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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. 相似文献
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