Great, thanks. On another issue, I've noticed that using mris_convert to convert ?h.area to ascii produces the same area values in the resulting file, irrepsective of whether pial or white surfaces are specified in the command. This contrasts mris_anatomical_stats, which gives different values. Is it possible to extract pial and white surface area separately for sulcal and gyral regions? Thanks again, Alex Alex Fornito M.Psych/PhD (clin. neuro.) candidate Melbourne Neuropsychiatry Centre and Department of Psychology The University of Melbourne [EMAIL PROTECTED]
________________________________ From: Bruce Fischl [mailto:[EMAIL PROTECTED] Sent: Thu 5/01/2006 12:42 AM To: Fornito, Alexander Cc: freesurfer@nmr.mgh.harvard.edu Subject: RE: [Freesurfer] .sulc in tksurfer yes, that makes sense. On Wed, 4 Jan 2006, Fornito, Alexander wrote: > Hi Bruce, > I'm trying to extract thickness for sulci and gyri separately. From what I > understand, positive .sulc values suggest sulci and negative .sulc values > suggest gyri. I'd like to play around with this distinction (e.g., call > everything with a .sulc value < .35 'gyral'), and am wandering if adjusting > the midpoint in tksurfer allows me to precisly visualize what changing this > threshold does. Basically, I'd like to know if it's correct for me to pick a > midpoint I'm happy with in tksurfer, say .35, than go back and split the > .thickness file into vertices with .sulc values above and below .35, knowing > that this distinction between sulcal and gyral will correspond to the one > shown by the colour display I visualized in tksurfer. > > I'm pretty sure the values in the tksurfer threshold midpoint scale > correspond to those in the curvature file, since they seem to change depednig > on the curvature file loaded (e.g., the range for .sulc files is different to > the range for .thickness files). Just want to double-check. > Hope this makes sense, > Alex > > > > the threshold midpoint in the curvature display just sets where the > transition is from red to green (or light gray to dark gray if using > binary colors) > > On Wed, 4 Jan 2006, Fornito, Alexander wrote: > >> Hi, >> Does the 'threshold midpoint' value in tksurfer's curvature display control >> correspond to values in the .sulc file (assuming the .sulc file is loaded), >> or are they arbitrary values? For example, if I set the value to .50, does >> this make all vertices with a .sulc value of .50 or less lighter (lighter, >> if using binary colouring)? >> 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
