Hi Liang
yes, that information is encoded in the .tif file that is the target of the registration. You can use mrisp_paint to copy a frame out of $FREESURFER_HOME/average/?h.average.curvature.filled.buckner40.tif
the tif file is 3 sets of triplets in different frames. The first is the mean of the measure, the second is the variance and the third is the degrees of freedom. The 3 triplets are for the curvature of the inflated surface, the sulc and mean curvature of the white surface.
cheers Bruce
On Thu, 13 Sep 2012, liang wang wrote:
Dear FS folkers, I am working on a functional probabilistic atlas. I find that some functional regions (particular along a big sulcus) show quite high probability value over a large sample, whereas the probability for some regions are quite lower. I think this disparity could be accounted for by the anatomical variation on each surface node that appears while surface-based registering individual surface to the average template that was provided by Freesurfer. For instance, the anatomical variation could be pretty small within a big sulcus (like central sulcus).
I assume that Freesurfer output a file which characterizes this type of anatomical variation. Could someone point me which file it is and how to use it to create a group-level measure in order to clear display somewhere has large variation. Thanks.
Best, Liang
-- Liang Wang, PhD Neuroscience of Attention and Perception Laboratory Princeton Neuroscience Institute Princeton University Princeton, NJ, 08540