Famous last words, but seems simple enough. Will give it a try. Would just like to clarify what the columns represent in curvature files after converting to ascii: The first volumn is the vertx id. The next three columns are the xyz co-ords. The rightmost column is the actual 'curvature value', e.g., in thickness file, it's the thickness associated with that vertex, in the sulc file, it's the integrated the distnace the node moves during inflation, etc.. In which case, for extracting sulcal and gyral regions separately, I'd need to split vertices based on the sign of the final column in the sulc file.
Another question: are the xyz coords talairach or native coords? They're not surface coords are they? I would've thought surface coords would be in 2D (although I have been known to get it completely wrong form time to time!). Alex Fornito M.Psych/PhD (clin. neuro.) candidate Melbourne Neuropsychiatry Centre and Department of Psychology The University of Melbourne [EMAIL PROTECTED] -----Original Message----- From: Bruce Fischl [mailto:[EMAIL PROTECTED] Sent: Fri 23/12/2005 10:36 AM To: Fornito, Alexander Cc: freesurfer@nmr.mgh.harvard.edu Subject: RE: [Freesurfer] Sulcal depth sure, just sum them separately. Would be easy to do in matlab (we did it in our PNAS thickness paper) On Fri, 23 Dec 2005, Fornito, Alexander wrote: > What it require a lot of work? What would be the odds of somehting like that > happening in the near future? :) > > On another issue, if the .sulc file encodes dinsitguises between sulcal and > gyral regions with positive and negative signs, is it possible to extract the > thickness of sulcal and gyral regions separately? I remember seeing a posting > about this some time ago, bu can't seem to find it again. > > Thanks again. > > Alex Fornito > M.Psych/PhD (clin. neuro.) candidate > Melbourne Neuropsychiatry Centre and Department of Psychology > The University of Melbourne > [EMAIL PROTECTED] > > > > -----Original Message----- > From: Bruce Fischl [mailto:[EMAIL PROTECTED] > Sent: Fri 23/12/2005 9:30 AM > To: Fornito, Alexander > Cc: freesurfer@nmr.mgh.harvard.edu > Subject: Re: [Freesurfer] Sulcal depth > > not all that easily, although I guess we could write out something from > mris_inflate that has the units of mm. > > On Fri, 23 Dec 2005, Fornito, Alexander wrote: > >> Hi all, >>> From my understanding, ?h.sulc can be used to measure sulcal depth. >> I'm wandering if it is possible to use this to get the depth of a sulcus >> within an ROI, and if so, how you would extract the relevant measures, >> i.e.., would it be obtainable through mris_anatomical_stats? >> Thanks, >> Alex >> >> Alex Fornito >> M.Psych/PhD (clin. neuro.) candidate >> Melbourne Neuropsychiatry Centre and Department of Psychology >> The University of Melbourne >> [EMAIL PROTECTED] >> >> ________________________________ >> >> >> _______________________________________________ >> 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
