Detector for positron emission imaging device and positron emission imaging device

Abstract

The invention provides a detector for a positron emission imaging device and the positron emission imaging device. The detector includes a scintillation crystal module and a photoelectric sensor array, the scintillation crystal module includes a plurality of cylindrical scintillation crystal sheet units, each cylindrical scintillation crystal sheet unit has a through hole, and the plurality of cylindrical scintillation crystal sheet units have different through hole sizes A plurality of cylindrical scintillation crystal sheet units are sleeved along the thickness direction, and the scintillation crystal module formed by the sleeve has an upper end surface, a lower end surface, and a through hole penetrating from the upper end surface to the lower end surface, and the through hole is used to accommodate the object to be imaged. The photoelectric sensor array is coupled to the upper end surface of the scintillation crystal module or / and the lower end surface of the scintillation crystal module, and is used to detect the visible photons generated by the reaction between the gamma photon and the scintillation crystal module, wherein the gamma photon passes through the body of the object to be imaged The positron annihilation effect occurs. The detector has low processing difficulty, simple assembly, and high DOI decoding accuracy and position decoding capability.

Description

technical field [0001] The invention relates to the field of positron emission imaging, in particular to a detector for a positron emission imaging device and the positron emission imaging device. Background technique [0002] Medical positron emission tomography (Positron Emission Tomography, PET) is a representative product of international advanced medical equipment. It is a technology that uses radioactive elements to display the internal structure of the human or animal body. It is widely used clinically in tumors, heart disease, etc. Early diagnosis of cerebrovascular diseases and neurodegenerative diseases, formulation of treatment plans, prediction of prognosis and evaluation of drug efficacy, etc. [0003] In a traditional medical positron emission tomography system, the detector system generally consists of multiple square detector modules connected through a mechanical structure to form a cylindrical envelope structure, which is used to intercept and receive gamma...

AI Technical Summary

Problems solved by technology

[0005] (1) Crystal processing is difficult: Traditional square crystal designs often use small-sized scintillation crystal units to improve system resolution, but this method has strict requirements on crystal processing and is expensive;

[0006] (2) Edge effects: edge effects may appear in the discrete crystal assembly design, so that the detected photon position information cannot correctly reflect the light distribution, resulting in low decoding accuracy and low spatial resolution of imaging equipment;

[0007] (3) There is a position error in the assembly: the detector modules assembled together are prone to positioning errors, which leads to deviations in the detection of coincident events, which in turn affects the spatial resolution of the imaging device;

[0008] (4) Detection gap: detection gap includes crystal assembly gap: large assembly gap will be generated when discrete crystals are spliced, detection module gap: square detection modules cannot form a complete detection surface when arranged in a ring, both will lead to detection gap The emergence of, thereby reducing the system sensitivity

This method reduces the requirements for the difficulty of crystal processing technology to a certain extent, but it still cannot solve the problems caused by edge effects

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