Detector characteristics of CCDs for high resolution gamma ray imaging

2002 IEEE Nuclear Science Symposium Conference Record Pub Date : 2002-11-10 DOI:10.1109/NSSMIC.2002.1239416

W. Ryder, R. Ott, J. Lees, A. Keay, D. Bassford, G. Fraser

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引用次数: 2

Abstract

We are developing a high resolution gamma ray imager for use in Nuclear Medicine at energies up to /spl sim/150 keV. The imager is based upon a charge coupled device (CCD) coated with a polycrystalline scintillator to improve the detection efficiency. Three CCDs from E2V Ltd, bearing 100 /spl mu/m, 300 /spl mu/m and 500 /spl mu/m layers of Gd/sub 2/O/sub 2/S(Tb) (GADOX) have been tested. These CCDs have a pixel size of 44 /spl mu/m. The modulation transfer function (MTF) and relative detection efficiency of the CCDs have been measured using a /sup 241/Am (59.5 keV) source. The MTFs were estimated using the edge spread response function (ESRF) to derive the line spread function (LSF). The measurements show that significant improvements in detector efficiency, together with minimal loss of spatial resolution, follow from the use of a CCD with a 500 /spl mu/m thick GADOX scintillator rather than the standard 100 /spl mu/m scintillator thickness. The 500 /spl mu/m GADOX coated CCD thus has highly promising characteristics for use in a small, high resolution gamma ray imager.

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用于高分辨率伽马射线成像的ccd探测器特性

我们正在开发一种用于核医学的高分辨率伽马射线成像仪，能量高达150 keV。该成像仪采用包覆多晶闪烁体的电荷耦合器件(CCD)，以提高探测效率。测试了E2V有限公司的三个ccd，分别承受100 /spl μ m、300 /spl μ m和500 /spl μ m的Gd/sub 2/O/sub 2/S(Tb) (GADOX)层。这些ccd的像素大小为44 /spl mu/m。采用/sup 241/Am (59.5 keV)源测量了ccd的调制传递函数(MTF)和相对检测效率。利用边缘扩展响应函数(ESRF)估计mtf，推导出线扩展函数(LSF)。测量结果表明，使用500 /spl mu/m厚度的GADOX闪烁体而不是标准的100 /spl mu/m厚度的CCD，可以显著提高探测器的效率，并将空间分辨率的损失降至最低。因此，500 /spl mu/m GADOX涂层CCD具有非常有前途的特性，可用于小型高分辨率伽马射线成像仪。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2002 IEEE Nuclear Science Symposium Conference Record

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