Coherent superposition in grating-based directional dark-field imaging.

ABSTRACT: X-ray dark-field scatter imaging allows to gain information on the average local direction and anisotropy of micro-structural features in a sample well below the actual detector resolution. For thin samples the morphological interpretation of the signal is straight forward, provided that only one average orientation of sub-pixel features is present in the specimen. For thick samples, however, where the x-ray beam may pass structures of many different orientations and dimensions, this simple assumption in general does not hold and a quantitative description of the resulting directional dark-field signal is required to draw deductions on the morphology. Here we present a description of the signal formation for thick samples with many overlying structures and show its validity in experiment.

SUBMITTER: Malecki A 

PROVIDER: S-EPMC3634061 | biostudies-literature | 2013

REPOSITORIES: biostudies-literature