TY - JOUR A1 - Illerhaus, Bernhard A1 - Staude, Andreas A1 - Meinel, Dietmar T1 - Nondestructive insights into composition of the sculpture of Egyptian Queen Nefertiti with CT and the dependence of object surface from image processing JF - The e-journal of nondestructive testing & ultrasonics N2 - Precautions in the generation of surfaces from CT images should be the rule. Two different data sets of the bust of Nefertiti and additional data from an industrial CT scanner will show the conflicts that arise when defining a surface. The recent trend in CT is to extract surfaces from CT measurements which can compete with the accuracy of tactile measurements. As CT is complicated by artefacts, a lot of precautions need to be taken in order to get exact results. More errors are introduced, if the surface of an object made from different dense materials is calculated. A publication in April 2009 of "Radiology" dealt with the surface of the stone behind the stucco layer of the famous bust of the Egyptian Queen Nefertiti in the Ägytische Museum Berlin. Using this data, we will show the different problems that arise from inadequate image processing. Furthermore, a detailed comparison of the two CT measurements made 14 years apart is given. Conclusions: Respect the traps in virtual imaging. KW - Image processing (computer-assisted) KW - Computed X ray tomography KW - Artifacts KW - Implants KW - Computertomographie KW - Oberfläche KW - Oberflächenbestimmung PY - 2009 UR - https://www.ndt.net/search/docs.php3?id=8043 SN - 1435-4934 VL - 14 IS - 9 SP - 1 EP - 11 PB - NDT.net CY - Kirchwald AN - OPUS4-20840 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -