*From:* freesurfer-boun...@nmr.mgh.harvard.edu
on behalf of Zeng, Qi
*Sent:* Saturday, August 20, 2022 8:33 AM
*To:* Freesurfer support list
*Subject:* Re: [Freesurfer] primary diffusion direction & surface
normal vector
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on behalf of Zeng, Qi mailto:qi.z...@icahn.mssm.edu>>
Sent: Friday, August 19, 2022 1:55 PM
To: Freesurfer support list
mailto:freesurfer@nmr.mgh.harvard.edu>>
Subject: [Freesurfer] primary diffusion direction & surface normal vector
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Hi Freesur
] primary diffusion direction & surface normal vector
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Hi Freesurfer experts,
After DTI tensor fitting, usually we obtain primary, secondary, and tertiary
eigenvectors (V1, V2, V3) and eigenvalues (L1, L2, L3). So what do we use to
describe the pri
