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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pmlauro
August 16, 2017 03:09PM
Hello AFNI friends -

I've been using auto_warp.py/3dQwarp quite a bit lately for both subject->atlas and within-subject (2 separate timepoints) registration, and I'm a big fan. I have some questions about the output however -

1) In the anat.un.aff.qw_WARP.nii volume, what do the voxel values in each sub-brick (x_delta, y_delta, z_delta) refer to? Is it an arbitrary 'shift' value, or does it refer to a displacement in millimeters (or other units)? I've tried looking for an answer, and I can't seem to find it.

2) In the anat.un.aff.nii_WarpDrive.log file, what do the RMS and ITER values refer to? I initially thought the RMS was a 'goodness-of-fit' measure, but I don't think that's the case...

Thank you!
Pete
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Subject Author Posted

Two 3dQwarp questions

pmlauro August 16, 2017 03:09PM

Re: Two 3dQwarp questions

rick reynolds August 17, 2017 12:24PM

Re: Two 3dQwarp questions

pmlauro August 18, 2017 01:43PM