Parallel hole collimator and scanning apparatus

Abstract

The application provides a parallel hole collimator and a scanning device, and relates to the technical field of medical appliances. The parallel hole collimator comprises a collimator body, a plurality of parallel holes arranged on the collimator body and extending along the height direction of the collimator body, a hole wall formed between two adjacent parallel holes, and the thickness of the hole wall is the same at different positions of the collimator body. The collimator body comprises two or more sub-bodies, and the collimator body is formed by splicing the sub-bodies, and at least part of the parallel holes is formed by splicing the sub-bodies. The parallel hole collimator provided by the application can improve the forming efficiency of the collimator body, ensure high precision and high image quality, meet the resolution and sensitivity requirements, reduce the cost, improve the efficiency, and can be widely applied to medical products.

Description

Technical Field

[0001] This application belongs to the field of medical device technology, and in particular relates to a parallel hole collimator and scanning device. Background Technology

[0002] In medical imaging technology, single-photon emission computed tomography (SPECT) is an important diagnostic tool. It generates images of the body's internal structures by detecting and analyzing gamma rays emitted by radiopharmaceuticals within the body. In this process, the parallel-aperture collimator plays a crucial role; it absorbs ineffective gamma rays and limits the incident angle and direction of effective gamma rays, ensuring high-quality SPECT images with clear imaging and minimal artifacts. Summary of the Invention

[0003] The purpose of this application is to provide a parallel hole collimator and scanning device, which improves the sensitivity of the scanning device by setting the thickness of the hole walls at all locations on the collimator body to be the same.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0005] This application provides a parallel hole collimator, including a collimator body, on which a plurality of parallel holes are provided that are parallel to each other and extend along the height direction of the collimator body, and a hole wall is formed between two adjacent parallel holes, and the thickness of the hole wall is the same at all locations on the collimator body.

[0006] The uniformity of the hole wall thickness also affects the sensitivity of the scanning device. Therefore, in the parallel hole collimator provided in this application, the hole wall thickness is the same at all points on the collimator body.

[0007] In some implementations, the collimator body comprises two or more parts, which are assembled from the parts, and at least some of the parallel holes are formed by assembling the parts.

[0008] By using a collimator body formed by splicing individual components, the efficiency of parallel hole collimator forming can be improved, ensuring high precision and high image quality. While meeting resolution and sensitivity requirements, costs are reduced and efficiency is increased, making it widely applicable in medical products.

[0009] In some implementations, two adjacent parts are glued together.

[0010] By using adhesive bonding, not only can two adjacent parts be connected, but the gap between the two adjacent parts can also be minimized.

[0011] In some implementations, the components are thin plates, and each component is arranged sequentially along a first direction, which is the length or width direction of the collimator body. Each parallel hole is formed by splicing two adjacent thin plates.

[0012] In this implementation, the collimator body has a lower manufacturing cost and higher wall thickness uniformity. This forming process is generally used in collimators with small wall thickness and small aperture, such as low-energy collimators.

[0013] In some implementations, the split body includes a docking area, two adjacent split bodies are arranged in a centrally symmetrical manner and the docking areas of the two adjacent split bodies are connected, and the thickness of the two connected docking areas is equal to the thickness of the hole wall.

[0014] In this implementation, the thickness of the two connected mating areas is equal to the thickness of the hole wall, so as to ensure that the thickness of the hole wall is the same at all points on the collimator body.

[0015] In some implementations, the split body also includes a connecting area. The length direction of the docking area and the connecting area is along the height direction of the collimator body. Two rows of docking areas are arranged along the first direction. Each row of docking areas is spaced apart along the second direction. The two rows of docking areas are staggered. Two adjacent docking areas in the two rows of docking areas are connected by the connecting area. The second direction is perpendicular to the first direction. The thickness of the two connected docking areas is equal to the thickness of the connecting area.

[0016] The shape of the parallel holes is generally square or regular hexagonal so that the thickness of the hole walls is the same at all parts of the collimator body. In this implementation, the split shape and the use of two adjacent splits in a centrally symmetrical arrangement are used to make the shape of the parallel holes square or regular hexagonal.

[0017] In some implementations, the thickness of the mating area is half the thickness of the connection area.

[0018] In this implementation, the thickness of the docking area is half the thickness of the connection area, making the structure of each component identical and facilitating the splicing of the collimator body.

[0019] In some implementations, the individual components are 3D printed.

[0020] This method uses 3D printing technology to print the separate parts, and then splices the parts together to form the collimator body, thus improving the production efficiency.

[0021] In some implementations, the surface where one part fits into another in two adjacent parts is called the splicing surface. The splicing surface includes a first region surface and a second region surface. The first region surface is positioned above the second region surface along the height direction of the collimator body, and the first region surface and the second region surface are on different planes.

[0022] Due to errors in 3D printing technology and the splicing and fixing methods, gaps may exist between the two parts, posing a risk of radiation leakage during imaging and affecting sensitivity. Therefore, in this implementation, the first and second regional surfaces are on different planes, and there is a staggered layer in the height direction during splicing. In this way, when radiation enters through the gap between the first regional surfaces of the two parts, the invalid radiation entering through the gap is absorbed, thereby avoiding the risk of radiation leakage during imaging.

[0023] In some implementations, the collimator body includes a central body and a protruding connecting part. The central body has parallel holes, and the protruding connecting parts are provided on two opposite sides of the central body. At least part or all of the split parts include a split body for splicing the central body and a split protruding part for splicing the protruding connecting parts.

[0024] In this implementation, by providing a protruding connecting part, it can be connected to the frame of the SPECT equipment, thereby fixing the parallel hole collimator to the frame. Additionally, in some scenarios, the separate protruding parts can be connected to form the main body of the collimator, eliminating the need for adhesive bonding between the individual parts.

[0025] In some implementations, the parallel hole collimator also includes a sleeve assembly, which is used to sleeve the collimator body to fix the individual components.

[0026] In this implementation, the circumferential side of the sleeved component is pressed against each of the individual parts to achieve the splicing of the individual parts into the collimator body. At this time, there is no need to bond the individual parts together, making it convenient to connect and splice the individual parts into the collimator body.

[0027] In some implementations, the individual components are cast.

[0028] In this implementation, the manufacturing cost of the collimator body is relatively low. However, because the diameter d and wall thickness h of the parallel hole are too small, they are prone to failure, resulting in a low yield. Therefore, this method is generally used for collimators with larger diameter d and wall thickness h, such as medium and high energy collimators.

[0029] In some implementations, the parallel hole collimator also includes a base plate, the collimator body is supported on the base plate, the base plate is provided with connecting holes, the shape of the connecting holes is the same as the shape of the parallel holes, the distribution of the connecting holes on the base plate is the same as the distribution of the parallel holes on the collimator body, and the connecting holes and parallel holes correspond one-to-one; the base plate protrudes from the collimator body on opposite sides along the length or width direction in the horizontal direction.

[0030] In this implementation, the collimator body can be connected to the frame of the SPECT equipment via a base plate.

[0031] In some implementations, the parallel hole collimator also includes a protective cover. The bottom of the protective cover has an opening for inserting the collimator body. The collimator body is covered by the protective cover, and the bottom of the protective cover is connected to the base plate. A cover through hole is provided on the top plate of the protective cover above the collimator body. The cover through hole has the same shape as the parallel hole, and the distribution of the cover through hole on the protective cover is the same as the distribution of the parallel hole on the collimator body. The cover through hole and the parallel hole correspond one-to-one. Alternatively, the top plate of the protective cover above the collimator body covers the opening on the collimator body.

[0032] In this implementation, a protective cover is set up to protect the main body of the straightener.

[0033] In some implementations, the components are formed by casting molten lead alloy; the hardness of the protective cover and the base plate is greater than that of the components.

[0034] Lead is a toxic heavy metal; prolonged exposure to lead alloys without adequate protective measures can lead to poisoning. Therefore, a protective cover and base plate are added to confine the lead alloy collimator body within these components, preventing direct contact with the collimator body during installation and thus improving safety. Furthermore, the increased hardness of the protective cover and base plate compared to the separate components enhances the strength of the parallel hole collimator.

[0035] In some implementations, the molding processes of each component in the same collimator body are the same; or, in the same collimator body, the molding processes of some components are different from those of other components.

[0036] Based on actual conditions, select the molding process for each component in the same collimator body to improve the molding efficiency of the parallel hole collimator.

[0037] In some implementations, the parts are formed by casting; or by 3D printing; or by splicing thin plates together.

[0038] A second aspect of this application provides a scanning device, including the parallel hole collimator provided by any of the above-described technical solutions.

[0039] The scanning device provided in this application includes the above-mentioned parallel aperture collimator, and therefore includes at least all the beneficial effects of the above-mentioned parallel aperture collimator, which will not be repeated here. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the structure of the collimator body provided in an embodiment of this application;

[0042] Figure 2 Another structural schematic diagram of the collimator body provided in the embodiments of this application;

[0043] Figure 3 A top view of a portion of the collimator body provided in an embodiment of this application;

[0044] Figure 4 A cross-sectional schematic diagram of a portion of the collimator body provided in an embodiment of this application;

[0045] Figure 5 This is a schematic diagram of a structure consisting of thin plates, provided in an embodiment of this application.

[0046] Figure 6 This is a schematic diagram illustrating the process of splitting the collimator body into thin plates according to an embodiment of the present application.

[0047] Figure 7 A top view schematic diagram illustrating the process of assembling a collimator body from 3D printed parts, as provided in an embodiment of this application.

[0048] Figure 8 A front view schematic diagram illustrating the process of assembling a collimator body from 3D printed parts, as provided in an embodiment of this application.

[0049] Figure 9 A top view of the process of assembling another 3D printed part into the collimator body, as provided in this embodiment of the application;

[0050] Figure 10 This is a schematic diagram of the collimator body when it is a 3D printed part, as provided in the embodiments of this application;

[0051] Figure 11 This is a schematic diagram of the parallel hole collimator when the parts are 3D printed, as provided in the embodiments of this application;

[0052] Figure 12 A schematic diagram illustrating the process of assembling the collimator body when the parts are 3D castings, as provided in the embodiments of this application;

[0053] Figure 13This is a schematic diagram of the structure of the base plate provided in the embodiments of this application;

[0054] Figure 14 This is a schematic diagram of the structure of the protective cover provided in the embodiments of this application;

[0055] Figure 15 This is a schematic diagram of the parallel hole collimator provided in the embodiments of this application when the split part is a casting.

[0056] The following are the labeling elements in the figure:

[0057] 100-parallel hole collimator;

[0058] 1-Collider body; 2-Base plate; 3-Protective cover; 4-Connecting plate;

[0059] 11-Parallel hole; 12-Hole wall; 13-Separated body; 14-Middle main body; 15-Protruding connecting part;

[0060] 131-Dating area; 132-Connecting area; 133-Matching surface; 134-Separated main body; 135-Separated protruding part; 136-Opening;

[0061] 1331 - First region surface; 1332 - Second region surface; 1333 - Third region surface;

[0062] 21 - Connecting hole;

[0063] 31-Opening; 32-Top plate; 33-Through hole in the cover. Detailed Implementation

[0064] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be further described in detail below with reference to the accompanying drawings. The embodiments described with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0065] In the description of this application, it should be understood that the terms "length", "width", "thickness", "top", "bottom", "inner", "outer", "upper", "lower", "left", "right", 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 application 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 limitations on this application.

[0066] To facilitate a clear description of the technical solutions of this application, the terms "first" and "second" are used to distinguish identical or similar items with essentially the same function and effect. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and that the terms "first" and "second" do not necessarily imply that they are different.

[0067] In this application, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0068] In this application, "and / or" is merely a way of describing the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0069] It should be noted that, in this application, the words "in one embodiment," "exemplarily," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in one embodiment," "exemplarily," or "for example" should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of words such as "in one embodiment," "exemplarily," and "for example" is intended to present the relevant concepts in a specific manner.

[0070] Please refer to the following: Figures 1-15 The parallel hole collimator 100 provided in the embodiments of this application will now be described.

[0071] The parallel hole collimator 100 provided in this embodiment includes a collimator body 1. Please refer to [link / reference]. Figures 1-2 The diagram illustrates the appearance of a collimator body 1. The collimator body 1 has several parallel holes 11 that are parallel to each other and extend along the height direction of the collimator body 1. (See attached image.) Figure 3 A hole wall 12 is formed between two adjacent parallel holes 11, and the thickness h of the hole wall 12 is the same at all points on the collimator body 1.

[0072] When the parallel-aperture collimator 100 provided in this embodiment is applied to a single-photon emission computed tomography (SPECT) device, the parallel-aperture collimator 100 is positioned above the detector. Imaging gamma rays are projected onto the detector crystal through the parallel aperture 11 of the collimator body 1. The parallel aperture 11 of the collimator body 1 restricts the angle and size of the rays, and the aperture wall 12 of the collimator body 1 can absorb invalid rays from other directions, reducing interference from invalid rays, reducing image artifacts, and ensuring the accuracy and quality of SPECT imaging.

[0073] The parallel hole 11 penetrates the upper and lower end faces of the collimator body 1 along the height direction. The shape of the parallel hole 11 is generally square or regular hexagonal. See [reference needed]. Figure 1 The diagram illustrates the collimator body 1, where the parallel hole 11 is square. (See attached image) Figure 2 This illustrates the collimator body 1, where the parallel hole 11 is a regular hexagon. Please refer to... Figure 3 The diagram illustrates the parallel hole 11 in the shape of a regular hexagon and the hole wall 12.

[0074] In this embodiment, the thickness of the hole wall 12 at all locations on the collimator body 1 is the same, which means that in principle the thickness of the hole wall 12 at all locations on the collimator body 1 is the same, while also including the case where the thickness of the hole wall 12 at all locations on the collimator body 1 is not exactly the same due to the processing error range.

[0075] Regarding the parallel holes 11 on the collimator body 1, the shape of the parallel holes 11 should not be circular. This is to ensure that the wall thickness h of the hole walls 12 between the parallel holes 11 is the same; otherwise, the sensitivity of the imaging system will be reduced or lost. See also... Figure 3 The diagram illustrates the diameter d of the parallel hole 11 and the wall thickness h of the hole wall 12. See [link / reference]. Figure 4The diagram illustrates the height H of the collimator body 1. The aperture d of the parallel aperture 11, the wall thickness h of the aperture wall 12, and the height H of the collimator body 1 determine the spatial resolution and system resolution of the imaging reconstruction. Simultaneously, the uniformity of the aperture d of the parallel aperture 11 and the wall thickness h of the aperture wall 12 also affects the system sensitivity. In principle, rounded corners between adjacent surfaces of the parallel aperture 11 are not permitted, as this would affect the imaging system sensitivity. Generally, due to manufacturing requirements, a certain angle of rounded corner exists between adjacent surfaces of the parallel aperture 11, provided it is within an acceptable range of system sensitivity loss. The smaller the aperture d of the parallel aperture 11, the larger the height H of the collimator body 1, resulting in higher reconstructed spatial resolution; a smaller wall thickness h of the collimator body 1 increases system sensitivity. Furthermore, based on the applicable gamma-ray energy range of the collimator, the parallel aperture collimator 100 can generally be divided into three types: low-energy (≤150keV), medium-energy (150~350keV), and high-energy (≥350keV), which can respectively meet the scanning imaging needs of different parts of the human body. The height H of the collimator body 1 varies for different energy ranges. The higher the energy, the greater the required shielding height, and the thickness of the collimator increases sequentially for low-energy, medium-energy, and high-energy collimators.

[0076] The collimator body 1 is typically made of materials with high shielding performance, such as lead, tungsten, bismuth, molybdenum, and their corresponding alloys. Because the collimator body 1 contains a large number of holes—thousands or even hundreds of thousands—traditional machining processes are inefficient and costly. In one embodiment, a splicing process is used, where the collimator body 1 comprises two or more parts 13, which are spliced ​​together, and at least some of the parallel holes 11 are formed by splicing the parts 13.

[0077] In this embodiment, at least some of the parallel holes 11 are formed by splicing the parts 13. That is, in one example, some of the parallel holes 11 of the collimator body 1 are formed by splicing the parts 13, or in another example, all the parallel holes 11 of the collimator body 1 are formed by splicing the parts 13.

[0078] By using a collimator body 1 formed by splicing together individual parts 13, the forming efficiency of the parallel hole collimator 100 can be improved, ensuring high precision and high image quality, meeting resolution and sensitivity requirements, while reducing costs and increasing efficiency. This method can be widely used in medical products.

[0079] In this embodiment, the collimator body 1 is formed by splicing together each component 13. In one example, the forming process of each component 13 is the same. For example, each component 13 is a thin plate, and the collimator body 1 is formed by splicing together the thin plates; or, each component 13 is formed by 3D printing or casting, and then the components 13 are spliced ​​together to form the collimator body 1. Different types of parallel hole collimators 100 can be formed using different molding processes for their separate parts 13. For example, low-energy, high-sensitivity parallel hole collimators 100 require a smaller aperture d for the parallel hole 11 and also have high requirements for the uniformity of the aperture d and the wall thickness h of the hole wall 12. In this case, the separate part 13 can be formed using 3D printing technology. Other low-energy parallel hole collimators 100 require a smaller aperture d for the parallel hole 11, but the uniformity of the aperture d and the wall thickness h of the hole wall 12 is not very high. In this case, they can be formed by splicing thin plates. For medium- and high-energy parallel hole collimators 100, since the aperture d of the parallel hole 11 and the wall thickness h of the hole wall 12 are larger, the separate part 13 can be formed using a casting process.

[0080] In this embodiment, the collimator body 1 is formed by assembling various parts 13. In one example, the molding process of some parts 13 is different from that of other parts 13. For example, some parts 13 are 3D printed, while other parts 13 are cast, and then the parts 13 are assembled into the collimator body 1.

[0081] Please see Figures 5-6 In one embodiment, each component 13 is a thin plate, the collimator body 1 is formed by splicing the components 13, and all parallel holes 11 are formed by splicing the components 13.

[0082] Please see Figure 5 The diagram illustrates a structural component 13. In this embodiment, the collimator body 1 is formed by assembling the components 13, and adjacent components 13 are bonded together. This bonding method not only connects adjacent components 13 but also minimizes the gap between them.

[0083] The adhesive that bonds the two parts 13 will neither absorb nor block gamma rays. However, by setting the thickness of the adhesive layer in the two adjacent parts 13, it is possible to achieve an acceptable loss of system sensitivity. For example, the thickness of the adhesive layer in the two adjacent parts 13 can be set to 0.01 mm to 0.02 mm.

[0084] In this embodiment, the collimator body 1 is formed by splicing together various components 13, which are arranged sequentially along a first direction, which is the length or width direction of the collimator body 1. Each parallel hole 11 is formed by splicing together two adjacent thin plates. In this embodiment, by splicing together various thin plates, the forming efficiency of the collimator body 1 can be improved.

[0085] Specifically, please see Figure 5 , Figure 5 This is a schematic diagram of the structure of the split body as a thin plate provided in the embodiment of this application. The split body 13 includes a docking area 131 and a connecting area 132. The length direction of the docking area 131 and the connecting area 132 is along the height direction of the collimator body 1. Two rows of docking areas 131 are arranged along the first direction. Each row of docking areas 132 is spaced apart along the second direction. The two rows of docking areas 132 are staggered. Two adjacent docking areas 132 in the two rows of docking areas 132 are connected by the connecting area 132. The second direction is perpendicular to the first direction.

[0086] Please see Figure 5 The height direction of the collimator body 1 is... Figure 5 In the direction of the Z-axis, the docking area 131 and the connecting area 132 extend along the Z-axis, which is the first direction. Figure 5 The direction of the X-axis, the second direction is Figure 5 In the direction of the Y-axis, two rows of docking areas 131 are set along the X-axis direction, from Figure 5 As can be seen, the two rows of docking areas 132 are staggered, and each row of docking areas 132 is spaced apart along the Y-axis.

[0087] See Figure 5 Two adjacent mating areas 132 in the two rows of mating areas 132 are connected by a connecting area 132. As mentioned above, the shape of the parallel hole 11 is generally square or regular hexagonal. Therefore, when the parallel hole 11 is regular hexagonal, see [reference needed]. Figure 5 The cross-sectional shape of a docking area 131 and two connecting areas 132 connected to the docking area 131 is an isosceles trapezoid; when the parallel hole 11 is square, the connecting area 132 is perpendicular to the docking area 131.

[0088] Please see Figure 6 This is a schematic diagram illustrating the process of the split 13 being a thin-plate collimator body 1 as provided in this embodiment of the application. Please refer to... Figure 6 (a) in the diagram illustrates two separate parts 13; please refer to [link / reference]. Figure 6 (b) illustrates two separate parts 13, which are centrally symmetrically arranged and whose docking areas 131 are connected. The two connected parts 13 are joined to form multiple parallel holes 11. Figure 6 Based on (b), along the first direction ( Figure 6 Multiple components 13 are arranged along the X-axis, and adjacent components 13 need to be centrally symmetrical and their docking areas 131 connected, so that they can be spliced ​​together to form a structure like... Figure 6 The collimator body 1 is shown in (c).

[0089] In this embodiment, it should be noted that the thickness of the two connected mating areas 131 is equal to the thickness of the connecting area 132. Please refer to [link / reference]. Figure 6 In (c), the connecting region 132 forms the hole wall 12, and the two connected mating regions 131 form the hole wall 12. Since the thickness of the hole wall 12 is the same at all locations on the collimator body 1, the thickness of the two connected mating regions 131 is equal to the thickness of the connecting region 132.

[0090] In a specific example, the thickness of the mating area 131 is half the thickness of the connecting area 132. In this example, the structures of each component 13 are identical. That is, the thickness of the connecting area 132 of each component 13 is the same, and the thickness of the mating area 131 of each component 13 is the same. The thickness of the mating area 131 is half the thickness of the connecting area 132, meaning the thickness formed by connecting two mating areas 131 is equal to the thickness of the mating area 131. Here, since the thickness of the adhesive layer between two mating areas 131 is very small compared to the thickness of the mating area 131, the thickness of the adhesive layer formed by connecting two mating areas 131 can be ignored. Since the thickness formed by connecting two mating areas 131 is equal to the thickness of the mating area 131, the thickness of the hole wall 12 at all locations on the collimator body 1 can be made the same.

[0091] In another specific example, the thickness of the mating area 131 is not half the thickness of the connecting area 132. For instance, the components 13 that make up the collimator body 1 are divided into a first component plate and a second component plate. The thickness of the mating area 131 on the first component plate is one-third the thickness of the connecting area 132, and the thickness of the mating area 131 on the second component plate is two-thirds the thickness of the connecting area 132. The thickness of the connecting area 132 is the same for all components 13. When assembling the collimator body 1, the first and second component plates can be alternately arranged. The thickness of the mating area 131 of the first component plate when it connects with the mating area 131 of the second component plate is equal to the thickness of the connecting area 132. In this specific example, the thickness of the mating area 131 on the first split plate is one-third of the thickness of the connecting area 132, and the thickness of the mating area 131 on the second split plate is two-thirds of the thickness of the connecting area 132. Of course, it is also possible to set the thickness of the mating area 131 on the first split plate to be one-quarter of the thickness of the connecting area 132, and the thickness of the mating area 131 on the second split plate to be three-quarters of the thickness of the connecting area 132, etc., as long as the thickness of the two mating areas 131 connected together is equal to the thickness of the mating area 131.

[0092] Regarding the dimensional relationship between the docking area 131 and the connecting area 132, it is preferable that the thickness of the docking area 131 is half the thickness of the connecting area 132, and that the structures of each component 13 are identical, which facilitates the splicing of the collimator body 1.

[0093] Regarding the material of the 13th component, it could be lead foil, tungsten sheet, or bismuth alloy sheet, etc.

[0094] In this embodiment, the collimator body 1 has a low manufacturing cost and high wall thickness uniformity. This molding process is generally used in collimators with small wall thickness and small aperture, such as low-energy collimators.

[0095] In this embodiment, when splicing the individual components 13, it is necessary to control and limit the dimensional tolerances of the components 13 so that the wall thickness h of the hole wall 12 has high uniformity and can obtain high system sensitivity. The overall splicing has high requirements for the process technology and requires high-precision splicing tooling and splicing process control.

[0096] Furthermore, when the parallel hole collimator 100 provided in this embodiment is applied to a SPECT device, in order to facilitate fixing the parallel hole collimator 100 to the frame of the SPECT device, a support plate can be connected to the collimator body 1 and fixed to the frame by the support plate, so as to facilitate fixing the collimator body 1 to the frame.

[0097] Please see Figures 7-11 In one embodiment, each component 13 is 3D printed, the collimator body 1 is formed by splicing the components 13, and some of the parallel holes 11 in the collimator body 1 are formed by splicing the components 13.

[0098] Please see Figure 7 and Figure 8 , Figure 7 A top view of the process of splicing the collimator body 1, which is a 3D printed part, as provided in the embodiment of this application; Figure 8 This is a front view schematic diagram illustrating the process of assembling the collimator body 1, which consists of 3D printed parts, according to an embodiment of this application. In this embodiment, the parts 13 are assembled horizontally. Please refer to... Figure 7 (a) and Figure 8 In (a) of the diagram, two unconnected parts 13 are shown. Please refer to [link / reference]. Figure 7 (b) and Figure 8 In (b), two 3D printed parts 13 are shown to be connected to form the collimator body 1.

[0099] Due to limitations in 3D printing technology, the larger the printed surface area, the lower the accuracy will be in areas further away from the laser center. In order to reduce costs, this embodiment will use 3D printing technology to print two or more separate parts 13, and then splice the separate parts 13 to form the collimator body 1, thereby improving the success rate of production.

[0100] Please see Figure 7 and Figure 8 This illustrates that the collimator body 1 comprises two parts 13. In this embodiment, the number of parts 13 is not limited to two; it can also be any number other than two. For example, see... Figure 9 , Figure 9 This is a top-view diagram illustrating the process of assembling the collimator body from separate 3D printed parts. Figure 9 The diagram illustrates that the collimator body 1 comprises four parts 13, which are connected to form the collimator body 1. Each part 13 has an array of parallel holes 11. When two parts 13 are connected, the joint of the two parts 13 will form a row of parallel holes 11. In this embodiment, some of the parallel holes 11 in the collimator body 1 are formed by splicing the parts 13.

[0101] For example, the material of component 13 is tungsten alloy or bismuth alloy, etc.

[0102] For example, the individual components 13 are connected by adhesive.

[0103] In this embodiment, the split part 13 is a 3D printed part. The overall precision of 3D printing is high, and the printing wall thickness can be very small. The overall consistency of the printed parallel holes 11 is high, and the printed parallel holes 11 can be made into relatively regular squares or regular hexagons, etc. Generally, there are no rounded corners between two adjacent surfaces of the parallel holes 11, which can be applied to scenarios with higher sensitivity, such as low-energy collimators.

[0104] In one example, see Figure 8 In two adjacent parts 13, the surface where one part 13 fits into the other part 13 is called the splicing surface 133. The splicing surface 133 includes a first region surface 1331 and a second region surface 1332. The first region surface 1331 is located above the second region surface 1332 along the height direction of the collimator body 1, and the first region surface 1331 and the second region surface 1332 are on different planes.

[0105] Please see Figure 8 In (a), two parts 13 are shown, and the splicing surface 133 on each part 13 is also shown. The splicing surface 133 includes a first region surface 1331 and a second region surface 1332, which are on different planes.

[0106] Due to errors in 3D printing technology and the splicing and fixing methods, gaps may exist between the two parts 13, posing a risk of radiation leakage during imaging and affecting sensitivity. Therefore, in this embodiment, the first region surface 1331 and the second region surface 1332 are on different planes, and there is a staggered layer in the height direction during splicing. In this way, when radiation enters through the gap between the first region surface 1331 of the two parts 13, the gap between the first region surface 1331 and the gap between the second region surface 1332 of the two parts 13 is misaligned, causing the invalid radiation entering through the gap between the first region surface 1331 of the two parts 13 to be absorbed, thereby avoiding the risk of radiation leakage during imaging.

[0107] Please see Figure 8 The diagram illustrates the splicing surface 133, which also includes a third region surface 1333. The third region surface 1333 connects the first region surface 1331 and the second region surface 1332. That is, the splicing surface 133 is composed of the first region surface 1331, the third region surface 1333, and the second region surface 1332. Figure 8 In the example, the first region surface 1331 and the second region surface 1332 are vertical surfaces, so that the splicing surface 133 forms a stepped structure. Alternatively, the first region surface 1331 and the second region surface 1332 may not be vertical surfaces, but may be inclined surfaces. In this case, the first region surface 1331 and the second region surface 1332 may or may not be parallel.

[0108] Figure 8 The splicing surface 133 is illustrated to be composed of a first region surface 1331, a third region surface 1333, and a second region surface 1332. In another example, the splicing surface 133 is composed of a first region surface 1331 and a second region surface 1332. In this case, the first region surface 1331 can be a vertical surface and the second region surface 1332 can be an inclined surface; or, the first region surface 1331 can be an inclined surface and the second region surface 1332 can be a vertical surface; or, both the first region surface 1331 and the second region surface 1332 can be inclined surfaces.

[0109] In one example, splicing surface 133 is not limited to... Figure 8 As shown, it can be composed of three or more regional surfaces, with each regional surface connected sequentially along the height direction. For example, two step structures are formed on the splicing surface 133, meaning that the splicing surface 133 can be composed of five regional surfaces.

[0110] Please see Figure 7 This illustrates that the collimator body 1 comprises two parts 13. When the collimator body 1 comprises two parts 13, a splicing surface 133 is formed on each part 13. Please refer to [link / reference]. Figure 8 This illustrates that the collimator body 1 comprises four parts 13. Figure 8 The diagram illustrates that each component 13 forms two splicing surfaces 133. When the collimator body 1 includes more components 13, the components 13 may form three or four splicing surfaces 133.

[0111] Preferably, please refer to Figure 7 and Figure 9The component 13 is in the shape of a cube; of course, the component 13 can also be in the shape of a triangular prism, for example, the collimator body 1 includes two components 13 that are in the shape of a triangular prism, which are assembled into a cuboid collimator body 1; or, for example, the collimator body 1 includes four components 13 that are in the shape of a triangular prism, which are assembled into a cuboid collimator body 1.

[0112] In one example, see Figure 10 The collimator body 1 includes a middle body part 14 and a protruding connecting part 15. The middle body part 14 is provided with a parallel hole 11, and the protruding connecting parts 15 are provided on two opposite sides of the middle body part 14. The split part 13 includes a split body 134 for splicing the middle body part 14 and a split protruding part 135 for splicing the protruding connecting part 15.

[0113] Please see Figure 10 The diagram shows the central main body 14 and the protruding connecting part 15. By providing the protruding connecting part 15, it can be connected to the frame of the SPECT equipment, thereby fixing the parallel hole collimator 100 on the frame.

[0114] Typically, the split body 13 is printed using tungsten alloy or bismuth alloy. The collimator body 1 made of tungsten alloy or bismuth alloy has high rigidity, so it can be connected to the frame of the SPECT equipment through the protruding connecting part 15 to realize the installation and fixation of the parallel hole collimator 100.

[0115] Please see Figure 10 The split part 13 includes a split main body 134 for splicing the intermediate main body 14 and a split protrusion 135 for splicing the protruding connecting part 15. Figure 10 Taking the collimator body 1 as an example, the two separate protrusions 135 are connected by a connector, thereby connecting the two separate parts 13. In this case, adhesive bonding is not required to connect the two separate parts 13. That is, when all parts 13 include a separate body 134 for splicing the middle main body 14 and separate protrusions 135 for splicing the protruding connecting parts 15, the splicing of each separate part 13 can be achieved by connecting the separate protrusions 135.

[0116] Of course, it is also possible to configure the partial body 13 to include a partial body 134 for splicing the middle main body 14 and a partial protrusion 135 for splicing the protruding connecting part 15. For example, in the example where the collimator body 1 includes four parts 13 that are generally triangular prisms, and the collimator body 1 is formed into a cuboid by splicing the four parts 13 that are generally triangular prisms (two parts 13 are arranged opposite each other along the length direction of the collimator body 1 and two parts 13 are arranged opposite each other along the width direction of the collimator body 1), that is, two of the parts 13 include a partial body 134 for splicing the middle main body 14 and a partial protrusion 135 for splicing the protruding connecting part 15, and the other two parts 13 only include a partial body 134 for splicing the middle main body 14.

[0117] Specifically, please see Figure 11 The parallel hole collimator 100 also includes a connecting plate 4, which is disposed on the upper end face, lower end face, or side face of the protruding connecting part 15. The separate protruding parts 135 and the connecting plate 4 are then connected by connectors to splice the various parts 13 together. See also... Figure 11 The diagram shows that the upper surfaces of the two protruding connecting parts 15 are each provided with a connecting plate 4.

[0118] For example, the connecting plate 4 is 3D printed, injection molded, or extruded.

[0119] In one example, the parallel hole collimator 100 also includes a sleeve assembly that is sleeved on the collimator body 1 to fix the individual parts 13.

[0120] For example, the fitting assembly includes a first fitting and a second fitting. The first fitting and the second fitting are connected to form a square tube. The fitting assembly is pressed against each of the individual parts 13 in the circumferential inner side to achieve the splicing of each of the individual parts 13 into the collimator body 1. At this time, it is not necessary to bond the individual parts 13 together, which makes it convenient to splice each of the individual parts 13 into the collimator body 1.

[0121] In another embodiment, when each component 13 is 3D printed, the collimator body 1 is formed by splicing the components 13, and all parallel holes 11 in the collimator body 1 are formed by splicing the components 13.

[0122] For example, each component 13 is 3D printed, and the collimator body 1 is divided into two or more parts along the height direction, and each part is formed by splicing each component 13 along the horizontal direction.

[0123] Please see Figures 12-15 In one embodiment, each component 13 is cast, the collimator body 1 is formed by splicing the components 13, and all parallel holes 11 in the collimator body 1 are formed by splicing the components 13.

[0124] In one example, the components 13 are arranged sequentially along the height direction of the collimator body 1 to form the collimator body 1; or, in another example, the collimator body 1 is divided into two or more parts along the height direction, and each part is formed by assembling the components 13 horizontally. The following mainly describes this embodiment using the example of assembling the components 13 sequentially along the height direction to form the collimator body 1.

[0125] Please see Figure 12 , Figure 12 This is a schematic diagram illustrating the process of assembling the collimator body when the components are 3D cast parts, as provided in this embodiment of the application. After each component 13 is cast, they are sequentially arranged along the height direction of the collimator body 1. Please refer to... Figure 12 , Figure 12 (a) illustrates two unconnected parts 13. Figure 12 (b) illustrates the two parts 13 that are joined together along the height direction.

[0126] Casting requires high precision in demolding. When the collimator body 1 is not formed by assembling the cast parts 13, but rather by casting the entire body as a single unit, the small wall thickness and small aperture of the collimator body 1 mean that if its height is relatively large, the holes are easily torn or damaged during demolding. Therefore, to facilitate demolding and improve the success rate, two or more parts 13 are cast, and the collimator body 1 is formed by assembling these parts along the height direction.

[0127] Please see Figure 12 The diagram illustrates that the collimator body 1 comprises two parts 13. The number of parts 13 is not limited to two; it can also be any number other than two. The same parallel hole 11 is formed by splicing together the parts 13 arranged along the height direction, thereby ensuring that all parallel holes 11 in the collimator body 1 are formed by splicing together the parts 13.

[0128] Please see Figure 12 Each component 13 has an opening 136, and the distribution of the openings 136 on each component 13 is the same, that is, the shape and size of the openings 136 on each component 13 are the same, and the positional distribution of the openings 136 on each component 13 is the same. Parallel holes 11 are formed by connecting the openings 136 along the same height direction in each component 13.

[0129] Preferably, each component 13 has the same height.

[0130] Regarding the connection of each component 13, in one example, two adjacent components 13 are glued together.

[0131] Regarding the casting process of split part 13, molten metal is poured into the mold cavity, and then another mold with several mandrel cores is inserted into the molten metal. After cooling for a period of time, the mold is removed to form split part 13.

[0132] In the casting process of the split body 13, a small radius (R-angle) is set on the edge of the core rod to facilitate demolding, and this radius must be within the acceptable range of sensitivity loss of the collimator body 1. In addition, because the diameter d of the parallel hole 11 and the wall thickness h of the hole wall 12 are too small, casting failure is likely to occur, resulting in a low yield. Therefore, they are generally used to prepare collimators with larger diameter d and wall thickness h of the hole wall 12, such as medium and high energy collimators.

[0133] See one example. Figure 13 The parallel hole collimator 100 also includes a base plate 2, the collimator body 1 is supported on the base plate 2, the base plate 2 is provided with a connecting hole 21, the shape of the connecting hole 21 is the same as the shape of the parallel hole 11, the distribution of the connecting hole 21 on the base plate 2 is the same as the distribution of the parallel hole 11 on the collimator body 1, and the connecting hole 21 corresponds one-to-one with the parallel hole 11; the base plate 2 has two opposite sides protruding from the collimator body 1 in the horizontal direction along the length or width direction respectively.

[0134] In this embodiment, the shape and size of the connecting hole 21 are the same as those of the parallel hole 11. The number of connecting holes 21 on the base plate 2 is the same as the number of parallel holes 11 on the collimator body 1. The positional relationship between the connecting holes 21 on the base plate 2 is the same as the positional relationship between the parallel holes 11 on the collimator body 1. The connecting holes 21 and the parallel holes 11 correspond one-to-one, that is, each connecting hole 21 is located directly below the corresponding parallel hole 11. Since the base plate 2 mainly supports the collimator body 1, it needs to have a certain strength. Therefore, the thickness of the base plate 2 cannot be too thin. However, a relatively large thickness will increase the radiation absorption capacity. Therefore, connecting holes 21 need to be provided on the base plate 2.

[0135] In this embodiment, the collimator body 1 is connected to the frame of the SPECT equipment via the base plate 2. Therefore, the base plate 2 is configured to have two opposite sides protruding from the collimator body 1 in the horizontal direction along the length or width direction.

[0136] Typically, the split part 13 is cast from molten lead alloy. Since solidified lead alloy is relatively soft and weak, it is preferable to set the hardness of the base plate 2 to be greater than that of the split part 13, so as to facilitate the stable fixing of the parallel hole collimator 100 on the frame of the SPECT equipment.

[0137] For example, the base plate 2 is made of carbon fiber, steel, or aluminum.

[0138] For example, the base plate 2 is cast.

[0139] For example, the thickness of the base plate 2 is preferably not less than 3 mm.

[0140] In one instance, please see Figure 13 and Figure 15 The parallel hole collimator also includes a protective cover 3. The bottom of the protective cover 3 is provided with an opening 31 for the collimator body 1 to be inserted. The collimator body 1 is covered inside the protective cover 3 and the bottom of the protective cover 3 is connected to the base plate 2.

[0141] In this embodiment, a protective cover 3 is provided to protect the main body 1 of the straightener.

[0142] Since the collimator body 1 is enclosed within the protective cover 3 and the bottom of the protective cover 3 is connected to the base plate 2, the various parts 13 can be confined together by the protective cover 3 and the base plate 2. That is, it is not necessary to connect the various parts 13; the protective cover 3 can be connected to the bottom of the base plate 2. At this time, the inner side of the protective cover 3 needs to contact the circumferential side of the parts 13 to prevent the parts 13 from shaking inside the protective cover 3.

[0143] In one example, each component 13 can be glued to the protective cover 3.

[0144] In one example, the individual components 13 are bonded together, and the lowest component 13 is bonded to the base plate 2. In this case, the circumferential side of the component 13 is in contact with the inner side of the protective cover 3, or there is a gap between the circumferential side of the component 13 and the inner side of the protective cover 3.

[0145] Preferably, the hardness of the protective cover 3 is greater than that of the split body 13, so as to facilitate the protection of the alignment device body 1.

[0146] Regarding the protective shield 3, see one example. Figure 15 The protective cover 3 is provided with a cover through hole 33 on the top plate 32 above the collimator body 1. The shape of the cover through hole 33 is the same as the shape of the parallel hole 11. The distribution of the cover through hole 33 on the protective cover 3 is the same as the distribution of the parallel hole 11 on the collimator body 1. The cover through hole 33 and the parallel hole 11 correspond one-to-one. Alternatively, in another example, the top plate 32 above the collimator body 1 of the protective cover 3 covers the opening 31 on the collimator body 1.

[0147] Since the protective cover 3 mainly serves a protective function, rather than a supporting function like the base plate 2, the protective cover 3 is preferably a thin plate. Therefore, whether or not to provide a through hole 33 on the protective cover 3 is mainly related to the material of the protective cover 3.

[0148] When the protective cover 3 is made of a material with low absorption rate, such as carbon fiber, the top plate 32 of the protective cover 3 above the collimator body 1 can cover the opening 31 on the collimator body 1. That is, when the protective cover 3 is made of a material with low absorption rate, it is not necessary to set the cover through hole 33 on the top plate 32, and the parallel hole collimator 100 can still be used normally. Since it is not necessary to set the cover through hole 33 on the protective cover 3, it is convenient to process the protective cover 3.

[0149] For example, when the material of the protective cover 3 is carbon fiber, the thickness of the protective cover 3 is preferably no more than 1 mm.

[0150] When the protective cover 3 is made of a material with a certain ability to absorb radiation, such as steel plate, a cover through hole 33 needs to be provided on the top plate 32 of the protective cover 3. Regarding the cover through hole 33, its shape and size are the same as the shape and size of the parallel hole 11. The number of cover through holes 33 on the top plate 32 is the same as the number of parallel holes 11 on the collimator body 1. The positional relationship between each cover through hole 33 on the top plate 32 is the same as the positional relationship between each parallel hole 11 on the collimator body 1. The cover through hole 33 corresponds one-to-one with the parallel hole 11, meaning each cover through hole 33 is located directly above its corresponding parallel hole 11.

[0151] For example, when the material of the protective cover 3 is steel plate, the thickness of the protective cover 3 is preferably no more than 0.5 mm.

[0152] When the protective cover 3 is made of aluminum plate, the choice of whether to provide a cover through hole 33 on the top plate 32 depends on the thickness of the top plate 32. For example, to ensure the normal operation of the parallel hole collimator 100, if the top plate 32 is relatively thin, it is not necessary to provide a cover through hole 33 on the top plate 32; if the top plate 32 is relatively thick, a cover through hole 33 is provided on the top plate 32.

[0153] For example, when the material of the protective cover 3 is aluminum plate, it is preferable that the thickness of the protective cover 3 is not greater than 0.5mm, for example, the thickness of the protective cover 3 is 0.2mm or 0.3mm.

[0154] Please see Figure 15 The base plate 2 protrudes horizontally from both sides of the protective cover 3 along its width direction. Figure 15 In the middle, the collimator body 1 is covered inside the protective cover 3.

[0155] Typically, the split part 13 is cast from molten lead alloy. However, lead is a toxic heavy metal, and prolonged contact with lead alloy without adequate protective measures can lead to poisoning. Therefore, in this embodiment, a protective cover 3 and a base plate 2 are added. The protective cover 3 and the base plate 2 confine the collimator body 1 made of lead alloy within the protective cover 3 and the base plate 2, preventing direct contact with the collimator body 1 when installing the parallel hole collimator 100, thereby improving safety.

[0156] The above provides three molding processes for the parallel-aperture collimator 100. Based on these three different molding processes, different types of parallel-aperture collimators 100 adopt corresponding molding processes. For example, low-energy collimators generally use thin-plate splicing and 3D-printed modular splicing of 13 parts, while medium- and high-energy collimators generally use cast lead modular splicing of 13 parts, etc. This parallel-aperture collimator 100 based on different molding processes can, on the one hand, meet the requirements of system sensitivity and spatial resolution, achieving higher imaging accuracy and image quality, and on the other hand, effectively reduce costs and improve product competitiveness and influence.

[0157] The above describes that all parts 13 in the same collimator body 1 are manufactured using the same processing and forming process. In one embodiment, some parts 13 in the same collimator body 1 are manufactured using different processing and forming processes.

[0158] Component 13 may be formed by casting; or, component 13 may be formed by 3D printing; or, component 13 may be formed by splicing thin plates. For example, in the same collimator body 1, some components 13 may be 3D printed, while the rest may be cast; or, in the same collimator body 1, some components 13 may be 3D printed, while the rest may be spliced ​​from thin plates; or, in the same collimator body 1, some components 13 may be cast, while the rest may be spliced ​​from thin plates; or, in the same collimator body 1, some components 13 may be cast, some may be spliced ​​from thin plates, and the rest may be 3D printed.

[0159] In an example where some components 13 in the same collimator body 1 are 3D printed and others are cast, specifically, the 3D printed components 13 are first joined together horizontally to form a whole, and then joined together with the cast components 13 vertically to form the collimator body 1. For example, the collimator body 1 includes one cast component 13 and two 3D printed components 13. The two 3D printed components 13 are joined together horizontally to form a whole, and then joined together with the other cast component 13 vertically.

[0160] Preferably, when the cast-formed part 13 is positioned below the 3D-printed part 13, see [reference needed]. Figure 13 and Figure 14The parallel hole collimator 100 also includes a base plate 2 and a protective cover 3 that cooperate with the cast split body 13. The protective cover 3 is placed inside the cast split body 13, the base plate is set below the protective cover 3 and connected to the protective cover 3, and then the 3D printed split body 13 is assembled as a whole and placed on the top surface of the protective cover 3.

[0161] Preferably, when the cast-formed part 13 is positioned above the 3D-printed part 13, see [reference needed]. Figure 10 The 3D-printed component 13 includes a main body 134 and a protruding part 135. The protruding part 135 of each 3D-printed component 13 facilitates connection with the frame of the SPECT device.

[0162] In the same collimator body 1, some parts 13 are 3D printed and some parts 13 are formed by splicing thin plates. For example, the 3D printed parts 13 are first spliced ​​horizontally to form a first whole, and then the parts 13 formed by splicing the thin plates are used as a second whole. Then the first whole and the second whole are spliced ​​along the height direction of the collimator body 1 to form the collimator body 1; or, the 3D printed parts 13 are first spliced ​​horizontally to form a first whole, and then the parts 13 formed by splicing the thin plates are used as a second whole. Then the first whole and the second whole are spliced ​​horizontally to form the collimator body 1; or, the 3D printed parts 13 can be one, and the parts 13 formed by splicing the thin plates are used as a first whole. Then the first whole and the 3D printed parts 13 are spliced ​​horizontally to form the collimator body 1.

[0163] In the same collimator body 1, some of the components 13 are cast, while the rest are formed by splicing thin plates. For example, the cast components 13 are first spliced ​​along the height direction to form a first whole, and then the components 13 formed by splicing the thin plates are used as a second whole. Then the first whole and the second whole are spliced ​​along the height direction of the collimator body 1 to form the collimator body 1. Alternatively, there is only one cast component 13. The component 13 formed by splicing the thin plates is used as a first whole, and then the cast component 13 and the first whole are spliced ​​along the height direction to form the collimator body 1.

[0164] In the same collimator body 1, some parts 13 are cast, some parts 13 are spliced ​​from thin plates, and the remaining parts 13 are 3D printed. For example, the cast parts 13 are spliced ​​along the height direction to form a first whole, and the 3D printed parts 13 are spliced ​​along the horizontal direction to form a second whole; then the parts 13 formed by splicing the thin plates are used as a third whole, and the first whole, the second whole, and the third whole are spliced ​​along the height direction to form the collimator body 1; or, there is one cast part 13 and one 3D printed part 13, the parts 13 formed by splicing the thin plates are used as the first whole, and then the first whole and the 3D printed part 13 are spliced ​​horizontally, and then spliced ​​with the cast part 13 along the height direction to form the collimator body 1.

[0165] For various examples of different processing and forming processes used for the partial components 13 within the same collimator body 1, when the component 13 formed by splicing the thin plates is considered as a whole, it can be as follows: Figure 6 The diagram illustrates the assembly process of the collimator body 1.

[0166] For various examples of different processing and molding processes used for the partial parts 13 in the same collimator body 1, when the partial parts 13 are spliced ​​together in the horizontal direction to form a whole, preferably, in two adjacent 3D printed partial parts 13, the surface where one partial part 13 fits into the other partial part 13 is the splicing surface 133. The splicing surface 133 includes a first area surface 1331 and a second area surface 1332. The first area surface 1331 is located above the second area surface 1332 along the height direction of the collimator body 1, and the first area surface 1331 and the second area surface 1332 are on different planes.

[0167] This application provides a scanning device, including the parallel hole collimator 100 provided in any of the above embodiments.

[0168] The structure of the parallel aperture collimator 100 has been described above and will not be repeated here. The collimator body 1 provided in this embodiment is formed by splicing together various components 13, which improves the forming efficiency of the parallel aperture collimator 100, ensures high precision and high image quality, meets resolution and sensitivity requirements, while reducing costs and increasing efficiency. It can be widely used in medical products.

[0169] The scanning device works by introducing radiolabeled drugs into the patient's body. These drugs accumulate in specific organs or tissues. The device then detects the gamma rays emitted by the radiopharmaceuticals, and through computer processing and reconstruction, generates functional images of the body's internal organs and tissues.

[0170] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A parallel-hole collimator, characterized in that, The system includes a collimator body (1), on which a plurality of parallel holes (11) are provided, and between two adjacent parallel holes (11) there is a hole wall (12), and the thickness of the hole wall (12) is the same at each location on the collimator body (1); The collimator body (1) includes two or more parts (13), the collimator body (1) is formed by splicing together each of the parts (13), and at least part of the parallel holes (11) are formed by splicing together the parts (13); In two adjacent components (13), the surface where one component (13) fits into the other component (13) is called the splicing surface (133). The splicing surface (133) includes a first region surface (1331) and a second region surface (1332). The first region surface (1331) is positioned above the second region surface (1332) along the height direction of the collimator body (1), and the first region surface (1331) and the second region surface (1332) are on different planes.

2. The parallel hole collimator as described in claim 1, characterized in that, The two adjacent parts (13) are bonded together.

3. The parallel hole collimator as described in claim 1, characterized in that, Each of the aforementioned components (13) is 3D printed.

4. The parallel hole collimator as described in claim 1, characterized in that, The collimator body (1) includes a middle body part (14) and a protruding connecting part (15). The middle body part (14) is provided with the parallel hole (11), and the protruding connecting part (15) is provided on two opposite sides of the middle body part (14). At least part or all of the split parts (13) include a split body part (134) for splicing the middle body part (14) and a split protruding part (135) for splicing the protruding connecting part (15).

5. The parallel hole collimator as described in claim 1, characterized in that, The parallel hole collimator also includes a sleeve assembly, which is used to sleeve the collimator body (1) to fix each of the sub-body (13).

6. The parallel hole collimator as described in claim 1, characterized in that, Each of the aforementioned components (13) is formed by casting.

7. The parallel hole collimator as described in claim 1, characterized in that, The parallel hole collimator also includes a base plate (2), the collimator body (1) is supported on the base plate (2), the base plate (2) is provided with a connecting hole (21), the shape of the connecting hole (21) is the same as the shape of the parallel hole (11), the distribution of the connecting hole (21) on the base plate (2) is the same as the distribution of the parallel hole (11) on the collimator body (1), and the connecting hole (21) corresponds one-to-one with the parallel hole (11); the base plate (2) protrudes from the collimator body (1) on both sides opposite to each other in the length or width direction in the horizontal direction.

8. The parallel hole collimator as described in claim 7, characterized in that, The parallel hole collimator also includes a protective cover (3), the bottom of which is provided with an opening (31) for the collimator body (1) to be inserted, the collimator body (1) is covered inside the protective cover (3) and the bottom of the protective cover (3) is connected to the base plate (2). The protective cover (3) is provided with a cover through hole (33) on the top plate (32) above the collimator body (1). The shape of the cover through hole (33) is the same as the shape of the parallel hole (11). The distribution of the cover through hole (33) on the protective cover (3) is the same as the distribution of the parallel hole (11) on the collimator body (1), and the cover through hole (33) corresponds one-to-one with the parallel hole (11); or, the top plate (32) of the protective cover (3) above the collimator body (1) covers the opening (31) on the collimator body (1).

9. The parallel hole collimator as described in claim 8, characterized in that, The split body (13) is formed by casting molten lead alloy; the hardness of the protective cover (3) and the base plate (2) are both greater than the hardness of the split body (13).

10. The parallel hole collimator as described in claim 1, characterized in that, In the same collimator body (1), the molding process of some of the split parts (13) is different from that of the other split parts (13).

11. The parallel hole collimator as described in claim 10, characterized in that, The component (13) is formed by casting; or, the component (13) is formed by 3D printing; or, the component (13) is formed by splicing thin plates.

12. A scanning device, characterized in that, Includes the parallel hole collimator according to any one of claims 1-11.

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