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High resolution and high sensitivity detectors for functional molecular imaging with radionuclides: the role of scintillator pixel size, photodetector anode pitch, collimation technique, and of the readout

机译:用于具有放射性核素的功能分子成像的高分辨率和高灵敏度探测器:闪烁体像素尺寸,光电探测器阳极间距,准直技术和读数的作用

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Good spatial resolution and high sensitivity are required for detectors to be used for most of the bio-medical research and application (small animal imaging, detection of small tumors). In this paper we report on parameter optimization of single photon gamma rays detectors. Simulations and measurements were performed for designing and building detectors for early detection of small tumors in breast and in small animal imaging. Critical parameters are: contrast and signal to noise ratio (SNR). Intrinsic performances (spatial resolution, pixel identification etc.) were optimized first. Arrays of scintillators (NaI(Tl)) of different pixel pitch (down to the present technological limits for NaI(Tl) arrays fabrication (pitch of 2/spl times/2 mm/sup 2/, 1.5/spl times/1.5 mm/sup 2/ and 1.2/spl times/1.2 mm/sup 2/)) were coupled to arrays of PSPMTs with two anode readout element dimensions (6/spl times/6 mm/sup 2/ and 3/spl times/3 mm/sup 2/). Detectors having field of view of 100/spl times/100 mm/sup 2/ and 150/spl times/200 mm/sup 2/ were designed and built. An electronics system for reading out all the anode pad signals has been designed and constructed. Finally the collimation technique was considered. The limits of the coded aperture option have been studied. Preliminary results of these studies are presented.
机译:检测器需要用于大多数生物医学研究和应用(小动物成像,小肿瘤检测)的良好空间分辨率和高灵敏度。在本文中,我们报告了单光子伽马射线探测器的参数优化。进行了仿真和测量,以设计和建造探测器,以及早发现乳房和小动物成像中的小肿瘤。关键参数是:对比度和信噪比(SNR)。首先优化内部性能(空间分辨率,像素标识等)。像素间距不同的闪烁体(NaI(Tl))阵列(低至NaI(Tl)阵列制造的当前技术极限(间距为2 / spl次/ 2 mm / sup 2 /,1.5 / spl次/1.5 mm / 2 /和1.2 / spl次/1.2 mm / sup 2 /))耦合到具有两个阳极读数元件尺寸(6 / spl次/ 6 mm / sup 2 /和3 / spl次/ 3 mm /)的PSPMT阵列sup 2 /)。设计并制造了具有100 / spl倍/ 100mm / sup 2 /和150 / spl倍/ 200mm / sup 2 /的视场的探测器。已经设计并构造了用于读出所有阳极垫信号的电子系统。最后考虑了准直技术。已经研究了编码孔径选项的限制。介绍了这些研究的初步结果。

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