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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Brian
November 03, 2005 04:18PM
Hi AFNI users,

I am interested in "constricting" an ROI mask (single blob). There was a previous post on dilating a blob mask with:

3dcalc -a mask+orig \
-b a+i -c a-i -d a+j -e a-j -f a+k -g a-k \
-expr 'or(a,b,c,d,e,f,g)' -prefix maskplus -nscale

Is there a corresponding, presumably related, 3dcalc command to constrict the ROI?

My goal is to constrict white matter segmentation masks to improve partial voluming before applying the masks to fractional anisotropy data (from AFNI!).

Thanks for your time and help.
Brian

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Subject Author Posted

Constricting a mask dataset

Brian November 03, 2005 04:18PM

Re: Constricting a mask dataset

bob cox November 03, 2005 04:52PM

Re: Constricting a mask dataset

Daniel Glen November 03, 2005 04:58PM

Re: Constricting a mask dataset

Brian November 03, 2005 05:14PM