Hi Itamar,

fsaverage3/4 are just different icosahedral supersamplings. They were actually used to create fsaverage (which you can think of as fsaverage7).

That is, fsaverage1 has 12 vertices, fsaverage2 42, etc..., and the first 12 of fsaverage[234567] are the ones from fsaverage1, the first 42 in fsaverage[34567] are the ones from fsaverage2, etc...

cheers Bruce

On Wed, 26 Mar 2014, Itamar Kahn wrote:

Greetings,

We would like to downsample surfaces (e.g. using mris_decimate) but we want to duplicate the way it was done with fsaverage (namely, find out how fsaverage3/4/5 were created from the original fsaverage). Also, we wish to be able to project using mri_surf2surf but we don’t have sphere registration available (these are fetal imaging surfaces).

Thanks, Itamar

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Itamar Kahn, Ph. D., Assistant Professor Department of Physiology and Biophysics The Ruth and Bruce Rappaport Faculty of Medicine Technion – Israel Institute of Technology POB 9649 Bat Galim Haifa 31096 Israel

(o) 972-4-829-5461 http://kahnlab.technion.ac.il/ _________________________________________________

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