Magnified x-ray phase imaging using asymmetric Bragg reflection: Experiment and theory

Journal Article · Tue Aug 01 04:00:00 EDT 2006 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.74.054107· OSTI ID:20853479

Modregger, Peter; Schaefer, Peter; Koehler, Rolf ^[1]; Luebbert, Daniel ^[2]

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1. Institut fuer Physik, Humboldt-Universitaet zu Berlin, Newtonstr. 15, D-12489 Berlin (Germany)
2. Institut fuer Synchrotronstrahlung, Forschungszentrum Karlsruhe, D-76344 Eggenstein-Leopoldshafen (Germany)

X-ray imaging using asymmetric Bragg reflection in the hard x-ray regime opens the way to improve the spatial resolution limit below 1 {mu}m by magnifying the image before detection, simultaneously providing a strong phase contrast. A theoretical formalism of the imaging process is established. Based on this algorithm, numerical simulations are performed and demonstrate that both Fresnel propagation and Bragg diffraction contribute to contrast formation. The achievable resolution of this technique is investigated theoretically; the results obtained can be used to improve future experimental setups. Furthermore, the minimum detectable phase gradient is estimated, for comparison with other phase sensitive imaging techniques. Results from biological objects demonstrate that the technique is viable for imaging both in two and three dimensions. Refraction contrast images are extracted from experimental projection images by an algorithm similar to diffraction-enhanced imaging (DEI), and used to achieve three-dimensional tomographic reconstruction.

• OSTI ID: 20853479
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 5 Vol. 74; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALGORITHMS
ASYMMETRY
BRAGG REFLECTION
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
DIFFRACTION
HARD X RADIATION
IMAGE PROCESSING
IMAGES
OPTICS
REFRACTION
SPATIAL RESOLUTION
THREE-DIMENSIONAL CALCULATIONS
TOMOGRAPHY