Hi Shannon, long_mris_slopes works for surface maps (both thickness and volume should work). In both cases it should compute the temporal average.
I have another scripts that works for stats files (long_stats_slopes) in the same way. How many time points do you have, how far apart (equally spaced?). Best, Martin On Wed, 2012-09-26 at 14:59 -1000, Shannon Kogachi wrote: > 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 _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
