基于GATE仿真的分光法探测器优化设计

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清华大学辅仁网/2017-07-07

基于GATE仿真的分光法探测器优化设计

石涵¹, PENG Qiyu², 许剑锋³, 都东¹

1. 清华大学机械工程系, 北京 100084, 中国;
2. 劳伦斯伯克利国家实验室, 伯克利 94720, 美国;
3. 华中科技大学机械工程学院, 武汉 430074, 中国

GATE simulation based light sharing detector optimization

SHI Han¹, PENG Qiyu², XU Jianfeng³, DU Dong¹

1. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China;
2. Lawrence Berkeley National Laboratory, Berkeley 94720, USA;
3. School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

摘要:

输出: BibTeX | EndNote (RIS)

摘要基于分光法的晶体阵列解码技术是正电子发射成像系统最为高效的探测器设计方案之一, 但目前基于分光法的晶体阵列解码设计依赖于经验和实验迭代, 晶体解码和分光层设计缺少有效的仿真方法。该文采用了GATE仿真软件, 对分光法的探测器进行建模仿真, 提出了逐列逼近的优化算法对分光层反光片进行长度优化设计, 且对优化仿真中主要参数进行了分析, 并组装4 mm × 4 mm×25 mm、12×12阵列实验模块对所提方法进行验证。实验结果表明: 该基于GATE仿真的优化设计方法能有效实现分光法探测器晶体阵列解码的仿真以及解码斑点均匀分布的反光片长度优化设计。

关键词 ：正电子发射成像,GATE,探测器设计

Abstract：Crystal array decoding based on light sharing is one of the most efficient detector design schemes. However, detector module design depends heavily on the designer's experience and intuition and is largely based on trial and error. Simulations are needed to study the crystal array decoding and light sharing layer design. The GATE simulation toolkit is used to simulate a light sharing based detector with the reflectors in the light sharing layer then optimized by a column approximation optimization algorithm. Some key parameters in the simulation are then analyzed. The results show that the GATE simulation based optimization method can efficiently optimize the crystal array decoding in a light sharing detector.

Key words：positron emission tomography GATE detector design

收稿日期: 2015-02-15 出版日期: 2016-02-17

ZTFLH:

R445

基金资助:国家国际科技合作专项资助项目(2013DFB30270)

通讯作者:都东, 教授, E-mail: dudong@tsinghua.edu.cnE-mail: dudong@tsinghua.edu.cn

作者简介: 石涵(1988—), 男(汉), 四川, 博士研究生。

引用本文:

石涵, PENG Qiyu, 许剑锋, 都东. 基于GATE仿真的分光法探测器优化设计[J]. 清华大学学报（自然科学版）, 2016, 56(2): 200-205.
SHI Han, PENG Qiyu, XU Jianfeng, DU Dong. GATE simulation based light sharing detector optimization. Journal of Tsinghua University(Science and Technology), 2016, 56(2): 200-205.

链接本文:

http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2016.22.009或 http://jst.tsinghuajournals.com/CN/Y2016/V56/I2/200

图表:

图1　方块形探测器结构

图2　分光层反光片设计影响探测器解码图

图3　分光法探测器GATE仿真建模

图4　分光层反光片长度优化方案

图5　GATE仿真分光层优化流程图

表1　主要仿真参数

表2　反光片调节步长和位置误差容忍对优化速度的影响

图6　仿真事件采样数与平均定位误差的关系曲线

图7　给定仿真事件采样数时定位误差的概率分布

图8　探测器实验模块

图9　实验结果与仿真结果对比

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