register your diffusion data to the anatomical (bbregister), then map the diffusion metric into the anatomical space (mri_vol2vol), then compute the average over the regions you are interested in (eg, mri_segstats --i diff.mgz --seg aparc+aseg.mgz --ctab-default --sum sum.dat)

On 11/3/2022 1:22 PM, Max Korbmacher wrote:

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And perhaps to add, I'm particularly interested in whole-brain grey matter diffusion metrics.
Best,
Max 

Max Korbmacher
PhD student
Western Norway University of Applied Sciences
Bergen, Norway

From: freesurfer-bounces@nmr.mgh.harvard.edu <freesurfer-bounces@nmr.mgh.harvard.edu> on behalf of Max Korbmacher <Max.Korbmacher@hvl.no>
Sent: Thursday, November 3, 2022 5:39:47 PM
To: freesurfer@nmr.mgh.harvard.edu <freesurfer@nmr.mgh.harvard.edu>
Subject: [Freesurfer] Global diffusion metrics
 

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Dear all,

I have been trying a few things to compute global (not regional) average
diffusion metrics.

Is there a function available?

Best,

Max
Max Korbmacher

PhD student
Western Norway University of Applied Sciences
Bergen, Norway

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