Performance comparisons of continuous miniature crystal element (cMiCE) detectors
Performance comparisons of continuous miniature crystal element (cMiCE) detectors
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DOI：
10.1109/tns.2006.882296
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发表时间：
2006-10-01
影响因子：
1.8
通讯作者：
Miyaoka, Robert S.
中科院分区：
文献类型：
--
作者：
Ling, Tao;Lee, Kisung;Miyaoka, Robert S.
在本文中，我们研究了连续微型晶体元件（cMiCE）探测器的性能特点。评估了具有25 mm × 25 mm × 4 mm厚的LSO晶体和具有50 mm × 50 mm × 8 mm厚的LYSO晶体的版本。两种检测器均采用64通道平板光电倍增管（PMT）。使用Anger（即，简单质心）定位和基于统计的定位（SBP）算法。我们还比较了使用不同反射材料（例如，TFE特氟隆、白色涂料和聚合物镜面膜）。4 mm厚的LSO晶体的平均能量分辨率为20%，8 mm厚的LYSO晶体的平均能量分辨率为16%至21%，取决于反射材料。4 mm厚晶体的平均固有空间分辨率为1.8 mm半高全宽（FWHM），用于Anger定位到晶体边缘的3 mm内，用于SBP定位到边缘的2 mm内，为1.14 mm FWHM。8 mm厚晶体的平均固有空间分辨率为2.2 mm FWHM，用于Anger定位到晶体边缘的8 mm内，以及1.3至1.5 mm FWHM（取决于所使用的反射材料），用于SBP到边缘的2 mm内。固有的空间分辨率报告没有校正点源的大小。点光斑通量的半高宽约为0.52 mm。SBP算法显著提高了cMiCE探测器的固有空间分辨率、定位结果的线性度和有效视场（FOV）。
In this paper, we investigated the performance characteristics of continuous miniature crystal element (cMiCE) detectors. Versions with a 25 mm by 25 mm by 4 mm-thick LSO crystal and with a 50 mm by 50 mm by 8 mm-thick LYSO crystal were evaluated. Both detectors utilize a 64-channel flat panel photomultiplier tube (PMT). The intrinsic spatial resolution for the detectors was evaluated using Anger (i.e., simple centroid) positioning and a statistics based positioning (SBP) algorithm. We also compared the intrinsic spatial resolution for the 8-mm-thick LYSO crystal using different reflective materials (e.g., TFE Teflon, white paint, and a polymer mirror film) applied on the entrance surface of the crystal. The average energy resolution was 20% for the 4-mm-thick LSO crystal and ranged from 16% to 21%, depending upon reflective material, for the 8-mm-thick LYSO crystal. The average intrinsic spatial resolution for the 4-mm-thick crystal was 1.8-mm full width at half maximum (FWHM) for Anger positioning to within 3 mm of the crystal's edge and 1.14-mm FWHM for SBP to within 2 mm of the edge. The average intrinsic spatial resolution for the 8-mm-thick crystal was 2.2-mm FWHM for Anger positioning to within 8 mm of the crystal's edge and 1.3- to 1.5-mm FWHM (depending on reflective material used) for SBP to within 2 mm of the edge. Intrinsic spatial resolution is reported without correcting for point source size. The point spot flux had a FWHM of about 0.52 mm. The SBP algorithm resulted in significant improvement in intrinsic spatial resolution, linearity of positioning result, and effective field of view (FOV) for our cMiCE detector.