基于蛇形光路的PET探测器作用深度提取方法  

Extraction of the Depth-of-interaction for PET Detectors Based on a Serpentine-light-path Design

作　　者：魏清阳[1] 戴甜甜[2] 谷宇[1] 李向东 

机构地区：[1]北京科技大学自动化学院,北京100083 [2]中日友好医院放射肿瘤科,北京100029 [3]中国船舶工业系统工程研究院,北京100094

出　　处：《光子学报》2017年第3期62-68,共7页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.11605008;11505300);中央高校基本科研业务费(No.FRF-TP-15-114A1)资助~~

摘　　要：为实现正电子发射断层成像(Positron Emission Tomography,PET)探测器的作用深度(Depth Of Interaction,DOI)信息获取,本文提出一种基于分光技术的探测器设计方案.探测器采用晶体单元与硅光电倍增管(Silicon Photomultiplier,SiPM)一对一耦合、蛇形光路的设计和单端Anger加权读出方法进行DOI解码.基于GATE软件进行蒙特卡罗模拟,建立8×1的LSO晶体阵列(单根晶体尺寸3.1×3.1×20mm3);模拟泛场照射获取位置查找表;并进行不同深度的模拟,获得各晶体在各深度的空间分辨率.结果显示所模拟的探测器模块DOI分辨率在1.0~6.7mm之间,平均值为3.2mm.本文提出的基于蛇形光路的PET探测器方案能在维持系统成本和复杂度的前提下实现DOI解码,提升PET系统的成像性能.To obtain the Depth Of Interaction（DOI）information for Positron Emission Tomography（PET）,we proposed a novel detector design based on the light sharing technique.The detector used scintillators and silicon photomultipliers（SiPMs）with one to one coupling,employed the serpentinelight-path reflector scheme and the single-end Anger logic readout technique.Monte Carlo simulations were carried out to verify the design via GATE toolkit.An 8×1LSO array with a crystal size of 3.1×3.1×20mm3 was built.A flood source for generating position look-up table and five beam sources irradiating at different depths of the crystals were simulated and then calculated.The result shows that the average DOI resolution is 3.2 mm（ranging from 1to 7 mm）.In conclusion,we propose a novel detector design based on a serpentine-light-path scheme to realize DOI decoding which is a low-cost and practical direction for clinical PET systems.

关 键 词：正电子发射断层成像(PET) 硅光电倍增管 作用深度(DOI) 分光技术 蛇形光路 

分 类 号：TL812.1[核科学技术—核技术及应用]