Hi Luis
if your functional data is mapped onto the surface (i.e. with mri_vol2surf) then it is already on the sphere. All the surfaces for a given subject's hemisphere are topologically equivalent, so you can simply look up the same vertex index on the ?h.sphere (for the metrically optimal spherical coordinate) or the ?h.sphere.reg (for the spherical coordinate that is in register across subjects).
cheers Bruce
On Thu, 7 Jun 2012, Luis R. Piloto wrote:
Hello,
I've specifically adopted Freesurfer for its ability to map a brain into a sphere. I've ran a subject's structural data through the recon-all pipeline using the -all option. With this reconstruction completed, I'd like to overlay functional data on the sphere. More specifically, I'd like the ability to programmatically query a point on the sphere and get the corresponding activation. Is there a reasonable way to do this within the Freesurfer pipeline? I already have the ability to programmatically query my initial functional data, so it would suffice to get a transformation matrix from my structural data to the spherical coordinates. Any thoughts/suggestions would be appreciated.
Regards, Luis Piloto _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer