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Geometric adjustment methods to improve reconstruction quality on rotational cone-beam systems

: Reisinger, S.; Schmitt, M.; Voland, V.

Kastner, J. ; FH Oberösterreich, Wels; Österreichische Gesellschaft für zerstörungsfreie Prüfung -ÖGZfP-; Deutsche Gesellschaft für Zerstörungsfreie Prüfung e.V. -DGZfP-, Berlin; Schweizerische Gesellschaft für Zerstörungsfreie Prüfung; Deutsche Gesellschaft für Materialkunde -DGM-, Arbeitskreis Tomografie:
Conference on Industrial Computed Tomography, ICT 2012 : Sessions: Non-destructive testing and 3D materials characterisation, dimensional measurement, poster session; proceedings; 19th - 21th September 2012
Aachen: Shaker, 2012 (Messtechnik und Sensorik)
ISBN: 978-3-8440-1281-1
Conference on Industrial Computed Tomography (ICT) <3, 2012, Wels>
Fraunhofer IIS ()

Reconstruction algorithms require precise knowledge about the scan geometry of the computed tomography (CT) system. This is not always present. The scan geometry can be described considerably by the spatial relation between the X-ray source, the detector and the centre of rotation as shown in Figure 1. Stationary CT systems, where the source and detector are fixed with respect to each other, are generally precisely aligned. In contrast CT systems with flexible source and/or detector position can only be aligned retardant and within limited accuracy. The scan geometry can be afflicted with geometrical instabilities, caused by a moving focal spot and/or a misaligned or unknown position of the centre of rotation. Even slight differences between assumed and actual scan geometry can lead to significant artefacts in the reconstructed image. Within this contribution, we present a referenceless method for estimating a subset of the geometrical parameters of a CT system in order to use this information to improve the quality of the reconstructed image.