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.Pubblicazioni consigliate
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