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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rick reynolds
February 17, 2009 09:54AM
Hi Jayna,

Another possibility would be to decide on a y coordinate that
cuts off anterior from posterior. Then you could zero out
any part of the mask where the y value is too large.

E.g. to zero voxel with y greater than 12 (making this up):

3dcalc -a mask+tlrc -expr 'a*ispositive(12.1-y) -prefix ant.mask

That uses the y coordinate (assuming an RAI oriented dataset,
where positive y means posterior) to mask the original values.

See 3dcalc -help for more examples (such as #7).

- rick

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Subject Author Posted

Anatomical Mask

Jayna Amting February 15, 2009 12:49PM

Re: Anatomical Mask

Daniel Glen February 15, 2009 01:22PM

Re: Anatomical Mask

rick reynolds February 17, 2009 09:54AM