Open AccessA three-image algorithm for hard x-ray grating interferometry
Author(s) -
Daniele Pelliccia,
Luigi Rigon,
Fulvia Arfelli,
R.H. Menk,
Inna Bukreeva,
Alessia Cedola
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.019401
Subject(s) - interferometry , optics , grating , refraction , diffraction grating , diffraction , phase (matter) , physics , astronomical interferometer , scattering , image processing , phase contrast imaging , computer science , materials science , image (mathematics) , artificial intelligence , quantum mechanics , phase contrast microscopy
A three-image method to extract absorption, refraction and scattering information for hard x-ray grating interferometry is presented. The method comprises a post-processing approach alternative to the conventional phase stepping procedure and is inspired by a similar three-image technique developed for analyzer-based x-ray imaging. Results obtained with this algorithm are quantitatively comparable with phase-stepping. This method can be further extended to samples with negligible scattering, where only two images are needed to separate absorption and refraction signal. Thanks to the limited number of images required, this technique is a viable route to bio-compatible imaging with x-ray grating interferometer. In addition our method elucidates and strengthens the formal and practical analogies between grating interferometry and the (non-interferometric) diffraction enhanced imaging technique.