Dear all, For the evaluation of the subcortical volumes we executed ‘mri_segstats’ on ‘aseg.mgz’ and for comparison on ‘aparc+aseg.mgz’ in a number of individuals. Apparently the volume of subcortical structures, like the hippocampus, is calculated as the same values if calculated (without partial volume correction) from ‘aseg.mgz’ and ‘aparc+aseg.mgz’. However, when partial volume correction is applied, the resulting values for e.g. hippocampal volumes differ between the ‘mri_segstats’ calculation for ‘aseg.mgz’ and ‘aparc+aseg.mgz’. How could those differences resulting from the partial volume correction in these cases be explained?
The command used to calculate the subcortical volumes with partial volume correction was: mri_segstats --seg ./mri/aparc+aseg.mgz --ctab $FREESURFER_HOME/FreeSurferColorLUT.txt --excludeid 0 --sum ./stats/my.test.stats --pv ./mri/norm.mgz Previously we have been using the subcortical volumes from ‘aseg.stats’, which, as I understand it, is generated by recon-all from ‘aseg.mgz’ via ‘mri_segstats’ (with partial volume correction). From your experience, would it be also valid to use subcortical volumes generated by applying ‘mri_segstats’ (with partial volume correction) on ‘aparc+aseg.mgz’, even though the resulting values might differ from the values in aseg.stats? Thank you very much in advance, Steffi Schreiber _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
