Sorry, got it wrong way around. Either way, when I run mris_anatomical_stats on labels that I have created, I tend to get positive values for mean curvature for labels of both gyral crowns or sulcal fundi. Are the curvature values provided by mris_anatomical_stats unsigned?
Alex Fornito M.Psych/PhD (clin. neuro.) candidate Melbourne Neuropsychiatry Centre and Department of Psychology National Neuroscience Facility The University of Melbourne Levels 2 & 3, Alan Gilbert Building 161 Barry St Carlton South Vic 3053 Australia Ph: +61 3 8344 1624 Fax: +61 3 9348 0469 email: [EMAIL PROTECTED] -----Original Message----- From: Bruce Fischl [mailto:[EMAIL PROTECTED] Sent: Thu 5/25/2006 9:09 PM To: Fornito, Alexander Cc: freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] ROI Curvature Hi Alex, the gyri will should have negative mean curvature and the sulci positive. You can overlay the ?h.curv map to check. cheers, Bruce On Thu, 25 May 2006, Fornito, Alexander wrote: > Hi, > I have some labels that I've drawn, which correspond to the gyral crown and > sulcal fundus of a given ROI. From what I understand, mean curvature provides > an index of the convexity/concavity of the region. I would therefore have > expected high positive values in the gyral ROI to represent a steeper peak in > the curvature of the crown, with values closed to zero representing a more > flattened gyrus. Converseley, I would have thought low negative values for > the fundus ROI would represent a steeper peak in the opposite direction, with > values closer to zero again reflecting flattened curvature. > In reality, the values I get for both sulcal and gyral labels (using > mris_anatomical_stats) tend to be both positive. > Hoping someone could tell me what I'm missing? > > Thanks in advance, > Alex > > > > > Alex Fornito > M.Psych/PhD (clin. neuro.) candidate > Melbourne Neuropsychiatry Centre and Department of Psychology > National Neuroscience Facility > The University of Melbourne > Levels 2 & 3, Alan Gilbert Building > 161 Barry St > Carlton South Vic 3053 Australia > Ph: +61 3 8344 1624 > Fax: +61 3 9348 0469 > email: [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
