Papers › Fast implicit diffusive dark-field retrieval for single-exposure, single-mask x-ray imaging

Fast implicit diffusive dark-field retrieval for single-exposure, single-mask x-ray imaging

11 Nov 2022arXiv:2211.07399links table onlyarchive 2025-07-28

Mario A. Beltran, David M. Paganin, Michelle K. Croughan, Kaye S. Morgan

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Complementary to conventional and phase X-ray radiography, dark-field imaging has become central in visualizing diffusive scattering signal due to the spatially-unresolved texture within an object. To date most diffusive-dark-field retrieval methods require either the acquisition of multiple images at the cost of higher radiation dose or significant amounts of computational memory and time. In this work, a simple method of X-ray diffusive dark-field retrieval is presented, applicable to any single-mask imaging setup, with only one exposure of the sample. The approach, which is based on a model of geometric and diffusive reverse-flow conservation, is implicit and non-iterative. This numerically fast methodology is applied to experimental X-ray images acquired using both a random mask and a grid mask, giving high quality reconstructions that are very stable in the presence of noise. The method should be useful for high-speed imaging and/or imaging with low-flux sources.

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