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MTF of columnar phosphors with a homogenous part: an analytical approach.
Medical & Biological Engineering & Computing ( IF 3.2 ) Pub Date : 2020-08-19 , DOI: 10.1007/s11517-020-02243-4
Konstantinos Psichis 1 , Nektarios Kalyvas 2 , Ioannis Kandarakis 2 , George Panayiotakis 1
Affiliation  

A method for the theoretical estimation of the MTF of columnar phosphors with a homogeneous part at the end used in X-ray imaging has been developed. This method considers the light transport inside the scintillator through an analytical modelling, the optical photon beams distribution on the scintillator-optical sensor interface, and uses the definition of the PSF and a Gauss fitted LSF to estimate the MTF of an indirect detector. This method was applied to a columnar CsI:Tl scintillator and validated against experimental results found in literature, and a good agreement was observed. It was found that, by increasing the pixel size of the optical detector and the thickness of the scintillator, the MTF decreased as expected. This method may be used in evaluating the performance of the columnar phosphors used in medical imaging, given their physical and geometrical characteristics.Graphical abstract (a) Side view of a part of the scintillator where five crystal columns with homogeneous ends attached to an optical sensor is shown. (b) Propagation of two random optical photon beams emitted from point K with different angles of emission is shown. All the symbols are explained analytically in the text.

中文翻译:

具有均质部分的柱状荧光粉的 MTF:一种分析方法。

已经开发了一种用于在 X 射线成像中使用的末端具有均匀部分的柱状荧光粉的 MTF 的理论估计方法。该方法通过分析建模考虑闪烁体内部的光传输、闪烁体-光学传感器界面上的光学光子束分布,并使用 PSF 的定义和高斯拟合 LSF 来估计间接探测器的 MTF。该方法应用于柱状 CsI:Tl 闪烁体,并根据文献中的实验结果进行验证,观察到了良好的一致性。发现,通过增加光学探测器的像素尺寸和闪烁体的厚度,MTF如预期的那样降低。该方法可用于评估医学成像中使用的柱状荧光粉的性能,给出了它们的物理和几何特征。图形摘要 (a) 闪烁体的一部分的侧视图,其中显示了五个具有均质末端的晶体柱连接到光学传感器。(b) 显示了从 K 点以不同发射角度发射的两个随机光学光子束的传播。文中对所有符号进行了解析解释。
更新日期:2020-08-19
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