Processing of projections containing phase contrast in laboratory micro-computerized tomography imaging
Result description
Free-space-propagation-based imaging belongs to several techniques for achieving phase contrast in the hard X-ray range. The basic precondition is to use an X-ray beam with a high degree of coherence. Although the best sources of coherent X-rays are synchrotrons, spatially coherent X-rays emitted from a sufficiently small spot of laboratory microfocus or sub-microfocus sources allow the transfer of some of the modern imaging techniques from synchrotrons to laboratories. Spatially coherent X-rays traverse a sample leading to a phase shift. Beam deflection induced by the local change of refractive index may be expressed as a dark-bright contrast on the edges of the object in an X-ray projection. This phenomenon of edge enhancement leads to an increase inspatial resolution of X-ray projections but may also lead to unpleasant artefacts in computerized tomography unless phase and absorption contributions are separated.
Keywords
phase-contrast imagingX-ray imagingX-ray radiographydigital radiographycomputerized tomographycomputed radiography
The result's identifiers
Result code in IS VaVaI
Result on the web
http://journals.iucr.org/j/issues/2013/04/00/xk5002/xk5002.pdf
DOI - Digital Object Identifier
Alternative languages
Result language
angličtina
Original language name
Processing of projections containing phase contrast in laboratory micro-computerized tomography imaging
Original language description
Free-space-propagation-based imaging belongs to several techniques for achieving phase contrast in the hard X-ray range. The basic precondition is to use an X-ray beam with a high degree of coherence. Although the best sources of coherent X-rays are synchrotrons, spatially coherent X-rays emitted from a sufficiently small spot of laboratory microfocus or sub-microfocus sources allow the transfer of some of the modern imaging techniques from synchrotrons to laboratories. Spatially coherent X-rays traverse a sample leading to a phase shift. Beam deflection induced by the local change of refractive index may be expressed as a dark-bright contrast on the edges of the object in an X-ray projection. This phenomenon of edge enhancement leads to an increase inspatial resolution of X-ray projections but may also lead to unpleasant artefacts in computerized tomography unless phase and absorption contributions are separated.
Czech name
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Czech description
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Classification
Type
Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BM - Solid-state physics and magnetism
OECD FORD branch
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Result continuities
Project
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2013
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Applied Crystallography
ISSN
0021-8898
e-ISSN
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Volume of the periodical
46
Issue of the periodical within the volume
Aug
Country of publishing house
US - UNITED STATES
Number of pages
6
Pages from-to
933-938
UT code for WoS article
000322032300017
EID of the result in the Scopus database
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Basic information
Result type
Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP
BM - Solid-state physics and magnetism
Year of implementation
2013