Modeling the Moire fringe visibility of Talbot-Lau X-ray grating interferometry for single-frame multi-contrast imaging
Modeling the Moire fringe visibility of Talbot-Lau X-ray grating interferometry for single-frame multi-contrast imaging
复制标题
DOI：
10.1364/oe.400928
复制
发表时间：
2020-08-31
期刊：
影响因子：
3.8
通讯作者：
Xie, Weiping
中科院分区：
文献类型：
--
作者：
Deng, Kai;Li, Jing;Xie, Weiping
X射线光栅干涉测量中的莫尔条纹法具有通过单帧成像获得多对比度数据的优点。然而，莫尔条纹的可见性如何受到系统参数的影响，如失调角，仍然缺乏研究，虽然它与图像数据的信噪比密切相关。本文提出了莫尔条纹可见度的简化模型，揭示了莫尔条纹可见度可以表示为一个与错位角有关的正弦函数与一个相对独立的因子的乘积。下面的实验结果进一步表明，在垂直于莫尔条纹取向的方向上的检测器像素之间的串扰是莫尔条纹的可见度降低的另一个主要原因。(C)根据OSA开放获取出版协议的条款，2020年美国光学学会
Moire fringe method in X-ray grating interferometry is characterized by its advantage to obtain multi-contrast data through single-frame imaging. However, how the visibility of the Moire fringe is influenced by the system parameters, such as the misalignment angle, still lacks investigation, although it closely relates to the signal-to-noise ratio of the image data. In this paper, a simplified model of the Moire fringe visibility is presented, which reveals that the Moire fringe visibility can be expressed as the product of a misalignment-angle-related "sine" function and a relatively independent factor. The following experimental results further suggest that the crosstalk between the detector pixels in the direction perpendicular to the Moire fringe orientation is another main cause for the visibility reduction of the Moire fringes. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement