Hi Alex, use the eTIV from the longitudinal subject. In theory, the size of the skull is not changing, and the longitudinal analysis gives you the best estimate of this unchanging number. doug
On 08/06/2013 06:00 PM, Alex Hanganu wrote: > Hello, > > I am measuring the changes of subcortical volumes in a longitudinal > study, so I took the volumes from longitudinal subjects > (/name.long.base/). Now we need to perform the correction using the > eTIV parameter, but the eTIV for longitudinal subjects for all time > points is the same (/i//.e. eTIV for subject-time1.long.base = eTIV > for subject-time2.long.base/) > > Is it correct to perform the correction using the eTIV values from the > longitudinal subjects, or we should use these measures from the > cross-sectional corresponding subjects ? > > Thanks, > > Alex. > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer -- Douglas N. Greve, Ph.D. MGH-NMR Center gr...@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422 Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 www.nmr.mgh.harvard.edu/facility/filedrop/index.html Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ _______________________________________________ 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.
