[Freesurfer] Which is the best volume to use to get intensity statistics?

Hi FS Expert

I have just looked for this subject a long the list but I haven't found anything about.

I have been working with FreeSurfer and I could get some segmentation from my T1 data. I used 'mri_segstats' to quantify volume of some subcortical region. Also I want to get intensity statistics from these regions, so I used --in parameter. In the 'recon-all' pipeline, you use 'norm.mgz' but.. . I wonder is not better to use nu.mgz in order to get intensity values more related to original data? If is not. Can you explain me what '-canorm' step does? Because I don't get it

I'll be grateful if you can help Being all for now, I await a reply

Guido PASCARIELLO Facultad de Ingeniería - Universidad Nacional de Entre Ríos Argentina