Online energy conforming method and system for full-digital PET system

Abstract

An on-line energy coincidence method for an all-digital PET system, comprising: a detection module conducting information collection on a scintillation pulse, forming a single event data frame and sending the single event data frame to an upper computer (S1); the upper computer conducting two-bit position distribution statistics on an incident gamma photon event and conducting position spectrum partition (S2); performing statistics on an energy distribution spectrum of each crystal bar, so as to acquire an energy correction value (S3); the detection module uploading a crystal bar partition data table and an energy peak correction data table (S4); starting information collection of on-line energy correction (S5); when an event is coming, according to a two-dimensional coordinate thereof, from the crystal partition table, searching for a crystal bar number corresponding thereto, and then, according to the crystal bar number, searching for an energy correction value from the energy correction table (S6); and sending data passing the energy coincidence to the upper computer (S7). The method achieves fully automatic and fast on-line energy coincidence, and not only achieves the requirements of the variable structure PET for the fully automatic and fast correction, but also filters useless data in a transmission medium to a greater degree at the same time, thereby achieving the purpose of increasing a valid data bandwidth.

Description

technical field

[0001] The invention relates to the fields of high-energy radiation detection imaging and digital signal processing, in particular to an online energy coincidence method for an all-digital PET system. Background technique

[0002] The current mainstream PET detector usually adopts the detection structure of array scintillation crystal coupled photoelectric conversion device. When the gamma photon is incident on a crystal bar in the array crystal, Compton scattering or photoelectric effect occurs, and visible light signals are generated. The photoelectric conversion device receives these light signals and converts them into corresponding electrical signal outputs. Using this electrical signal, you can The coordinates (X, Y) of the incident position of the gamma photon are calculated, and the number of the crystal bar where the gamma photon event is located is obtained according to the coordinate position, which is finally used to determine the Line of Response...

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