Processing of projections containing phase contrast in
laboratory micro-computerized tomography imaging

J 2013

Processing of projections containing phase contrast in laboratory micro-computerized tomography imaging

ZÁPRAŽNÝ, Z., D. KORYTÁR, Petr MIKULÍK a V. ÁČ

Základní údaje

Originální název

Processing of projections containing phase contrast in laboratory micro-computerized tomography imaging

Autoři

ZÁPRAŽNÝ, Z. (703 Slovensko), D. KORYTÁR (703 Slovensko), Petr MIKULÍK (203 Česká republika, garant, domácí) a V. ÁČ (703 Slovensko)

Vydání

Journal of Applied Crystallography, Hoboken, WILEY-BLACKWELL, 2013, 0021-8898

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10302 Condensed matter physics

Stát vydavatele

Spojené státy

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 3.950

Kód RIV

RIV/00216224:14740/13:00069093

Organizační jednotka

Středoevropský technologický institut

DOI

http://dx.doi.org/10.1107/S002188981300558X

UT WoS

000322032300017

Klíčová slova anglicky

phase-contrast imaging; X-ray imaging; X-ray radiography; digital radiography; computerized tomography; computed radiography

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 10. 4. 2014 09:37, Olga Křížová

Anotace

V originále

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.

Návaznosti

ED1.1.00/02.0068, projekt VaV

Název: CEITEC - central european institute of technology

Citovat

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.

@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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