Visibility in differential phase-contrast imaging with partial coherence source
Liu Xin(刘鑫)a)b), Guo Jin-Chuan(郭金川)b), Peng Xiang(彭翔)b), and Niu Han-Ben(牛憨笨)b)†
a Institute of Optoelectronics Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; b Institute of Optoelectronics, Shenzhen University, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education, Shenzhen 518060, China
Abstract 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.
Received: 13 September 2006
Revised: 12 October 2006
Accepted manuscript online:
PACS:
07.85.Fv
(X- and γ-ray sources, mirrors, gratings, and detectors)
Fund: Project supported by the State Key
Program of National Natural Science of China (Grant No 60532090).
Cite this article:
Liu Xin(刘鑫), Guo Jin-Chuan(郭金川), Peng Xiang(彭翔), and Niu Han-Ben(牛憨笨) Visibility in differential phase-contrast imaging with partial coherence source 2007 Chinese Physics 16 1632
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