HI Antonio, You can use mris_convert to get the surfaces into ascii format. ie: mris_convert lh.white lh.white.ascii If you look at the file you see the following:
#!ascii version of lh.white 126302 252600 -7.101086 -100.000061 -1.796945 0 -7.231718 -99.740860 -1.915022 0 . . -7.355780 53.003563 -9.506091 0 0 1 2 0 3 2 1 0 . . 120678 121091 121102 0 122524 122217 122525 0 The first line is a comment. The second line lists the number of points and then the number of polygons. The next 126302 lines (number of points) list the x y z co-ordinates of that point. The last 252600 lines (number of polygons) list the points that make up that polygon. hope that helps, mishkin On Thu, Feb 21, 2008 at 1:48 PM, Gallo, Antonio (NIH/NINDS) [F] <[EMAIL PROTECTED]> wrote: > Dear all, > > We are trying to extract a cerebral white matter mask from the > Freesurfer output. > We are currently using the aparc+aseg file in order > to do this, however we realized that the white matter mask (taken by > choosing the voxels with values equal to 2 and 41) doesn't correspond > exactly to the white matter we would like to have, which rather would > follow the WM boundary obtained with the surface processing. > Is there a way to get a more accurate mask that corresponds to these > boundaries? > Also, is there a description of the file format that the surface files > are written in? > > Thank you, > > Antonio > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
