Linear algorithms for phase retrieval in the Fresnel region. 3. Validity conditions
Optics Communications(2017)
摘要
We describe the relationship between different forms of linearized expressions for the spatial distribution of intensity of X-ray projection images obtained in the Fresnel region. We prove that under the natural validity conditions some of the previously published expressions can be simplified without a loss of accuracy. We also introduce modified validity conditions which are likely to be fulfilled in many relevant practical cases, and which lead to a further significant simplification of the expression for the image-plane intensity, permitting simple non-iterative linear algorithms for the phase retrieval.
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关键词
Phase retrieval,Phase contrast,Fresnel diffraction,X-ray imaging
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