Hi,

I have some volume ROIs in diffusion space (1-s and 0-s). I would like to obtain, for example, the average FA values in that ROI.

I tried using mri_segstats, but it gives me an error, it needs a segmentation volume.
mri_segstats --i dmri/dtifit_FA.nii.gz --mask FSL_waypoint2Hipplh.unc_AS_avg33_mni_bbrlh_headHPC/thres_mask5.nii.gz --sum fa.stats

If I substitute --i for --seg I obtain a different error.

Which command should I use? I tried dmri_pathstats but it is asking for the file length.samples.txt, which I don't have and don't know how to generate.

thanks!
Gari