Can I transform a surface-based volume back into its corresponding surface rendering using the transformation matrix used to create the surface-based volume to begin with? I'm using Freesurfer to register individual statistics generated by FSL onto the surface-map of an average brain, and then transforming these maps into mni305.cor.mgz space. At this point, I now have individual statistical surface maps in MNI space that have the benefit of Freesurfer's surface-based registration. From these MNI maps, I conducted a group analysis with FSL, resulting in a group zstat map I would like to transform back onto the average brain surface-map that I initially used to register the individuals.
So basically, I need help transforming a volume in mni305.cor.gz space back onto its surface-based map. I was thinking of running mri_vol2surf, but I would need a register.dat file that contained the exact inverse parameters to go from surf->mni305. I could use tkregister2 to create a serviceable register.dat, but I'm certain that a perfect transformation is necessary for these surface-mapped volumes.
How would I create this register.dat from mni305->surf, or is there a more direct way to accomplish this?
Thanks, Eric
Eric Moulton PhD Research Fellow P.A.I.N. Group Brain Imaging Center McLean Hospital 115 Mill Street Belmont, MA 02478 Phone: 617-855-2475 Fax: 617-855-3772
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