基于连续晶体PET探测器模块电子学设计  

The Readout Electronics for the Continuous Crystal PET Detector Module

作　　者：周宇[1] 王永纲[1] 

机构地区：[1]中国科学技术大学近代物理系,合肥230026

出　　处：《核电子学与探测技术》2014年第3期307-311,共5页Nuclear Electronics & Detection Technology

基　　金：国家基金资助项目(11075155;11275194)

摘　　要：和传统的基于分割晶体PET探测器相比,基于连续晶体的PET探测器具有设计结构简单、能量分辨率高、探测器效率高以及低造价等优点,近年来得到广泛的研究。基于连续晶体PET探测器的最大难点是要用探测器获得闪烁光分布,进而通过作用点定位算法计算γ光子的作用位置。探测器模块电子学需要读出和获取闪烁光的分布,因而电子学变得相对复杂。论文针对自行建立的基于连续LYSO晶体和神经网络定位算法的PET探测器模块的信号读出和数据获取的要求,设计和实现了64通道数据读出和获取电子学系统。该系统采用8片8通道、50 Mbps、串行输出、12 bit ADC对每个通道进行数字化,从海量的核事例中遴选出有效的核事例,在FPGA内实现数据打包、定时符合、基线恢复等功能。经过测试,电路各通道噪声低,增益一致性好。整个电子学系统结构紧凑、性能优良,适合基于连续晶体PET探测器的相关实验研究和应用研究。Compared with PET detectors basing on the traditional split crystals ,PET detectors basing on continu-ous crystals having a simple structure , high energy resolution and the detector efficiency is high , as well as low cost, etc..The biggest difficulty of the continuous crystal PET detector is using the probe to get the blinking light distribution to calculate the interaction point of the γ-photon by the interaction point position algorithm . The detector module electronics needs to read out and obtain the distribution of the scintillation light , and thus reading out and data acquisition electronics becomes relatively complex .In this paper , we create our own PET detector basing on continuous LYSO crystals and neural network positioning algorithm module , design and real-ize 64 channel data acquisition and readout electronics system .The system uses eight 8-channel, 50Mbps, 12bit ADC for each channel to digitize from the massive nuclear instances for selecting effective examples of nu -clear data and package within the FPGA timing in line , baseline restoration and other functions .After the test , the circuit for each channel has low -noise, gain consistency and compact structure , excellent performance of the entire electronics system , based on the continuous crystal PET detectors , experimental and applied re-search .

关 键 词：正电子发射断层扫描成像 现场可编程门阵列 符合定时 硅酸钇镥闪烁晶体 

分 类 号：TL8[核科学技术—核技术及应用]