Hi Tom, we write out an ?h.area file that contains the area of every vertex in the tessellation (the average area of all triangles it is a member of). You should be able to convert it to ascii using mris_convert in the usual way.
Also, note that the vertex index is invariant across the different surface representations, including flattened, so you can always relate data across them. As far as getting used to looking at the flatmaps, it takes a little bit of time, but it's not that bad. Probably the best thing to do is run two copies of tksurfer, one with the inflated and one with the flattened surfaces, and use send and goto point to see how they are related. cheers, Bruce On Fri, 7 Jun 2002, Tom Schoenemann wrote: > Is there any way to get a measure of absolute surface area of, e.g., the > pial surface of an individual? If so, can this be run on cut portions > of the cortical surface (e.g., the occipical pole)? We worked our way to > the point at which freesurfer has created a model of the surface of each > hemisphere. We are beginning to experiment with cuts as a prelude to > flattening. We would like to make comparisons between individuals in > the size and distribution of surface area across the cortex. > > Also, it isn't clear from the guide how easy it would be to interpret > the flattened cortex map. That is, how do we know which part of the map > corresponds to which part of the cortex, just by looking at the map > itself. Is the flattened map presented in some standardized perspective? > > Apologies if we have overlooked this in the guide and/or tutorial! > > -Tom > _________________________________________________ > P. Thomas Schoenemann > Assistant Professor > Department of Anthropology > University of Pennsylvania > Philadelphia, PA 19104-6398 > > Phone: (215) 573-7671 > Fax: (215) 898-7462 > E-mail: [EMAIL PROTECTED] > Homepage: http://www.sas.upenn.edu/~ptschoen/ >
