信号形状法优化PET探测器光电倍增管分压电路  

Optimization of divider circuit of photomultiplier tube of PET detector with signal shape

作　　者：曲华[1] 王昌耿 吕绮雯 熊健 吴和宇 

机构地区：[1]天津工业大学理学院,天津300387 [2]赛诺格兰科技(北京)有限公司,北京100013

出　　处：《天津工业大学学报》2015年第1期73-77,共5页Journal of Tiangong University

基　　金：国家科技支撑计划项目(2012BAI13B06)

摘　　要：采用主动式光电倍增管分压电路,通过改变分压电路中电阻和电容的参数值,调节PMT级间电压,以优化输出信号的性能;利用MATLAB编程,控制高频示波器采集信号的形状,对这些数值信号形状数据进行拟合计算,得到信号的平均上升时间,通过不断改变电路元件参数值,对比分析结果,得到分压电路最优的元件工作参数,使PET系统的时间分辨从397 ps上升到359 ps.The bias circuit of the photomultiplier tube is an active divider. The output signal was optimized by changing thedivider circuit parameters, such as signal damping resistance and charge compensation capacitance. A MATLABprogram was used to control the high -frequency oscilloscope to acquire signal waveform, to fit the numericalsignal shape to calculate signal rising time. By comparing those calculated parameters with changing the circuitelement values and analyzing circuit performance, the divider circuit for R9800 PMT was optimized. The timeresolution of PET system is improved from 397 ps up to 359 ps.

关 键 词：信号形状法 PET控测器 光电倍增管 分压电路 上升时间 

分 类 号：TN152[电子电信—物理电子学]