A compact position-sensitive detector for PET
A compact position-sensitive detector for PET
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用于 PET 的紧凑型位置敏感探测器
DOI：
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发表时间：
1994
期刊：
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通讯作者：
T. Yamashita
中科院分区：
文献类型：
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作者：
M. Watanabe;T. Omura;H. Kyushima;Y. Hasegawa;T. Yamashita
研制了一种用于正电子发射层析成像（PET）系统的高分辨率BGO块探测器。该探测器由一个新开发的紧凑位置敏感光电倍增管（PS-PMT）和一个元件尺寸为2.8 mm/spl倍/6.8 mm/spl倍/30 mm的8(X)/spl倍/4(Y) BGO阵列组成。PS-PMT在28毫米方形/ 10倍/20毫米高的金属封装中具有10级金属通道阳极和交叉线阳极。从PET适用性方面对PS-PMT和块检测器的性能进行了评价。对于511 keV /spl γ /-射线，ps - pmt耦合到单个BGO片段，符合时间分辨率分别为4.4 ns FWHM和9.5 ns FWTM，能量分辨率约为30%。通过测量每个BGO段的检测器响应函数（drf）来评估块检测器的空间分辨率。DRFs的平均FWHM值在X方向上为3.0 mm，在Y方向上为6.8 mm。在不同的活动水平下测量块检测器的计数率性能，当计数率高达100 kcps时，晶体编码中没有明显的错误定位。采用位置敏感探测器，设计了一套紧凑的3D-PET系统，用于动物研究
A high resolution BGO block detector has been developed for a positron emission tomography (PET) system. The detector consists of a newly developed compact position-sensitive photomultiplier tube (PS-PMT) and an 8(X)/spl times/4(Y) BGO array of which element size is 2.8 mm/spl times/6.8 mm/spl times/30 mm. The PS-PMT has ten stages of metal channel dynodes and crossed-wire anodes in a 28 mm square/spl times/20 mm high metal package. The performance of the PS-PMT and the block detector was evaluated in terms of applicability to PET. The coincidence timing resolution was 4.4 ns FWHM and 9.5 ns FWTM, and the energy resolution was about 30% for 511 keV /spl gamma/-rays, with the PS-PMTs coupled to single BGO segments. The spatial resolution of the block detector was evaluated by measuring the detector response functions (DRFs) for each BGO segment. The average FWHM values of the DRFs were 3.0 mm in the X direction, and 6.8 mm in the Y direction. Count rate performance of the block detector was measured at different activity levels, when no distinct mispositioning in crystal coding was seen at count rates up to 100 kcps. A compact 3D-PET system dedicated to animal studies was designed by adopting the position-sensitive detectors.<<ETX>>