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Conference Paper

Improved statistical power with a sparse shape model in detecting an aging effect in the hippocampus and amygdala

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Kim,  Seung-Goo
Methods and Development Group MEG and EEG - Cortical Networks and Cognitive Functions, MPI for Human Cognitive and Brain Sciences, Max Planck Society;

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Citation

Chung, M. K., Kim, S.-G., Schaefer, S. M., van Reekum, C. M., Peschke-Schmitz, L., Sutterer, M. J., et al. (2014). Improved statistical power with a sparse shape model in detecting an aging effect in the hippocampus and amygdala. In Proceedings of Medical Imaging 2014: Image Processing. The International Society for Optical Engineering.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0018-BD74-3
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.