AFNI Message Board

Dear AFNI users-

We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:

https://discuss.afni.nimh.nih.gov

Existing user accounts have been migrated, so returning users can login by requesting a password reset. New users can create accounts, as well, through a standard account creation process. Please note that these setup emails might initially go to spam folders (esp. for NIH users!), so please check those locations in the beginning.

The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.

Sincerely, AFNI HQ

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Matthew_2
March 09, 2015 12:58PM
Hi AFNI gurus,

I have a question about dilating ROIs/masks.

I'm interested in dilating an roi by a particular *mm* value. 5 mm in particular. Of course functional or other voxels may be not a perfect size for this, but then I imagine some kind of rounding will occur.

I've seen a post here: [afni.nimh.nih.gov]
But the links are broken.

I see that 3dcalc, and 3dautomask, and 3dmasktool have options, but they seem to be 'voxel'-based dilation options, and not mm.

Is the best way to simply use a voxel option, and use a fraction of the voxel size? If so, what if the voxels are not isotropic?

Thank you for any advice,

Matthew
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Subject Author Posted

Dilation of mask / roi by mm

Matthew_2 March 09, 2015 12:58PM

Re: Dilation of mask / roi by mm

Daniel Glen March 09, 2015 01:59PM