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

History of AFNI updates  

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Daniel Glen
February 11, 2008 01:37PM
I'm not completely sure of what you're trying to accomplish, but if the ROI is an anatomical mask, it will always contain the same number of voxels. You may want to combine that ROI with functional information to count only the voxels within a specific ROI that is at least some threshold value. You can use 3dcalc to create a thresholded mask like this (using a threshold of 0.8):

3dcalc -a func+orig -b mask+orig -prefix roiactive -expr 'step(a-0.8)*step(b)'

Hope this helps.
Subject Author Posted

Volume of voxels in a mask

Carrie January 30, 2008 04:36PM

Re: Volume of voxels in a mask

Daniel Glen January 30, 2008 05:11PM

Re: Volume of voxels in a mask

Carrie February 06, 2008 10:41AM

Re: Volume of voxels in a mask

Daniel Glen February 06, 2008 12:40PM

Re: Volume of voxels in a mask

Ariel Kanevsky February 06, 2008 01:24PM

Re: Volume of voxels in a mask

Carrie February 11, 2008 12:25PM

Re: Volume of voxels in a mask

Daniel Glen February 11, 2008 01:37PM

Re: Volume of voxels in a mask

Carrie February 11, 2008 01:58PM

Re: Volume of voxels in a mask

Daniel Glen February 11, 2008 02:24PM