Hello experts, I am doing volumetric studies where I am comparing the subcortical structures volumes among different experimental groups. I usually do two mprages on one subject in a single scan at two time-points. I run recon all on both mprages for a single subjects. To my surprise the volumes of same structure of a single subject calculated by freesurfer using two mprages are different.
I did longitudinal run using the two mprages from same subject, however then also the volumes show differences. May you please advise me what to do. Thanks, Rashmi
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