Metal artifact reduction and image processing of cone-beam computed tomography data for mobile C-arm CT devices [Elektronische Ressource] / Manuel Meilinger

A new method to reduce artifacts (MAR), produced by high-density objects, especially metal implants (MI), in X-ray CBCT is presented. MIs located in the field of view (FOV) result in artifacts influencing clinical diagnostics and treatments. The novel method reduces metal arti-facts by virtually replacing MIs by tissue objects of the same shape. This corrected data can be reconstructed with significantly reduced artifacts. After reconstruc-tion, the segmented 3D MIs were re-inserted into the corrected 3D volume. The method was developed for mobile C-arm CBCTs, where misalignments between original 2D data and forward projections must be ad-justed before correction.While doing research on MAR it became obvious that large MIs were hard to segment. Since a good segmen-tation is a very important prerequisite for an efficient MAR, therefore it was necessary to develop a new seg-mentation technique by combining two thresholding processes with a reconstruction. Manuel MeilingerThese techniques are applied to clinical data and the re-sults are presented.