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