There are a lot of things you mention (vbm, pet, surface-based, and dti). You'll have to explain in more detail what you did.

On 03/14/2016 01:10 PM, John Anderson wrote:

Hi Doug, I ran voxel based analysis in FSL to check the differnce in PET signal between two groups. The results are totally differnt than surface based analysis in Freesurfer. I this real or I am doing something wrong? I tried to do the same but using FA maps and also I got totally differnt results. I have special interest in understanding why these two methods leads to differnt results?! I have read this refernce http://cds.ismrm.org/protected/11MProceedings/files/ISMRM2011-8410.pdf and actually I was unable to reach the point that can explain this differnce in th results. I highly appreciate if you clarify that to me. Bests, John

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