Correction of the charge sharing in photon-counting pixel detector data
Correction of the charge sharing in photon-counting pixel detector data
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DOI：
10.1016/j.nima.2008.03.080
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发表时间：
2008-06-11
影响因子：
1.4
通讯作者：
Ponchut, Cyril
中科院分区：
文献类型：
--
作者：
Ponchut, Cyril
尽管光子计数像素检测器阵列提供能量鉴别能力，但它们的能量分辨率受到相邻像素之间光电电荷扩散的限制。这种效应通常被称为电荷共享，在测量的光谱中引起低能尾部，并且对于小像素尺寸特别重要。为了纠正这种影响，迭代反卷积方法已被开发并应用于与Medipix 2光子计数芯片收集的数据。所获得的光谱从电荷共享校正，而且显示出比原始光谱更好的能量分辨率。例如，Cd-109源的K α（22.1 keV）和K β（25 keV）发射线被重建为两个分离良好的峰。将揭示该方法的原理。同步加速器光束，X射线管和放射源获得的各种结果将显示。(C)2008年由Elsevier B. V.出版。
Although photon-counting pixel detector arrays provide energy discrimination capabilities, their energy resolution is limited by the diffusion of the photoelectric charge between neighboring pixels. This effect often referred to as charge sharing induces a low-energy tail in the measured spectra and is particularly significant for small pixel sizes. In order to correct this effect, an iterative deconvolution method has been developed and applied to data collected with the Medipix2 photon-counting chip. The obtained spectra are corrected from charge sharing and moreover show a better energy resolution than the raw spectra. For instance the K alpha (22.1 keV) and K beta (25 keV) emission lines of a Cd-109 source are reconstructed as two well-separated peaks. The principle of the method will be exposed. Various results obtained with synchrotron beams, X-ray tubes and radioactive sources will be shown. (C) 2008 Published by Elsevier B.V.