[Freesurfer] Generating a 'non-zero' group mask

Dear all,

I am performing surface analyses on ASL CBF maps. As these maps do not cover the whole brain, and some masks have larger brain coverage than others, I would need to create a binary surface mask (in the fsaverage space) which would zero out the vertices where at least one of my subjects have a zero value. This map would then be used to spatially limit my statistical analyses in mri_glmfit.

Any suggestions?

Thanks a lot,

Marco

_____________________

Marco L. Loggia, PhD

Postdoctoral Fellow, Mass General Hospital & Brigham and Women's Hospital

Harvard Medical School

CNY Building 120, suite 101E

Charlestown, Massachusetts 02129

Phone: (617) 643-7267

Fax: (617) 643-7340 marco@nmr.mgh.harvard.edu