Experimental Validation of a Gamma Detector With a Novel Light-Guide-PMT Geometry to Reduce Dead Edge Effects
Experimental Validation of a Gamma Detector With a Novel Light-Guide-PMT Geometry to Reduce Dead Edge Effects
复制标题
采用新型光导 PMT 几何结构减少死边效应的伽玛探测器的实验验证
DOI：
--
复制
发表时间：
2020
影响因子：
4.4
通讯作者：
M. Goorden
中科院分区：
文献类型：
--
作者：
Beien Wang;R. Kreuger;J. Huizenga;F. Beekman;M. Goorden
基于光电倍增管（PMT）的闪烁相机在分子成像中占主导地位，但具有在边缘附近位置估计严重退化（死边缘效应）的缺点。这导致灵敏度损失，并可能在分子乳腺成像等应用和某些SPECT设备中引起严重问题。使用较小的光传感器或半导体检测器可以解决这个问题，但会导致成本增加。在这里，我们提出了一个伽马探测器的基础上，标准的光电倍增管与一个新的光导光电倍增管的几何形状，大大减少了死边。在我们的设计中，单片碘化钠（铊）闪烁体读出的正方形光电倍增管放置在交错排列。在闪烁体的边缘，我们插入了额外的光导来模拟半尺寸的PMT。对探测器性能进行了评估，用于99 mTc成像;在整个探测器上测得的平均空间分辨率为3.6 mm，在临界边缘的30 mm范围内降低至4.0 mm。闪烁体的死边缘<3 mm。由于使用了12 mm密封，因此总死边缘<15 mm，这比传统的Anger相机（死边缘约40 mm）有了显著改进。因此，所提出的几何形状可以用于创建具有减少的死边缘的经济的伽马探测器。
Photomultiplier tube (PMT)-based scintillation cameras are predominant in molecular imaging but have the drawback that position estimation is severely degraded near the edges (dead edge effect). This leads to sensitivity losses and can cause severe problems in applications like molecular breast imaging and in certain SPECT devices. Using smaller light sensors or semiconductor detectors can solve this issue but leads to increased costs. Here we present a gamma detector based on standard PMTs with a novel light-guide-PMT geometry that strongly reduces dead edges. In our design, a monolithic NaI(Tl) scintillator is read out by square PMTs placed in a staggered arrangement. At the edge of the scintillator we inserted additional light-guides to emulate half-size PMTs. Detector performance was assessed for 99mTc imaging; an average spatial resolution of 3.6 mm was measured over the whole detector, degrading to 4.0 mm within 30 mm to the critical edge. The dead edge of the scintillator is <3 mm. Since a 12-mm seal was used, the overall dead edge is <15 mm, which is a significant improvement over conventional Anger cameras (~40-mm dead edge). Therefore, the presented geometry can be useful in creating economical gamma detectors with reduced dead edges.
DOI：
10.1016/j.nima.2013.08.080
发表时间：
2014-01-11
期刊：
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment
影响因子：
--
作者：
Cai L;Lai X;Shen Z;Chen CT;Meng LJ
通讯作者：
Meng LJ
使用双头 CZT 伽玛相机进行低剂量分子乳腺成像的概念验证。
影响因子：
3.8
作者：
Hruska,CarrieB;Weinmann,AmandaL;O'Connor,MichaelK
通讯作者：
O'Connor,MichaelK
全视场模块化伽玛相机。
DOI：
--
发表时间：
1990
期刊：
Journal of nuclear medicine : official publication, Society of Nuclear Medicine
影响因子：
--
作者：
Milster,TD;Aarsvold,JN;Barrett,HH;Landesman,AL;Mar,LS;Patton,DD;Roney,TJ;Rowe,RK;Seacat3rd,RH
通讯作者：
Seacat3rd,RH