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Measurement of the X-ray computed tomography instrument geometry by minimization of reprojection errors - implementation on experimental data
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SYSNO ASEP 0492800 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Measurement of the X-ray computed tomography instrument geometry by minimization of reprojection errors - implementation on experimental data Author(s) Ferrucci, M. (BE)
Heřmánek, P. (IT)
Ametova, E. (BE)
Sbettega, E. (IT)
Vopálenský, Michal (UTAM-F) RID, ORCID, SAI
Kumpová, Ivana (UTAM-F) RID, SAI, ORCID
Vavřík, Daniel (UTAM-F) RID, SAI, ORCID
Carmignato, S. (IT)
Craeghs, T. (BE)
Dewulf, W. (BE)Number of authors 10 Source Title Precision Engineering : Journal of the International Societies for Precision Engineering and Nanotechnology. - : Elsevier - ISSN 0141-6359
Roč. 54, October (2018), s. 107-117Number of pages 11 s. Publication form Print - P Language eng - English Country NL - Netherlands Keywords X-ray computed tomography ; dimensional metrology ; instrument alignment Subject RIV JB - Sensors, Measurment, Regulation OECD category Electrical and electronic engineering R&D Projects LO1219 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) UT WOS 000452579900012 EID SCOPUS 85047641667 DOI 10.1016/j.precisioneng.2018.05.007 Annotation A procedure for measuring the geometry of X-ray computed tomography (CT) instruments is applied to an experimental CT instrument. In this study, the geometrical measurement procedure is implemented with the CT2 reference object, comprising steel spheres with known center positions in a local coordinate frame affixed to a cylindrical carbon fiber framework. The procedure can be implemented with other sphere-based reference objects, provided the sphere center coordinates are known. The effects of number of acquired projections and rotation mode (stepped or continuous) on the quality of measured geometrical parameters are studied. Finally, the output of the geometrical measurement procedure is used to inform the physical adjustment of the experimental CT instrument to its ideal alignment. The effectiveness of the measurement procedure to correctly determine the instrument geometry is demonstrated from dimensional measurements performed on a tomographically reconstructed validation object from radiographs acquired under initial (misaligned) and adjusted (aligned) instrument geometry. Workplace Institute of Theoretical and Applied Mechanics Contact Kulawiecová Kateřina, kulawiecova@itam.cas.cz, Tel.: 225 443 285 Year of Publishing 2019
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