[Freesurfer] The feasibility of this procedure

Dear FS, I want to do an analysis with freesurfer but this is relatively complicated. I would like to know whether this is doable by freesurfer. I first want to create a custom template based on my subjects and I have seen the SurfaceRegAndTemplate page and this should be the place where I should start. Then I should use mris_register to register all my subjects to the new template. Then I want to export volume data of each region of interest and total intracranial volume of subjects to SPSS for further analysis and I don't have a clue on how to do that yet. Do you think this is feasible? Any problems there? Thanks for any help in advance. Miao

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