PMT- cross-display scintillator block detector design and Monte Carlo study

IEEE Nuclear Science Symposuim & Medical Imaging Conference Pub Date : 2010-10-01 DOI:10.1109/NSSMIC.2010.5874217

Qingyang Wei, Yaqiang Liu, Tianyu Ma, Yan Xia, Shi Wang, Zhaoxia Wu, Yongjie Jin

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引用次数: 2

Abstract

Block detector using crystals coupled to circular photomultipliers (PMTs) is commonly used in positron emission tomography (PET). We design a novel PET block detector with cross-shape PMT layout (CSPL). The block detector consists of 9×9 lutetium orthosilicate (LSO) pixelated crystal array (2.2mm×2.2mm×10mm) and five PMTs (four 3/4 inch with circular envelope, one 3/8 inch with square envelope) arranging in a cross-shape layout with the small one in the middle. The crystals are separated by Teflon reflectors and optical grease to control the light distribution. Monte Carlo simulation package GATE is used to simulate the processes of both gamma ray interaction and light spread in LSO crystals. Impact of major resolution limiting parameters, including inter-crystal scattering, parallax effect and light spread in the crystals on the performance of the proposed detector design is investigated. Simulation results show that the proposed block detector design could get higher light collection and better position profile.

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PMT-交叉显示闪烁块探测器的设计与蒙特卡罗研究

在正电子发射断层扫描(PET)中，利用晶体耦合到圆形光电倍增管(pmt)的块探测器是一种常用的方法。设计了一种新型的交叉PMT结构的PET块检测器(CSPL)。块探测器由9×9正硅酸镥(LSO)像素化晶体阵列(2.2mm×2.2mm×10mm)和5个ppt(4个3/4英寸圆形包膜，1个3/8英寸方形包膜)组成，以十字形布局排列，小的在中间。晶体由聚四氟乙烯反射器和光学润滑脂分离，以控制光的分布。利用Monte Carlo模拟程序GATE模拟了伽马射线在LSO晶体中的相互作用和光传播过程。研究了主要的分辨率限制参数，包括晶体间散射、视差效应和光在晶体中的传播对所提出的探测器设计性能的影响。仿真结果表明，所提出的块探测器设计能够获得更高的光集和更好的位置轮廓。

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IEEE Nuclear Science Symposuim & Medical Imaging Conference

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