Thank you for using BrainSuite and very happy to hear that you like it.
The SVReg module computes thickness only for the cortical surface using inner and pial cortical surface representations.
Since the hippocampus and amygdala are subcortical structures, their volumes are not computed, but gray and white matter volumes are reported. The ‘thickness’ computation for hippocampus will involve generating surfaces only for that structure and not the entire brain. We don’t have that functionality implemented.