Potential for reducing the numbers of SiPM readout surfaces of laser-processed X’tal cube PET detectors
Potential for reducing the numbers of SiPM readout surfaces of laser-processed X’tal cube PET detectors
复制标题
减少激光加工 X’tal 立方体 PET 探测器的 SiPM 读出表面数量的潜力
DOI：
--
复制
发表时间：
2013
影响因子：
3.5
通讯作者：
T. Yamaya
中科院分区：
文献类型：
--
作者：
Y. Hirano;N. Inadama;E. Yoshida;F. Nishikido;H. Murayama;Mitsuo Watanabe;T. Yamaya
我们正在开发一个三维（3D）的位置敏感探测器与各向同性的空间分辨率，X 'tal立方体。最初，我们的设计包括一个晶体块，所有六个表面都覆盖着多像素光子计数器（MPPC）阵列。在本文中，我们研究的可行性，减少表面上的MPPC阵列必须连接，以降低系统的复杂性的目的。我们评估了两种激光处理的X 'tal立方体的3 mm和2 mm节距段，同时改变4 × 4 MPPC阵列的数量下降到两个表面。采用亚表面激光雕刻技术将三维网格制作成单片晶体块。通过Anger型计算得到三维洪水直方图。两个品质因数，峰谷比和距离宽度比，被用来评估晶体识别性能。对于3 mm的X 'tal立方体，即使在2-表面配置中也获得了清晰的分离，并且平均峰谷比和距离宽度比分别为6.7和2.6。同时，在2 mm的X 'tal立方体中，6面结构可以分离所有的晶体，甚至2面结构也可以分离所有的晶体，但2面结构的泛色直方图相对收缩，特别是在平行于敏感面的平面上。然而，最小峰谷比没有低于3.9。我们得出结论，减少MPPC读出表面的数量对于3 mm和2 mm X 'tal立方体都是可行的。
We are developing a three-dimensional (3D) position-sensitive detector with isotropic spatial resolution, the X’tal cube. Originally, our design consisted of a crystal block for which all six surfaces were covered with arrays of multi-pixel photon counters (MPPCs). In this paper, we examined the feasibility of reducing the number of surfaces on which a MPPC array must be connected with the aim of reducing the complexity of the system. We evaluated two kinds of laser-processed X’tal cubes of 3 mm and 2 mm pitch segments while varying the numbers of the 4 × 4 MPPC arrays down to two surfaces. The sub-surface laser engraving technique was used to fabricate 3D grids into a monolithic crystal block. The 3D flood histograms were obtained by the Anger-type calculation. Two figures of merit, peak-to-valley ratios and distance-to-width ratios, were used to evaluate crystal identification performance. Clear separation was obtained even in the 2-surface configuration for the 3 mm X’tal cube, and the average peak-to-valley ratios and the distance-to-width ratios were 6.7 and 2.6, respectively. Meanwhile, in the 2 mm X’tal cube, the 6-surface configuration could separate all crystals and even the 2-surface case could also, but the flood histograms were relatively shrunk in the 2-surface case, especially on planes parallel to the sensitive surfaces. However, the minimum peak-to-valley ratio did not fall below 3.9. We concluded that reducing the numbers of MPPC readout surfaces was feasible for both the 3 mm and the 2 mm X’tal cubes.