Energy Resolution in CMOS SSPM Detectors Coupled to an LYSO Scintillator
Energy Resolution in CMOS SSPM Detectors Coupled to an LYSO Scintillator
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DOI：
10.1109/tns.2009.2016092
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发表时间：
2009-06-01
影响因子：
1.8
通讯作者：
Christian, James F.
中科院分区：
文献类型：
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作者：
Johnson, Erik B.;Barton, Paul;Christian, James F.
采用CMOS技术制造的sspm由30和50 μ m平方像素阵列组成，总面积为1.5 mm x 1.5 mm，填充系数（填充密度）分别为61%和29%，用于测量脉冲激光光源的光子强度分辨率。不同的噪声源（例如，串扰，暗计数和电子）对能量分辨率有有害影响，本研究着眼于这些贡献的相对大小。尽管噪声影响随着填充系数和有效面积的增大而增加，但本工作研究了这些噪声项与增加多余偏置或填充系数时检测效率的提高之间的权衡。用LYSO闪烁晶体（1.5 mm x 1.5 mm x 3 mm）测量了122 keV、511 keV、662 keV和1275 keV等不同伽马射线的能量分辨率，并将其与脉冲激光的结果进行了比较，以检查所有噪声对能量分辨率的影响。SSPM响应可以用二项式函数来描述。当超过70%的像素被触发时，能量分辨率包含来自SSPM的二项式探测器响应的检测器响应的大量贡献，其中包含有限数量的像素元素。
SSPMs fabricated using CMOS technology consisting of arrays of 30- and 50-mu m square pixels in 1.5 mm x 1.5 mm total area with high, 61 %, and low, 29 %, fill factors (packing density) were used to measure the photon intensity resolution for a pulsed laser light source. Different sources of noise (i.e., cross talk, dark counts, and electronic) have a deleterious effect on the energy resolution, and this work looks at the relative sizes of these contributions. Even though noise effects increase with larger fill factors and active area, this work examines the trade-off between these noise terms and the improvement in the detection efficiency with increased excess bias or fill factor.The energy resolutions from various gamma rays, including 122 keV, 511 keV, 662 keV, and 1275 keV, measured with an LYSO scintillation crystal (1.5 mm x 1.5 mm x 3 mm) were compared to the pulsed laser results to examine all noise contributions to the energy resolution.The SSPM response can be described by a binomial function. When greater than 70 % of the pixels are triggered, the energy resolution contains a substantial contribution from the detector response that arises from a binomial detector response of the SSPM, which contains a finite number of pixel elements.