To enhance the accuracy of dimensional measurements performed using X-ray computed tomography (CT) systems, a number of influence factors have to be studied, including the system geometry. Geometrical misalignments of X-ray source, rotation axis and X-ray detector may lead to image artefacts in the reconstructed volume and to measurement errors. Starting from the geometrical parameters which were found critical in a previous study, this work investigates how the measurement errors of CT systems with known geometrical misalignments are affected by the influence of the magnification factor and the focal spot size. A simulation campaign was carried out using the geometry of a reference object specifically designed for CT systems testing.

Influence of magnification and focal spot size on measurement errors of X-ray computed tomography systems with known geometrical misalignments

Elia Sbettega
;
Filippo Zanini;Simone Carmignato
2022

Abstract

To enhance the accuracy of dimensional measurements performed using X-ray computed tomography (CT) systems, a number of influence factors have to be studied, including the system geometry. Geometrical misalignments of X-ray source, rotation axis and X-ray detector may lead to image artefacts in the reconstructed volume and to measurement errors. Starting from the geometrical parameters which were found critical in a previous study, this work investigates how the measurement errors of CT systems with known geometrical misalignments are affected by the influence of the magnification factor and the focal spot size. A simulation campaign was carried out using the geometry of a reference object specifically designed for CT systems testing.
2022
Proceedings of the 22nd International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2022
22nd International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2022
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/3471405
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