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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bob cox
June 04, 2003 11:24AM
The weighting function can be input by the user of 3dvolreg, using the "-weight" option. However, this is rarely done, it seems. The default weight is a smoothed version of the base dataset (which is explained in the help for 3dvolreg, by the way), which for normal EPI data gives approximately equal weight to all intra-brain voxels and gives lower weight to voxels outside the brain. In particular, values of the default weight that are below 2.5% of the max value in the blurred volume will be set to 0. The blurring is a Gaussian blur with FWHM in all directions being 3 voxels (this blurring is done using FFTs).

bob cox
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Subject Author Posted

3D registration

Marleine June 04, 2003 09:16AM

Re: 3D registration

bob cox June 04, 2003 11:24AM

Re: 3D registration

rob risinger December 01, 2004 12:25PM