A block detector for a multislice, depth-of-interaction MR-compatible PET
A block detector for a multislice, depth-of-interaction MR-compatible PET
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用于多层、交互深度 MR 兼容 PET 的块检测器
DOI：
10.1109/tns.2004.843091
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发表时间：
2005
影响因子：
1.8
通讯作者：
K. Minato
中科院分区：
文献类型：
--
作者：
S. Yamamoto;S. Takamatsu;H. Murayama;K. Minato
我们提出并测试了用于多层、交互深度 (DOI) MR 兼容正电子发射断层扫描 (PET) 的块探测器。该探测器由块探测器、四根光纤和光电倍增管 (PMT) 组成。块检测器是一种原硅酸镥 (LSO) DOI 检测器，由基于 Murayama 等人提出的概念排列成 2/spl times/2/spl times/2 矩阵的八个 LSO 组成。原型块探测器的单个闪烁体的尺寸为2/spl次/2/spl次/2mm。闪烁光子从闪烁体块探测器的侧面收集，并使用四根几米长的光纤传输到位置敏感 PMT (PSPMT) 的四个通道。计算 PSPMT 信号的输出以确定块检测器中伽马相互作用的位置。结果表明，虽然使用光纤造成的光损失约为 90%，但仍有足够的传输闪烁光子来获得光峰并计算伽马相互作用在具有合理间隔的块探测器中的位置。我们还修改了块检测器以提高检测器的性能。改进的块探测器的单个闪烁体的尺寸扩大到2.5毫米（横轴）/spl倍/3.5毫米（轴向）/spl倍/3.5毫米（深度）以提高灵敏度。改进的块检测器获得了良好的位置响应以及 5.6 ns 半峰全宽 (FWHM) 的时间分辨率。根据这些结果，我们得出结论，使用所提出的块检测器可以实现两环、两层 DOI-MR 兼容 PET。
We proposed and tested the a block detector for a multislice, depth-of-interaction (DOI) MR-compatible positron emission tomography (PET). The detector consists of a block detector, four optical fibers and photo-multiplier tubes (PMTs). The block detector is a lutetium oxyorthosilicate (LSO) DOI detector comprising eight LSOs arranged in a 2/spl times/2/spl times/2 matrix based on the concept proposed by Murayama et al. The size of a single scintillator of a prototype block detector was 2/spl times/2/spl times/2 mm. The scintillation photons are collected from the side of the scintillator block detector and are transferred to four channels of the position-sensitive PMT (PSPMT) using four optical fibers several meters long. The outputs of the PSPMT signals are calculated to determine the position of gamma interaction in the block detector. Results show that although the light loss from using the fiber was around 90%, there were sufficient transferred scintillation photons to obtain the photo-peak and to calculate the position of gamma interaction in the block detector with reasonable separation. We also modified the block detector to improve the performance of the detector. The size of a single scintillator of the modified block detector was enlarged to be 2.5 mm (transaxial) /spl times/ 3.5 mm (axial) /spl times/ 3.5 mm (depth) to improve the sensitivity. Good position responses as well as time resolution of 5.6-ns full-width at half-maximum (FWHM) were obtained for the modified block detector. With these results, we conclude that a two-rings, two-layer DOI-MR-compatible PET can be realized using the proposed block detector.