Imaging detector designs based on flat panel PMT
Imaging detector designs based on flat panel PMT
复制标题
基于平板PMT的成像探测器设计
DOI：
10.1016/j.nima.2004.03.037
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发表时间：
2004
影响因子：
1.4
通讯作者：
F. Garibaldi
中科院分区：
文献类型：
--
作者：
R. Pani;R. Pellegrini;M. Cinti;C. Trotta;P. Bennati;F. Cusanno;F. Garibaldi
在过去的10年里，由于近距离定位，与传统的核相机相比，小视场成像仪在多个方向上表现出了优越的空间分辨率和灵敏度。以合理的成本支持高空间分辨率的设计是主要目标，为此已经提出了许多光电探测器设计。最近上市的滨松平板光电倍增管(PMT)显著提高了紧凑性，降低了PSPMT设计的封装比例，并降低了成本，使其成为一种有前景和现实的候选器件。本文分析了基于Hamamatsu H8500光电倍增管的小型伽马成像仪与不同的闪烁材料阵列CsI(Tl)和NaI(Tl)耦合的空间分辨率潜力，晶体像素尺寸在0.2-1.8 mm之间。重点探讨了它的成像性能及其在闪烁照相、闪烁照相和小动物成像中的应用局限性。结果表明，该系统具有很好的位置线性度、空间分辨率和增益。此外，阳极的阵列结构有利于开发新的电荷分析方法来精确计算伽马射线相互作用的位置。遗憾的是，光采样仍然受到太大的阳极尺寸的限制，这影响了光电探测器在超高空间分辨率应用中的性能。
Over the last 10 years, because of close proximity positioning, small field of view imagers have demonstrated superior spatial resolution and sensitivity at multiple orientations compared to the conventional nuclear camera. Design favoring high spatial resolution at a reasonable cost is the main goal and to this aim a number of photodetector designs have been proposed. The recent availability of Hamamatsu Flat Panel photomultiplier (PMT) makes it a promising and realistic candidate by significant improving compactness, packing fraction of PSPMT designs and lowering costs. In this paper we analyze the spatial resolution potential of a small gamma imager based on Hamamatsu H8500 PMT coupled to different scintillation material arrays like CsI(Tl) and NaI(Tl), with crystal pixel size ranging between 0.2 and 1.8mm. The imaging performances and limitations for application in scintimammography, linphoscintigraphy and small animal imaging are critically explored. The results show very good position linearity, spatial resolution and gain. Furthermore the array structure of anodes favours the exploiting of new methods of charge analysis for a precise calculation of gamma ray interaction position. Unfortunately the light sampling is still limited by too big anode size that impairs photodetector performances for ultra high spatial resolution applications.