光子学报, 2017, 46 (3): 0304002, 网络出版: 2017-04-10
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
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 Positron Emission Tomography (PET) Silicon Photomultiplier (SiPM) Depth of Interaction (DOI) Light share technique Serpentine-light-path
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3.1×3.1×20 mm3); 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1.0~6.7 mm之间, 平均值为3.2 mm.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.
Abstract
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 serpentine-light-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 8×1 LSO array with a crystal size of 3.1×3.1×20 mm3 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 1 to 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.
魏清阳, 戴甜甜, 谷宇, 李向东. 基于蛇形光路的PET探测器作用深度提取方法[J]. 光子学报, 2017, 46(3): 0304002. WEI Qing-yang, DAI Tian-tian, GU Yu, LI Xiang-dong. Extraction of the Depth-of-interaction for PET Detectors Based on a Serpentine-light-path Design[J]. ACTA PHOTONICA SINICA, 2017, 46(3): 0304002.