you can use mri_label2vol to sample the aparc+aseg.mgz into the functional space, then run mri_segstats on it to give the number of functional voxels in each label. Or you can just look at the volume of each label and divide by the volume of your functional voxel.

raij@nmr.mgh.harvard.edu wrote:

Dear FreeSurfers,

Is there a way to estimate the number of fMRI voxels that intersect with the FreeSurfer anatomical inflated surface space? -"- for a given surface label?

We need this as N for calculations of statistical significances (to correct for the oversampling of the orginal 3D voxel space by very densely spaced vertex points on the surface).

For this purpose, the voxel size was 3.125 x 3.125 x 4.4 mm, the FOV covered the entire brain, and the anatomical brain is "fsaverage".

Thanks!

-Tommi

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Tommi Raij, M.D., Ph.D. MGH/MIT/HMS Athinoula A. Martinos Center for Biomedical Imaging Bldg 149, 13th St Charlestown, MA 02129 U.S.A. _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer