Revised noise model of dark-field imaging using a grating interferometer

被引:4
作者
Wang, Zhili [1 ]
Xu, Wen [1 ]
Wang, Tianxiang [1 ]
Ren, Kun [1 ]
Zhao, Liming [1 ]
Liu, Bo [1 ]
Chen, Heng [1 ]
机构
[1] Hefei Univ Technol, Sch Elect Sci & Appl Phys, Hefei 230009, Anhui, Peoples R China
基金
中国国家自然科学基金;
关键词
X-ray dark-field imaging; Neutron dark-field imaging; Grating interferometer; Noise; Visibility; CONTRAST;
D O I
10.1016/j.nima.2021.165113
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
Inspired by recent experimental results, we report on a revised noise model of dark-field imaging using a grating interferometer. The accurate knowledge of the noise of the dark-field image is essential for noise reduction and image quality improvement. A revised noise model is theoretically derived in terms of the standard deviation of the dark-field image. While a low visibility assumption was made in previous models, the revised noise model makes no assumption on the visibility. It is shown by synchrotron radiation experimental results that, with a high visibility, the revised noise model agreed quantitatively with experimentally measured values, while previous models overestimated the noise present in the dark-field image significantly. Therefore, the revised model provides an accurate description of the noise behavior of grating-based dark-field imaging, and can be of use for energy-resolved dark-field imaging and potential dose optimizations.
引用
收藏
页数:5
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