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Proceedings Paper

Improved statistical power with a sparse shape model in detecting an aging effect in the hippocampus and amygdala
Author(s): Moo K. Chung; Seung-Goo Kim; Stacey M. Schaefer; Carien M. van Reekum; Lara Peschke-Schmitz; Matthew J. Sutterer; Richard J. Davidson
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Paper Abstract

The sparse regression framework has been widely used in medical image processing and analysis. However, it has been rarely used in anatomical studies. We present a sparse shape modeling framework using the Laplace- Beltrami (LB) eigenfunctions of the underlying shape and show its improvement of statistical power. Tradition- ally, the LB-eigenfunctions are used as a basis for intrinsically representing surface shapes as a form of Fourier descriptors. To reduce high frequency noise, only the first few terms are used in the expansion and higher frequency terms are simply thrown away. However, some lower frequency terms may not necessarily contribute significantly in reconstructing the surfaces. Motivated by this idea, we present a LB-based method to filter out only the significant eigenfunctions by imposing a sparse penalty. For dense anatomical data such as deformation fields on a surface mesh, the sparse regression behaves like a smoothing process, which will reduce the error of incorrectly detecting false negatives. Hence the statistical power improves. The sparse shape model is then applied in investigating the influence of age on amygdala and hippocampus shapes in the normal population. The advantage of the LB sparse framework is demonstrated by showing the increased statistical power.

Paper Details

Date Published: 21 March 2014
PDF: 7 pages
Proc. SPIE 9034, Medical Imaging 2014: Image Processing, 90340Y (21 March 2014); doi: 10.1117/12.2036497
Show Author Affiliations
Moo K. Chung, Univ. of Wisconsin-Madison (United States)
Seung-Goo Kim, Max Planck Institute (Germany)
Stacey M. Schaefer, Univ. of Wisconsin-Madison (United States)
Carien M. van Reekum, The Univ. of Reading (United Kingdom)
Lara Peschke-Schmitz, Univ. of Wisconsin-Madison (United States)
Matthew J. Sutterer, Univ. of Iowa (United States)
Richard J. Davidson, Univ. of Wisconsin-Madison (United States)


Published in SPIE Proceedings Vol. 9034:
Medical Imaging 2014: Image Processing
Sebastien Ourselin; Martin A. Styner, Editor(s)

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