Quantitative Evaluation of Artefact Reduction by an Optimized Specimen Orientation for Metrology Based on Industrial Computed Tomography

Industrial Computed Tomography is used to solve metrological tasks in quality assurance. Although CT has many advantages like complete and non-destructive data acquisition, artefacts can occur depending on the part's material and geometry. Moreover the extent of scanning artefacts strongly depends on the specimen's orientation. By a ray casting approach, the homogeneity of penetration lengths is determined and maximized in order to find the optimal orientation. The reduction of artefacts is assessed by point-based quality metrics. The results show a local contrast improvement of 80 %.