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Hi, You can dilate any mask using the -dilF option in fslmaths. Run it twice (or more) if you want extra dilation. All the best, Mark On 19 Feb 2014, at 18:57, SUBSCRIBE FSL Calvin Santiago <[log in to unmask]> wrote: > Hello Jesper, > > Thanks for your insight. Prior to these steps in the processing, I have run an in-house code to mask out the lesions (albeit conservatively). Is there a way to dilate these masks to the extra 1-2 voxel border you speak of? > > I believe fslmaths can do this, but I'm not sure how. > > Thanks again, > Calvin