Please use this identifier to cite or link to this item: https://doi.org/10.1007/978-3-642-22092-0_22
Title: Approximations of the diffeomorphic metric and their applications in shape learning
Authors: Yang, X. 
Goh, A. 
Qiu, A. 
Keywords: diffeomorphic metric
exponential map
hippocampal shape
ISOMAP
Issue Date: 2011
Source: Yang, X.,Goh, A.,Qiu, A. (2011). Approximations of the diffeomorphic metric and their applications in shape learning. Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 6801 LNCS : 257-270. ScholarBank@NUS Repository. https://doi.org/10.1007/978-3-642-22092-0_22
Abstract: In neuroimaging studies based on anatomical shapes, it is well-known that the dimensionality of the shape information is much higher than the number of subjects available. A major challenge in shape analysis is to develop a dimensionality reduction approach that is able to efficiently characterize anatomical variations in a low-dimensional space. For this, there is a need to characterize shape variations among individuals for N given subjects. Therefore, one would need to calculate (2 N) mappings between any two shapes and obtain their distance matrix. In this paper, we propose a method that reduces the computational burden to N mappings. This is made possible by making use of the first- and second-order approximations of the metric distance between two brain structural shapes in a diffeomorphic metric space. We directly derive these approximations based on the so-called conservation law of momentum, i.e., the diffeomorphic transformation acting on anatomical shapes along the geodesic is completely determined by its velocity at the origin of a fixed template. This allows for estimating morphological variation of two shapes through the first- and second-order approximations of the initial velocity in the tangent space of the diffeomorphisms at the template. We also introduce an alternative representation of these approximations through the initial momentum, i.e., a linear transformation of the initial velocity, and provide a simple computational algorithm for the matrix of the diffeomorphic metric. We employ this algorithm to compute the distance matrix of hippocampal shapes among an aging population used in a dimensionality reduction analysis, namely, ISOMAP. Our results demonstrate that the first- and second-order approximations are sufficient to characterize shape variations when compared to the diffeomorphic metric constructed through (2 N) mappings in ISOMAP analysis. © 2011 Springer-Verlag.
Source Title: Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
URI: http://scholarbank.nus.edu.sg/handle/10635/88232
ISBN: 9783642220913
ISSN: 03029743
DOI: 10.1007/978-3-642-22092-0_22
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