Computing Large Deformation Metric Mappings via Geodesic Flows of Diffeomorphisms |
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Authors: | Beg M Faisal Miller Michael I Trouvé Alain Younes Laurent |
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Affiliation: | 1. Center for Imaging Science & Department of Biomedical Engineering, The Johns Hopkins University, 301 Clark Hall, Baltimore, MD, 21218, USA 2. Center for Imaging Science, department of Biomedical Engineering, Department of Electrical and Computer Engineering and The Department of Computer Science, Whiting School of Engineering, The Johns Hopkins University, 301 Clark Hall, Baltimore, MD, 21218, USA 3. LAGA, Université Paris, France 4. CMLA, Ecole Normale Supérieure de Cachan, 61, Avenue du President Wilson, F-94 235, Cachan CEDEX, France
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Abstract: | This paper examine the Euler-Lagrange equations for the solution of the large deformation diffeomorphic metric mapping problem studied in Dupuis et al. (1998) and Trouvé (1995) in which two images I
0, I
1 are given and connected via the diffeomorphic change of coordinates I
0○ϕ−1=I
1 where ϕ=Φ1 is the end point at t= 1 of curve Φ
t
, t∈0, 1] satisfying .Φ
t
=v
t (Φ
t
), t∈ 0,1] with Φ0=id. The variational problem takes the form
where ‖v
t‖
V
is an appropriate Sobolev norm on the velocity field v
t(·), and the second term enforces matching of the images with ‖·‖L
2 representing the squared-error norm.In this paper we derive the Euler-Lagrange equations characterizing the minimizing vector fields v
t, t∈0, 1] assuming sufficient smoothness of the norm to guarantee existence of solutions in the space of diffeomorphisms. We describe the implementation of the Euler equations using semi-lagrangian method of computing particle flows and show the solutions for various examples. As well, we compute the metric distance on several anatomical configurations as measured by ∫0
1‖v
t‖
V
dt on the geodesic shortest paths. |
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Keywords: | Computational Anatomy Euler-Lagrange Equation Variational Optimization Deformable Template Metrics |
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