I wonder if any tool is already capable to dilate a volume carrying atlas labels, where unmarked voxels within X mm receive label matching the label of the nearest "non-void" voxel?

my motivation: some volumes were skull stripped tiny bit too aggressively by FSL's bet on highres anatomical -- as a result some border voxels after nearestneighbor reslicing of the sri24 atlas into the BOLD space lack labeling.  Obvious somewhat non-scientific approach I thought of is to dilate label map but so that labels information propagates  to the closest unoccupied voxels if multiple labels start to compete.

P.S. meanwhile I will just research on better parameters for bet to make it less aggressive ;-)