Analysis of partial coherence in grating-based phase-contrast X-ray imaging

被引:7
|
作者
Wang, Zhili [2 ]
Liu, Xiaosong [2 ]
Zhu, Peiping [2 ]
Huang, Wanxia [2 ]
Yuan, Qingxi [2 ]
Li, Enrong [2 ]
Liu, Yijin [1 ]
Zhang, Kai [2 ]
Hong, Youli [2 ]
Wu, Ziyu [1 ,2 ,3 ]
机构
[1] Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230026, Peoples R China
[2] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
[3] Chinese Acad Sci, Ctr Theoret Phys, Sci Facil, Beijing 100049, Peoples R China
关键词
Partial coherence; Self-image; Fractional Talbot distance; Visibility; TOMOGRAPHY;
D O I
10.1016/j.nima.2009.10.126
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
We report here a quantitative analysis of the effect of partial coherence on grating-based phase-contrast X-ray imaging. The self-image intensity has been derived through the phase-space formulation in the framework of the Wigner distribution. Based on the behavior of the self-image visibility, the minimum required spatial coherence length is given for three different types of gratings. Furthermore, we show that the coherence requirement, at different fractional Talbot distances, increases linearly with the Talbot order for the three types of gratings. The approach we presented can also be successfully applied to the Talbot-Lau geometry. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:319 / 322
页数:4
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