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Boundary-based registration of diffusion data to the Freesurfer surface. The movable b0 image is registered to the T1 surface represented by the pial (green lines) and white matter surface (red lines), by maximizing contrast between grey matter and white matter in the movable (b0) image (Greve and Fischl, 2009). This registration is then applied to fractional anisotropy (FA) data and sampled at each vertex of the white matter surface (red dots).
