Simulated performances of pixelated CsI(Tl) scintillation screens with different micro-column shapes and array structures in X-ray imaging.
Simulated performances of pixelated CsI(Tl) scintillation screens with different micro-column shapes and array structures in X-ray imaging.
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不同微柱形状和阵列结构的像素化CsI(Tl)闪烁屏在X射线成像中的模拟性能
DOI：
10.1038/s41598-018-34852-3
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发表时间：
2018-11-14
影响因子：
4.6
通讯作者：
Ni C
中科院分区：
文献类型：
--
作者：
Chen H;Gu M;Liu X;Zhang J;Liu B;Huang S;Ni C
采用Geant 4 Monte Carlo模拟程序，对不同CsI（Tl）微柱形状和阵列结构的氧化硅微孔阵列模板像素化CsI（Tl）闪烁屏的X射线成像性能进行了模拟。微柱的形状包括正方形、六边形和圆形，阵列结构包括正方形和六边形排列。像素化CsI（Tl）闪烁屏的间距大小设置为4 µm，入射X射线能量设置为20 keV。沿着沿着CsI（Tl）微柱传播的闪烁光子的数目与微柱的闪烁光子的总数的比率随着微柱的侧表面上的全反射时间的增加而逐渐减小。然而，这些比值与微柱的形状和X射线在微柱横截面上的入射位置密切相关，特别是对于圆形微柱。由均匀X射线泛场激发的底部光输出从高到低的顺序对应于具有相同横截面积的圆形、正方形和六边形CsI（Tl）微柱。此外，具有正方形和六边形阵列结构的像素化CsI（Tl）闪烁屏的调制传递函数（MTF）方面的所有空间分辨率都超过100 lp/mm。然而，具有六边形阵列结构的像素化屏的分辨率比具有正方形阵列结构的屏的分辨率高约8.5%。而且，在相同厚度下，前一种屏比后一种屏具有更高的探测量子效率（DQE）。与其他像素化屏相比，具有圆形微柱和六边形阵列结构的像素化CsI（Tl）闪烁屏在X射线成像中具有上级性能。
The performances of the pixelated CsI(Tl) scintillation screens based on oxidized silicon micro-pore array templates with different CsI(Tl) micro-column shapes and array structures in X-ray imaging were simulated using the Geant4 Monte Carlo simulation code. The shapes of the micro-columns include square, hexagonal and circular, and the array structures include square and hexagonal arrangements. The pitch size of the pixelated CsI(Tl) scintillation screens was set to 4 µm, and the incident X-ray energy was set to 20 keV. The ratios of the number of scintillation photons that propagate along the CsI(Tl) micro-columns to the total number of scintillation photons of the micro-columns gradually decrease with the increase in total reflection time on the lateral surfaces of the micro-columns. However, these ratios are closely related to the shapes of the micro-columns and the incident positions of X-ray on the cross-sections of the micro-columns, especially for the circular micro-column. The sequence of bottom light outputs stimulated by a uniform flood field of X-ray from high to low corresponds to the circular, square and hexagonal CsI(Tl) micro-columns with the same cross-section areas. In addition, all spatial resolutions in terms of modulation transfer functions (MTFs) for the pixelated CsI(Tl) scintillation screens with square and hexagonal array structures are over 100 lp/mm. However, the resolution for the pixelated screen with the hexagonal array structure is approximately 8.5% higher than that for the screen with the square array structure. Moreover, the former screen has a higher detective quantum efficiency (DQE) than the latter screen at the same thickness. The pixelated CsI(Tl) scintillation screen with circular micro-column and hexagonal array structure in X-ray imaging has superior performance compared to other pixelated screens in this work.
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影响因子：
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作者：
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DOI：
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发表时间：
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