A polyhedral brain PET detector with adjustable function

Abstract

This invention discloses a polyhedral brain PET detector with adjustment function, belonging to the field of medical testing equipment technology. It includes an external support structure, a detection structure, semi-annular pads, and an adjustment module. The detection structure is installed within the external support structure. The detection structure includes a top mounting plate, detection module one, detection module two, detection module three, and a structural assembly frame. Multiple sets of detection modules one, two, and three are installed between the top mounting plate and the structural assembly frame. The top mounting plate, structural assembly frame, detection modules one, two, and three are distributed in a large rhomboid semi-cube shape. Two semi-annular pads are symmetrically installed on the lower side of the external support structure, forming a neck limiter between them. An adjustment structure is installed on the upper side of the external support structure. Through this method, while allowing for a certain degree of deformation adjustment and improving the user's head geometric fit, the peripheral field of vision is effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of medical testing equipment technology, specifically to a polyhedral brain PET detector with adjustment function. Background Technology

[0002] Positron emission tomography (PET) is a non-invasive molecular imaging technique that can quantitatively and dynamically reflect the metabolic activities of tissues in vivo at the molecular level. Therefore, it can detect abnormal activities before changes in tissue morphology and structure occur, and has unique value in the early prevention and diagnosis of major diseases such as cardiovascular diseases, tumors, and neurological diseases. It is currently widely used in the fields of early disease diagnosis and new drug development.

[0003] For example, Chinese patent CN221577770U discloses a brain PET device, which includes: a detection ring connected to the backrest and located above the backrest; a push-pull assembly that pulls the backrest to make it rotate around its first rotational connection position with the support, and the rotating backrest, through a linkage assembly, makes the seat rotate around its second rotational connection position with the support and the third rotational connection position of the leg rest with the backrest in the same direction.

[0004] However, existing brain PET devices, especially the common circular PET devices, have poor geometric compatibility with the human brain. Their axial distance range covers a small solid angle, resulting in low efficiency in recording useful information. Consequently, their detection time is long, detection efficiency is low, image quality is poor, and spatial resolution is low. Furthermore, helmet-mounted PET devices have limited axial field of view. Structures near the hemisphere edge, such as the upper part of the skull and the lower part of the cerebellum, are in the detector's "axial peripheral field of view," with a solid angle coverage lower than that of the central brain region. This leads to decreased detection sensitivity in these areas, making them prone to missed diagnoses or blurred boundaries.

[0005] Based on this, the present invention designs a polyhedral brain PET detector with adjustment function to solve the above problems. Summary of the Invention

[0006] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a polyhedral brain PET detector with adjustment function.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A polyhedral brain PET detector with adjustment function includes an external support structure, a detection structure, a semi-annular pad, and an adjustment structure;

[0009] The detection structure is installed inside the external support structure;

[0010] The detection structure includes a top mounting plate, detection module one, detection module two, detection module three, and a structural assembly frame. Multiple sets of detection modules one, two, and three are installed between the top mounting plate and the structural assembly frame. The top mounting plate and the structural assembly frame are regular octagons. There are twelve detection modules one, which are regular quadrilaterals; eight detection modules two, which are regular hexagons; and four detection modules three, which are regular octagons. The top mounting plate, the structural assembly frame, detection modules one, two, and three are arranged in a large rhombic semi-cube distribution.

[0011] The top mounting plate is rotatably connected to the adjacent detection module one and detection module two; the structural assembly frame is rotatably connected to the adjacent detection module one and detection module two; detection module three is rotatably connected to the adjacent detection module one.

[0012] Two semi-circular pads are symmetrically installed on the lower side of the external support structure, and the two semi-circular pads form a human neck limiter.

[0013] An adjustment structure for adjusting the overall height of the structure is installed on the upper side of the external support structure.

[0014] Furthermore, the external support structure includes an installation structure and an internal support structure, with multiple sets of internal support structures installed within the installation structure to support detection module one, detection module two, and detection module three.

[0015] Furthermore, the external support structure also includes springs. The four upper springs are evenly distributed at equal intervals within the mounting structure. One end of each spring is connected to the mounting structure, and the other end is fixedly connected to the four upper detection modules. The two lower springs are symmetrically distributed, with one end of each spring fixedly connected to the structural assembly frame and the other end connected to the mounting structure.

[0016] Furthermore, the mounting structure includes a mounting ring rod and a zigzag connecting rod, with the upper spring fixedly connected to the mounting ring rod; multiple zigzag connecting rods are evenly distributed in a circumferential array at equal intervals, and the zigzag connecting rods are fixedly connected to the mounting ring rod; the zigzag connecting rods are made of elastic metal rods.

[0017] Furthermore, an internal support structure is installed on the zigzag connecting rod, and the internal support structure is connected to detection module two, detection module three and detection module one.

[0018] Furthermore, the mounting structure also includes a lower mounting ring and a mounting rod. The lower mounting ring is fixedly mounted on the lower side of the zigzag connecting rod. Mounting rods are symmetrically fixedly mounted on the lower mounting ring, and the inner end of the mounting rod is fixedly connected to the semi-annular pad. The spring below is fixedly connected to the lower mounting ring.

[0019] Furthermore, the internal support structure includes support rod one, an arc-shaped rod, and support rod two. Support rod one is fixedly installed on the broken line connecting rod, and an arc-shaped rod is fixedly installed on the inner end of support rod one. One end of support rod two is fixedly connected to the arc-shaped rod, and the other end of support rod two is fixedly connected to detection module one, detection module two, and detection module three, respectively.

[0020] Furthermore, the adjustment structure includes a fixed ring and electric telescopic rods. Multiple electric telescopic rods are uniformly fixedly installed in a circular array under the fixed ring, and the output end of the electric telescopic rods is fixedly connected to the mounting ring rod.

[0021] Furthermore, a limiting wedge is fixedly installed on the inside of the top mounting plate and the structural assembly frame to limit the rotation angle of adjacent detection module one and detection module two.

[0022] Furthermore, each of the detection modules 1, 2, and 3 is equipped with a scintillation crystal for generating visible light pulses when struck by gamma photons and a photoelectric converter for converting the light pulses into electrical signals.

[0023] Compared to existing technologies, the advantages of this invention are as follows: The combination of detection module one, detection module two, and detection module three allows for a geometric fit with the human head. Compared to traditional cylindrical detectors, traditional detectors have the highest solid angle coverage in the central region, while the brain's peripheral region is within the detector's "peripheral field of view," resulting in a significant decrease in solid angle coverage and a large angle between the photon incident direction and the detector's normal, severely reducing sensitivity. Similarly, helmet-mounted and hemispherical detectors also suffer from a large angle between the photon incident direction and the detector's normal originating from the brain's edge, leading to low sensitivity in detecting lesions at the brain's periphery. Furthermore, determining an event requires the simultaneous detection of a pair of photons moving in opposite directions, while helmet-mounted and hemispherical detectors have inherent limitations in their axial (top-base direction) coverage, resulting in an axial peripheral field of view, making it impossible to accurately and sensitively detect lesions in this region. For photons emitted from the brain's peripheral region, the incident angle is smaller than the angle of impact with the circumscribed circle's normal under the same geometric conditions, effectively reducing the peripheral field of view. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0025] Figure 1This invention relates to a stereoscopic multi-faceted brain PET detector with adjustment function. Figure 1 ;

[0026] Figure 2 This is a front view of a polyhedral brain PET detector with adjustment function according to the present invention;

[0027] Figure 3 This invention relates to a stereoscopic multi-faceted brain PET detector with adjustment function. Figure 2 ;

[0028] Figure 4 This invention relates to a stereoscopic multi-faceted brain PET detector with adjustment function. Figure 3 .

[0029] The labels in the diagram represent:

[0030] 1. External support structure; 11. Installation structure; 111. Mounting ring rod; 115. Folded line connecting rod; 116. Lower mounting ring; 117. Mounting rod; 12. Spring; 13. Internal support structure; 131. Support rod one; 132. Arc rod; 133. Support rod two; 2. Detection structure; 21. Top mounting plate; 22. Detection module one; 23. Detection module two; 24. Detection module three; 25. Structural assembly frame; 3. Semi-circular pad; 4. Adjustment structure; 41. Fixing ring; 42. Electric telescopic rod. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] The terms "left," "right," "front," "back," "up," and "down" used in the following description refer to the orientation from the perspective of the front view.

[0033] Example 1: In some embodiments, please refer to the accompanying drawings. Figures 1-4 A polyhedral brain PET detector with adjustment function includes an external support structure 1, a detection structure 2, a semi-annular pad 3, and an adjustment structure 4.

[0034] The detection structure 2 is installed inside the outer support structure 1;

[0035] like Figure 3 and Figure 4As shown, the detection structure 2 includes a top mounting plate 21, detection module one 22, detection module two 23, detection module three 24, and a structural assembly frame 25. Multiple sets of detection modules one 22, detection module two 23, and detection module three 24 are installed between the top mounting plate 21 and the structural assembly frame 25. The top mounting plate 21 and the structural assembly frame 25 are regular octagons. There are twelve detection modules one 22, which are regular quadrilaterals; eight detection modules two 23, which are regular hexagons; and four detection modules three 24, which are regular octagons. The top mounting plate 21, the structural assembly frame 25, the detection modules one 22, the detection modules two 23, and the detection modules three 24 are distributed in a large rhombic semi-cube shape.

[0036] The top mounting plate 21 is rotatably connected to the adjacent detection module 1 22 and detection module 23; the structural assembly frame 25 is rotatably connected to the adjacent detection module 1 22 and detection module 23; and the detection module 3 24 is rotatably connected to the adjacent detection module 1 22.

[0037] Two semi-circular pads 3 are symmetrically installed on the lower side of the external support structure 1, and the two semi-circular pads 3 together form a human neck limiter.

[0038] An adjustment structure 4 for adjusting the overall height of the structure is installed on the upper side of the external support structure 1.

[0039] like Figure 2 As shown, the outer support structure 1 includes an installation structure 11 and an inner support structure 13. The installation structure 11 has multiple sets of inner support structures 13 for supporting the first detection module 22, the second detection module 23 and the third detection module 24.

[0040] The external support structure 1 also includes springs 12. The four upper springs 12 are evenly distributed at equal intervals within the mounting structure 11. One end of the spring 12 is connected to the mounting structure 11, and the other end of the spring 12 is fixedly connected to the four upper detection modules 22 respectively. The two lower springs 12 are symmetrically distributed. One end of the spring 12 is fixedly connected to the structural assembly frame 25, and the other end of the spring 12 is connected to the mounting structure 11.

[0041] In this embodiment, when the adjustable polyhedral brain PET detector is working normally and not in use, the spring 12 is stretched, and the mounting structure 11 supports the top mounting plate 21, the first detection module 22, the second detection module 23, the third detection module 24 and the structural assembly frame 25 through the inner support structure 13, so that the whole structure is distributed in a large rhomboid half cube shape; the height of the whole structure can be adjusted by operating the adjustment structure 4.

[0042] After the user is injected with the tracer required for brain PET, the tracer enters the brain through blood circulation and accumulates in metabolically active tissue areas, where the number of negative electrons is relatively high.

[0043] When the nuclide in the tracer decays, it releases a positron. The positron annihilates with the negative electrons in the brain tissue, and the mass of the two electrons is completely converted into energy, generating a pair of gamma photons moving in opposite directions. The pair of gamma photons travel in opposite directions along a straight line until they collide with detector modules 1 (22), 23, and 3 (24). The scintillation crystals and photoelectric conversion devices on detector modules 1 (22), 23, and 3 (24) convert the gamma photons into electrical signals. When a pair of gamma photons collide with two opposite detector modules in the array within a certain system time window, the system determines it as a coincidence event. The line connecting the two response positions is a line of response (LOR). The brain can be imaged based on the LOR lines of multiple coincidence events.

[0044] Simultaneously, the configuration of detection modules 1 (22), 23, and 3 (24) ensures a geometric fit with the human head. Compared to traditional cylindrical detectors, traditional detectors have the highest solid angle coverage in the central region, while the brain's peripheral region is in the detector's "peripheral field of view," resulting in a significant decrease in solid angle coverage and a large angle between the photon incident direction and the detector's normal, severely reducing sensitivity. Similarly, helmet-mounted and hemispherical detectors also suffer from the problem of a large angle between the photon incident direction and the detector's normal originating from the brain's edge, leading to low sensitivity in detecting lesions at the brain's periphery. Furthermore, determining an event requires the simultaneous detection of a pair of photons moving in opposite directions, while helmet-mounted and hemispherical detectors have inherent limitations in their coverage along the axial top-to-base direction, resulting in an axial peripheral field of view that cannot accurately and sensitively detect lesions in this area.

[0045] This application, through its overall configuration that adapts to the geometry of the human head, ensures that the impact angle of photons emitted from the peripheral region of the brain is smaller than the impact angle of the normal to the circumscribed circle under the same geometric conditions, thus effectively reducing the peripheral field of vision.

[0046] Example 2: In some embodiments, as a preferred embodiment of the present invention, such as... Figure 3 and Figure 4 As shown, the mounting structure 11 includes a mounting ring rod 111 and a zigzag connecting rod 115. The upper spring 12 is fixedly connected to the mounting ring rod 111. Multiple zigzag connecting rods 115 are evenly distributed in a circumferential array at equal intervals. The zigzag connecting rods 115 are fixedly connected to the mounting ring rod 111. The zigzag connecting rods 115 are made of elastic metal rods.

[0047] An inner support structure 13 is installed on the zigzag connecting rod 115. The inner support structure 13 is connected to the second detection module 23, the third detection module 24 and the first detection module 22.

[0048] The mounting structure 11 also includes a lower mounting ring 116 and a mounting rod 117. The lower mounting ring 116 is fixedly mounted on the lower side of the zigzag connecting rod 115. The mounting rod 117 is symmetrically fixedly mounted on the lower mounting ring 116. The inner end of the mounting rod 117 is fixedly connected to the semi-annular pad 3. The lower spring 12 is fixedly connected to the lower mounting ring 116.

[0049] The inner support structure 13 includes a first support rod 131, an arc-shaped rod 132, and a second support rod 133. The first support rod 131 is fixedly installed on the broken line connecting rod 115. The arc-shaped rod 132 is fixedly installed at the inner end of the first support rod 131. One end of the second support rod 133 is fixedly connected to the arc-shaped rod 132. The other ends of the second support rods 133 are fixedly connected to the first detection module 22, the second detection module 23, and the third detection module 24, respectively.

[0050] like Figure 2 As shown, the adjustment structure 4 includes a fixed ring 41 and an electric telescopic rod 42. Multiple electric telescopic rods 42 are uniformly fixedly installed in a circular array below the fixed ring 41. The output end of the electric telescopic rod 42 is fixedly connected to the mounting ring rod 111.

[0051] When in use, the electric telescopic rod 42 drives the mounting ring rod 111 to lift, thereby adjusting the overall height; when in use, it can be adjusted according to the height of the user.

[0052] The top mounting plate 21 and the inner side of the structural assembly frame 25 are fixedly installed with limiting wedges to restrict the rotation angle of adjacent detection module 1 22 and detection module 23.

[0053] The detection module 1 22, detection module 23 and detection module 3 24 have the same structure. Detection module 1 22 includes a hollow mounting plate, a scintillation crystal and a photoelectric converter. The hollow mounting plate is fixedly installed with a scintillation crystal for generating visible light pulses when γ photons collide and a photoelectric converter for converting light pulses into electrical signals.

[0054] The scintillation crystal is an LYSO crystal with specific dimensions of 4mm×4mm×20mm and a crystal gap of 0.15mm.

[0055] The photoelectric converter uses a SiPM photoelectric sensor.

[0056] The side length of the top mounting plate 21, detection module one 22, detection module two 23, detection module three 24, and structural combination frame 25 is designed to be 72mm to meet the needs of actual detection objects.

[0057] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A polyhedral brain PET detector with adjustment function, comprising an external support structure (1), a detection structure (2), a semi-annular pad (3), and an adjustment structure (4), characterized in that: The detection structure (2) is installed inside the external support structure (1); The detection structure (2) includes a top mounting plate (21), a first detection module (22), a second detection module (23), a third detection module (24), and a structural assembly frame (25). Multiple sets of first detection modules (22), second detection modules (23), and third detection modules (24) are installed between the top mounting plate (21) and the structural assembly frame (25). The top mounting plate (21) and the structural assembly frame (25) are regular octagons. There are twelve first detection modules (22), which are square quadrilaterals. There are eight second detection modules (23), which are regular hexagons. There are four third detection modules (24), which are regular octagons. The top mounting plate (21), the structural assembly frame (25), the first detection module (22), the second detection module (23), and the third detection module (24) are distributed in a large rhomboid half-cube shape. The top mounting plate (21) is rotatably connected to the adjacent detection module 1 (22) and detection module 2 (23); the structural assembly frame (25) is rotatably connected to the adjacent detection module 1 (22) and detection module 2 (23); the detection module 3 (24) is rotatably connected to the adjacent detection module 1 (22); Two semi-circular pads (3) are symmetrically installed on the lower side of the external support structure (1), and the two semi-circular pads (3) form a human neck limiter; The upper side of the external support structure (1) is equipped with an adjustment structure (4) for adjusting the overall height of the structure. The external support structure (1) includes an installation structure (11) and an internal support structure (13). The installation structure (11) has multiple sets of internal support structures (13) for supporting the first detection module (22), the second detection module (23) and the third detection module (24). The external support structure (1) also includes springs (12). The four upper springs (12) are evenly distributed at equal intervals within the mounting structure (11). One end of each spring (12) is connected to the mounting structure (11), and the other end of each spring (12) is fixedly connected to the four upper detection modules (22). The two lower springs (12) are symmetrically distributed. One end of each spring (12) is fixedly connected to the structural assembly frame (25), and the other end of each spring (12) is connected to the mounting structure (11). The inner support structure (13) includes a support rod one (131), an arc rod (132) and a support rod two (133). The support rod one (131) is fixedly installed on the broken line connecting rod (115). An arc rod (132) is fixedly installed on the inner end of the support rod one (131). One end of the support rod two (133) is fixedly connected to the arc rod (132). The other ends of the different support rods two (133) are fixedly connected to the detection module one (22), the detection module two (23) and the detection module three (24) respectively. The adjustment structure (4) includes a fixed ring (41) and an electric telescopic rod (42). Multiple electric telescopic rods (42) are uniformly fixedly installed in a circular array under the fixed ring (41). The output end of the electric telescopic rod (42) is fixedly connected to the mounting ring rod (111).

2. The polyhedral brain PET detector with adjustment function according to claim 1, characterized in that, The mounting structure (11) includes a mounting ring rod (111) and a zigzag connecting rod (115). The upper spring (12) is fixedly connected to the mounting ring rod (111). Multiple zigzag connecting rods (115) are evenly distributed in a circumferential array. The zigzag connecting rods (115) are fixedly connected to the mounting ring rod (111). The zigzag connecting rods (115) are made of elastic metal rods.

3. The polyhedral brain PET detector with adjustment function according to claim 2, characterized in that, An inner support structure (13) is installed on the zigzag connecting rod (115), and the inner support structure (13) is connected to the second detection module (23), the third detection module (24) and the first detection module (22).

4. The polyhedral brain PET detector with adjustment function according to claim 3, characterized in that, The mounting structure (11) further includes a lower mounting ring (116) and a mounting rod (117). The lower mounting ring (116) is fixedly mounted on the lower side of the zigzag connecting rod (115). The mounting rod (117) is symmetrically fixedly mounted on the lower mounting ring (116). The inner end of the mounting rod (117) is fixedly connected to the semi-annular pad (3). The spring (12) below is fixedly connected to the lower mounting ring (116).

5. The polyhedral brain PET detector with adjustment function according to claim 4, characterized in that, The top mounting plate (21) and the structural assembly frame (25) are fixedly installed with limiting wedges to restrict the rotation angle of adjacent detection module one (22) and detection module two (23).

6. The polyhedral brain PET detector with adjustment function according to claim 5, characterized in that, Each of the detection modules (22), (23), and (24) is equipped with a scintillation crystal for generating visible light pulses when struck by γ-photons and a photoelectric converter for converting the light pulses into electrical signals.

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