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Wavelet based multi-scale shape features on arbitrary surfaces for cortical thickness discrimination
Won Hwa Kim · Deepti Pachauri · Charles R Hatt · Moo. K Chung · Sterling C Johnson · Vikas Singh

Mon Dec 03 07:00 PM -- 12:00 AM (PST) @ Harrah’s Special Events Center 2nd Floor

Hypothesis testing on signals defined on surfaces (such as the cortical surface) is a fundamental component of a variety of studies in Neuroscience. The goal here is to identify regions that exhibit changes as a function of the clinical condition under study. As the clinical questions of interest move towards identifying very early signs of diseases, the corresponding statistical differences at the group level invariably become weaker and increasingly hard to identify. Indeed, after a multiple comparisons correction is adopted (to account for correlated statistical tests over all surface points), very few regions may survive. In contrast to hypothesis tests on point-wise measurements, in this paper, we make the case for performing statistical analysis on multi-scale shape descriptors that characterize the local topological context of the signal around each surface vertex. Our descriptors are based on recent results from harmonic analysis, that show how wavelet theory extends to non-Euclidean settings (i.e., irregular weighted graphs). We provide strong evidence that these descriptors successfully pick up group-wise differences, where traditional methods either fail or yield unsatisfactory results. Other than this primary application, we show how the framework allows performing cortical surface smoothing in the native space without mappint to a unit sphere.

Author Information

Won Hwa Kim (University of Wisconsin)
Deepti Pachauri (3M)
Charles R Hatt (University of Wisconsin - Madison)
Moo. K Chung (University of Wisconsin)
Sterling C Johnson (UW-Madison)
Vikas Singh (UW-Madison)

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