Dear Freesurfers: We have a large group of subjects (for which we have two time-points) that were run through the recon-all stream using 5.0. We have done no manual editing yet. We would like to do a longitudinal analysis of these subjects using 5.1 by comparing both time-points for each subject. Is that a possibility using 5.1? Also, at what point should I correct for topographical defects, or make edits to the white matter or brain mask volume? Should I edit both time-points separately first and then initiate the longitudinal analysis? If so, could I do the manual editing using 5.1?
thank you very much for your help, cheers, cat
Hi Cat, You'll need to rerun those subjects with 5.1 to be able to use the longitudinal analysis in 5.1.
You can also find a detailed explanation on how to go about edits here: https://surfer.nmr.mgh.harvard.edu/fswiki/LongitudinalEdits
Allison
On Wed, 18 Apr 2012, Cat Chong wrote:
Dear Freesurfers: We have a large group of subjects (for which we have two time-points) that were run through the recon-all stream using 5.0. We have done no manual editing yet. We would like to do a longitudinal analysis of these subjects using 5.1 by comparing both time-points for each subject. Is that a possibility using 5.1? Also, at what point should I correct for topographical defects, or make edits to the white matter or brain mask volume? Should I edit both time-points separately first and then initiate the longitudinal analysis? If so, could I do the manual editing using 5.1?
thank you very much for your help, cheers, cat
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Hi Cat,
you can run 5.1 base and longitudinal on top of 5.0 cross sectional runs. Since you have not edited anything yet, I would however recommend to re-run the cross scectional runs with 5.1
For edits, please look at the wiki page http://surfer.nmr.mgh.harvard.edu/fswiki/LongitudinalEdits also there are examples in the longitudinal tutorial.
Basically : edit the cross, then edit the base, then there should be no need to edit the long. In some cases you may get away with only editing the base.
Best, Martin
----- Original Message ----- From: Cat Chong To: freesurfer@nmr.mgh.harvard.edu Sent: Thursday, April 19, 2012 12:21 AM Subject: [Freesurfer] longitudinal analysis 5.0 or 5.1?
Dear Freesurfers:
We have a large group of subjects (for which we have two time-points) that were run through the recon-all stream using 5.0. We have done no manual editing yet.
We would like to do a longitudinal analysis of these subjects using 5.1 by comparing both time-points for each subject. Is that a possibility using 5.1?
Also, at what point should I correct for topographical defects, or make edits to the white matter or brain mask volume? Should I edit both time-points separately first and then initiate the longitudinal analysis? If so, could I do the manual editing using 5.1?
thank you very much for your help, cheers, cat
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Allison Stevens Player -
Cat Chong -
Martin Reuter