Won Hwa Kim

Wavelet Based Multi-scale Shape Features on Arbitrary Surfaces

for Cortical Thickness Discrimination


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.

Fig. Normalized log scale p-values after FDR correction at q = 10e−5, projected back on a brain mesh and displayed. Row 1: Original cortical thickness, Row 2: SPHARM, Row 3: Wavelet Multiscale descriptor.


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This research is supported by NIH R01AG040396, NIH R01AG021155, NSF RI1116584, NSF RI1252725, the Wisconsin Partnership Proposal, UW ADRC, and UW ICTR (1UL1RR025011).


1. Won Hwa Kim, Deepti Pachauri, Charles Hatt, Moo K. Chung, Sterling C. Johnson, Vikas Singh, "Wavelet Based Multi-scale Shape Features on Arbitrary Surfaces for Cortical Thickness Discrimination", Advances in Neural Information Processing Systems (NIPS), 2012.
2. Won Hwa Kim, Vikas Singh, Moo K. Chung, Chris Hinrichs, Deepti Pachauri, Ozioma C. Okonkwo, Sterling C. Johnson, "Multi-resolutional shape features via non-Euclidean wavelets: Applications to statistical analysis of cortical thickness", NeuroImage, 2014.