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: alexander.fornito@wh.org.au