grid. It not only realizes efficient scattered ray absorption and enables the detection plate to realize the acquisition of high and low energy data, but also greatly simplifies the structural design, improves the processing accuracy and assembly efficiency; the integrally formed mesh grid design, combined with the special inverted U-shaped groove structure, not only improves the overall strength, but also provides a precise installation space for the filter sheet.

Description

Technical Field

[0001] The invention belongs to the field of CT technology, and in particular relates to an anti-scatter grid assembly. Background Art

[0002] Dual-energy CT is often used in the CT field. There are generally two ways to achieve it: one is a dual-energy ray source with a single-energy detector, and the other is a single-energy ray source with a dual-energy detector. The latter is a more economical and commonly used method, which makes the development of dual-energy detectors inevitable. Currently, the implementation methods of dual-energy detectors are: A ray filter is set between the two layers of detection plates (detection plates: including PD plates and scintillators, with scintillators arrayed on the PD plates) to form a "sandwich" structure. The top detection plate receives low-energy rays and converts them into electrical signals. After the rays pass through the filter, high-energy rays are obtained, which are then received by the lower detection plate and converted into electrical signals, thereby obtaining the original data scanned under two different energy spectrum distributions.

[0003] Alternatively, a single-layer detection plate is used, and a fixed plate is set above the scintillator of the detection plate. Radiation filters are arranged at intervals on the fixed plate, and the arrangement positions of the radiation filters and the scintillators correspond to each other. The scintillators not covered by the radiation filters receive low-energy radiation, while the scintillators covered by the radiation filters receive high-energy radiation, thereby realizing dual-energy data collection.

[0004] However, there are still some problems with the existing dual-energy detector technology. For example, CN113252714A discloses a dual-energy CT detector with a filtering and anti-scattering structure, which adopts a double-layer detection board solution with a "sandwich" structure. Although this solution can achieve dual-energy imaging, the use of two layers of detection boards greatly increases the cost of the whole machine and maintenance costs. In addition, this structure also increases the complexity of the system, which may affect the stability and reliability of the system.

[0005] On the other hand, CN211826557U describes a high- and low-energy anti-scatter combination device and a dual-energy CT system. This technology adopts a single-layer detection plate plus a fixed plate. Ray filters are arranged at intervals on the fixed plate to achieve high and low energy data acquisition. However, this scheme has some technical difficulties. First, the fixed plate usually uses low-density materials (such as carbon fiber or polyester materials) to ensure high radiation transmittance, but this type of material is soft and it is difficult to ensure processing accuracy. Secondly, in order to maximize the radiation transmittance, the thickness of the fixed plate needs to be as thin as possible, which can easily cause the fixed plate to deform after processing, thereby affecting the assembly accuracy. Finally, this structure also faces problems such as large cumulative positioning errors and high difficulty in assembly process, resulting in a low yield rate.

[0006] In addition, although the anti-scattering grid of a CT detector disclosed in CN117064422A solves the scattered ray problem to a certain extent, it has a complex structure, high manufacturing cost, and is difficult to achieve effective separation of high-energy and low-energy rays. Summary of the invention

[0007] In the face of these problems, there is an urgent need for a new type of anti-scatter grid component that can not only realize dual-energy CT imaging, but also effectively solve the influence of scattered rays, while also simplifying the structure, reducing costs, and improving processing accuracy and assembly efficiency.

[0008] The embodiment of the present invention adopts the following technical solution: an anti-scattering grid component capable of realizing dual-energy acquisition, comprising: An anti-scattering grid, the anti-scattering grid is an integrally formed mesh grid, comprising a cross-formed transverse grid sheet and a longitudinal grid sheet, the transverse grid sheet and the longitudinal grid sheet are both inclined in a focusing manner, and the bottom of the anti-scattering grid is provided with inverted U-shaped grooves spaced apart in the longitudinal direction; A filter, which is in the shape of a long strip and is embedded and fixed in the inverted U-shaped groove at the bottom of the anti-scattering grid; An upper cover plate, the upper cover plate covers and is fixed on the top of the anti-scattering grid; A lower cover plate, the lower cover plate covers and is fixed to the bottom of the anti-scatter grid; The bottom grids of the anti-scattering grid correspond one-to-one to the scintillators on the detection plate, and the inverted U-shaped grooves cover part of the scintillators at intervals in the longitudinal direction.

[0009] Preferably, the cross section of the transverse grid sheet comprises: A top portion 1, wherein the top portion 1 is thinner and longer; a middle portion, wherein the thickness of the middle portion is greater than that of the top portion 1 and the length of the middle portion is less than that of the top portion 1; The root portion 1 has a side surface that is concave inwardly formed into an inverted L-shaped structure, and the inverted L-shaped structures of two adjacent transverse grid pieces are opposite to each other to form the inverted U-shaped groove.

[0010] Preferably, the cross section of the longitudinal grid sheet comprises: A second top portion, wherein the second top portion is thinner and longer; A second root portion, wherein the second root portion has a thickness greater than that of the second top portion and a length less than that of the second top portion; Among them, the root two sizes of any cross section of a single longitudinal grid piece are different, the root two of the cross section located at the inverted U-shaped groove is shorter, and the root two located at the non-inverted U-shaped groove is longer.

[0011] Preferably, the plane projection shape of the longitudinal grid sheet is a rectangular sheet, and the inverted U-shaped grooves are distributed at intervals at the bottom.

[0012] Preferably, two bosses extend from the bottom of the outermost longitudinal grid piece of the anti-scatter grid, each of the bosses is provided with two parallel ribs, the ribs connect the bosses and the grid outer wall, and the bosses on both sides are provided with positioning holes and connecting holes.

[0013] Preferably, the inverted U-shaped groove further comprises: A small inverted U-shaped groove is located at the top corner of the groove and cut upward along the side wall of the groove. The height of the small inverted U-shaped groove is 0.2-0.4mm and the width is 0.4-0.6mm.

[0014] Preferably, the length, width and height of the filter are consistent with the size of the bottom groove of the anti-scatter grid, and the filter is glued and fixed to the top surface and side walls of the inverted U-shaped groove.

[0015] Preferably, the upper cover plate and the lower cover plate are both rectangular sheets, covering all grid holes of the anti-scattering grid.

[0016] Preferably, the anti-scattering grid is made of high-density material, the scintillator on the detection plate covered by the inverted U-shaped groove is a high-energy scintillator, and the scintillator not covered by the inverted U-shaped groove is a low-energy scintillator.

[0017] As a preference, it also includes: A detection board, the detection board comprising a scintillator and a photodiode board distributed in an array; A substrate, the substrate is used to install and fix the anti-scatter grid assembly and the detection plate, the upper surface of the substrate is provided with a plurality of bosses as the installation surface of the anti-scatter grid assembly and the detection plate, and the lower surface is a plane and is provided with a plurality of connection holes; A heat sink, the heat sink is mounted on the bottom of the substrate; The bracket is installed on the bottom surface of the base plate, with flanges on both sides and a plurality of circular holes opened on the flanges along the longitudinal direction.

[0018] At least one of the above technical solutions adopted in the embodiments of the present invention can achieve the following beneficial effects: The anti-scattering grid assembly of the present invention cleverly solves the above technical problems through innovative structural design. It not only achieves efficient scattered ray absorption and separation of high- and low-energy rays, but also greatly simplifies the structural design and improves processing accuracy and assembly efficiency. In particular, the one-piece mesh grid design of the present invention, combined with a special inverted U-shaped groove structure, not only improves the overall strength, but also provides a precise installation space for the filter, effectively solving the positioning error problem in the prior art.

[0019] In addition, the design of the present invention also has a significant synergistic effect. For example, the special cross-sectional design of the anti-scatter grid not only provides a mounting surface for the filter, but also effectively separates adjacent scintillators and absorbs scattered rays. The design of the upper and lower covers not only prevents dust from entering, but also further enhances the overall strength. This multifunctional structural design greatly improves the overall performance and reliability of the system.

[0020] In general, the anti-scatter grid assembly of the present invention significantly improves the imaging quality while achieving dual-energy CT imaging, and reduces production costs and maintenance difficulties. This comprehensive technological breakthrough provides new possibilities for improving the performance of CT systems and expanding clinical applications, and has important practical value and broad market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 is a three-dimensional diagram of an anti-scatter grid assembly of the present invention; Figure 2 An exploded view of the anti-scatter grid assembly of the present invention; Figure 3 is a cross-sectional view of the anti-scatter grid assembly of the present invention; Figure 4 is a three-dimensional diagram of the anti-scatter grid of the present invention; Figure 5 is a side view of the anti-scatter grid of the present invention; Figure 6 is a top view of the anti-scatter grid of the present invention; Figure 7 is a cross-sectional view of the anti-scatter grid of the present invention; Figure 8 is an enlarged cross-sectional view of the anti-scattering grid of the present invention; Fig. 9 is a longitudinal cross-sectional view of the anti-scatter grid of the present invention; Fig.10 A cross-sectional view of a transverse grid sheet of the present invention; Fig.11 It is an enlarged cross-sectional view of a transverse grid sheet of the present invention; Fig.12 is a cross-sectional view of the anti-scatter grid of the present invention; Fig.13 is a cross-sectional view of a longitudinal grid piece of the anti-scatter grid of the present invention; Fig.14 It is an enlarged view of the longitudinal grid piece cross section of the anti-scattering grid of the present invention; Fig.15It is a plane projection shape diagram of the longitudinal grid sheet of the present invention; Fig.16 It is a plane projection shape diagram of the concave-shaped longitudinal grid sheet of the present invention; Fig.17 It is a comparison diagram of the inverted U-shaped notch and the concave notch of the present invention; Fig.18 The corresponding relationship diagram between the grid and the scintillator and its cross-sectional diagram; Fig.19 is a cross-sectional view of the grid and the scintillator; Fig. 20 A three-dimensional diagram of a module of the present invention; Fig.21 It is a side view of a module of the present invention; Fig. 22 is a three-dimensional diagram of the bracket of the present invention; Fig.23 It is a schematic diagram of the structure of the CT system of the present invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] The present invention provides an anti-scatter grid component capable of realizing dual-energy acquisition, which is mainly used in CT systems to realize dual-energy imaging and reduce the influence of scattered rays, thereby improving imaging quality. The present invention will be described in detail below in conjunction with specific embodiments.

[0024] like Figure 1-Figure 23 As shown, the anti-scatter grid assembly 5 of the present invention comprises an anti-scatter grid 1, a filter 2, an upper cover plate 3 and a lower cover plate 4. These components work together to achieve efficient scattered ray absorption and high- and low-energy ray separation.

[0025] The anti-scatter grid 1 is a core component of the present invention. Preferably, the anti-scatter grid 1 is an integrally formed mesh grid, including a cross-formed transverse grid sheet 11 and a longitudinal grid sheet 12. This integrally formed design not only improves the overall structural strength, but also facilitates processing and manufacturing, which is beneficial to improving product precision. In one embodiment of the present invention, the transverse grid sheet 11 and the longitudinal grid sheet 12 are both focused and tilted. This focused tilt design fully considers the conical divergence characteristics of X-rays and can significantly improve imaging quality.

[0026] It is worth noting that the bottom of the anti-scatter grid 1 is longitudinally spaced with inverted U-shaped grooves 13. These inverted U-shaped grooves 13 play a key role in the present invention, providing installation space for the filter 2 and are important structures for separating high-energy and low-energy rays.

[0027] The filter 2 is another important component of the present invention. The present invention uses a long strip filter 2, which is cleverly embedded and fixed in the inverted U-shaped groove 13 at the bottom of the anti-scatter grid 1. This design not only simplifies the structure, but also improves the positioning accuracy of the filter 2 and reduces the cumulative error. In practical applications, the filter 2 is usually made of materials such as copper or aluminum, which can effectively filter out low-energy rays.

[0028] In order to further improve the overall performance of the anti-scatter grid assembly, the present invention also designs an upper cover plate 3 and a lower cover plate 4. The upper cover plate 3 covers and is fixed to the top of the anti-scatter grid 1, while the lower cover plate 4 covers and is fixed to the bottom of the anti-scatter grid 1. This design not only prevents dust from entering and affecting imaging, but also further improves the strength of the anti-scatter grid assembly.

[0029] Reference Figure 18-Figure 19 , wherein the bottom grid of the anti-scattering grid 1 corresponds one-to-one to the scintillator on the detection plate 6, and the inverted U-shaped grooves 13 cover part of the scintillator at intervals in the longitudinal direction.

[0030] The scintillator on the detection plate 6 covered by the inverted U-shaped groove 13 is a high-energy scintillator 61 , and the scintillator not covered by the inverted U-shaped groove is a low-energy scintillator 62 .

[0031] Furthermore, the present invention optimizes the cross-sectional structure of the transverse grid sheet 11. Fig.11 As shown, the cross section of the transverse grid sheet 11 includes a top portion 111, a middle portion 112 and a root portion 113. Among them, the top portion 111 is thinner and longer, and the top portion 111 is longer in order to absorb as much of the scattered rays as possible; since the upper portion is longer, if the grid holes are smaller, the assembly and manufacturing accuracy of the ray source and the detector are required to be high, so the thickness of the upper portion is reduced, the grid holes are enlarged, and the accuracy requirements are reduced. Because the grid holes are thin and long slits, the angles of the probe ray source and the detector must be very accurate to allow the incident rays to illuminate the scintillator in each grid, otherwise the angle or position is slightly crooked, and the actual light-receiving area of ​​each small scintillator will be small; The wall thickness of the middle part 112 is increased, and the grid holes become smaller. When the rays enter the middle grid, only the rays required by a single scintillator are retained, and the stray scattered rays at non-incident angles are further filtered out; the middle part 112 becomes thicker, which improves the grid strength and provides an installation and positioning surface for the filter; although the grid holes in the middle part 112 are smaller, they are shorter, and the requirements for the installation and positioning accuracy of the CT system are relatively low, which can ensure that the existing processing level can meet the requirements.

[0032] Simply put, for the scintillator, what it needs is a straight ray that reaches it in a straight line from the light source of the ray source, but there will be rays from other angles that can reach the scintillator, which will cause erroneous data in the CT image and form image artifacts. We call this scattered rays, which are different from straight rays. The purpose of the grid is to absorb scattered rays. The thickness of the middle part 112 is greater than the top 111 and the length is less than the top 111, which increases the structural strength. In particular, one side of the root 113 is concave to form an inverted L-shaped structure 114. The inverted L-shaped structures 114 of two adjacent lateral grid plates 11 are opposite to each other, and together form the aforementioned inverted U-shaped groove 13. This special cross-sectional design not only provides a positioning and mounting surface for the filter 2, but also effectively separates the incident rays between adjacent scintillators and absorbs scattered rays in adjacent grid holes.

[0033] In another embodiment of the present invention, Fig.13 As shown, the cross section of the longitudinal grid sheet 12 has also been carefully designed. The cross section of the longitudinal grid sheet 12 also includes a top portion 121 and a root portion 122. The top portion 121 is thinner and longer, while the root portion 122 is thicker than the top portion 121 and shorter than the top portion 121. This design ensures structural strength while absorbing as much scattered light as possible. The principle is the same as that of the transverse grid sheet 11. It is worth mentioning that the size of the root portion 122 of any cross section of a single longitudinal grid sheet 12 is not the same. The root portion of the cross section located at the inverted U-shaped groove 13 is shorter, while the root portion located at the non-inverted U-shaped groove is longer. This variable root design not only ensures the installation space of the filter sheet 2, but also maximizes the absorption effect of scattered light.

[0034] Through the above-mentioned design, the anti-scatter grid assembly of the present invention effectively solves the problem of the influence of scattered rays while realizing dual-energy CT imaging. This assembly not only improves the imaging quality, but also reduces the production cost and maintenance difficulty to a certain extent. This comprehensive technological breakthrough makes the present invention have high practical value and industrialization potential. In a preferred embodiment of the present invention, the plane projection shape of the longitudinal grid sheet 12 is a rectangular sheet, and inverted U-shaped grooves 13 are distributed at intervals at the bottom. This design not only simplifies the processing technology, but also ensures the overall structural strength of the anti-scatter grid 1. It is worth noting that the rectangular sheet design enables the longitudinal grid sheet 12 to be evenly distributed, effectively absorbing scattered rays in all directions.

[0035] The present invention further optimizes the structural design of the anti-scattering grid 1. Figure 2As shown, two bosses 14 extend from the bottom of the outermost longitudinal grid sheet 12 of the anti-scatter grid 1. Two parallel ribs 15 are cleverly arranged on each boss 14. These ribs 15 connect the bosses 14 and the outer wall of the grid, significantly enhancing the stability of the overall structure. In particular, both side bosses 14 are provided with positioning holes and connecting holes. The positioning holes are used to accurately locate the position of the anti-scatter grid assembly in the CT system, while the connecting holes facilitate connection and fixation with other components. This design greatly improves the installation accuracy and convenience of the anti-scatter grid assembly.

[0036] In order to further improve the processing accuracy and use effect of the anti-scatter grid 1, the present invention has made innovations in the design of the inverted U-shaped groove 13. The inverted U-shaped groove 13 also includes a small inverted U-shaped groove located at the top corner of the groove and cut upward along the side wall of the groove. Preferably, the height of the small inverted U-shaped groove 18 is 0.2~0.4mm and the width is 0.4~0.6mm. This design cleverly solves the problem of inner corners that may occur during the processing process, ensuring that the filter plate 2 can be completely fitted with the top surface of the groove, thereby improving the installation accuracy and stability of the filter plate 2.

[0037] In another embodiment of the present invention, the length, width and height of the filter 2 are precisely matched with the size of the bottom groove of the anti-scatter grid 1. Preferably, the filter 2 is fixed to the top surface and side wall of the inverted U-shaped groove 13 by gluing. This design not only ensures the installation stability of the filter 2, but also improves the efficiency of separating high-energy and low-energy rays. In practical applications, the material of the filter 2 can be selected according to specific needs. Commonly used materials include copper, aluminum, etc. These materials can effectively filter out low-energy rays while ensuring sufficient penetration of high-energy rays.

[0038] The upper cover plate 3 and the lower cover plate 4 of the present invention are both designed in a rectangular sheet shape, completely covering all the grid holes of the anti-scatter grid 1. This design can not only effectively prevent dust from entering the grid holes, but also further enhance the overall strength of the anti-scatter grid assembly. In practical applications, the upper cover plate 3 and the lower cover plate 4 can be made of lightweight and high-strength materials, such as carbon fiber composite materials, to reduce the absorption of X-rays.

[0039] In order to achieve the best scattered ray absorption effect, the present invention preferably uses high-density materials to make the anti-scatter grid 1. Commonly used high-density materials include tungsten, molybdenum, etc. These materials have excellent X-ray absorption capabilities and can effectively reduce the impact of scattered rays on imaging quality. At the same time, in addition, the structural design of the anti-scatter grid 1 also has an important impact on its strength and service life. For example, by increasing the thickness of the bottom of the grid, adopting a rib design, setting bosses at both ends, and bonding the upper and lower cover plates, the structural strength of the anti-scatter grid 1 can be effectively improved, thereby extending its service life.

[0040] Through the above design, the anti-scattering grid assembly of the present invention not only realizes efficient scattered ray absorption and high- and low-energy ray separation, but also has the advantages of stable structure, convenient installation, and simple maintenance. This comprehensive technical breakthrough makes the present invention have broad application prospects in the field of medical imaging equipment such as CT systems. Please refer to Fig.18 In a preferred embodiment of the present invention, the anti-scatter grid assembly further includes a detection plate 6, a substrate 20, a heat sink 21 and a bracket 22. These components work together with the aforementioned anti-scatter grid 1, filter 2, etc. to form a complete detector module, further improving the performance and reliability of the overall system.

[0041] The detection board 6 is a key component in the present invention that is responsible for receiving X-rays and converting them into electrical signals. Figure 7 As shown, the detection board 6 includes a scintillator 63 and a photodiode board 64 distributed in an array. The scintillator 63 is responsible for converting the incident X-rays into visible light, while the photodiode board 64 converts the visible light into electrical signals. Preferably, the scintillator 63 can be made of materials such as cesium iodide (CsI) or gadolinium oxysulfide (GOS), which have excellent X-ray conversion efficiency and spatial resolution. The photodiode board 64 is usually made of amorphous silicon (a-Si) or complementary metal oxide semiconductor (CMOS) technology to achieve efficient photoelectric conversion.

[0042] The substrate 20 plays a vital supporting and connecting role in the present invention. Fig.18 As shown, the substrate 20 is used to install and fix the anti-scatter grid assembly and the detection plate 6. In particular, the upper surface of the substrate 20 is provided with multiple bosses, which cleverly serve as the mounting surface of the anti-scatter grid assembly and the detection plate 6. This design not only improves the mounting accuracy, but also facilitates the alignment between the components. The lower surface of the substrate 20 is a plane and is provided with multiple connection holes. These connection holes facilitate the installation of the radiator 21 and the bracket 22, and also provide an interface for the connection of the entire module with other parts of the CT system.

[0043] In order to effectively solve the problem of heat generated during the operation of the detector, the present invention designs a radiator 21. The radiator 21 is installed at the bottom of the substrate 20. Preferably, the radiator 21 can be made of a high thermal conductivity material such as aluminum or copper, and is designed with a plurality of heat dissipation fins. This design greatly increases the heat dissipation area and effectively improves the heat dissipation efficiency. In some embodiments, the radiator 21 can also integrate a liquid cooling system to further enhance the heat dissipation capacity and ensure that the detector maintains stable performance during long-term operation.

[0044] The bracket 22 is another important structural component in the present invention. The bracket 22 is mounted on the bottom surface of the substrate 20, and has flaps on both sides. This design significantly enhances the structural strength of the entire module. In particular, a plurality of circular holes are provided on the longitudinal flanges. These circular holes not only reduce the weight of the bracket 22, but also provide gripping points for fingers or tools, greatly facilitating the installation and maintenance operations of the module. Preferably, the height of the bracket 22 is consistent with the height of the radiator 21, so that the entire module can remain stable when placed and is not easy to tip over.

[0045] In practical applications of the present invention, multiple groups of the above-mentioned detector modules can be installed on the detector bracket of the CT system. When the X-ray source emits a conical light beam, the rays first pass through the anti-scattering grid 1, at which time most of the scattered rays are absorbed. Subsequently, the rays pass through the filter 2, and the low-energy rays are filtered out. Finally, the remaining high-energy rays are received by the scintillator corresponding to the inverted U-shaped groove 13, generating high-energy data. The scintillator corresponding to the adjacent grid of the inverted U-shaped groove 13 receives the low-energy rays and generates low-energy data. This design cleverly realizes dual-energy CT imaging and significantly improves image quality and diagnostic accuracy.

[0046] Through the above design, the anti-scattering grid assembly of the present invention not only realizes efficient scattered ray absorption and high- and low-energy ray separation, but also solves practical application problems such as thermal management and installation convenience. This comprehensive technical breakthrough enables the present invention to have significant technical advantages and broad application prospects in the field of medical imaging equipment such as CT systems.

[0047] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An anti-scattering grid component capable of realizing dual-energy collection, characterized in that: include: An anti-scattering grid, the anti-scattering grid is an integrally formed mesh grid, comprising a cross-formed transverse grid sheet and a longitudinal grid sheet, the transverse grid sheet and the longitudinal grid sheet are both inclined in a focusing manner, and the bottom of the anti-scattering grid is provided with inverted U-shaped grooves spaced apart in the longitudinal direction; A filter, which is in the shape of a long strip and is embedded and fixed in the inverted U-shaped groove at the bottom of the anti-scattering grid; An upper cover plate, the upper cover plate covers and is fixed on the top of the anti-scatter grid; A lower cover plate, the lower cover plate covers and is fixed to the bottom of the anti-scatter grid; Wherein, the bottom grid of the anti-scattering grid corresponds one to one with the scintillator on the detection plate, and the inverted U-shaped grooves cover part of the scintillator at intervals in the longitudinal direction; The cross section of the transverse grid sheet includes: A top portion 1, wherein the top portion 1 is thinner and longer; a middle portion, wherein the thickness of the middle portion is greater than that of the top portion 1 and the length of the middle portion is less than that of the top portion 1; The root portion 1 has a side surface that is concave inwardly formed into an inverted L-shaped structure, and the inverted L-shaped structures of two adjacent transverse grid pieces are opposite to each other to form the inverted U-shaped groove.

2. The anti-scatter grid assembly according to claim 1, characterized in that: The cross section of the longitudinal grid sheet comprises: A second top portion, wherein the second top portion is thinner and longer; A second root portion, wherein the second root portion has a thickness greater than that of the second top portion and a length less than that of the second top portion; Among them, the root two sizes of any cross section of a single longitudinal grid piece are different, the root two of the cross section located at the inverted U-shaped groove is shorter, and the root two located at the non-inverted U-shaped groove is longer.

3. The anti-scatter grid assembly according to claim 1, characterized in that: The plane projection shape of the longitudinal grid sheet is a rectangular sheet, and the inverted U-shaped grooves are distributed at intervals at the bottom.

4. The anti-scatter grid assembly according to claim 1, characterized in that: Two bosses extend from the bottom of the outermost longitudinal grid piece of the anti-scatter grid, each of which is provided with two parallel ribs, the ribs connecting the boss and the grid outer wall, and the bosses on both sides are provided with positioning holes and connecting holes.

5. The anti-scatter grid assembly according to claim 1, characterized in that: The inverted U-shaped groove also includes: A small inverted U-shaped groove is located at the top corner of the groove and cut upward along the side wall of the groove. The height of the small inverted U-shaped groove is 0.2-0.4mm and the width is 0.4-0.6mm.

6. The anti-scatter grid assembly according to claim 1, characterized in that: The length, width and height of the filter are consistent with the size of the bottom groove of the anti-scattering grid, and the filter is glued and fixed to the top surface and side wall of the inverted U-shaped groove.

7. The anti-scatter grid assembly according to claim 1, characterized in that: The upper cover plate and the lower cover plate are both in the shape of rectangular sheets, covering all grid holes of the anti-scattering grid.

8. The anti-scatter grid assembly according to claim 1, characterized in that: The anti-scattering grid is made of high-density material. The scintillator on the detection plate covered by the inverted U-shaped groove is a high-energy scintillator, and the scintillator not covered by the inverted U-shaped groove is a low-energy scintillator.

9. The anti-scatter grid assembly according to any one of claims 1 to 8, characterized in that: Also includes: A detection board, the detection board comprising a scintillator and a photodiode board distributed in an array; A substrate, the substrate is used to install and fix the anti-scatter grid assembly and the detection plate, the upper surface of the substrate is provided with a plurality of bosses as the installation surface of the anti-scatter grid assembly and the detection plate, and the lower surface is a plane and is provided with a plurality of connection holes; A heat sink, the heat sink is mounted on the bottom of the substrate; The bracket is installed on the bottom surface of the base plate, with flanges on both sides and a plurality of circular holes opened on the flanges along the longitudinal direction.

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