I ran into a problem skull stripping and after removing bottom/neck slices,
recentering the image and playing with the -f and -g options, I still get a
bit of skull at the top. I'd like to manual remove this using an exclusive
mask of the unwanted skull bits. avwmaths -mas is an inclusive masking. Is
there a way to do the reverse of this? I tried using -sub, but it only
excludes the outer background part of my mask and leaves in the skull part.
Any suggestions short of manually drawing the brain for all 130 slices?
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