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Abstract #1398

NEX or No NEX? a High Angular Resolution Diffusion Imaging Study

Maxime Descoteaux1, Nicolas Wiest-Daessl2, Sylvain Prima2, Christian Barillot2, Rachid Deriche3, Cyril Poupon1

1NeuroSpin, IFR 49, CEA Saclay, Gif-sur-Yvette, France; 2VISAGES Projet, INRIA, Rennes, France; 3Odyssee Projet, INRIA, Sophia Antipolis, France

The need for multiple NEX and averaging along each diffusion gradient direction is shown to be unnecessary. This can significantly reduce acquisition time. We show that a proper filtering of the diffusion measurements correcting the Rician noise bias can increase the quality and coherence of HARDI reconstructions and anisotropy maps while preserving the angular resolution of the reconstruction method.