you can use mri_mask for this

cheers Bruce On Tue, 6 Dec 2011, LAOUCHEDI MAKHLOUF wrote:

hi everyone                   i have made an annotation file from somme labels and i want to make a mask from the result (from the annotation file). i mean i want keep just the part of the brain covered by the annotation file in order to transform it by mri_convert to nifti format and make my mask.

thank you for your help