A Universal Moire Effect and Application in X-Ray Phase-Contrast Imaging.

ABSTRACT: A moiré pattern is created by superimposing two black-and-white or gray-scale patterns of regular geometry, such as two sets of evenly spaced lines. We observed an analogous effect between two transparent phase masks in a light beam which occurs at a distance. This phase moiré effect and the classic moiré effect are shown to be the two ends of a continuous spectrum. The phase moiré effect allows the detection of sub-resolution intensity or phase patterns with a transparent screen. When applied to x-ray imaging, it enables a polychromatic far-field interferometer (PFI) without absorption gratings. X-ray interferometry can non-invasively detect refractive index variations inside an object^1-10. Current bench-top interferometers operate in the near field with limitations in sensitiv

SUBMITTER: Miao H 

PROVIDER: S-EPMC5063246 | biostudies-literature | 2016

REPOSITORIES: biostudies-literature