Correction of the focal spot drifting in X-ray μ-tomography

0450983 - ÚTAM 2016 RIV CZ eng A - Abstrakt
Jandejsek, Ivan - Jakůbek, J. - Kumpová, Ivana - Pichotka, M. - Vavřík, D.
Correction of the focal spot drifting in X-ray μ-tomography.
Conference frontiers in material and life sciences. Creating life in 3D. Book of abstracts. Brno: Central European Institute of Technology, 2015 - (Dettenhofer, M.). s. 83-83. ISBN N.
[Creating life in 3D. Conference on frontiers in materials and life sciences. 02.09.2015-04.09.2015, Brno]
Grant CEP: GA MŠMT(CZ) LO1219
Klíčová slova: X-ray μ-tomography * micro-radiography * focal spot drifting
Kód oboru RIV: AL - Umění, architektura, kulturní dědictví
http://www.ceitec.eu/a5-abstracts-book-3d/f33102

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, a method 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.
Trvalý link: http://hdl.handle.net/11104/0252238