| ZÁPRAŽNÝ, Z., D. KORYTÁR, Petr MIKULÍK a V. ÁČ. Processing of projections containing phase contrast in laboratory micro-computerized tomography imaging. Journal of Applied Crystallography. Hoboken: WILEY-BLACKWELL, 2013, roč. 46, Aug, s. 933-938. ISSN 0021-8898. Dostupné z: https://dx.doi.org/10.1107/S002188981300558X. |
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@article{1120395,
author = {Zápražný, Z. and Korytár, D. and Mikulík, Petr and Áč, V.},
article_location = {Hoboken},
article_number = {Aug},
doi = {http://dx.doi.org/10.1107/S002188981300558X},
keywords = {phase-contrast imaging; X-ray imaging; X-ray radiography; digital radiography; computerized tomography; computed radiography},
language = {eng},
issn = {0021-8898},
journal = {Journal of Applied Crystallography},
title = {Processing of projections containing phase contrast in laboratory micro-computerized tomography imaging},
url = {http://journals.iucr.org/j/issues/2013/04/00/xk5002/xk5002.pdf},
volume = {46},
year = {2013}
}
TY - JOUR
ID - 1120395
AU - Zápražný, Z. - Korytár, D. - Mikulík, Petr - Áč, V.
PY - 2013
TI - Processing of projections containing phase contrast in laboratory micro-computerized tomography imaging
JF - Journal of Applied Crystallography
VL - 46
IS - Aug
SP - 933-938
EP - 933-938
PB - WILEY-BLACKWELL
SN - 00218898
KW - phase-contrast imaging
KW - X-ray imaging
KW - X-ray radiography
KW - digital radiography
KW - computerized tomography
KW - computed radiography
UR - http://journals.iucr.org/j/issues/2013/04/00/xk5002/xk5002.pdf
L2 - http://journals.iucr.org/j/issues/2013/04/00/xk5002/xk5002.pdf
N2 - 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.
ER -
ZÁPRAŽNÝ, Z., D. KORYTÁR, Petr MIKULÍK a V. ÁČ. Processing of projections containing phase contrast in laboratory micro-computerized tomography imaging. \textit{Journal of Applied Crystallography}. Hoboken: WILEY-BLACKWELL, 2013, roč.~46, Aug, s.~933-938. ISSN~0021-8898. Dostupné z: https://dx.doi.org/10.1107/S002188981300558X.
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