Optimized Crystal Surface Treatment for Crosshair Light-Sharing TOF-DOI PET Detector
Optimized Crystal Surface Treatment for Crosshair Light-Sharing TOF-DOI PET Detector
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DOI：
10.1109/trpms.2023.3255557
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发表时间：
2023-05
影响因子：
4.4
通讯作者：
E. Yoshida;H. Kang;Fujino Obata;T. Yamaya
中科院分区：
文献类型：
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作者：
E. Yoshida;H. Kang;Fujino Obata;T. Yamaya
PET探测器的符合分辨时间（CRT）和相互作用深度（DOI）分辨率受晶体表面处理和反射材料的影响，两者之间难以达到平衡。我们已经开发了十字准线光共享（CLS）检测器作为一个高分辨率的飞行时间DOI检测器。CLS探测器在2-D晶体阵列中使用三层反射材料，以在一对晶体内形成环结构，从而即使在2-D晶体阵列中也可以获取DOI信息。在这项研究中，我们研究了晶体表面处理和探测器性能之间的关系。使用了三种类型的LYSO：Ca：1）对所有晶体表面进行机械抛光（MP）; 2）具有单侧锯切表面的晶体（1 S）;和3）具有双侧锯切表面的晶体（2S）。MP晶体显示出最好的CRT为286 ps，但最差的DOI分辨率为7-8 mm。对于1 S晶体，CRT略微退化至296 ps，但获得约5 mm的DOI分辨率。对于2S晶体，CRT显著退化到332 ps，DOI分辨率与1 S晶体相当。1 S的晶阵，平衡性最好。
The coincidence resolving time (CRT) and depth-of-interaction (DOI) resolution of PET detectors are affected by the crystal surface treatment and the reflective material, and it is difficult to achieve a balance between their effects. We have developed the crosshair light-sharing (CLS) detector as a high-resolution time-of-flight-DOI detector. The CLS detector uses a three-layered reflective material in a 2-D crystal array to form a loop structure within a pair of crystals, allowing DOI information to be acquired even in the 2-D crystal array. In this study, we investigated the relationship between the crystal surface treatment and the performance of the detector. Three types of LYSO:Ca were used: 1) all crystal surfaces were mechanical polishing (MP); 2) crystals with the one-sided saw-cut surface (1S); and 3) crystals with the two-sided saw-cut surfaces (2Ss). The MP crystals showed the best CRT of 286 ps, but the worst DOI resolution of 7–8 mm. For the 1S crystals, the CRT was slightly degraded to 296 ps, but the DOI resolution of about 5 mm was obtained. For the 2S crystals, the CRT was significantly degraded to 332 ps and the DOI resolution was equivalent to that of the 1S. The crystal array with the 1S showed the best balance.