[Freesurfer] freesurfer data analysis and visualization

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anyone have suggestion data visualization from freesurfer volumetric. i need visualization of 2 volume before and after of the same individual patient and between 2 groups in a research. i've found some paper use pysurfer, anyone have other suggestions and tutorioal / reading and code about how to use those ?

best regards

*Pukovisa Prawiroharjo, M.D., Sp.N, Subsp. NGD (K), PhD* Neurobehavior Consultant, Neurology Specialist Neurology Department, Faculty of Medicine, Universitas Indonesia Chair of Bioethics Cluster IMERI UI Chair of International Policy Div, Board of Development Med Services IDI