afni.nimh.nih.gov

Let's say I've got a blob marking a certain region of the brain. It's a dataset consisting of 1's inside the blob and 0's elsewhere. Now I want to dilate it, expand it to include all neighboring voxels, perhaps multiple times. Kind of like the -dilate option in 3dAutomask, but without the automask part. Is there a command for this?
-Jed