TY - CONF A1 - Bircher, B. A1 - Meli, F. A1 - Küng, A. A1 - Bellon, Carsten A1 - Evsevleev, Sergei A1 - Katic, M. A1 - Heikkinen, V. A1 - Hemming, B. A1 - Lassila, A. T1 - Traceable determination of non-static XCT machine geometry: New developments and case studies N2 - It is fundamental to determine the machine geometry accurately for dimensional X-ray computed tomography (XCT) measurements. When performing high-accuracy scans, compensation of a non-static geometry, e.g. due to rotary axis errors or drift, might become necessary. Here we provide an overview of methods to determine and account for such deviations on a per projection basis. They include characterisation of stage error motions, in situ geometry measurements, numerical simulations, and reconstruction-based optimization relying on image quality metrics and will be discussed in terms of their metrological performance. Since a radiographic calibration is always required to provide an initial absolute geometry, this method will be presented as well. The improvements of the XCT geometry correction methods are presented by means of case studies. The methods can be applied individually or in combination and are intended to provide a toolbox for XCT geometry compensation. T2 - 11th Conference on Industrial Computed Tomography (iCT 2022) CY - Online meeting DA - 08.02.2022 KW - Radiographic XCT geometry determination KW - Dimensional metrology KW - traceability KW - XCT machine geometry KW - Calibrated reference standards PY - 2022 SP - 1 EP - 10 PB - Research Group Computed Tomography, Upper Austrian University of Applied Sciences (FH OÖ) CY - Wels, Austria AN - OPUS4-54479 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -