Comb-shaped collimator and ray detection device adopting comb-shaped collimator

Abstract

The invention discloses a comb-shaped collimator which comprises a collimator main body which comprises an inner edge and an outer edge, multiple layers of collimation slits are arranged on the collimator main body in the height direction, every two adjacent layers of collimation slits are separated, each layer of collimation slit comprises multiple sub-collimation slits arranged in the transverse direction, and each sub-collimation slit extends from the inner edge to the outer edge; wherein the slit width of the sub collimation slit of each layer of collimation slit of the plurality of layers of collimation slits is different from the slit widths of the sub collimation slits of other layers of collimation slits. The invention further provides a ray detection device comprising the comb-shaped collimator, through the design of the comb-shaped collimator with multi-stage slit widths, the switching of collimation slits with different slit widths can be realized, so that the equivalent width of a detection channel of the ray detection device is adjusted, the adjustment of the spatial resolution of a scanned image of an industrial CT system is further realized, and the detection accuracy of the ray detection device is improved. And the application range of the industrial CT system is expanded.

Description

Technical Field

[0001] This invention relates to industrial CT technology systems, and particularly to a comb collimator and a radiation detection device using the comb collimator. Background Technology

[0002] Industrial CT systems can be configured with arc-shaped linear array detectors, linear detectors, and area array detectors. The arc-shaped linear array detector has a slice collimator and a comb collimator mounted at the front. The slit width of the comb collimator is the equivalent width of the detector element and is a crucial parameter determining the spatial resolution of the industrial CT system. A smaller slit width results in higher spatial resolution.

[0003] The comb-shaped collimator consists of multiple tungsten blocks arranged in an arc, with all collimation slits aligned with the focal point of the X-ray source. The tungsten blocks are made of tungsten alloy, which has high density, hardness, and melting point, making it challenging to precisely machine a series of tiny gaps on them. Previously, wire cutting was used to process the tungsten blocks, but the smallest slit width that could be produced was 0.2 mm. If even smaller slits were required, the difficulty and cost of wire cutting would increase significantly. Furthermore, wire cutting can only process single-layer open slits; multi-layer slits cannot be processed using traditional wire cutting methods. Summary of the Invention

[0004] In view of this, in order to solve at least one of the above-mentioned or other technical problems in the prior art, the present invention proposes a comb collimator and a ray detection device using the comb collimator, so as to achieve higher spatial resolution and a wider detection range.

[0005] According to one aspect of the present invention, a comb-shaped collimator is provided, characterized in that it comprises:

[0006] The collimator body includes an inner edge and an outer edge. The collimator body has at least a first-level collimation slit, a second-level collimation slit, and a third-level collimation slit arranged sequentially in the height direction. The first-level collimation slit, the second-level collimation slit, and the third-level collimation slit are all made using additive manufacturing technology, and adjacent collimation slits are spaced apart.

[0007] The collimator body is mounted on the mounting base, which is provided with positioning holes. The primary collimation seam, the secondary collimation seam, and the tertiary collimation seam are all arranged in layers along the height direction perpendicular to the plane of the mounting base 2.

[0008] Each layer of the alignment seam includes multiple sub-alignment seams arranged in the transverse direction, each sub-alignment seam extending from the inner edge to the outer edge, the number of sub-alignment seams in each layer of the alignment seam being the same, and the sub-alignment seams being perpendicular to the base surface of the mounting base;

[0009] Wherein, the seam width d3 of the sub-aligning seam of the third-level alignment seam is greater than the seam width d2 of the sub-aligning seam of the second-level alignment seam, and the seam width d2 of the sub-aligning seam of the second-level alignment seam is greater than the seam width d1 of the sub-aligning seam of the first-level alignment seam.

[0010] Preferably, the seam width d1 of the sub-alignment seam of the primary alignment seam is 0.05-0.1mm.

[0011] Preferably, the seam width d2 of the sub-alignment seam of the secondary alignment seam is 0.1-0.2 mm.

[0012] Preferably, the seam width d3 of the sub-alignment seam of the three-level alignment seam is 0.15-0.3mm.

[0013] Preferably, the center dividing planes of the sub-collimating seams of the multi-layer collimating seams located in the same column in the height direction coincide, and the sub-collimating seams are arranged at equal angles in the radial direction.

[0014] Preferably, the outer edge and the inner edge of the collimator body are concentric circular arcs, with the inner edge located on a circle with a radius R1 of approximately 1975 mm and the outer edge located on a circle with a radius R2 of approximately 2000 mm.

[0015] Preferably, the height h1 of the sub-alignment seam of each alignment seam layer is approximately 5 mm.

[0016] Preferably, the distance h2 between each collimation seam is approximately 3 mm.

[0017] Preferably, the arrangement period L of each collimating seam at the outer edge of the multi-layer collimating seam is approximately 1.3 mm.

[0018] According to another aspect of the present invention, a radiation detection device is provided, characterized in that it comprises:

[0019] Base;

[0020] The detector unit is mounted on the base;

[0021] According to any one of claims 1-9, the plurality of comb collimators are arranged sequentially in the transverse direction; and

[0022] The first lifting device is suitable for lifting multiple comb-shaped collimators so that the detected rays pass through sub-collimation slits located at different heights to reach the detector unit;

[0023] A layer-cutting collimator is disposed upstream of the plurality of comb-shaped collimators in the radiation direction of the ray, the layer-cutting collimator comprising:

[0024] The fixing part is fixedly mounted on the base; and

[0025] A movable part is installed above the fixed part, and the space between the fixed part and the movable part forms a slit;

[0026] The first lifting device lifts and lowers multiple comb-shaped collimators, so that the sub-collimation slits located on the same layer among the multiple comb-shaped collimators are aligned with the cut layer;

[0027] A second lifting device is used to lift the movable part to adjust the thickness of the slice. The second lifting device includes:

[0028] Two upright frames are installed on both sides of the slice collimator;

[0029] A crossbeam is installed between the upper ends of two upright frames;

[0030] A support assembly is mounted on the upper side of the movable part; and

[0031] A drive mechanism is mounted on the crossbeam and connected to the support assembly to drive the support assembly to rise and fall.

[0032] The present invention achieves the following beneficial technical effects compared to the prior art:

[0033] According to the comb collimator provided by the present invention, by designing a comb collimator with multiple slit widths, it is possible to switch between collimation slits of different slit widths, thereby realizing the adjustment of the spatial resolution of the scanned images of the industrial CT system and expanding the applicability of the industrial CT system. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a three-dimensional schematic diagram of a comb-shaped collimator according to an embodiment of the present invention;

[0036] Figure 2 This is a front view of a comb collimator according to an embodiment of the present invention;

[0037] Figure 3 A schematic diagram of the sub-collimation slit of the comb-shaped collimator according to an embodiment of the present invention;

[0038] Figure 4 This is a left view of a comb collimator according to an embodiment of the present invention;

[0039] Figure 5 This is a top view of a comb-shaped collimator according to an embodiment of the present invention;

[0040] Figure 6 A perspective view of a radiation detection device according to an embodiment of the present invention;

[0041] Figure 7 This is a front view of a radiation detection device according to an embodiment of the present invention;

[0042] Figure 8 This is a top view of a radiation detection device according to an embodiment of the present invention.

[0043] Explanation of reference numerals in the attached figures

[0044] 1-Collider body;

[0045] 11-Inner edge;

[0046] 12-Outer edge;

[0047] 2-Mounting base;

[0048] 21-Positioning hole;

[0049] 3-Base;

[0050] 4-Detector unit;

[0051] 5-First lifting device;

[0052] 6-Cut collimator;

[0053] 61-Fixing part;

[0054] 62-Modible part;

[0055] 63-Cut layer;

[0056] 7-Second lifting device;

[0057] 71-Upright frame;

[0058] 72-Crossbeam;

[0059] 73 - Support components;

[0060] 74-Drive mechanism;

[0061] 75 - Sliding guide rail assembly;

[0062] 8-Mounting plate;

[0063] d1 - The seam width of the sub-aligned seam of the primary alignment seam;

[0064] d2 - The width of the sub-collimation seam of the secondary collimation seam;

[0065] d3 - The seam width of the sub-aligned seam of the third-level alignment seam;

[0066] h1 - Height of the sub-alignment seam;

[0067] h2 - The distance between each collimation seam;

[0068] h3 - Height of the mounting base;

[0069] H - Height of the comb collimator;

[0070] L - The periodicity of the alignment seams at the outer edge of each layer;

[0071] R1 - Radius of the inner edge of the collimator body;

[0072] R2 - The radius of the outer edge of the collimator body. Detailed Implementation

[0073] The serial numbers assigned to components in this document, such as "first," "second," etc., are merely used to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages). In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 limitations on the invention.

[0074] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0075] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0076] The purpose of this invention is to provide a comb collimator and a radiation detection device using the comb collimator, so as to solve the problems existing in the prior art.

[0077] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0078] Example 1:

[0079] Additive manufacturing, also known as 3D printing, is a newly emerging precision and rapid prototyping manufacturing method that can precisely print special and complex mechanical structures that are difficult to process using other methods. This invention employs additive manufacturing to process tungsten blocks in order to obtain a comb-shaped collimator with a narrower slit width and achieve higher spatial resolution.

[0080] Current industrial CT systems all use comb collimators with a single slit width, and the equivalent width of the detector unit is fixed, so the maximum spatial resolution that the system can achieve is a fixed value. Although the spatial resolution can be adjusted by adjusting the relative positions of the X-ray source, detector unit, and turntable, this is often limited by factors such as workpiece size, and the adjustment range is very limited.

[0081] In view of this, this embodiment provides a comb collimator with multiple slit widths, which can meet different detection requirements such as space, density and detection efficiency by switching the slit width of the comb collimator on the same system.

[0082] Figure 1 This is a three-dimensional schematic diagram of a comb-shaped collimator according to an embodiment of the present invention; Figure 2 This is a front view of a comb collimator according to an embodiment of the present invention; Figure 3 A schematic diagram of the sub-collimation slit of the comb-shaped collimator according to an embodiment of the present invention; Figure 4 This is a left view of a comb collimator according to an embodiment of the present invention; Figure 5 This is a top view of a comb collimator according to an embodiment of the present invention.

[0083] This embodiment provides a comb-shaped collimator, reference... Figure 1-5 As shown, it includes: a collimator body 1, including an inner edge 11 and an outer edge 12. The collimator body 1 has multiple collimation slits arranged in the height direction, with adjacent collimation slits spaced apart. Each collimation slit includes multiple sub-collimation slits arranged in the transverse direction, with each sub-collimation slit extending from the inner edge 11 to the outer edge 12. The width of the sub-collimation slits in each of the multiple collimation slits is different from the width of the sub-collimation slits in other collimation slits.

[0084] According to an embodiment of the present invention, the comb-shaped collimator further includes a mounting base 2, on which the collimator body 1 is mounted. The mounting base 2 is also provided with positioning holes 21. The sub-collimating seams of the multi-layer collimating seams are perpendicular to the base surface of the mounting base 2, and the multi-layer collimating seams are arranged in layers along the height direction perpendicular to the plane of the mounting base 2.

[0085] According to an embodiment of the present invention, the number of layers of the multi-layer collimation suture is not specifically limited and can be set according to the actual detection requirements of the industrial CT system. For example, it can be set to 3 layers, or 2, 4, 5 layers, etc.

[0086] According to an embodiment of the present invention, reference Figure 2-3 As shown, the multi-layered straight seam includes a primary straight seam, a secondary straight seam, and a tertiary straight seam. The seam width d3 of the sub-straight seam of the tertiary straight seam is greater than the seam width d2 of the sub-straight seam of the secondary straight seam, and the seam width d2 of the sub-straight seam of the secondary straight seam is greater than the seam width d1 of the sub-straight seam of the primary straight seam.

[0087] According to an embodiment of the present invention, the primary collimation seam, the secondary collimation seam, and the tertiary collimation seam are arranged sequentially in the height direction.

[0088] According to an embodiment of the present invention, the seam width d1 of the sub-aligned seam of the primary alignment seam can be approximately 0.1 mm; the seam width d2 of the sub-aligned seam of the secondary alignment seam can be approximately 0.2 mm; and the seam width d3 of the sub-aligned seam of the tertiary alignment seam can be approximately 0.3 mm.

[0089] According to an embodiment of the present invention, the seam width d1 of the sub-aligned seam of the primary alignment seam can be approximately 0.05 mm; the seam width d2 of the sub-aligned seam of the secondary alignment seam can be approximately 0.1 mm; and the seam width d3 of the sub-aligned seam of the tertiary alignment seam can be approximately 0.15 mm.

[0090] It should be noted that the slit width of the collimation slit affects the spatial resolution of the scanned images from X-ray detection devices or industrial CT systems. The smaller the slit width, the higher the spatial resolution of the scanned images from the industrial CT system. In actual detection, the slit width of multiple collimation slits can be designed according to the spatial resolution requirements of the scanned images.

[0091] According to an embodiment of the present invention, the multi-layer collimation slit is made using additive manufacturing (or 3D printing) technology. The tungsten block with a collimation slit width of less than 0.2 mm is made using additive manufacturing technology, which enables X-ray detection devices or industrial CT systems including such comb collimators to achieve higher spatial resolution.

[0092] According to an embodiment of the present invention, by designing a comb-shaped collimator with multiple slit widths, the switching of collimation slits with different slit widths can be realized in actual detection.

[0093] According to an embodiment of the present invention, the number of sub-aligning seams in each layer of the multi-layer alignment seam is the same; the center dividing planes of the sub-aligning seams of the multi-layer alignment seam located in the same column in the height direction coincide.

[0094] According to an embodiment of the present invention, the number of sub-collimating seams in each layer of the multi-layer collimating seam is not specifically limited and can be configured according to actual needs. For example, each layer of the collimating seam of each comb collimator can form 75 sub-collimating seams, and the sub-collimating seams are arranged at equal angles along the radial direction.

[0095] According to an embodiment of the present invention, the height h1 of the sub-aligning seam in each layer of the multi-layer alignment seam is approximately 5 mm, the distance h2 between each layer of alignment seam is approximately 3 mm, and the arrangement period L of each layer of alignment seam at the outer edge 12 is approximately 1.3 mm. (Reference) Figure 4 As shown, the height h3 of the mounting base 2 is 8mm, and the height H of the comb-shaped collimator with 3 collimation slits is 29mm.

[0096] According to an embodiment of the present invention, reference Figure 5 As shown, the inner edge 11 and outer edge 12 of the collimator body 1 are concentric circular arcs. That is, the inner edge 11 and outer edge 12 lie on two concentric circles. The inner edge 11 of the collimator body 1 lies on a circle with a radius R1 of approximately 1975 mm, and the outer edge 12 of the collimator body 1 lies on a circle with a radius R2 of approximately 2 meters. It should be noted that the radius of the arc of the outer edge 12 of the collimator body 1 can be designed and manufactured according to actual needs.

[0097] Example 2:

[0098] Figure 6 This is a perspective view of a radiation detection device according to an embodiment of the present invention. Figure 7 This is a front view of a radiation detection device according to an embodiment of the present invention. Figure 8 This is a top view of a radiation detection device according to an embodiment of the present invention.

[0099] This embodiment provides a radiation detection device, referenced... Figure 6-8 As shown, it includes: a base 3; a detector unit 4 mounted on the base 3; a plurality of comb collimators according to any of the above embodiments, the plurality of comb collimators being arranged sequentially in the transverse direction; and a first lifting device 5, adapted to lift the plurality of comb collimators so that the detected rays pass through sub-collimation slits located at different heights to reach the detector unit 4.

[0100] According to an embodiment of the present invention, the X-ray detection device further includes a mounting plate 8, and a plurality of comb-shaped collimators are fixed to the mounting plate 8 through positioning holes 21.

[0101] According to an embodiment of the present invention, the detector unit 4 has multiple detector arrays facing the X-ray source side.

[0102] According to an embodiment of the present invention, a plurality of comb-shaped collimators are arranged in an arc shape in the transverse direction. A first lifting device 5 is disposed at both ends of the plurality of comb-shaped collimators. The first lifting device 5 can be a precision electric lift, so as to raise or lower the comb-shaped collimators as needed, so that one layer of the collimation slits in the multi-layer collimation slits of the plurality of comb-shaped collimators is aligned with the detector array on the detector unit.

[0103] According to embodiments of the present invention, the number of comb collimators included in the X-ray detection device is not specifically limited and can be configured according to actual needs; for example, the X-ray detection device may include nine identical comb collimators arranged in an arc in the transverse direction.

[0104] According to an embodiment of the present invention, the X-ray detection device further includes a layer collimator 6, which is disposed upstream of a plurality of comb collimators in the radiation direction of the X-ray.

[0105] According to an embodiment of the present invention, the slice collimator 6 includes: a fixed part 61, fixedly mounted on a base 3; and a movable part 62, mounted above the fixed part 61, the space (or gap) between the fixed part 61 and the movable part 62 forming a slice 63; wherein, a first lifting device 5 lifts and lowers a plurality of comb collimators, such that one collimation slit of the multi-layer collimation slits of the plurality of comb collimators is aligned with the slice 63. In this way, the X-rays to be detected first pass through the space between the fixed part 61 and the movable part 62 of the slice collimator 6, and then reach the detector array of the detector unit 4 through one collimation slit of the comb collimator, thereby realizing the detection of the X-ray dose.

[0106] According to an embodiment of the present invention, both the fixed part 61 and the movable part 62 are made of tungsten strips, and the X-ray detection device further includes a second lifting device 7, which is suitable for lifting the movable part 62 to adjust the thickness of the slice 63.

[0107] According to an embodiment of the present invention, the second lifting device 7 includes: two upright frames 71 installed on both sides of the layer-cutting collimator; a crossbeam 72 installed between the upper ends of the two upright frames 71; a support assembly 73 installed on the upper side of the movable part 62; and a drive mechanism 74 installed on the crossbeam 72 and connected to the support assembly 73 to drive the support assembly 73 to move up and down along the sliding guide rail assembly 75.

[0108] According to an exemplary embodiment of the present invention, the support assembly 73 includes a support plate mounted on the movable portion 62 and sliders mounted at both ends of the support plate. The sliding guide rail assembly 75 includes guide rails respectively mounted on two uprights 71, the guide rails being respectively engaged with the sliders, so that the movable portion 62 of the layer collimator 6 can move smoothly up and down along the uprights 71. The drive mechanism 74 includes a motor mounted on the crossbeam 72 and a transmission mechanism engaged with the output shaft of the motor, such that rotation of the output shaft of the motor drives the support plate to move up and down through the transmission mechanism.

[0109] According to an embodiment of the present invention, the second lifting device 7 can be a screw jack.

[0110] According to an embodiment of the present invention, by designing a comb-shaped collimator with multiple slit widths and a first lifting device for raising and lowering the comb-shaped collimator, the switching of collimation slits with different slit widths can be realized, so that one collimation slit of the multiple collimation slits in the multiple comb-shaped collimators is aligned with the detector array on the detector unit, and at the same time aligned with the cut layer of the cut layer collimator.

[0111] Example 3:

[0112] This embodiment provides an inspection system comprising: a radiation source adapted to emit radiation toward a target under test; and a radiation detection device according to any of the above embodiments, configured to detect the intensity of the radiation after it passes through the target under test.

[0113] According to the above embodiments of the present invention, the comb-shaped collimator is made of multiple collimation slits using additive manufacturing technology. The tungsten block with collimation slits less than 0.2 mm in width is made using additive manufacturing technology, which enables the industrial CT system to achieve higher spatial resolution in the scanned images and improves the detection capability of the industrial CT system.

[0114] According to the above-described embodiments of the present invention, the X-ray detection device, by designing a comb-shaped collimator with multiple slit widths and a first lifting device for raising and lowering the comb-shaped collimator, can realize the switching of collimation slits with different slit widths. It can align the collimation slits of different slit widths among multiple comb-shaped collimators with the slice collimator, realize the adjustment of the equivalent width of the detector unit, thereby realizing the adjustment of the spatial resolution of the scanned images of the industrial CT system and expanding the applicability of the industrial CT system.

[0115] Those skilled in the art will understand that the embodiments described above are exemplary and can be improved upon. The structures described in the various embodiments can be freely combined without causing any conflict in structure or principle.

[0116] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A comb-shaped collimator, characterized in that, include: The collimator body includes an inner edge and an outer edge. The collimator body has at least a first-level collimation slit, a second-level collimation slit, and a third-level collimation slit arranged sequentially in the height direction. The first-level collimation slit, the second-level collimation slit, and the third-level collimation slit are all made using additive manufacturing technology, and adjacent collimation slits are spaced apart. The collimator body is mounted on the mounting base, which is provided with positioning holes. The primary collimation seam, the secondary collimation seam, and the tertiary collimation seam are all arranged in layers along the height direction perpendicular to the plane of the mounting base 2. Each layer of the alignment seam includes multiple sub-alignment seams arranged in the transverse direction, each sub-alignment seam extending from the inner edge to the outer edge, the number of sub-alignment seams in each layer of the alignment seam being the same, and the sub-alignment seams being perpendicular to the base surface of the mounting base; Wherein, the seam width d3 of the sub-aligning seam of the third-level alignment seam is greater than the seam width d2 of the sub-aligning seam of the second-level alignment seam, and the seam width d2 of the sub-aligning seam of the second-level alignment seam is greater than the seam width d1 of the sub-aligning seam of the first-level alignment seam.

2. The comb-shaped collimator according to claim 1, characterized in that, The width d1 of the sub-aligning seam of the primary alignment seam is 0.05-0.1mm.

3. The comb-shaped collimator according to claim 1, characterized in that, The width d2 of the sub-alignment seam of the secondary alignment seam is 0.1-0.2 mm.

4. The comb-shaped collimator according to claim 1, characterized in that, The seam width d3 of the sub-alignment seam of the three-level alignment seam is 0.15-0.3mm.

5. The comb-shaped collimator according to claim 1, characterized in that, The center dividing planes of the sub-collimating seams of the multi-layer collimating seams located in the same column in the height direction coincide, and the sub-collimating seams are arranged at equal angles in the radial direction.

6. The comb-shaped collimator according to claim 1, characterized in that, The outer edge and the inner edge of the collimator body are concentric arcs. The inner edge is located on a circle with a radius R1 of approximately 1975 mm, and the outer edge is located on a circle with a radius R2 of approximately 2000 mm.

7. The comb-shaped collimator according to claim 1, characterized in that, The height h1 of the sub-alignment seam of each alignment seam is approximately 5mm.

8. The comb-shaped collimator according to claim 1, characterized in that, The distance h2 between each collimation seam is approximately 3mm.

9. The comb-shaped collimator according to claim 1, characterized in that, The arrangement period L of each collimating seam at the outer edge of the multi-layer collimating seam is approximately 1.3 mm.

10. A radiation detection device, characterized in that, include: Base; The detector unit is mounted on the base; According to any one of claims 1-9, the plurality of comb collimators are arranged sequentially in the transverse direction; and The first lifting device is suitable for lifting multiple comb-shaped collimators so that the detected rays pass through sub-collimation slits located at different heights to reach the detector unit; A layer-cutting collimator is disposed upstream of the plurality of comb-shaped collimators in the radiation direction of the ray, the layer-cutting collimator comprising: The fixing part is fixedly mounted on the base; and A movable part is installed above the fixed part, and the space between the fixed part and the movable part forms a slit; The first lifting device lifts and lowers multiple comb-shaped collimators, so that the sub-collimation slits located on the same layer among the multiple comb-shaped collimators are aligned with the cut layer; A second lifting device is used to lift the movable part to adjust the thickness of the slice. The second lifting device includes: Two upright frames are installed on both sides of the slice collimator; A crossbeam is installed between the upper ends of two upright frames; A support assembly is mounted on the upper side of the movable part; and A drive mechanism is mounted on the crossbeam and connected to the support assembly to drive the support assembly to rise and fall.

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