ON-LINE ENERGY COINCIDENCE METHOD AND SYSTEM FOR ALL-DIGITAL PET SYSTEM

摘要

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.