Coincidence system and method in positive electron dislocation scan

Abstract

The invention relates to the medical slice imaging and nuclear-imaging field, in particular to a first-group board card, a signal buffering unit, a second-group receiving board card, a data buffering unit, a reference clock 17, a clock adjusting unit and an on-site programmable gate array that are used for a conforming system in a positron slice scanning device; the method is characterized in that the on-site programmable gate array is utilized to judge the time, the position and the energy among all matters, and two matters that pass through the judging and selecting regulations form a conforming case. By inducting the on-site programmable gate array, the case information captured by a front-end detector module of a PET apparatus can be processed fast and high-efficiently by compiling hardware description language, so as to ensure whether the conforming matters happen or not. The method is an improvement of the process of the prior PET conforming system. The method can finish the process of the conforming system high-efficiently and fast by using a piece of FPGA and can lead the system not to be inducted into the dead time while the high system sensitivity is obtained.

Description

technical field [0001] The invention relates to the fields of medical tomography and nuclear imaging, in particular to a method for designing coincident systems in positron emission tomography (PET) equipment. Background technique [0002] Coincidence detection is the essence of positron emission tomography (PET), and its design directly affects the performance of the entire system. The positrons produced by the decay of radiopharmaceuticals injected into the living body undergo an annihilation reaction with the electrons in the living body to produce two gamma photon pairs with opposite directions and an energy of 511keV. If they are captured by the detector at the same time within a certain time window, it is called A match was detected. Such as figure 1 Middle 1 means that the annihilation of positrons produces two gamma photons 2a and 2b with equal energy and opposite directions, which can be detected by two oppositely placed detectors 3a and 3b. 1 means contains 18 ...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of high cost and long production cycle in the prior art, the present invention adopts FPGA as the core to realize PET coincidence system processing, the hardware circuit is simple to realize, the cost is low, and a kind of coincidence system in positron emission tomography that can be realized quickly and design method

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