In-line phase contrast for weakly absorbing materials with a microfocus x-ray source |
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Authors: | Zhang Di Li Zheng Huang Zhi-Feng Yu Ai-Min and Sha Wei |
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Institution: | Department of Engineering Physics, Tsinghua University, Beijing 100084, China |
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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. |
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Keywords: | in-line phase contrast intensity distribution microfocus Fresnel diffraction |
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