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231224s2013 xx ||||| 00| ||eng c |
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|a (NLM)24046501
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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|a Zápražný, Zdenko
|e verfasserin
|4 aut
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|a Processing of projections containing phase contrast in laboratory micro-computerized tomography imaging
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|c 2013
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|a Text
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|a Band
|b nc
|2 rdacarrier
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|a Date Revised 21.10.2021
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a 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 in spatial resolution of X-ray projections but may also lead to unpleasant artefacts in computerized tomography unless phase and absorption contributions are separated. The possibilities of processing X-ray images of lightweight objects containing phase contrast using phase-retrieval methods in laboratory conditions are tested and the results obtained are presented. For this purpose, simulated and recorded X-ray projections taken from a laboratory imaging system with a microfocus X-ray source and a high-resolution CCD camera were processed and a qualitative comparison of results was made
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|a Journal Article
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|a X-ray imaging
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|a X-ray radiography
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|a computed radiography
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|a computerized tomography
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|a digital radiography
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|a phase-contrast imaging
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|a Korytár, Dušan
|e verfasserin
|4 aut
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|a Mikulík, Petr
|e verfasserin
|4 aut
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| 700 |
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|a Ač, Vladimír
|e verfasserin
|4 aut
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|i Enthalten in
|t Journal of applied crystallography
|d 1998
|g 46(2013), Pt 4 vom: 01. Aug., Seite 933-938
|w (DE-627)NLM098121561
|x 0021-8898
|7 nnns
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| 773 |
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|g volume:46
|g year:2013
|g number:Pt 4
|g day:01
|g month:08
|g pages:933-938
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|d 46
|j 2013
|e Pt 4
|b 01
|c 08
|h 933-938
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