Open AccessEffect of insufficient temporal coherence on visibility contrast in X-ray grating interferometry
Author(s) -
Wataru Yashiro,
Daiji Noda,
Kentaro Kajiwara
Publication year - 2018
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.26.001012
Subject(s) - visibility , optics , interferometry , grating , phase contrast imaging , coherence (philosophical gambling strategy) , contrast (vision) , physics , speckle pattern , differential phase , materials science , phase (matter) , phase contrast microscopy , quantum mechanics
X-ray grating interferometry, which has been spotlighted in the last decade as a multi-modal X-ray imaging technique, can provide three independent images, i.e., absorption, differential-phase, and visibility-contrast images. We report on a cause of the visibility contrast, an effect of insufficient temporal coherence, that can be observed when continuous-spectrum X-rays are used. This effect occurs even for a sample without unresolvable random structures, which are known as the main causes of visibility contrast. We performed an experiment using an acrylic cylinder and quantitatively explained the visibility contrast due to this effect.