Hello to the folks at Freesurfer,

I'm just getting started with your tools and am finding them very useful. Thanks for the great work. 

I am trying to register my functional images to freesurfer surfaces in order to overlay SPM T maps. I have pre-processed and co-registered my functional images to the brain volume using SPM, where I also ran functional analyses. I followed the instructions on the web for using spmregister. Doing so produces a register.dat file that seems to work well for overlaying my T maps onto the white, orig, and pial surfaces, but not the inflated surfaces. When attempting to register to the inflated surface using tkregister, I get the error "ERROR: vertex 0 (14.6911,-132.739,-34.1424) is out of range (113,162,-5)". When I attempt to overlay onto the inflated surface in freeview, the locations are not remotely correct (usually invisible, within the inflated surface).

I think that freesurfer is basically doing a volumetric registration which is why it has trouble with the inflated surface, which is mostly outside of the brain. Whereas I think the desired method would be to co-register a given functional/statistical volume to the freesurfer orig volume, and then take advantage of links between orig and all surfaces created from it. 

Does anybody know of a way to achieve this linking between an arbitrary volume and all surfaces? Or of another workaround to plot SPM T-maps on the subject's inflated surface? 

Thanks for any help.

cheers

Nick

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Nicholas Blauch, B.S.

Lab Manager 

Computational Memory and Perception Laboratory

Department of Psychological and Brain Sciences

University of Massachusetts, Amherst