Preliminary study of depth of interaction measurement for a PET detector

Preliminary study of depth of interaction measurement for a PET detector
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PET探测器交互深度测量的初步研究

DOI:
10.1088/1674-1137/35/11/017
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发表时间:
2011-11
期刊:
影响因子:
3.6
通讯作者:
--
中科院分区:
物理与天体物理3区
文献类型:
--
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在这项工作中,我们研究了位置灵敏光电倍增管(PS-PMT)R8900-C12耦合的两层LiSO和BGO闪烁体晶体阵列探测相互作用深度(DOI)的可行性。设计了一种前端电子器件,对不同的晶体获得不同的脉冲形状,以获得深度信息。采用二重积分的方法,得到了两个晶体的分割积分比的DOI直方图,作为判断相互作用层的标准。通过沿模块一侧扫描22nA狭缝光源测量的DOI准确率,Lyso层为98%,BGO层为95%。在511keV下,LYSO和BGO的能量分辨率分别为13.1%和17.1%。我们在两层的2D位置直方图上都获得了良好的晶体分离。这些结果可用于制造高空间分辨率的PET扫描仪。
In this work we studied the feasibility of detecting the depth of interaction (DOI) with two layers of crystal arrays of LYSO and BGO scintillators coupled to a position-sensitive photomultiplier tube (PS-PMT) R8900-C12. A front-end electronics was designed, with which we got different pulse shapes for different crystals to obtain depth information. With the double integration method, we got the DOI histogram of a divided integration ratio of two crystals as the standard to determine the layer-of-interaction. The DOI accuracy, measured by scanning a 22Na slit source along the side of the module, was 98% for the LYSO layer and 95% for the BGO layer. The energy resolution at 511keV was 13.1% for LYSO and 17.1% for BGO. We obtained good crystal separation in 2D position histograms of both layers. These results could be useful in the manufacture of PET scanners with high spatial resolutions.
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发表时间: 1999-06-01
影响因子: 1.8
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