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Comparison of Two 3D Automatic Landmarking Methods For a Large Training Set of Cardiac MR Images

By MJA Siers, Frangi Af, MR Kaus, WJ Niessen and Zaragoza Spain


Active Shape Models (ASM) offer the possibility to include prior shape knowledge into a statistical shape model. However, the widespread introduction of ASM in 3D medical image analysis is hampered by the need for determining a large collection of corresponding landmarks in a series of images, which is a tedious procedure. In this paper, two different methods for 3D automatic landmarking which were recently introduced by the authors are compared for obtaining an ASM from a large training set of segmented cardiac MR images. The first method uses a volumetric free form deformation to map the landmarks from an atlas to each individual shape. The second method obtains corresponding landmarks by adapting a triangular mesh to the binary images. Compactness and generalizibility results are given for the models that are constructed with both methods, showing that a considerable dimension reduction and small reconstruction error are obtained in both cases

Year: 2007
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