Optimization of the surface area of laser-induced layers for PET detectors with depth-of-interaction
Optimization of the surface area of laser-induced layers for PET detectors with depth-of-interaction
复制标题
具有交互深度的 PET 探测器激光诱导层表面积的优化
DOI：
10.1016/j.nima.2021.165425
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发表时间：
2021
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;F. Nishikido;T. Sakai;T. Yamaya
具有相互作用深度（DOI）信息的探测器被用于正电子发射断层扫描（PET）扫描器中，以提高辐射探测的灵敏度和空间分辨率的均匀性。我们最近开发了一系列的双端探测器，使用晶体棒通过应用亚表面激光雕刻（SSLE）技术分割为7，13和20 DOI段。由于采用SSLE技术后，窄晶棒非常脆弱，因此获得亚毫米级的空间分辨率对于我们的探测器至关重要。在这项工作中，我们专注于优化窄晶棒的SSLE诱导层的表面积，以解决脆性问题，同时保持足够的晶段分离。SSLE层被诱导到五个尺寸为1.5× 1的晶体棒的横截面的中间。5× 20 mm 3，距每个晶体棒的两个相对侧边的距离为0.1、0.2、0.3、0.4或0.5 mm。所有晶体被分割成四个DOI段，并从最佳晶体段识别和能量分辨率的角度评估了由一个晶体棒组成的五组双端DOI探测器的性能，同时减轻了易碎性问题。通过Anger型计算获得了探测器的三维位置图，并对晶体识别性能进行了评价。对于其中SSLE诱导层与晶体的两个相对侧边缘的距离为0.1、0.2和0.3 mm的探测器，获得了具有大于7的距离宽度比（DWR）的段的清楚分离。对于其他两个探测器，DWR小于4.4。在距离晶体两侧边0.1、0.3和0.5mm处引入SSLE层的探测器的平均能量分辨率分别为11.8± 0.2%、10.6±0.2%和8.8±0.2%。在能量分辨率和晶体片段鉴定之间存在折衷。SSLE诱导层的最佳表面积被接受为晶体段识别和脆性之间的权衡。被SSLE诱导层分段的晶体在横截面的中间，距离两个相对的横向边缘0.3 mm，被认为是具有可接受的性能和脆性的良好候选。
Detectors with depth-of-interaction (DOI) information are utilized in positron emission tomography (PET) scanners to improve the sensitivity of radiation detection and the uniformity of spatial resolution. We recently developed a series of dual-ended detectors using crystal bars segmented by applying the subsurface laser engraving (SSLE) technique to 7, 13 and 20 DOI segments. It is crucial to achieve the submillimeter level spatial resolution for our detector as the narrow crystal bars are highly fragile after applying the SSLE technique. In this work, we focused on optimizing the surface area of the SSLE-induced layer to the narrow crystal bars in order to resolve the issue of fragility while maintaining sufficient crystal segment separation. The SSLE layers were induced to the middle of the cross section of the five crystal bars with dimensions of 1.5× 1. 5× 20 mm 3 with a distance of 0.1, 0.2, 0.3, 0.4 or 0.5 mm from the two opposite lateral edges of each crystal bar. All crystals were segmented into four DOI segments and the performances of the five sets of dual-ended DOI detectors consisting of one crystal bar were evaluated from the viewpoints of optimum crystal segment identification and energy resolution while mitigating the fragility issue. The 3D position maps of the detectors were obtained by the Anger-type calculation, and the crystal identification performance was evaluated. Clear separation of the segments with a distance-to-width ratio (DWR) larger than 7 was obtained for the detectors in which the distances of the SSLE-induced layer from the two opposite lateral edges of the crystal were 0.1, 0.2 and 0.3 mm. The DWR for the other two detectors was less than 4.4. Average energy resolutions of 11.8±0.2%, 10.6±0.2% and 8.8±0.2% were obtained for the detectors in which the SSLE layers were induced with 0.1, 0.3 and 0.5 mm distances from the two opposite lateral edges of the crystal, respectively. There was a compromise between energy resolution and crystal segment identification. The optimum surface area of the SSLE-induced layer was accepted as a trade-off between crystal segment identification and fragility. The crystal segmented by the SSLE-induced layer at the middle of the cross section with a distance of 0.3 mm from the two opposite lateral edges was considered to be a good candidate with acceptable performance and fragility.
影响因子：
1.8
作者：
Tsuda, T;Murayama, H;Orita, N
通讯作者：
Orita, N
使用通过次表面激光雕刻分割的晶棒开发具有 TOF 和 DOI 功能的双端探测器
DOI：
--
发表时间：
2019
期刊：
Nuclear Inst. and Methods in Physics Research
影响因子：
--
作者：
Akram Mohammadi;Sodai Takyu;Fumihiko Nishikido;Eiji Yoshida;Keiji Shimizu;Toshiaki Sakai;Taiga Yamaya
通讯作者：
Taiga Yamaya