I tried with mris_anatomical_stats from freesurfer-Linux-rh9-v2.1 and I obtained exactly the same result for total surface area as in matlab with the sum of all the triangles, thanks for the advice!
In the mean time I was just wondering how folding index returned by mris_anatomical_stats is calculated? Thank you! Marie Schaer Quoting Doug Greve <[EMAIL PROTECTED]>: > > We found a problem with this computation about a year ago (11/12/2004 to > be specific). I think I sent an email about it to the list. Any releases > prior to that date will have this error in the area computations. Can > you try it with a more recent release? > > > > Marie Schaer wrote: > > >Hello everybody! > > > >I have one question about how surface areas are calculated by > mris_anatomical > >stats (release2004). > >I noticed that the ?h.area file may contain the portion of area > corresponding to > >each different vertex. Actually, the sum of all these areas is around > 7'500mm^2 > >for one hemisphere, which is approximately (but not exactely) the result > given > >by mris_anatomical_stats. However, when I converted the pial surface in > matlab, > >and calculated the sum of the area of each triangle using the following > equation > >http://mathworld.wolfram.com/TriangleArea.html, I obtained a very higher > result > >(~10'000mm^2). Perhaps because the triangles are too big to calculate an > >accurate area at this stage? > > > >So my question was, on which basis is calculated the information contained > in > >lh.area? Does the first row of ?h.area correspond to the piece of area > >attributable to the first vertice, and so on? > > > >Thank you very much for your response! > > > >Marie Schaer > > > > > > > >_______________________________________________ > >Freesurfer mailing list > >Freesurfer@nmr.mgh.harvard.edu > >https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > > > > > > > > > > -- > Douglas N. Greve, Ph.D. > MGH-NMR Center > [EMAIL PROTECTED] > Phone Number: 617-724-2358 > Fax: 617-726-7422 > > _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
