减小模板状NaI(Tl)探测器的边缘死区

Reducing the unusable areas of modular NaI(Tl) detector

用在环状 SPECT系统中的 Na I(Tl)探测器模板存在着严重的边缘死区。介绍了一些减少该死区的办法 ,包括 :一个 PMT管跨接两个探测器模板 ,在边缘刻槽等等。实验结果证明通过这些处理 ,这个死区可以减小到

This paper presents some methods to reduce the unusable areas at the edges of modular small plate NaI(Tl) crystals that are used in a cylindrical SPECT system. Generally the unusable area is about half the PMT's width. In our approach, the PMT at the edge is shared by two adjacent modules; and two grooves parallel to the edge, one on the entrance surface, the other on the exit surface were cut on crystal. Using the centroid algorithn to calculate the position, we found the intrinsic resolution could be reduced to 5 mm.