title: Wavelet based multi-scale shape features onarbitrarysurfaces for cortical thickness discrimination.
abstract: 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 identifyingveryearly 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.
authors.affiliation: Dept. of Computer Sciences, University of Wisconsin, Madison, WI ; Wisconsin Alzheimer's Disease Research Center, University of Wisconsin, Madison, WI ; GRECC, William S. Middleton VA Hospital, Madison, WI.
authors.forename: Won Hwa
authors.initials: WH
authors.lastname: Kim
authors.affiliation: Dept. of Computer Sciences, University of Wisconsin, Madison, WI.
authors.forename: Deepti
authors.initials: D
authors.lastname: Pachauri
authors.affiliation: Dept. of Biomedical Engineering, University of Wisconsin, Madison, WI.
authors.forename: Charles
authors.initials: C
authors.lastname: Hatt
authors.affiliation: Dept. of Biostatistics & Med. Informatics, University of Wisconsin, Madison, WI.
authors.forename: Moo K
authors.initials: MK
authors.lastname: Chung
authors.affiliation: Wisconsin Alzheimer's Disease Research Center, University of Wisconsin, Madison, WI ; GRECC, William S. Middleton VA Hospital, Madison, WI.
authors.forename: Sterling C
authors.initials: SC
authors.lastname: Johnson
authors.affiliation: Dept. of Computer Sciences, University of Wisconsin, Madison, WI ; Dept. of Biostatistics & Med. Informatics, University of Wisconsin, Madison, WI ; Wisconsin Alzheimer's Disease Research Center, University of Wisconsin, Madison, WI ; GRECC, William S. Middleton VA Hospital, Madison, WI.
authors.forename: Vikas
authors.initials: V
authors.lastname: Singh