Topology preserving atlas construction from shape data without correspondence using sparse parameters.

Stanley Durrleman (1, 2) , Marcel Prastawa (3) , Julie R Korenberg (4) , Sarang Joshi (3) , Alain Trouvé (5) , Guido Gerig (3)

1 ASCLEPIOS - Analysis and Simulation of Biomedical Images
2 NEMESIS-CRICM - Equipe NEMESIS - Centre de Recherches de l'Institut du Cerveau et de la Moelle épinière
3 SCI Institute - Scientific Computing and Imaging Institute
4 University of Utah
5 CMLA - Centre de Mathématiques et de Leurs Applications

Statistical analysis of shapes, performed by constructing an atlas composed of an average model of shapes within a population and associated deformation maps, is a fundamental aspect of medical imaging studies. Usual methods for constructing a shape atlas require point correspondences across subjects, which are difficult in practice. By contrast, methods based on currents do not require correspondence. However, existing atlas construction methods using currents suffer from two limitations. First, the template current is not in the form of a topologically correct mesh, which makes direct analysis on shapes difficult. Second, the deformations are parametrized by vectors at the same location as the normals of the template current which often provides a parametrization that is more dense than required. In this paper, we propose a novel method for constructing shape atlases using currents where topology of the template is preserved and deformation parameters are optimized independently of the shape parameters. We use an L1-type prior that enables us to adaptively compute sparse and low dimensional parameterization of deformations. We show an application of our method for comparing anatomical shapes of patients with Down's syndrome and healthy controls, where the sparse parametrization of diffeomorphisms decreases the parameter dimension by one order of magnitude.

Domaines: Imagerie médicale

Stanley Durrleman, Marcel Prastawa, Julie R Korenberg, Sarang Joshi, Alain Trouvé, et al.. Topology preserving atlas construction from shape data without correspondence using sparse parameters.. MICCAI - Medical Image Computing And Computer Assisted Intervention, Oct 2012, Nice, France. pp.223-230, ⟨10.1007/978-3-642-33454-2_28⟩. ⟨hal-00818415⟩