Visibility in differential phase-contrast imaging with partial coherence source

• 来源期刊: 中国物理（英文版）
• 关键词: visibility differential phase-contrast interference fringes phase grating
• 年，卷（期）: 2007,（6）
• 页码范围: 1632-1636
• 页数: 5页
• 语种: 英文

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.