Empty voxels upon joint smoothing

Support
1

Dear all,
We have brain samples that we segment using a seeding/grow from seeds approach followed by a joint smoothing. This last step results in a couple of empty voxels as you can see on the picture below:

image
image778×567 72 KB

the red circles some of these empty voxels. is there a way to fill them randomly by one adjacent segment ?
thanks for your help and thoughts
s

2

Probably running Grow from seeds would work (if those are the only unlabled ones in the segmentation)