yes. Surface area will be the affected much more than thickness (and volume of course scales with area)
On Fri, 22 Mar 2013, _andre...@sapo.pt wrote: > Hi Bruce, > > Thank you for the quick response! > > In the meanwhile, does that also apply to cortical thickness and volume? > > Thank you! > > Andreia > > Quoting Bruce Fischl <fis...@nmr.mgh.harvard.edu>: > >> Hi Andreia >> >> the issue is that the BA labels contain every point that has any non-zero >> probability (no matter how small!) of being in that label. So the total >> label area is almost certainly always bigger than the actual BA. Anastasia >> has some scripts for automatically computing the correct threshold, and I >> believe she and Nick integrated them into 5.2 so that the stats are >> computed both thresholded and unthresholded, hopefully they can comment. >> Bruce >> >> >> >> On Fri, 22 Mar 2013, _andre...@sapo.pt >> wrote: >> >>> Hi all, >>> >>> I'm using FS 5.0 and some time ago I was told by Bruce that I had to >>> threshold the BA in order to have an approximate area when overlaying >>> in the inflated surface. To get surface area values I also need to use >>> the label_area and put a threshold >>> having the possibility to choose the surface that I want, either white >>> or pial. >>> >>> But I can also get the BA stats in a table for all subjects and areas >>> using either mris_anatomical_stats (on each label) or usinga script by >>> Jamaan to get the table (since I already have the ?.BA.stats files), >>> right? >>> >>> My question is, which is the better/correct way to get the thickness >>> and surface area values of the BA to export for statistical analysis >>> since there are the thresolds issue. >>> >>> I want to study mainly cortical thickness and surface area but also >>> look also at the volume (which is surface-based, thus >>> thickness*surface are will not be = volume since they are an average >>> from each label, right?). >>> >>> I' not sure of which approach to follow now... Does it depend on the >>> measure I'll be using? >>> >>> Thank you! >>> >>> Andreia >>> >>> >>> _______________________________________________ >>> Freesurfer mailing list >>> Freesurfer@nmr.mgh.harvard.edu >>> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer >>> >>> >>> >> _______________________________________________ >> 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. > > > _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
