医疗卫生装备2018，Vol.39Issue(5)：22-28,63,8.DOI:10.7687/j.issn1003-8868.2018.05.022
基于分光窗口法的高能光子反应深度计算
High-energy photon depth of interaction calculation based on light-sharing-window method
摘要
Abstract
Objective To propose a method for high-energy photon 3D decoding of PET detector to decode reactive crystal position and calculate γ ray depth in the scintillating crystal. Methods Light transmitting windows were set between the crystal arrays, visible photon groups were guided to distribute in the photoelectric sensor array during a single event, and sensor signal intensity was regulated to realize position and depth decoding of the high-energy photon.Monte Carlo method was used to compare the designs of different light transmitting windows to determine the effects of the crystal surface treatment mode on the results. Experiments were executed for further verification. Results The experimental results had consistency with simulation ones;the signal received through the reaction crystal was always stronger than that through the adjacent, which could decode the reaction crystals; the relations between the depth of interaction (DOI) and energy differences of the photo sensors were monotonic with the changes of DOI,and thus could be used to calculate the DOI;when using single window,the DOI vs.Diff.Energy curves had two segments which were not desired for DOI measurement;crystals with rough surfaces were more desired since the qualities of their DOI vs.Diff.Energy curves were better;the dual window method had the best DOI vs.Diff.Energy curves in term of linearity.Conclusion The method can realize 3D decoding of the discrete crystal array,which improves the energy resolution of the PET system. [Chinese Medical Equipment Journal, 2018,39(5):22-28,63]关键词
分光窗口法/高能光子/反应深度/位置解码/PET/晶体阵列Key words
light-sharing-window method/high-energy photon/depth of interaction(DOI)/position decoding/PET/crystal array分类
医药卫生引用本文复制引用
杨明明,谢思维,应高阳,黄秋,赵指向,颜琼,苏志宏,许剑锋,彭旗宇..基于分光窗口法的高能光子反应深度计算[J].医疗卫生装备,2018,39(5):22-28,63,8.基金项目
国家自然科学基金重大项目(51627807) （51627807）
中国国际科学技术合作项目(2013DFB30270) （2013DFB30270）
中国南方智谷创新团队项目(2014CXTD02) （2014CXTD02）
国家自然科学基金广东联合基金重大项目(U1501256) （U1501256）
