[Freesurfer] Brainsuite --> FreeSurfer

Hi, I've done a segmentation with Brainsuite ( and FreeSurfer) and I would like to get measurements with FreeSurfer. SO, I convert my rile ( readdfs --> write_surf ) from BRainsuite in Matlab to be usable with Freesurfer. Then, I tried to get measurements with the command .'mris_anatomical_stats' . with the file created previously in Matlab (I called it 'rh.pial'). But I got this error like the system is not able to read wm.mgz.That's why I thought I could juste replace th 'rh.pial' of the segmentation with Freesurfey by the 'rh.pial' created with Matalb and then run mris_anatomical_Stats. IS this a good approximation. Could you recommand another way.

VP