Abstract #3035

Sparse re-parametrization of continuous Fibre Orientation Distributions using spherical harmonic delta functions

Robert Elton Smith¹ and Alan Connelly^1,2

¹The Florey Institute of Neuroscience and Mental Health, Melbourne, Australia, ²The University of Melbourne, Melbourne, Australia

Constrained Spherical Deconvolution (CSD) estimates the Fibre Orientation Distribution (FOD) in each voxel in the Spherical Harmonic (SH) basis. Although features of the underlying fibre configuration are captured within the FOD, the SH basis is not wholly appropriate for their analysis. We propose a re-parametrization of the FOD, fitting a sparse set of SH delta functions to each FOD, that additionally captures the anisotropic dispersion of each discrete fibre bundle.

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