Methods to extract more light from minute scintillation crystals used in an ultra-high resolution Positron Emission Tomography detector
Methods to extract more light from minute scintillation crystals used in an ultra-high resolution Positron Emission Tomography detector
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DOI：
10.1016/j.nima.2004.03.013
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发表时间：
2004-07-11
影响因子：
1.4
通讯作者：
Foudray, AM
中科院分区：
文献类型：
--
作者：
Levin, CS;Habte, F;Foudray, AM
最近，人们对开发用于超高分辨率正电子发射断层扫描（PET）系统的精细像素化位置敏感闪烁探测器产生了极大的兴趣，所述系统被设计用于乳腺癌检测、诊断和分期以及用于对小实验室动物进行成像。我们正在开发一种不同的高分辨率PET探测器设计，它可以在小于或等于1mm宽，>10mm厚的氧硅酸镥（LSO）晶体中促进几乎完全的闪烁光收集。该设计需要使用新颖配置的半导体光电探测器阵列，显著提高微小晶体的光收集纵横比。为了减少设计的复杂性和死区，我们正在研究使用1毫米厚的LSO片，除了离散的晶体棒，和使用的位置敏感雪崩光电二极管（PSAPDs），每个设备只需要四个读出通道，除了像素化APD阵列。使用与精细像素化APD阵列耦合的Imm厚的闪烁晶体片导致对泛光照射的伪离散响应：由于薄片中非常窄的光扩散函数，我们观察到尖锐（
Recently, there has been great interest in developing finely pixellated position-sensitive scintillation detectors for ultra-high-resolution Positron Emission Tomography (PET) systems designed for breast cancer detection, diagnosis, and staging and for imaging small laboratory animals. We are developing a different high-resolution PET detector design that promotes nearly complete scintillation light collection in less than or equal to1mm wide, >10mm thick lutetium oxyorthosilicate (LSO) crystals. The design requires the use of semiconductor photodetector arrays in novel configurations that significantly improve the light collection aspect ratio for minute crystals. To reduce design complexity and dead area we are investigating the use of I mm thick sheets of LSO in addition to discrete crystal rods, and the use of position-sensitive avalanche photodiodes (PSAPDs) which require only four readout channels per device, in addition to pixellated APD arrays. Using a I mm thick scintillation crystal sheet coupled to a finely pixellated APD array results in a pseudo-discrete response to flood irradiation: due to a very narrow light spread function in the thin sheet we observe sharp (