Correction of the focal spot drifting in X-ray ?-tomography
Result description
Nowadays micro-focus X-ray tubes in conjunction with digital pixelated imagers are standardly utilized for micro-radiography; radiogram resolution can be even better than one micrometer with high projection magnification. The same requirement for computed tomography (CT) is not easy to fulfill due to time-dependent focal spot position drifting and tube thermal deformations. These effects can be significant especially for longtime measurement, which is necessary for high quality micro-CT. In this work, amethod for correction of this effect is proposed. The method is based on the regular recording of an object zero position throughout the tomographic sequence. A shift of the object between those images caused by the focal spot drifting is measured employing an image correlation technique. Obtained knowledge of the shift is included into calculations of the final reconstruction. A distinct improvement in reconstruction results is shown in the case of plastic composites.
Keywords
computed tomographyspot driftingdDigital image correlation (DIC)
The result's identifiers
Result code in IS VaVaI
Alternative codes found
RIV/68378297:_____/15:00450983
Result on the web
DOI - Digital Object Identifier
—
Alternative languages
Result language
angličtina
Original language name
Correction of the focal spot drifting in X-ray ?-tomography
Original language description
Nowadays micro-focus X-ray tubes in conjunction with digital pixelated imagers are standardly utilized for micro-radiography; radiogram resolution can be even better than one micrometer with high projection magnification. The same requirement for computed tomography (CT) is not easy to fulfill due to time-dependent focal spot position drifting and tube thermal deformations. These effects can be significant especially for longtime measurement, which is necessary for high quality micro-CT. In this work, amethod for correction of this effect is proposed. The method is based on the regular recording of an object zero position throughout the tomographic sequence. A shift of the object between those images caused by the focal spot drifting is measured employing an image correlation technique. Obtained knowledge of the shift is included into calculations of the final reconstruction. A distinct improvement in reconstruction results is shown in the case of plastic composites.
Czech name
—
Czech description
—
Classification
Type
O - Miscellaneous
CEP classification
JJ - Other materials
OECD FORD branch
—
Result continuities
Project
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Basic information
Result type
O - Miscellaneous
CEP
JJ - Other materials
Year of implementation
2015