[Freesurfer] Improving the brainmask.mgz using aseg.mgz for getting rid of dura

Hi, My goal is to use the best possible skull-stripped version of the input MRI. Is brainmask.mgz the one? or I was wondering if anyone has tried improving the brainmask.mgz further by masking it out using the aseg.mgz. Will that help with regards to getting rid of the dura in the brainmask.mgz. My intuition is because the generation of aseg.mgz includes a surface-based algorithm, the smoothing constraints of the surface evolution should minimize the "leakage" of the GM surface into the dura, hence the aseg might have some dura but not as much as the brainmask. Will be thankful for any suggestions/comments. Karteek