Improvement of crystal identification performance for a four-layer DOI detector composed of crystals segmented by laser processing
Improvement of crystal identification performance for a four-layer DOI detector composed of crystals segmented by laser processing
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激光加工分割晶体组成的四层 DOI 探测器的晶体识别性能改进
DOI：
10.1016/j.nima.2017.05.051
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发表时间：
2017
影响因子：
1.4
通讯作者：
T. Yamaya
中科院分区：
文献类型：
--
作者：
A. Mohammadi;N. Inadama;E. Yoshida;F. Nishikido;K. Shimizu;T. Yamaya
我们已经开发了一个四层的相互作用深度（DOI）探测器与单面光子读出，其中与图案化的反射器插入的分段晶体分别确定的愤怒型计算。在没有反射器的情况下，分段晶体之间的光学条件影响晶体识别能力。我们这项工作的目的是提高晶体识别性能的四层DOI检测器，使用晶体分割与最近开发的激光加工技术，包括激光加工边界（LPB）。探测器由2× 2× 4mm3LYSO晶体和阳极间距为4.5mm的4× 4阵列多阳极光电倍增管（PMT）组成。通过Anger计算方法计算探测器的2D位置图。首先，针对由2× 2晶体阵列组成的单层探测器，研究了晶体间采用室温硫化橡胶（RTV）粘接、空气耦合和LPB分段晶体三种不同光学条件对晶体识别的影响。与耦合RTV橡胶或空气的晶体阵列相比，具有LPB的晶体阵列在2D位置图中给出了晶体响应之间的最短距离，这是由于具有LPB的分段晶体之间的大量串扰。这些结果被用来寻找光学条件，提供最佳的晶体之间的距离在2D位置图的四层DOI检测器的响应。研究了由8× 8晶体阵列组成的四层DOI探测器的晶体识别性能，第一层晶体的晶体识别性能是不可接受的。通过改变第一层所有2× 2晶体阵列之间的光学条件为RTV耦合，改善了第一层的晶体识别。通过在分段阵列的第一层的所有晶体与第二层和第三层的一些晶体之间组合不同的光学条件，观察到更多的改善。
We have developed a four-layer depth of interaction (DOI) detector with single-side photon readout, in which segmented crystals with the patterned reflector insertion are separately identified by the Anger-type calculation. Optical conditions between segmented crystals, where there is no reflector, affect crystal identification ability. Our objective of this work was to improve crystal identification performance of the four-layer DOI detector that uses crystals segmented with a recently developed laser processing technique to include laser processed boundaries (LPBs). The detector consisted of 2× 2× 4 mm 3 LYSO crystals and a 4× 4 array multianode photomultiplier tube (PMT) with 4.5 mm anode pitch. The 2D position map of the detector was calculated by the Anger calculation method. At first, influence of optical condition on crystal identification was evaluated for a one-layer detector consisting of a 2× 2 crystal array with three different optical conditions between the crystals: crystals stuck together using room temperature vulcanized (RTV) rubber, crystals with air coupling and segmented crystals with LPBs. The crystal array with LPBs gave the shortest distance between crystal responses in the 2D position map compared with the crystal array coupled with RTV rubber or air due to the great amount of cross-talk between segmented crystals with LPBs. These results were used to find optical conditions offering the optimum distance between crystal responses in the 2D position map for the four-layer DOI detector. Crystal identification performance for the four-layer DOI detector consisting of an 8× 8 array of crystals segmented with LPBs was examined and it was not acceptable for the crystals in the first layer. The crystal identification was improved for the first layer by changing the optical conditions between all 2× 2 crystal arrays of the first layer to RTV coupling. More improvement was observed by combining different optical conditions between all crystals of the first layer and some crystals of the second and the third layers of the segmented array.
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影响因子：
1.8
作者：
Tsuda, T;Murayama, H;Orita, N
通讯作者：
Orita, N
影响因子：
3.5
作者：
T. Yamaya;E. Yoshida;T. Inaniwa;S. Sato;Yasunori Nakajima;H. Wakizaka;D. Kokuryo;Atsushi B. Tsuji;T. Mitsuhashi;H. Kawai;H. Tashima;F. Nishikido;N. Inadama;H. Murayama;H. Haneishi;M. Suga;S. Kinouchi
通讯作者：
T. Yamaya;E. Yoshida;T. Inaniwa;S. Sato;Yasunori Nakajima;H. Wakizaka;D. Kokuryo;Atsushi B. Tsuji;T. Mitsuhashi;H. Kawai;H. Tashima;F. Nishikido;N. Inadama;H. Murayama;H. Haneishi;M. Suga;S. Kinouchi
影响因子：
3.5
作者：
Yamamoto, Seiichi;Imaizumi, Masao;Hatazawa, Jun
通讯作者：
Hatazawa, Jun
影响因子：
3.5
作者：
Yamaya, Taiga;Inaniwa, Taku;Murayama, Hideo
通讯作者：
Murayama, Hideo