Hi Martin, When I used the long_mris_slopes command for the thickness, the average thickness calculated in FreeSurfer was pretty similar to averaging the values in FreeSurfer. Does this command only work thickness measures and not for volume or area? Thanks!
-Shannon On Wed, Sep 26, 2012 at 2:49 PM, Martin Reuter <mreu...@nmr.mgh.harvard.edu>wrote: > Hi Shannon > > You probably mean average thickness. > My scripts compute the temporal average from the linear fit (at mid time), > which can be differed from simply averaging values. > Best Martin > > Shannon Kogachi <skoga...@gmail.com> wrote: >> >> Hi, >> I had a question about how the temporal average is calculated for >> subjects with multiple timepoints. I used the long_mris_slopes command on a >> longitudinal set of data. However, when I compared the average volumes >> calculated through this command to the average volumes calculated in excel >> after extracting the same vertices at the individual timepoints, these >> values did not match up. The average volumes calculated through >> long_mris_slopes were smaller. Please let me know if there is a way to >> explain this discrepancy. Thank you! >> >> -Shannon K. >> >> ------------------------------ >> >> Freesurfer mailing list >> Freesurfer@nmr.mgh.harvard.edu >> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer >> >> > -- > Sent from my phone, please excuse brevity. > > 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. > -- Shannon Kogachi Clinical Research Coordinator Neuroscience and MRI Research Program Department of Medicine JABSOM, University of Hawaii 1356 Lusitana Street, 7th Floor Honolulu, HI 96813 (808) 691 - 8763
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