On the origins of decoherence and extinction contrast in phase-contrast imaging
| Autor: | Ya. I. Nesterets |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Physics
Quantum decoherence business.industry Phase-contrast imaging X-ray optics Iterative reconstruction Linear shift invariant Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Optics Tomography Electrical and Electronic Engineering Physical and Theoretical Chemistry business Phase retrieval Coherence (physics) |
| Zdroj: | Optics Communications. 281:533-542 |
| ISSN: | 0030-4018 |
| DOI: | 10.1016/j.optcom.2007.10.025 |
| Popis: | A theoretical formalism describing the formation of images in a linear shift invariant X-ray optical system is derived within the wave-optical theory. It is applicable to a non-crystalline object consisting of two types of features, with the characteristic sizes which are respectively not smaller and much smaller than the resolution of the imaging system. This formalism is then applied to two phase-contrast imaging techniques, the propagation-based and analyser-based imaging. The obtained formulae for the intensity distribution in the image well explain the “decoherence effect” which is observed in the former technique and the “extinction contrast” which is a characteristic of the latter technique. This formalism is shown to be in good agreement with the results of the accurate numerical simulations, using rigorous wave-optical theory, of the propagation-based and analyser-based phase-contrast images of the model objects. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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