you can sample under the wm surface by using negative proj fracts or proj dists doug
On 09/03/2013 09:32 AM, Robert Schulz wrote:
Dear Freesurfers, I transferred the white matter binary mask (derived from aseg, volume) to FSL and performed probabilistic tractography in it. Now I'd like to project the 'outer' white matter results (vol) onto the white surface. To test for the acuracy of this approach, I tried to project the white matter mask (binarized, volume) itself on the surface, proper projection should give only 1s (ones) on the surface, which holds true for the majority of vertices. I used the following command: mri_vol2surf --mov whitevolume.mgz --reg struct2freesurfer.dat --projdist-max 0 3 0.1 --interp nearest --hemi rh --out ... Is there a way to optimize this? The binarized white matter data (volume) is just below the white matter surface in most cases, sometimes, voxels are also above the surface. If I try trilinear I get values far away from 1 (hence values which are not included in the primary data (=binarized mask). Looking forward to your suggestions. Thank you very much, Best Robert
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