A PET integrated detector ring based on 3D printing technology

Abstract

The application discloses a PET integrated detector ring based on a 3D printing technology, which is characterized by comprising a 3D printed detector ring, detectors and a fixing device of the detectors; the detector ring comprises a plurality of side walls, each of which is provided with a mounting position of a detector and a detector fixing hole for embedding and fixing a detector; the mounting position is parallel to the axial direction of the detector ring; the center of the detector ring serves as a scanning channel; the fixing device of the detector comprises a fixing piece and a fastener, the fixing piece is used for connecting and fixing a circuit board of the inserted detector, and the fastener is fastened with the detector ring. The application embeds the detector into the integrated detector ring directly, achieves the purpose of more accurately positioning the relative positions among the multiple detectors, reduces the positioning error and is favorable for improving the imaging spatial resolution of the system.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical imaging equipment, and in particular to an integrated PET detector ring based on 3D printing technology. BACKGROUND

[0002] PET (positron emission tomography) is an imaging device that reflects the gene, molecule, metabolism and functional state of the lesion. The working principle of PET: using a tracer labeled with a positron emitting radionuclide to decay and annihilate in the body, producing a pair of 511 keV gamma rays emitted back to back. Through coincidence detection and reconstruction algorithm, the distribution of the tracer can be quantitatively imaged in situ and non-invasively under normal physiological conditions of the organism.

[0003] The most core part of PET is the gamma ray detector, which is generally composed of a scintillation crystal, a light guide, a photodetector device, and readout electronics. The scintillation crystal converts the 511 keV high-energy gamma rays into a large number of visible light photons. The visible light photons propagate to the photodetector device through the light guide and are converted into a large number of electrons through the photoelectric effect and electron multiplication in the photodetector device, and are finally processed by the readout electronics. The role of the detector is to accurately record the position of the gamma ray interaction in the scintillation crystal, the deposited energy and the time point of the interaction. In order to accurately record these data, the accuracy of the installation position of the detector is very important. If the installation position of the detector has a large error, it will cause the spatial resolution of the PET instrument (the most important performance indicator of PET imaging) to deteriorate.

[0004] In the installation process of the traditional PET detector ring, there are some challenges and limitations. The traditional method of assembling the detector ring is to install each detector on the equipment rack in a ring-shaped arrangement through mechanical connection (such as screw fixation), so the accuracy of ring installation positioning depends on the accuracy of mechanical connection installation of each detector. Manual operation depends on the skill and experience of workers, which may cause fluctuations in installation quality and repeatability. The non-contact of the small gap between adjacent detectors further increases the complexity of installation. After completing the ring structure, fine tuning and correction are needed to ensure the position accuracy of the detectors, which not only takes time and effort, but also may introduce installation deviations due to human factors. These challenges highlight the problems of low efficiency and difficulty in ensuring accuracy in the traditional installation method.

[0005] 3D printing technology (3D printing) is a kind of rapid prototyping material technology, which is a technology that uses powder-like metal or plastic and other materials that can be bonded to construct objects through layer-by-layer printing based on digital model files. This technology is different from traditional manufacturing technology, which can use less raw materials to manufacture customized products at lower cost and higher efficiency according to actual use needs. Compared with traditional manufacturing methods, 3D printing technology can manufacture more complex structures without the limitations of molds and processing techniques. Thus, various products can be designed, and 3D printing can quickly realize the process from design to production without being limited by processing time, greatly improving production efficiency. The 3D printing technologies widely used in long-term practice are the light solidification molding process (Stereolithography Appearance, SLA), the selective laser sintering process (Selective Laser Sintering, SLS) and the fused deposition modeling method (Fused Deposition Modeling, FDM), among which the light solidification molding process (SLA) can print parts with high detail, smooth surface finish and strict tolerance. SUMMARY

[0006] The purpose of the present application is to provide a PET integrated detector ring based on 3D printing technology, which solves the positioning deviation and installation complexity of the existing technology when the PET detectors are installed into a ring structure one by one, and the complex difficulties of traditional mechanical processing of complete detector rings. By directly printing the entire detector ring and fixing and limiting the positions of all detectors through the internal structure of the detector ring, the detectors (including crystals, photodetectors and circuits, but not including shells) are directly embedded into the "integrated" detector ring, achieving more accurate positioning of the relative positions of multiple detectors, so that the detectors are more "perfectly" arranged in a circular ring shape, reducing the positioning error; the accurate positioning of the detectors is beneficial to improve the imaging spatial resolution of the system. The sensitive area of the detector for detecting gamma photons can also be designed in other shapes, not limited to a ring shape.

[0007] The PET integrated detector ring based on 3D printing technology provides an innovative solution. The 3D printed detector ring can achieve accurate prefabrication, thereby reducing or eliminating the need for later fine-tuning correction. This integrated design uses the structure of the detector ring to accurately install the detectors to the specified position, forming a high-precision circular arrangement, and can better control the gap between the detectors to avoid contact between them. In addition, 3D printing technology can also improve the manufacturing speed, reduce the cost, and possibly achieve higher installation accuracy and reliability. This technology is more important for high spatial resolution devices (more sensitive to installation accuracy).

[0008] To solve the above technical problems, the present application provides the following technical solutions:

[0009] A PET integrated detector ring based on 3D printing technology, characterized in that it comprises a 3D printed detector ring, a detector and a detector fixing device.

[0010] The detector ring comprises a plurality of side walls, each of which is provided with a mounting position of the detector and a detector fixing hole for embedding and fixing the detector; the mounting position is parallel to the axial direction of the detector ring; and the center of the detector ring serves as a scanning channel.

[0011] The detector fixing device is used to connect and fix the circuit board of the detector.

[0012] Further, the mounting position is a mounting groove 6, the opening of which is located on the outer surface of each side wall of the detector ring, for inserting the detector, and the surface inside the mounting groove 6 is in contact with the positioning surface of the scintillation crystal of the detector; the mounting groove 6 is provided with a detector fixing hole 9 on the side wall of the detector ring, for fixing the inserted detector.

[0013] Further, the detector fixing device comprises a fixing member and a fastener, the fixing member is customized according to the circuit board of the detector, the fixing member is a buckle type structure matched with the fastener, and the fixing member is used to connect and fix the circuit board of the inserted detector.

[0014] Further, the clamp comprises two 3D printed customized plastic fixing pieces 10, and the fixing member is a metal fixing plate 17; the two plastic fixing pieces 10 are symmetrically combined to form a buckle; and the buckle is connected to the corresponding hole position of the metal fixing plate 17 through a screw 19.

[0015] Further, both ends of the detector ring are provided with a detector ring fixing hole 8 for fixing the detector ring, and both ends of the metal fixing plate 17 are provided with a first fixing hole; one metal mounting plate 16 is arranged at each end of the detector ring, a plurality of threaded holes matched with the first fixing hole are arranged on the side wall edge corresponding to the end face of the detector ring on the metal mounting plate 16, a plurality of first through holes matched with the detector ring fixing hole 8 are arranged in the middle of the metal mounting plate 16, and a second through hole for connecting both ends of the detector ring is arranged; the metal fixing plate 17 is connected to the threaded hole through the first fixing hole and the screw 18, so as to realize the connection between the metal fixing plate 17 and the metal mounting plate 16; and the detector ring is connected to the second through hole through the second bolt 20 and the metal mounting plate 16, so as to realize the connection between the detector ring and the metal mounting plate 16.

[0016] Further, the detector fixing hole 9 is an internally threaded hole, and the metal fixing plate 17 is provided with a hole matched with the internally threaded hole; a screw is passed through the hole and connected with the internally threaded hole to fix the embedded detector in the mounting groove 6.

[0017] Further, the detector fixing device comprises a fixing member, the fixing member comprises two 3D printing customized plastic fixing plates 10, and the two plastic fixing plates 10 are symmetrically combined to form a buckle for connecting and fixing the inserted circuit board of the detector.

[0018] Further, the bottom of the mounting groove 6 is provided with a through hole 7 for reducing the scattering of gamma photons before reaching the detector.

[0019] Further, the detector ring is a ring structure formed by a plurality of side walls.

[0020] The application provides a PET integrated detector ring based on 3D printing technology, which comprises a detector ring, a detector and a detector fixing device.

[0021] The detector ring is provided with a scanning channel, a detector mounting position and a fixing hole position, the scanning channel is located at the center of the detector ring, the detector mounting position is arranged on each side surface of the detector ring and is parallel to the axial direction of the detector ring, and each side surface of the detector ring is used for mounting a detector; and the fixing hole position comprises a detector fixing hole position and a detector ring fixing hole position.

[0022] The detector is composed of application specific integrated circuit readout electronics (ASIC), silicon photomultiplier (SiPM), light guide and crystal array;

[0023] The detector fixing device is arranged on each side surface of the detector ring and the surface of the circuit board of the detector and is connected and fixed in the form of a bolt or a buckle.

[0024] Preferably, the detector ring is provided as a hollow ring structure.

[0025] Preferably, the scanning channel is arranged in a hollow part in the detector ring, and each side surface constituting the hollow part is arranged in the form of a through hole.

[0026] Preferably, the size of the hollow part is determined according to the PET system.

[0027] Preferably, the position of each side surface corresponds to the mounting position of the detector.

[0028] Preferably, the through hole is arranged on each side surface in the mounting position bottom surface of the detector and the scanning channel.

[0029] Preferably, the shape and size of the through hole are determined according to the shape and size of the crystal array in the detector, and the shape and size of the through hole should be smaller than that of the crystal array;

[0030] Preferably, the mounting position of the detector is arranged on each outer surface of the detector ring, and the mounting position of the detector is in contact with the side surface of the scintillation crystal of the detector when the detector is mounted;

[0031] Preferably, the shape and size of the mounting position are determined according to the shape and size of the crystal array of the detector, and the shape and size of the mounting position should be slightly larger than that of the crystal array;

[0032] Preferably, the fixing hole of the detector is arranged at least four, which is arranged on the two side surfaces of the mounting position and the symmetrical position of each side surface of the detector ring;

[0033] Preferably, the fixing hole of the detector ring is arranged on the front and rear end surfaces of the detector ring, and is uniformly distributed;

[0034] Preferably, the fixing device of the detector is determined according to the shape and size of the detector, and the detector is fixed on the detector ring by bolt connection or buckle form.

[0035] Compared with the prior art, the positive effects of the present application are:

[0036] 1. Precise prefabricated design: with the help of 3D printing technology, the integrated detector ring can be produced with high precision according to the digital model, which ensures that the size and position of each component meet the design requirements and reduces the deviation in the manufacturing process.

[0037] 2. Fast installation process: since the 3D printed parts have reserved accurate mounting holes and fixing points, the detector module can be quickly assembled on the detector ring, greatly shortening the entire installation period.

[0038] 3. No need for later fine tuning: traditional methods may need complex adjustment and calibration steps after installation to ensure the correct alignment of the detector. The integrated detector ring design of the present application avoids these time-consuming post-adjustment work through precise manufacturing process.

[0039] 4. Structural stability: the integrated structure of 3D printing ensures the stability and firmness of the entire detector ring, thereby reducing the deformation or misplacement caused by mechanical stress or environmental factors.

[0040] 5. Cost-effectiveness: Although the initial investment in 3D printing equipment is relatively high, the integrated design of the detector ring can reduce material waste, reduce labor costs, and shorten the production cycle, which may have better cost-effectiveness ratio in the long run. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 The overall structure diagram of the detector ring of the first embodiment of the present application.

[0042] Figure 2 The schematic diagram of the detector of the first embodiment of the present application.

[0043] Figure 3 The cross-sectional view of the internal structure of the detector ring of the first embodiment of the present application.

[0044] Figure 4 The cross-sectional view of the detector in the detector ring.

[0045] Figure 5 The overall structure diagram of the detector ring of the second embodiment of the present application.

[0046] Figure 6 The schematic diagram of the detector of the second embodiment of the present application.

[0047] Figure 7 The cross-sectional view of the internal structure of the detector ring of the second embodiment of the present application.

[0048] Figure 8 The cross-sectional view of the detector in the detector ring of the second embodiment of the present application.

[0049] Reference signs: 1 - detector ring; 2 - detector; 3 - scanning channel; 4 - first bolt; 5 - fixing device of detector; 6 - mounting groove of detector; 7 - through hole; 8 - detector ring fixing hole; 9 - detector fixing hole; 10 - plastic fixing sheet; 11 - readout electronics of application specific integrated circuit (ASIC); 12 - silicon photomultiplier (SiPM); 13 - LYSO crystal array; 14 - BGO crystal array; 15 - light guide; 16 - metal mounting plate; 17 - metal fixing plate; 18 - M3 screw; 19 - M2 screw; 20 - second bolt. DETAILED DESCRIPTION

[0050] The present application will be further described in detail below with reference to the accompanying drawings, wherein the same numerals represent the same or similar elements in different drawings. The examples are only used to explain the present application and are not intended to limit the scope of the present application.

[0051] Embodiment I: The present embodiment provides a PET integrated detector ring based on 3D printing technology, as shown in Figures 1-4, for positioning when the detector is installed in a ring structure, comprising a detector ring 1, a detector 2 and a detector fixing device 5. The detector ring 1 is a decagon ring structure, which is made of 3D printing technology and the material is light-cured resin. The detector ring 1 is provided with a scanning channel 3 and a detector mounting groove 6; the scanning channel 3 is arranged along the central axis of the detector ring 1, the scanning channel 3 is the hollow part of the detector ring 1, which is also a decagon; a through hole 7 is arranged on each side of the scanning channel 3, which can reduce the influence of the material thickness on the detection efficiency of the detector. The detector mounting groove 6 is arranged on each side surface of the detector ring 1, and each side surface of the detector mounting groove 6 is used for the installation and positioning of the detector 2. The side surface of the detector mounting groove 6 is designed with a detector fixing hole 9, and the holes are symmetrically distributed on the two side surfaces of the mounting position. The core components of the detector 2 include application-specific integrated circuit readout electronics (ASIC) 11, silicon photomultiplier (SiPM) 12, light guide 15 and crystal array. Specifically, the readout electronics is composed of two transverse circuit boards and two vertical circuit boards, as shown in Figure 4 、 Figure 8 , the bottom surface of the transverse circuit board is provided with a special socket, and the socket is accurately matched with the pin of the silicon photomultiplier 12; the crystal array of the detector 2 is divided into two layers, which are the top layer LYSO crystal array 13 and the bottom layer BGO crystal array 14 (in the design of the detector, LYSO crystal array and BGO crystal array each have its specific function and advantage. LYSO crystal is used for the top layer because of its excellent spatial resolution and light output, while BGO crystal is used for the bottom layer because of its high density and high blocking capacity). In addition, the light guide 15 of the detector 2 is located between the BGO crystal array 14 and the silicon photomultiplier (SiPM) 12. Adjacent crystal arrays of the detector 2 do not contact each other and there is a small gap (in the precise detector design, the arrangement of the crystal array and the distance between them need to be carefully designed, which will affect the performance of the system imaging). When installing the detector 2, two detectors in a group are placed side by side along the long edge direction and put into the detector mounting groove 6 of the detector ring 1 in the axial direction. The detector fixing device 5 is designed as two symmetrical plastic fixing sheets 10, and the buckle design on the plastic fixing sheet 10 is used to fix the detector 2, Figure 1 , where a is a partial enlarged view of the plastic fixing sheet buckle fixing the circuit board, it can be seen that the gap between the crystal array included angle is small, and the crystal array is uniformly arranged in the detector ring, which reflects the high integrity and accurate positioning ability of the 3D printed integrated detector ring; Figure 3The b in the figure is a local enlarged view of the relationship between the adjacent detector crystal arrays, and it can be seen that not only the crystals themselves are accurately positioned, but also the circuit boards have positioning limits, further ensuring the stability and integration of the entire detector ring. During installation, the two vertical circuit boards of the two detectors 2 inserted into the detector ring 1 are clamped by buckles, the bottom is placed on the horizontal circuit board of the detector 2, and the detector 2 is fixed on the detector ring 1 by the M2.5 first bolt 4. The rear end face of the detector ring 1 is provided with a detector ring fixing hole 8, which is used to realize the stable installation of the entire detector ring on the PET system structure. The present embodiment is applied to the third generation high-performance small animal PET system prototype machine developed by the team, and the first bolt 4 is an M2.5 bolt.

[0052] Example two: on the basis of example one, the detector ring is optimized as a whole to improve the performance and reliability of the system, refer to Figures 5-8 ; Figure 7C is a local enlarged view of the relationship between the crystal arrays of adjacent detectors, d is a local enlarged view of the plastic fixing piece clamping the circuit board, which reflects the high integrity, accurate positioning ability and stability of the 3D printed integrated detector ring. First, we combined the integrity of 3D printing materials and the strength of machined metal materials to optimize the overall structure of the detector ring. By using 3D printing technology, we can manufacture complex detector ring structures to meet the needs of high precision and high resolution. At the same time, by using the high strength characteristics of machined metal materials, we can ensure the stability and durability of the detector ring. Including detector ring 1, detector 2 and detector fixing device 5. The main body of the detector ring 1 in this embodiment is made of the same 3D printing light-cured resin material as in example one; the shape of the detector ring 1 is the same as in example one, both of which are ten-sided ring structures. The detector ring 1 is provided with a scanning channel 3 and a detector mounting groove 6, wherein the scanning channel 3 is the same as in example one, and the size of the detector mounting groove 6 is adjusted according to the detector 2. Each side surface in the scanning channel 3 is also provided with a through hole 7, and the shape and size of the through hole 7 are adjusted according to the shape and size of the crystal array of the detector 2; the readout electronics (ASIC) 11 of the special integrated circuit of the detector 2, the silicon photomultiplier (SiPM) 12 are consistent with example one, the difference is in the light guide 15 and the crystal array, the crystal array of the detector 2 is designed as a four-layer structure, the top layer of crystal array is LYSO crystal array 13, the second layer of crystal array is BGO crystal array 14, the third layer of crystal array is LYSO crystal array 13, and the bottom layer of crystal array is BGO crystal array 14, LYSO crystal array 13 and BGO crystal array 14 are distributed in layers, combining the advantages of the two kinds of crystals, which not only improves the detection efficiency of high-energy rays, but also maintains good spatial resolution and energy resolution; in addition, the light guide 15 of the detector 2 is located between the BGO crystal array 14 and the silicon photomultiplier (SiPM) 12; the crystal array in example two adopts a four-layer laminated structure composed of LYSO and BGO crystals, and the light guide is located at the bottom of the entire structure, close to the silicon photomultiplier (SiPM); specifically, the bottom surface of the light guide is coupled to the BGO array below through a layer of silicone grease, while the top surface is coupled to the side of the SiPM without pins through another layer of silicone grease; such a design cleverly utilizes the position of the light guide to improve the distribution of light signals, making the light signals more uniformly transmitted to the SiPM; the use of silicone grease reduces the loss of light signals during transmission and improves the capture efficiency of light signals, this optimized light signal transmission method significantly improves the signal-to-noise ratio (SNR), thereby improving the overall performance of the detector, especially in terms of high resolution and low background noise.The adjacent detector 2 crystal arrays are not in contact with each other and have a small gap, as in the first embodiment; the fixing device 5 of the detector includes a 3D printed plastic fixing sheet 10 and a metal fixing plate 17 made of metal material; the plastic fixing sheet 10 is composed of two symmetrical parts and is designed with buckles, the position and size of which are accurately calculated to cooperate with the transverse circuit board of the detector 2; during installation, first, the transverse circuit board of the detector 2 is inserted into the buckle of the plastic fixing sheet 10, and the buckle is connected to the corresponding hole position of the metal fixing plate 17 by M2 screws 19 to achieve preliminary positioning. Then, the metal fixing plate 17 is aligned with the corresponding hole position on the metal mounting plate 16, and M3 screws 18 are used to pass through these hole positions to tightly connect the detector 2 and the detector ring 1 together. The front and rear ends of the detector ring 1 are connected to two metal mounting plates 16 through second bolts 20, which are M4 bolts. These metal mounting plates 16 not only provide additional structural strength, but also provide a basis for the fixed installation of the detector 2; the metal mounting plate is provided with a detector fixing hole 9 and a detector ring fixing hole 8, the detector fixing hole 9 is an M3 internal thread hole, the detector 2 is installed by connecting the metal fixing plate 17 through the M3 screw 18, the M3 screw 18 passes through the hole of the metal fixing plate 17 and the plastic fixing sheet 10, and finally is screwed into the screw hole previously left on the metal mounting plate 16, so that the detector is firmly fixed on the detector ring; the M3 screw 18 not only connects the metal fixing plate 17 and the plastic fixing sheet 10, but also ensures the stable connection between the detector and the mounting ring. The detector ring fixing hole 8 is an M6 internal thread hole, which is installed on the PET system structure through the detector ring fixing hole 8; this embodiment is applied to the fourth generation of ultra-high performance small animal PET system developed by the team.

[0053] The 3D printed detector ring of the present application is subjected to accurate multidimensional testing, and its dimensional accuracy far exceeds the ±0.2mm standard of conventional 3D printers. Through repeated experiments, the optimal size parameters and the structure design combined with specific crystal arrays and selected electronic modules are determined, achieving excellent assembly completion, and the present application also innovatively integrates a water cooling module for efficient cooling of the chip; these innovative designs ensure high assembly quality and imaging performance of the detector ring, meeting or exceeding the technical standards of the expected equipment.

[0054] Although specific embodiments of the present application are disclosed for illustrative purposes, the purpose is to help understand the content of the present application and to implement it, those skilled in the art can understand that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present application and the appended claims. Therefore, the present application should not be limited to the disclosed content of the best embodiment, and the scope of protection claimed by the present application is defined by the scope of the claims.

Claims

1. A PET integrated detector ring based on 3D printing technology, characterized in that, This includes 3D-printed detector rings, detectors, and detector mounting devices; The detector ring includes multiple sidewalls, each of which has a detector mounting position and a detector fixing hole for embedding and fixing the detector; the mounting position is parallel to the axis of the detector ring; the center of the detector ring serves as a scanning channel; The detector fixing device is used to connect and fix the circuit board of the detector, and is connected and fixed to the detector ring; The installation position is a mounting slot (6), the opening of the mounting slot (6) is located on the outer surface of each side wall of the detector ring, for inserting the detector, and the surface inside the mounting slot (6) is in contact with the positioning surface of the scintillation crystal of the detector; the mounting slot (6) is provided with a detector fixing hole (9) on the side wall of the detector ring for fixing the inserted detector. The fixing device for the detector includes a fixing component and a fastener. The fixing component is customized according to the circuit board of the detector. The fixing component has a snap-on structure. The fixing component and the fastener cooperate to connect and fix the circuit board of the inserted detector. The fasteners include two 3D-printed custom plastic fasteners (10) and a metal fastener (17), and the fasteners are screws (19); the two plastic fasteners (10) are symmetrically combined to form a buckle; the buckle is connected to the corresponding hole of the metal fastener (17) by the screws (19).

2. The PET integrated detector ring according to claim 1, characterized in that, The detector ring has detector ring fixing holes (8) at both ends for fixing the detector ring, and the metal fixing plate (17) has first fixing holes at both ends; a metal mounting plate (16) is provided at each end of the detector ring, and the metal mounting plate (16) has multiple threaded holes on the side wall edge corresponding to the end face of the detector ring, multiple first through holes in the middle that match the detector ring fixing holes (8), and a second through hole for connecting the two ends of the detector ring; the metal fixing plate (17) is connected to the threaded hole by passing through the first fixing hole with a first screw (18), thereby realizing the connection between the metal fixing plate (17) and the metal mounting plate (16); the detector ring is connected to the second through hole by passing through the metal mounting plate (16) with a second bolt (20), thereby realizing the connection between the detector ring and the metal mounting plate (16).

3. The PET integrated detector ring according to claim 1, characterized in that, The detector fixing hole (9) is an internal threaded hole, and the metal fixing plate (17) is provided with a hole that matches the internal threaded hole; the detector is fixedly embedded in the mounting groove (6) by passing a screw through the hole and connecting it to the internal threaded hole.

4. The PET integrated detector ring according to claim 1, characterized in that, The bottom of the mounting slot (6) is provided with a through hole (7) to reduce the scattering of gamma photons before they reach the detector.

5. The PET integrated detector ring according to claim 1, characterized in that, The detector ring is a ring structure composed of multiple sidewalls.

6. A PET integrated detector ring based on 3D printing technology, characterized in that, This includes 3D-printed detector rings, detectors, and detector mounting devices; The detector ring includes multiple sidewalls, each of which has a detector mounting position and a detector fixing hole for embedding and fixing the detector; the mounting position is parallel to the axis of the detector ring; the center of the detector ring serves as a scanning channel; The detector fixing device is used to connect and fix the circuit board of the detector, and is connected and fixed to the detector ring; The installation position is a mounting slot (6), the opening of the mounting slot (6) is located on the outer surface of each side wall of the detector ring, for inserting the detector, and the surface inside the mounting slot (6) is in contact with the positioning surface of the scintillation crystal of the detector; the mounting slot (6) is provided with a detector fixing hole (9) on the side wall of the detector ring for fixing the inserted detector. The fixing device of the detector includes a fixing component, which includes two 3D printed custom plastic fixing pieces (10). The two plastic fixing pieces (10) are symmetrically combined to form a buckle for connecting and fixing the circuit board of the inserted detector. The buckle is connected to the detector ring by a first bolt (4).

7. The PET integrated detector ring according to claim 6, characterized in that, The bottom of the mounting slot (6) is provided with a through hole (7) to reduce the scattering of gamma photons before they reach the detector.

8. The PET integrated detector ring according to claim 6, characterized in that, The detector ring is a ring structure composed of multiple sidewalls.

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