A phase retrieval algorithm for polychromatic x-ray in-line phase contrast imaging

摘要

In-line phase contrast imaging using micro-focus x-ray source is an important diagnostic tool in medicine, biology and materials science. The phase retrieval enables us to obtain material information from the gray of the phase-contrast image. A phase retrieval algorithm based on phase-attenuation and Fourier-wavelet regularization was proposed, which only need one single projection image and can deal with the case of large Fresnel propagator corresponding to high spatial resolution imaging. And the energy response function of detector and x-ray spectral density distribution of source were considered in this algorithm. The effectiveness of the proposed approach was tested by experimental image of silica aerogel.