Visibility in differential phase-contrast imaging with partial coherence source  

作　　者：刘鑫 郭金川 彭翔 牛憨笨 

机构地区：[1]Institute of Optoelectronics Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China [2]Institute of Optoelectronics, Shenzhen University, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education, Shenzhen 518060, China

出　　处：《Chinese Physics B》2007年第6期1632-1636,共5页中国物理B（英文版）

摘　　要：This paper gives theoretical analysis of visibility of fringes, which is influenced by distances, temporal and spatial coherence of source, in hard x-ray differential phase-contrast imaging with microfocus x-ray source. According to the character of longitudinal periodicity of the interferogram, the setup is insensitive to mechanical drift and vibrations. The effect of temporal coherence of x-ray source is investigated and its related bandwidth is derived. Based on the theory of partially coherent light, it shows that the requirement for the spatial coherence of x-ray source is not strict and can be met by the general microfocus x-ray tube for x-ray differential phase-contrast imaging.This paper gives theoretical analysis of visibility of fringes, which is influenced by distances, temporal and spatial coherence of source, in hard x-ray differential phase-contrast imaging with microfocus x-ray source. According to the character of longitudinal periodicity of the interferogram, the setup is insensitive to mechanical drift and vibrations. The effect of temporal coherence of x-ray source is investigated and its related bandwidth is derived. Based on the theory of partially coherent light, it shows that the requirement for the spatial coherence of x-ray source is not strict and can be met by the general microfocus x-ray tube for x-ray differential phase-contrast imaging.

关 键 词：VISIBILITY differential phase-contrast interference fringes phase grating 

分 类 号：O436[机械工程—光学工程]