Affiliation: | a ICG, Institute for Computer Graphics and Vision, Graz University of Technology, Inffeldgasse 16 2.OG, A-8010 Graz, Austria b Department of Radiology, Medical University of Vienna, Währinger Gürtel 18-20, A-1090 Vienna, Austria c Pattern Recognition and Image Processing Group, Vienna University of Technology, Favoritenstr. 9, A-1040 Vienna, Austria |