ROI extraction through CAT12

Dear Brainstorm,

I am looking a way to extract ROI values, based on AAL3 template through CAT12.
Is it feasible after segmenting processing on Brainstorm?

I did find [subjectimage_aal3_reg_volatlas.mat] file after running the process... but can't figure out how to do it. The tutorial page does not seem to contain the information..

Thank you very much in advance

Use a volume source model, and load the atlas as volume scouts.
https://neuroimage.usc.edu/brainstorm/Tutorials/TutVolSource#Volume_atlases