Abstract
We present an inference algorithm and connected Monte Carlo based estimation procedures for metric estimation from landmark configurations distributed according to the transition distribution of a Riemannian Brownian motion arising from the Large Deformation Diffeomorphic Metric Mapping (LDDMM) metric. The distribution possesses properties similar to the regular Euclidean normal distribution but its transition density is governed by a high-dimensional PDE with no closed-form solution in the nonlinear case. We show how the density can be numerically approximated by Monte Carlo sampling of conditioned Brownian bridges, and we use this to estimate parameters of the LDDMM kernel and thus the metric structure by maximum likelihood.
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Acknowledgements
We are grateful for the use of the cardiac ventricle dataset provided by Jens Chr. Nilsson and Bjørn A. Grønning, Danish Research Centre for Magnetic Resonance (DRCMR).
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Sommer, S., Arnaudon, A., Kuhnel, L., Joshi, S. (2017). Bridge Simulation and Metric Estimation on Landmark Manifolds. In: Cardoso, M., et al. Graphs in Biomedical Image Analysis, Computational Anatomy and Imaging Genetics. GRAIL MICGen MFCA 2017 2017 2017. Lecture Notes in Computer Science(), vol 10551. Springer, Cham. https://doi.org/10.1007/978-3-319-67675-3_8
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