116 research outputs found
Lagrangian and Eulerian biventricular strains from anatomical NURBS models using tagged MRI
No full textAnalysis Of 4-D Cardiac Mr Data With Nurbs Deformable Models: Temporal Fitting Strategy And Nonrigid Registration
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Diffeomorphic Directly Manipulated Free-Form Deformation Image Registration via Vector Field Flows
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Explicit B-spline regularization in diffeomorphic image registration
No full textDiffeomorphic mappings are central to image registration due largely to their topological properties and success in providing biologically plausible solutions to deformation and morphological estimation problems. Popular diffeomorphic image registration algorithms include those characterized by time-varying and constant velocity fields, and symmetrical considerations. Prior information in the form of regularization is used to enforce transform plausibility taking the form of physics-based constraints or through some approximation thereof, e.g. Gaussian smoothing of the vector fields (a la Thirion's Demons citep{thirion1998}). In the context of the original Demons' framework, the so-called {it directly manipulated free-form deformation} citep{tustison2009} can be viewed as a smoothing alternative in which explicit regularization is achieved through fast B-spline approximation. This characterization can be used to provide B-spline ``flavored'' diffeomorphic image registration solutions with several advantages. Implementation is open source and available through the Insight Toolkit and our Advanced Normalization Tools (ANTs) repository. A thorough comparative evaluation with the well-known SyN algorithm citep{avants2008}, implemented within the same framework, and its B-spline analog is performed using open labeled brain data and open source evaluation tools
Comparison of parallel and spiral tagged MRI geometries in estimation of 3-D myocardial strains
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