In-line phase contrast for weakly absorbing  materials with a microfocus x-ray source

doi:10.1088/1009-1963/15/8/017

中国物理B ›› 2006, Vol. 15 ›› Issue (8): 1731-1737.doi: 10.1088/1009-1963/15/8/017

In-line phase contrast for weakly absorbing materials with a microfocus x-ray source

章　迪, 李　政, 黄志峰, 禹爱民, 沙　薇

Department of Engineering Physics, Tsinghua University, Beijing 100084, China

收稿日期:2005-12-09 修回日期:2006-04-22 出版日期:2006-08-20 发布日期:2006-08-20
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No 10475044).

In-line phase contrast for weakly absorbing materials with a microfocus x-ray source

Zhang Di(章迪)^†, Li Zheng(李政), Huang Zhi-Feng(黄志峰), Yu Ai-Min(禹爱民), and Sha Wei(沙薇)

Department of Engineering Physics, Tsinghua University, Beijing 100084, China

Received:2005-12-09 Revised:2006-04-22 Online:2006-08-20 Published:2006-08-20
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No 10475044).

摘要/Abstract

摘要： For weakly absorbing materials, image contrast can be enhanced by phase contrast in formation. The effectiveness of the in-line phase contrast technique relies on its ability to record intensity data which contain information on the x-ray's phase shift. Four kinds of approaches to the relationship between intensity distribution and phase shift are reviewed and discussed. A micro-focal x-ray source with high geometrical magnification is used to acquire phase contrast images. A great improvement on image quality is shown and geometrical parameters are modified for comparison between different imaging positions.

Abstract: For weakly absorbing materials, image contrast can be enhanced by phase contrast in formation. The effectiveness of the in-line phase contrast technique relies on its ability to record intensity data which contain information on the x-ray's phase shift. Four kinds of approaches to the relationship between intensity distribution and phase shift are reviewed and discussed. A micro-focal x-ray source with high geometrical magnification is used to acquire phase contrast images. A great improvement on image quality is shown and geometrical parameters are modified for comparison between different imaging positions.

Key words: in-line phase contrast, intensity distribution, microfocus, Fresnel diffraction

中图分类号: (X- and γ-ray sources, mirrors, gratings, and detectors)

07.85.Fv

42.30.Kq (Fourier optics) 42.30.Wb (Image reconstruction; tomography)

章　迪, 李　政, 黄志峰, 禹爱民, 沙　薇. In-line phase contrast for weakly absorbing materials with a microfocus x-ray source[J]. 中国物理B, 2006, 15(8): 1731-1737.

Zhang Di(章迪), Li Zheng(李政), Huang Zhi-Feng(黄志峰), Yu Ai-Min(禹爱民), and Sha Wei(沙薇). In-line phase contrast for weakly absorbing materials with a microfocus x-ray source[J]. Chinese Physics, 2006, 15(8): 1731-1737.

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In-line phase contrast for weakly absorbing materials with a microfocus x-ray source

In-line phase contrast for weakly absorbing materials with a microfocus x-ray source

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