Three-dimensional phase retrieval in propagation-based phase-contrast imaging

摘要

We present a solution to the phase problem in near-field x-ray (propagation) imaging. The three-dimensionalcomplex-valued index of refraction is reconstructed from a set of projections recorded in the near-field (Fresnel)setting at a single detector distance. The solution is found by an iterative algorithm based only on the measureddata and the three-dimensional tomographic (Helgason-Ludwig) consistency constraint without the need forfurther a priori knowledge or other restrictive assumptions.