see: http://surfer.nmr.mgh.harvard.edu/fswiki/eTIV
also note that mri_segstats is easier to use for getting etiv. nick On Wed, 2009-10-14 at 14:22 -0500, Guang Zeng wrote: > Hi, there, > > From FS Wiki, eTIV - estimated Total Intracranial Volume, aka ICV, > > I read > > mri_label_volume requires specifying the transform file to use, and > the scale factor: > mri_label_volume -eTIV \ > $sdir/transforms/talairach.xfm 1948 \ > $sdir/aseg.mgz 17 53 > > where $sdir is the path to the subject's mri directory (ie, > $SUBJECTS_DIR/<subjid>/mri). The '17' and '53' are label ID's, in this > case left and right hippocampus (see the subjects /stats/aseg.stats > file for IDs). The output will look like: > > using eTIV from atlas transform of 1528 cm^3 > processing label 17... > 3822 voxels (3822.0 mm^3) in label 17, %0.250119 of eTIV volume (1528075) > processing label 53... > 4410 voxels (4410.0 mm^3) in label 53, %0.288598 of eTIV volume (1528075) > From a previous post at FS mailing list, I also read something > similar, > Just as an aside, once you have a talairach_with_skull.lta file (whether > from v3 or v4), you can calculate eTIV as scale_factor/determinant(lta), > where the scale_factor employed is 2150. > > Just want to know where dose this scale factor number 1948 and 2150 > come from? > > > Thanks a lot! > > Guang > > > > > ______________________________________________________________________ > Hotmail: Free, trusted and rich email service. Get it now. > _______________________________________________ > 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
