Quickly-assembled high-precision PET (positron emission tomography) imaging device

Abstract

The invention belongs to the technical field of medical imaging, and particularly provides a fast-assembly high-precision PET imaging device which comprises a PET detection ring and a PET detector. A mounting groove is formed in the end face of the PET detection ring, and a positioning bulge is arranged on the side wall of the mounting groove; the PET detector is arranged in the mounting groove, a positioning groove is formed in the side face of the PET detector, and the positioning groove is matched with the positioning protrusion. According to the PET imaging device, the positioning protrusions and the positioning grooves are arranged, so that a guiding effect can be achieved on installation of the PET detector, the PET detector rapidly slides into the installation groove of the PET detection ring, accurate positioning and fixing of the PET detector are achieved, the assembling complexity and repeated positioning errors of the PET imaging device are remarkably reduced, and the assembling efficiency of the PET imaging device is greatly improved.

Description

Technical Field

[0001] This application belongs to the field of medical imaging technology, and more specifically, relates to a rapid assembly high-precision PET imaging device. Background Technology

[0002] Positron emission tomography (PET), one of the most advanced functional molecular imaging techniques available today, uses the injection of radiopharmaceuticals into organisms. By utilizing the drug's ability to accumulate and decay in target areas, it enables dynamic imaging of metabolic processes. PET imaging technology has significant clinical applications in oncology, neuroscience, and cardiovascular diseases.

[0003] In the field of medical imaging technology, the performance of PET imaging devices directly affects the accuracy and efficiency of diagnosis. Traditional PET equipment has many shortcomings in the assembly process of the detector module, such as cumbersome installation steps, long time consumption, and difficulty in guaranteeing accuracy, which greatly limits its widespread application in clinical and research fields. Summary of the Invention

[0004] The purpose of this application is to provide a rapid assembly of a high-precision PET imaging device to solve the technical problems of complex and time-consuming assembly of traditional PET imaging devices in the prior art.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: a high-precision PET imaging device for rapid assembly is provided, including a PET detection ring and a PET detector; the end face of the PET detection ring is provided with a mounting groove, and the side wall of the mounting groove is provided with a positioning protrusion; the PET detector is disposed in the mounting groove, and the side of the PET detector is provided with a positioning groove, the positioning groove matching the positioning protrusion.

[0006] Furthermore, the PET detection ring is provided in multiple parts, and the multiple PET detection rings are connected sequentially along the axial direction of the PET detection ring.

[0007] Furthermore, the PET detection ring has a first end face and a second end face that are arranged opposite to each other. One of the two end faces has a mounting groove and the other end face has a mounting protrusion. In two adjacent PET detection rings, the mounting groove of one PET detection ring engages with the mounting protrusion of the other PET detection ring.

[0008] Furthermore, the PET detection ring is provided with mounting holes that penetrate the first end face and the second end face; the mounting holes of multiple PET detection rings are connected in sequence; the rapid assembly high-precision PET imaging device also includes fasteners that are connected to multiple PET detection rings at the mounting holes.

[0009] Furthermore, the mounting holes are provided in multiple manner, and the multiple mounting holes are distributed in a ring array on the end face of the PET detection ring.

[0010] Furthermore, the mounting slots are provided in multiples, and the multiple mounting slots are distributed in a ring array on the end face of the PET detection ring.

[0011] Furthermore, the end face of the PET detection ring is provided with a notch, which penetrates the outer side wall and the inner side wall of the PET detection ring. The notch is interconnected with the mounting groove and is located on the same end face of the PET detection ring. The notch is used to connect the signal line of the PET detector through which it passes.

[0012] Furthermore, the notch is provided in multiple ways, and the multiple notches are distributed in a ring array on the end face of the PET detection ring, and the multiple notches are staggered with the multiple mounting grooves.

[0013] Furthermore, the PET detection ring is manufactured using 3D printing technology.

[0014] Furthermore, the PET detection ring is made of non-metallic resin material.

[0015] The beneficial effects of the rapid assembly high-precision PET imaging device provided in this application are as follows: Compared with the prior art, in this application, by setting positioning protrusions and positioning grooves, the installation of the PET detector can be guided, allowing the PET detector to slide quickly into the mounting groove of the PET detector ring, realizing the precise positioning and fixing of the PET detector, significantly reducing the assembly complexity and repeatability error of the PET imaging device, and greatly improving the assembly efficiency of the PET imaging device. Attached Figure Description

[0016] 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.

[0017] Figure 1 A three-dimensional structural diagram of the PET detector ring in the rapid assembly high-precision PET imaging device provided in this application embodiment. Figure 1 ;

[0018] Figure 2 A three-dimensional structural diagram of the PET detector ring in the rapid assembly high-precision PET imaging device provided in this application embodiment. Figure 2 ;

[0019] Figure 3 for Figure 1 Enlarged view of part A in the diagram;

[0020] Figure 4 This is a schematic diagram of the front view structure of the PET detector ring in the rapid assembly high-precision PET imaging device provided in the embodiments of this application;

[0021] Figure 5 A rear view schematic diagram of the PET detection ring in the rapid assembly high-precision PET imaging device provided in the embodiments of this application;

[0022] Figure 6 Point source two-dimensional projection during three-dimensional reconstruction of the rapid assembly high-precision PET imaging device provided in the embodiments of this application;

[0023] Figure 7 The projection of the imaging result of the rapid assembly high-precision PET imaging device provided in the embodiments of this application in the X direction;

[0024] Figure 8 The projection of the imaging result of the rapid assembly high-precision PET imaging device provided in the embodiments of this application in the Y direction;

[0025] Figure 9 A comparison of crystal resolution when the magnetic resonance system is turned on and off in the rapid assembly high-precision PET imaging device provided in the embodiments of this application.

[0026] The following are the labeling elements in the figure:

[0027] 100-PET detection ring; 101-Mounting groove; 111-Positioning protrusion; 102-Mounting groove; 103-Mounting protrusion; 104-Mounting hole; 105-Notch. Detailed Implementation

[0028] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0029] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0030] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0032] Please refer to the following: Figure 1 and Figure 3 The rapid assembly high-precision PET imaging device provided in this application embodiment will now be described. This rapid assembly high-precision PET imaging device includes a PET detection ring 100 and a PET detector (not shown); the end face of the PET detection ring 100 is provided with a mounting groove 101, and the side wall of the mounting groove 101 is provided with a positioning protrusion 111; the PET detector is disposed in the mounting groove 101, and the side of the PET detector is provided with a positioning groove (not shown), which matches the positioning protrusion 111.

[0033] Compared with the prior art, the rapid assembly high-precision PET imaging device provided in this application provides a guide for the installation of the PET detector by setting the positioning protrusion 111 and the positioning groove, so that the PET detector can quickly slide into the mounting groove 101 of the PET detector ring 100, realizing the precise positioning and fixing of the PET detector, significantly reducing the assembly complexity and repeatability error of the PET imaging device, and greatly improving the assembly efficiency of the PET imaging device.

[0034] In one embodiment of this application, a plurality of PET detection rings 100 are provided, and the plurality of PET detection rings 100 are connected sequentially along the axial direction of the PET detection rings 100.

[0035] In this embodiment, the sequential connection of multiple PET probe rings 100 effectively expands the imaging range of the PET imaging device while maintaining structural compactness and stability. This approach is suitable for rapid expansion from single-layer PET testing to multi-layer PET systems, and is particularly well-suited for parallel verification of multiple schemes in scientific research scenarios.

[0036] In one embodiment of this application, the PET detection ring 100 has a first end face and a second end face that are disposed opposite to each other, please refer to both. Figure 4 and Figure 5 Of the two end faces, the first end face and the second end face, one end face is provided with a mounting groove 102 and the other end face is provided with a mounting protrusion 103; of the two adjacent PET detection rings 100, the mounting groove 102 of one PET detection ring 100 is engaged with the mounting protrusion 103 of the other PET detection ring 100.

[0037] In this embodiment, the snap-fit ​​connection between the mounting protrusion 103 and the mounting groove 102 not only ensures a stable connection between adjacent PET detection rings 100 but also effectively prevents loosening caused by vibration or external interference. The design of the mounting groove 102 and the mounting protrusion 103 simplifies the assembly process while maintaining connection strength, eliminating the need for additional tools or complex procedures. Furthermore, the mounting protrusion 103 and the mounting groove 102 provide positioning guidance for the installation of adjacent PET detection rings 100, ensuring precise alignment between them and improving the overall assembly accuracy. This design is particularly important in multilayer PET systems, effectively reducing imaging errors caused by improper connections and further enhancing the system's reliability and stability.

[0038] It is understandable that multiple mounting protrusions 103 and mounting grooves 102 can be provided. Multiple mounting protrusions 103 are distributed in a ring array on the end face of the PET detection ring 100, and mounting grooves 102 are provided in a one-to-one correspondence. In practical applications, this multi-point distribution design can significantly improve the uniformity and stability of the connection. Since the number of mounting protrusions 103 and grooves can be adjusted according to specific needs, they can be flexibly configured according to different equipment specifications and usage scenarios, thereby meeting diverse assembly requirements.

[0039] In one embodiment of this application, please refer to the following: Figure 4 and Figure 5 The PET detection ring 100 is provided with a mounting hole 104, which penetrates the first end face and the second end face; the mounting holes 104 of the multiple PET detection rings 100 are connected in sequence; the rapid assembly of the high-precision PET imaging device also includes fasteners, which are connected to the multiple PET detection rings 100 at the mounting holes 104.

[0040] In this embodiment, by providing mounting holes 104 penetrating the first and second end faces, not only can a stable connection be achieved between multiple PET detection rings 100, but the overall structural compactness is also further improved. The use of fasteners makes the assembly process more convenient, allowing the fixing of multiple PET detection rings 100 to be completed without additional complex operations. In addition, the design of the mounting holes 104 can effectively reduce connection loosening problems caused by external vibration or impact, thereby improving the reliability and stability of the system. This structure is particularly important in multilayer PET systems, ensuring precise alignment between layers, avoiding imaging errors caused by poor connections, and thus improving imaging quality and efficiency.

[0041] In one embodiment of this application, please refer to the following: Figure 4 and Figure 5 Multiple mounting holes 104 are provided, and the multiple mounting holes 104 are distributed in a ring array on the end face of the PET detection ring 100.

[0042] In this embodiment, by distributing multiple mounting holes 104 in a ring array, the structural strength and stress uniformity of the PET detection ring 100 can be further optimized. This design not only effectively disperses external stress but also improves the overall assembly stability, especially in multi-layer stacking. Furthermore, the ring array of mounting holes 104 provides greater flexibility for fastener installation, facilitating adjustments to the assembly method according to different needs. This layout ensures a strong connection while reducing over-reliance on individual mounting holes 104, thereby extending the device's service life and reducing maintenance costs.

[0043] Specifically, the mounting hole 104 can be a threaded hole, and correspondingly, the fastener is a screw (bolt) to securely fix multiple PET detection rings 100 through threaded connection. This threaded connection method not only provides high connection strength but also facilitates disassembly and reuse, thereby improving the flexibility and maintainability of the device.

[0044] In another embodiment of this application, the mounting hole 104 can also be a pin hole, and correspondingly, the fastener is a pin shaft. The connection of multiple PET detection rings 100 is achieved through the cooperation of the pin shaft and the pin hole. This connection method has high positioning accuracy and can effectively avoid displacement problems caused by vibration or external impact, thereby further improving the stability and reliability of the overall structure.

[0045] In one embodiment of this application, please refer to the following: Figure 1 and Figure 4 Multiple mounting slots 101 are provided, and the multiple mounting slots 101 are distributed in a ring array on the end face of the PET detection ring 100.

[0046] In this embodiment, by providing multiple mounting slots 101, multiple PET detectors can be installed, with one PET detector installed in each slot 101. This design significantly improves the detection efficiency and coverage of the PET imaging device. The multiple mounting slots 101 are arranged in a circular array, which not only optimizes space utilization but also ensures uniform spacing between each PET detector, thereby achieving more accurate data acquisition. Furthermore, this layout effectively reduces signal interference, improves image quality, and provides more reliable basic data support for subsequent image processing.

[0047] In one embodiment of this application, please refer to the following: Figure 1 and Figure 2 The PET detection ring 100 has a notch 105 on its end face. The notch 105 penetrates the outer side wall and the inner side wall of the PET detection ring 100. The notch 105 is connected to the mounting groove 101 and is located on the same end face of the PET detection ring 100.

[0048] In this embodiment, the notch 105 serves multiple functions. First, it facilitates heat dissipation within the device, improving the heat dissipation efficiency of the PET imaging device. Second, by reducing the contact area between the electronic components on both sides of the PET detector and the device structure, the notch 105 effectively avoids the risk of damage to components due to mechanical compression during installation or operation. Furthermore, the notch 105 provides ample operating space for signal cable connection and maintenance, facilitating not only the insertion and removal of signal cables but also subsequent troubleshooting and timely replacement of damaged signal cables. Simultaneously, this structure helps to achieve orderly arrangement of signal cables, avoiding electromagnetic interference or image quality degradation caused by messy wiring, further ensuring the stability and reliability of the system.

[0049] The signal line is used to transmit the signal output from the PET detector to the system's signal acquisition circuit board to complete the PET imaging function. The PET imaging device designed in this way can be used for independent imaging, and it also has the ability to be integrated with other imaging systems such as magnetic resonance imaging systems, effectively improving the richness of imaging information and diagnostic accuracy, and expanding its application scenarios in medical imaging and scientific research.

[0050] Specifically, the end face of the PET probe ring 100 can be provided with an end cap, and a positioning hole is reserved on the end cap. Physical integration with the MRI or CT (Computed Tomography) system is achieved by connecting fasteners (such as screws), thereby ensuring the accurate positioning of the PET imaging device in multimodal imaging. It is suitable for multimodal imaging applications such as small animal experiments and preclinical imaging.

[0051] In one embodiment of this application, please refer to the following: Figure 1 and Figure 2 Multiple notches 105 are provided, and the multiple notches 105 are distributed in a ring array on the end face of the PET detection ring 100, and the multiple notches 105 and multiple mounting grooves 101 are staggered with each other.

[0052] In this embodiment, by staggering the multiple notches 105 with the multiple mounting slots 101, the spatial layout of the end face of the PET detector ring 100 can be further optimized, improving the compactness and functionality of the overall structure. This arrangement ensures that one mounting slot 101 corresponds to one notch 105, facilitating the connection of a separate signal line to each PET detector. This design not only effectively avoids mutual interference between signal lines but also improves the flexibility and efficiency of wiring. The staggered arrangement makes the signal transmission path of each PET detector clearer and more independent, thereby ensuring the accuracy and stability of data acquisition.

[0053] In one embodiment of this application, the PET detection ring 100 is manufactured using 3D printing technology.

[0054] In this embodiment, the PET detection ring 100 is fabricated using 3D printing technology, enabling high-precision molding of complex structures while significantly shortening the production cycle. Compared to traditional processing methods, 3D printing technology allows for flexible adjustment of the internal structure and external features of the PET detection ring 100 according to design requirements, eliminating the need for additional mold costs. This makes it particularly suitable for rapid iteration and customized production during the research phase. Furthermore, 3D printing technology ensures the consistency and precision of the PET detection ring 100, reducing assembly problems caused by manufacturing errors, thereby further improving the overall performance and reliability of the device.

[0055] Specifically, 3D printing technologies can be selected from DLP (Digital Light Processing) or SLA (Stereo Lithography Appearance), both of which can achieve high-precision molding results. DLP technology uses a digital light projector to expose the image of the entire layer onto liquid resin in a single step, resulting in fast molding speed and high precision, making it suitable for fabricating the PET probe ring 100 structure with complex details. SLA technology, on the other hand, uses a laser to scan the liquid resin point by point to solidify it, achieving even higher molding precision, and is particularly suitable for parts with strict requirements for surface smoothness and detail. Selecting the appropriate 3D printing technology based on actual needs can further optimize the manufacturing process of the PET probe ring 100, improve production efficiency, and reduce costs.

[0056] Understandably, in existing technologies, the fabrication of PET probe rings 100 typically employs CNC (Computer Numerical Control) machining, with a production cycle generally ranging from several days to a week. Even for simple PET probe ring structures, finishing and post-processing usually require 1-3 days. In contrast, this embodiment utilizes photopolymer SLA or DLP processes for rapid prototyping, shortening the time from design to molding to just a few hours. It enables the printing of complex structures without the need for mold making, significantly improving the product's rapid iteration capabilities and verification efficiency, and substantially reducing upfront development costs.

[0057] The spatial resolution of a PET imaging device is highly dependent on the spatial arrangement accuracy of the PET detectors. The PET detector ring 100, fabricated using 3D printing technology, improves the machining accuracy of the mounting slots 101, reduces positional errors between multiple mounting slots 101, and controls the relative positional deviation between PET detectors within ±0.2mm. By arranging multiple pairs of PET detectors in a ring to cover a wide solid angle, combined with a high-time-resolution readout circuit, sub-millimeter (<1mm) spatial resolution can be achieved, meeting the requirements for high-precision PET imaging of small animals or the brain.

[0058] In one embodiment of this application, the PET detection ring 100 is made of non-metallic resin material.

[0059] In this embodiment, the non-metallic resin material has a low radiation absorption rate, which can effectively reduce interference with the PET detector signal, thereby improving image quality. Furthermore, this material possesses good mechanical strength and heat resistance, maintaining stable physical properties in complex experimental environments. The selection of a non-metallic resin material also significantly reduces processing difficulty and cost, while avoiding the magnetic interference problems that may be introduced by metallic materials, providing more ideal conditions for high-precision imaging. In practical applications, this material selection also facilitates subsequent process optimization and equipment maintenance.

[0060] Specifically, non-metallic resin materials can be selected from engineering resins with low thermal expansion coefficients, SLA photocurable resins, carbon fiber reinforced resins, high-strength resins, flexible resins, high-temperature resins, and casting resins. These materials all have good electromagnetic transparency and low magnetic sensitivity, which effectively avoids artifacts or interference in the strong magnetic environment of MRI and ensures stable operation of the system during multimodal imaging.

[0061] In this embodiment, the PET detection ring 100 is made of non-metallic resin material, which also reduces the friction coefficient of the PET detection ring 100 surface. The matching accuracy between the PET detection ring 100 and the PET detector is less than 0.1 mm. During the assembly process of the PET imaging device, combined with the design of the positioning groove and the positioning protrusion 111, the PET detector can slide into the mounting groove 101 of the PET detection ring 100 more quickly, ensuring that all PET detectors on a single PET detection ring 100 can be assembled within 10 minutes.

[0062] The rapid assembly high-precision PET imaging device provided in this application has been proven feasible and effective through preliminary experiments and simulations. The rapid assembly high-precision PET imaging device (hereinafter referred to as the PET imaging device) uses 12 PET detectors to form a single ring and achieves single-point source imaging through signal transmission via a data cable. Adaptability experiments under magnetic resonance environments have also been conducted, demonstrating the device's ability to operate stably in such environments.

[0063] Single-source imaging: After assembling 12 PET detectors into a PET imaging device, the device is activated to collect gamma photon events excited by a point source. Combining this with the crystal resolution map of the PET imaging device, the crystal number information corresponding to each event is extracted from each PET detector. Using a pre-calibrated crystal spatial coordinate table and a DOI (Digital Object Identifier) ​​hierarchical algorithm, the absorption positions of each pair of matching events' gamma photons are mapped to three-dimensional spatial coordinates, thus achieving precise localization.

[0064] Based on 3D coordinates, the corresponding Line of Response (LOR) is reconstructed. A simple back-projection 3D reconstruction is then performed on the 3D LORs according to statistical principles. A sine curve is calculated for each reconstructed LOR, and image reconstruction is performed using the Ordered Subsets Expectation Maximization (OSEM) method. The final reconstructed point source 2D projection is shown below. Figure 6 As shown, the center coordinates of its XY projection are (0.21, 0.21), which is very small compared to the actual position (0, 0), with an offset distance of less than 0.29 mm. This indicates that the PET imaging device has good spatial resolution and positioning accuracy. Figure 7 The projection of the imaging result in the X direction. Figure 8 This is the projection of the imaging result in the Y direction.

[0065] Magnetic compatibility performance testing: A comparative experiment was conducted with the MRI radio frequency signal enabled and in a non-magnetic field environment. The output signal of the PET detector loop was acquired to study the interference of the 9.4T MRI system on the normal readout process of the PET detector.

[0066] The PET imaging device operated normally with the MRI sequence enabled, and its crystal resolution image was essentially the same as when the MRI system was disabled. All 28 rows and columns in the crystal resolution image were clearly distinguishable, and no significant performance degradation or signal interference was observed, meeting the compatibility requirements for multimodal imaging. A crystal resolution image of one PET detector is shown below; please refer to [link / reference]. Figure 9 , Figure 9 The image above is a crystal-resolution image acquired when the MRI system is not turned on. Figure 9 The image below is a crystal resolution image acquired when the MRI system is turned on.

[0067] like Figure 6 As shown, experimental results demonstrate that the PET imaging device provided in this application embodiment can complete high-precision assembly in a short time, while also meeting the compatibility requirements of multimodal imaging.

[0068] The rapid assembly high-precision PET imaging device provided in this application has the following advantages compared with the prior art:

[0069] (1) Rapid assembly: By setting positioning grooves and positioning protrusions 111, a single PET detector ring 100 can be rapidly assembled within 10 minutes, which significantly reduces the assembly complexity and repetitive positioning error of the PET imaging device.

[0070] (2) High-precision alignment: The PET detector ring 100 is made by high-precision 3D printing technology, which improves the positional accuracy between multiple mounting slots 101 and realizes that the relative positional deviation between PET detectors is controlled within ±0.2mm, meeting the requirements of sub-millimeter spatial resolution.

[0071] (3) Rapid prototyping and low-cost manufacturing: Using 3D printing technology, the entire process from design to molding of the PET detection ring 100 can be completed within 6 hours, which has obvious time and economic advantages compared with traditional manufacturing processes.

[0072] (4) Modular design: By setting mounting holes 104, mounting protrusions 103 and mounting grooves 102, multiple PET detection rings 100 can be quickly spliced ​​and expanded, simplifying the multi-layer system construction process and ensuring three-dimensional registration accuracy.

[0073] (5) Compactness and multimodal compatibility: The PET imaging device adopts a compact ring structure design, which has good magnetic compatibility performance and can operate stably in the magnetic resonance environment. At the same time, an end cap is set at the end of the PET imaging device, and a positioning hole is reserved on the end cap. Physical integration with the MRI or CT system is achieved by connecting fasteners, thereby ensuring the accurate positioning of the PET detector in multimodal imaging. It is suitable for multimodal imaging applications such as small animal experiments and preclinical imaging.

[0074] 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 rapid assembly high-precision PET imaging device, characterized in that, include: A PET detection ring, wherein a mounting groove is provided on the end face of the PET detection ring, and a positioning protrusion is provided on the side wall of the mounting groove; A PET detector is disposed in the mounting slot, and a positioning groove is provided on the side of the PET detector, which matches the positioning protrusion.

2. The rapid assembly high-precision PET imaging device as described in claim 1, characterized in that, The PET detection ring is provided in multiple parts, and the multiple PET detection rings are connected sequentially along the axial direction of the PET detection ring.

3. The rapid assembly high-precision PET imaging device as described in claim 2, characterized in that, The PET detection ring has a first end face and a second end face that are arranged opposite to each other. One of the two end faces has a mounting groove and the other end face has a mounting protrusion. In two adjacent PET detection rings, the mounting groove of one PET detection ring engages with the mounting protrusion of the other PET detection ring.

4. The rapid assembly high-precision PET imaging device as described in claim 3, characterized in that, The PET detection ring is provided with a mounting hole that penetrates the first end face and the second end face; the mounting holes of multiple PET detection rings are connected in sequence; the rapid assembly high-precision PET imaging device also includes fasteners that are connected to multiple PET detection rings at the mounting holes.

5. The rapid assembly high-precision PET imaging device as described in claim 4, characterized in that, The mounting holes are provided in a plurality of manner, and the plurality of mounting holes are arranged in a ring array on the end face of the PET detection ring.

6. The rapid assembly high-precision PET imaging device as described in claim 1, characterized in that, The mounting slots are provided in multiple ways, and the multiple mounting slots are distributed in a ring array on the end face of the PET detection ring.

7. The rapid assembly high-precision PET imaging device as described in claim 6, characterized in that, The PET detection ring has a notch on its end face, which penetrates the outer and inner side walls of the PET detection ring. The notch is connected to the mounting groove and is located on the same end face of the PET detection ring.

8. The rapid assembly high-precision PET imaging device as described in claim 7, characterized in that, The notches are provided in multiples, and the multiple notches are distributed in a ring array on the end face of the PET detection ring, and the multiple notches are staggered with the multiple mounting grooves.

9. The rapid assembly high-precision PET imaging device according to any one of claims 1-8, characterized in that, The PET detection ring is made using 3D printing technology.

10. The rapid assembly high-precision PET imaging device as described in claim 9, characterized in that, The PET detection ring is made of non-metallic resin material.

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