On 03/16/2014 06:07 PM, Narly Golestani wrote:
Dear all,
Related to the bug that was reported in 2011 (see http://www.mail-archive.com/freesurfer%40nmr.mgh.harvard.edu/msg19821.html) with the way that surface-based volumes and areas were calculated in Freesurfer versions 5.1 and earlier, I’d like to confirm that region-of-interest measures obtained using those earlier versions (e.g. when exporting the volume / surface area to tables using aparcstats2table) were unaffected by this bug (i.e. rerunning qcache should not change ROI-based results).
Correct, the aparcstats2table values are unaffected.
- I’d like to also confirm that otherwise, for vertex-based analyses,
it should be sufficient to run ‘recon-all subject –qcache’ using a more recent version of freesurfer in order to obtain accurate measures for data that was originally processed using 'recon-all –all' with an earlier version of freesurfer (I have data that was originally processed with version 4.4 and other data that was processed with version 5.1 that I would like to now examine in a surface-based manner).
Yes, that works fine.
- The bug was related to how the measures were converted to standard
space - I’d like to therefore confirm that when doing surface/vertex-based analyses, it is not necessary to use total brain volume as a covariate (whereas it is for ROI-based analyses).
This question has nothing to do with the bug. People generally use ICV or total brain volume when exploring cortical volume or surface area, but it is inappropriate for thicknss studies doug
Many thanks, and all the best,
Narly.
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