SIFT and shape context for feature-based nonlinear registration of thoracic CT images

Authors:
Martin Urschler;Joachim Bauer;Hendrik Ditt;Horst Bischof
Affiliations:
Institute for Computer Graphics & Vision, Graz University of Technology, Austria;VRVis Research Centre, Graz, Austria;Siemens Medical Solutions, CTE PA, Forchheim, Germany;Institute for Computer Graphics & Vision, Graz University of Technology, Austria
Venue:
CVAMIA'06 Proceedings of the Second ECCV international conference on Computer Vision Approaches to Medical Image Analysis
Year:
2006

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Abstract

Nonlinear image registration is a prerequisite for various medical image analysis applications. Many data acquisition protocols suffer from problems due to breathing motion which has to be taken into account for further analysis. Intensity based nonlinear registration is often used to align differing images, however this requires a large computational effort, is sensitive to intensity variations and has problems with matching small structures. In this work a feature-based image registration method is proposed that combines runtime efficiency with good registration accuracy by making use of a fully automatic feature matching and registration approach. The algorithm stages are 3D corner detection, calculation of local (SIFT) and global (Shape Context) 3D descriptors, robust feature matching and calculation of a dense displacement field. An evaluation of the algorithm on seven synthetic and four clinical data sets is presented. The quantitative and qualitative evaluations show lower runtime and superior results when compared to the Demons algorithm.