Hi Freesurfers,

I want to do group analysis on four groups and use the volume values in aseg,stats.

1- Is it correct that each subcortical segmentation is based on a "volumetric segmentation atlas" created by Freesurfer?

2- Are the volume values expressed in the space of this atlas?

3- Can I compare these absolute values between 4 groups ?

4- Should I apply correction to the volume measures by eTIV (also called ICV)?

Thanks you in advance!

Best regards,

Hengameh