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We present a hierarchical object{based deformable atlas, a promising new approach for the automatic localization and quantitative analysis of neuroanatomy in MR images. The 3D nite element-based elastic atlas combines the advantages of both volumetric{ and surface{ based deformable atlases in one single unifying framework. This multi- resolution framework is not only capable of deforming entire volumes or subvolumes but can deform individual atlas objects, allowing greater and more eective use of object shape and local image feature information. Object surface representations are embedded in the volumetric defor- mable atlas and image-feature-derived forces acting on these surfaces are automatically transferred to the containing 3D nite element lattice. Consequently, spatial relationship constraints of the atlas objects are maintained via the elastic lattice while an object is deformed to match a target boundary. Atlas objects are deformed in a hierarchical fashion, begining with objects exhibiting well-dened image features in the target scan and proceeding to objects with slightly less well-dened features. Experiments involving several subcortical atlas objects are presented.

An object-based volumetric deformable atlas for the improved localization of neuroanatomy in MR images