CN-115153600-B - Detection module and emission imaging device having the same

CN115153600BCN 115153600 BCN115153600 BCN 115153600BCN-115153600-B

Abstract

The invention provides a detection module and an emission imaging device having the same. The detection module comprises a plurality of detection units arranged in a transverse plane, each detection unit comprises a scintillation crystal array, a light guide layer and a photosensor, wherein the scintillation crystal array, the light guide layer and the photosensor are sequentially arranged along a longitudinal direction perpendicular to the transverse plane, the scintillation crystal array comprises a plurality of scintillation crystals arranged in the transverse plane, the receiving area of the photosensor is smaller than the cross-sectional area of the scintillation crystal array, the light guide layer is provided with a first end face and a second end face which are opposite along the longitudinal direction, the first end face is coupled to the scintillation crystal array, the second end face is coupled to the photosensor, and the area of the first end face is larger than that of the second end face. According to the invention, the light guide layer is of a structure with a large upper part and a small lower part, so that the use amount of the light sensor can be effectively reduced, the cost of the detection module is reduced, the market competitiveness is stronger, and the popularization and application of the emission imaging equipment are more facilitated.

Inventors

XIE SIWEI
ZHANG XI
ZHANG YIBIN
ZHU ZHILIANG

Assignees

湾影科技(深圳)有限公司
深圳湾实验室

Dates

Publication Date: 20260421
Application Date: 20210628
Priority Date: 20210628

Claims (16)

1. A detection module for an emission imaging device, comprising a plurality of detection cells arranged in a transverse plane, each of the plurality of detection cells comprising a scintillation crystal array, a photoconductive layer, and a photosensor sequentially disposed along a longitudinal direction perpendicular to the transverse plane, wherein The scintillation crystal array includes a plurality of scintillation crystals arranged in the transverse plane; the receiving area of the photosensor is smaller than the cross-sectional area of the scintillation crystal array; The photoconductive layer having opposite first and second end faces along the longitudinal direction, the first end face coupled to the array of scintillation crystals and the second end face coupled to the photosensor, the first end face having an area greater than an area of the second end face, and Having a first transverse direction and a second transverse direction perpendicular to each other in the transverse plane, wherein: Along the first lateral direction, each of the plurality of detection units includes one photosensor and two scintillation crystals including a first scintillation crystal and a second scintillation crystal; Along the first and second lateral directions, the photosensor is sized to correspond to a size of a single scintillation crystal; Along the first lateral direction, the two scintillation crystals correspond to the one photosensor such that photosensors of adjacent detection units along the first lateral direction are spaced apart and such that the one photosensor can receive photons from the two scintillation crystals, a number ratio of the scintillation crystals to the photosensors along the second lateral direction is n:1, where n is greater than or equal to 1, and A first light reflecting layer is arranged between the detection units adjacent along the first transverse direction, a first light transmitting window is arranged on the first light reflecting layer so as to allow photons to pass through the first light transmitting window to reach a photosensor coupled by a scintillation crystal array adjacent along the first transverse direction, and the second scintillation crystal is adjacent to the first light transmitting window, wherein: A low-energy photon group generated by the action of high-energy photons in the second scintillation crystal enters an adjacent scintillation crystal array through the first light transmission window and is received by a photosensor coupled with the adjacent scintillation crystal array; the group of low-energy photons generated by the high-energy photons acting within the first scintillation crystal can be detected almost exclusively by the one photosensor; the light distribution detected by the photosensors coupled by the one photosensor and the adjacent scintillator crystal array is subjected to crystal position decoding.
2. The detection module of claim 1, wherein the light guide layer further has a side surface connected between the first end surface and the second end surface, wherein Along the first transverse direction, the first end face having a larger dimension than the second end face to form a first contour boundary line between sides of light guiding layers of adjacent detection units along the first transverse direction, the first contour boundary line being lower than the second end face when viewed in a direction from the second end face to the first end face, and The first light reflecting layer extends from the front face of the scintillator array to the first contour boundary line.
3. The detection module of claim 1, wherein n is 1 or 1.5.
4. The detection module according to claim 1, wherein a second light reflecting layer is provided between detection units adjacent along the second lateral direction.
5. The detection module of claim 4, wherein the light guide layer has a uniform dimension along the longitudinal direction in a cross section parallel to the second lateral direction and the longitudinal direction, the second light reflective layer extending from a front face of the scintillation crystal array toward the photosensor and being spaced apart from the photosensor.
6. The detection module of claim 4, wherein the light guide layer further has a side surface connected between the first end surface and the second end surface, wherein Along the second transverse direction, the first end face having a dimension greater than a dimension of the second end face to form a second contour boundary line between sides of light guiding layers of adjacent detection units along the second transverse direction, the second contour boundary line being lower than the second end face when viewed in a direction from the second end face toward the first end face, and The second light reflecting layer extends from the front face of the scintillator array to the second contour line of intersection.
7. The detection module of claim 4, wherein a second light transmissive window is provided on the second light reflective layer to allow light to pass through the second light transmissive window to a photosensor coupled by an adjacent array of scintillation crystals along the second lateral direction.
8. The detection module of claim 7, wherein a number ratio of the scintillation crystal to the photosensor along the second lateral direction is 2:1.
9. The detection module of claim 7, wherein the light guide layer is in the shape of a regular quadrangular frustum.
10. The detection module of claim 7, wherein the second light transmissive window comprises one or more of a lower window adjacent a back side of the scintillation crystal array, an upper window adjacent a front side of the scintillation crystal array, a plurality of discrete windows evenly distributed, and side windows disposed on both sides of the first light reflective layer.
11. The detection module of claim 7, wherein adjacent detection cells are coupled by optical glue at the second light transmissive window.
12. The detection module of claim 1, wherein the first light transmissive window comprises one or more of a lower window adjacent a back side of the scintillation crystal array, an upper window adjacent a front side of the scintillation crystal array, a plurality of discrete windows evenly distributed, and side windows disposed on both sides of the first light reflective layer.
13. The detection module of claim 1, wherein adjacent detection cells are coupled by optical glue at the first light transmissive window.
14. The detection module of claim 1, wherein gaps between light guide layers of adjacent detection cells are filled with a light reflective material.
15. The detection module of claim 1, wherein a third light reflecting layer is disposed on the front side of the scintillation crystal array and between adjacent scintillation crystals within the scintillation crystal array.
16. An emission imaging device comprising the detection module of any one of claims 1-15.

Description

Detection module and emission imaging device having the same Technical Field The present invention relates to an emission imaging system, and in particular, to a detection module for an emission imaging device and an emission imaging device including the detection module. Background Emission imaging devices, including positron emission imaging devices, have been used for medical diagnosis. Taking positron emission imaging equipment as an example, by utilizing the phenomenon that a positron generated by positron isotope attenuation and negative electrons in a human body generate die out effect, a compound with a positron isotope label is injected into the human body, and a compound detection method is adopted, and gamma photons generated by die out effect are detected by a detection system to realize tomography. The detection system is generally formed by splicing and assembling a plurality of detection modules. The detection module comprises a scintillation crystal and a photosensor coupled to each other. The 511keV high-energy photons (i.e., gamma photons) produced by the die out effect react inside the scintillation crystal and are converted into visible light subgroups. The visible light sub-group can be emitted from the bottom surface of the scintillation crystal and captured by the photosensor. By the magnitude of the visible light signal collected in the photosensor, the response of gamma photons inside which scintillation crystal array occurs can be calculated by using the barycentric algorithm (Anger Logic). This process is called crystal decoding. Thus, the distribution information of isotopes in the human body can be obtained, and the computer is used for carrying out reconstruction combination operation, so that a three-dimensional tomographic image of the distribution of the labeled compounds in the human body can be obtained. The emission imaging device has remarkable effects in early diagnosis of various diseases, treatment scheme formulation and the like, but the existing emission imaging device has higher manufacturing cost, so that the examination expense of patients is high, which is extremely unfavorable for the popularization and application of the emission imaging device. Therefore, reducing the cost of the emissive imaging device from various aspects is a problem that is currently in need of solution. Disclosure of Invention In order to at least partially solve the problems of the prior art, according to one aspect of the present invention, a detection module for an emissive imaging device is provided. The detection module comprises a plurality of detection units arranged in a transverse plane, each of the plurality of detection units comprises a scintillation crystal array, a light guide layer and a photosensor, wherein the scintillation crystal array, the light guide layer and the photosensor are sequentially arranged along a longitudinal direction perpendicular to the transverse plane, the scintillation crystal array comprises a plurality of scintillation crystals arranged in the transverse plane, the receiving area of the photosensor is smaller than the cross-sectional area of the scintillation crystal array, the light guide layer is provided with a first end face and a second end face which are opposite along the longitudinal direction, the first end face is coupled to the scintillation crystal array, the second end face is coupled to the photosensor, and the area of the first end face is larger than the area of the second end face. Illustratively, a first light reflecting layer is disposed between adjacent detection units along a first lateral direction having a first lateral direction and a second lateral direction perpendicular to each other in the lateral plane, wherein a first light transmissive window is disposed on the first light reflecting layer to allow light to pass through the first light transmissive window to a photosensor coupled to an array of scintillation crystals adjacent along the first lateral direction. The light guiding layer also has a side surface connected between the first end surface and the second end surface, wherein, along the first lateral direction, a dimension of the first end surface is larger than a dimension of the second end surface to form a first contour boundary line between side surfaces of the light guiding layer of the adjacent detection units along the first lateral direction, the first contour boundary line being lower than the second end surface when seen in a direction from the second end surface to the first end surface, and the first light reflecting layer extends from a front surface of the scintillator array to the first contour boundary line. Illustratively, the number ratio of the scintillation crystal to the photosensor along the first lateral direction is 2:1. Illustratively, the number ratio of the scintillation crystal to the photosensor along the second lateral direction is n:1, where n is greater than or equal to 1. Illus