Modified Eulers Elastica Inpainting for Metal Artifact Reduction in CT

Julia Hamer, Bärbel Kratz, Jan Müller, Thorsten M. Buzug


In computed tomography (CT) metal causes strong streak artifacts in the reconstructed images, which may hinder the correct diagnosis of patients. In this work, metal artifacts are reduced using the modified Eulers elastica and curvature based sinogram inpainting (EECSI). The inconsistent data is deleted from the sinogram and replaced by a two-dimensional interpolation strategy based on the surrounding data information using partial differential equations. The inpainting domain is defined by a binary mask that is calculated using a thresholding method in the preliminary reconstructed image with a following forward projection of the metal-only image. Here, the EECSI is modified by a statistic weighting function that regulates the time step size depending on the probability of a gray value. Additionally, the connectivity principle is strengthened by applying a different strategy in the numerical implementation compared to prior methods. The measurements are realized on a Philips Tomoscan M/EG scanner using a torso phantom with the physical properties of an average male torso, suitable for medical experiments. For evaluation, the results are compared to the ones achieved by using the original EECSI and the classically used one-dimensional linear interpolation method. It is demonstrated that the performed modifications result in a better metal artifact suppression.
Original languageEnglish
Title of host publicationBildverarbeitung für die Medizin 2012
EditorsThomas Tolxdorff, Thomas Martin Deserno, Heinz Handels, Hans-Peter Meinzer
Number of pages6
PublisherSpringer Berlin Heidelberg
Publication date16.03.2012
ISBN (Print)978-3-642-28501-1
ISBN (Electronic)978-3-642-28502-8
Publication statusPublished - 16.03.2012
EventWorkshop on Bildverarbeitung fur die Medizin 2012 - Berlin, Germany
Duration: 18.03.201220.03.2012


Dive into the research topics of 'Modified Eulers Elastica Inpainting for Metal Artifact Reduction in CT'. Together they form a unique fingerprint.

Cite this