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
July 10, 2020 02:21PM
In afni_proc.py, blip-up/blip-down distortion correction is computed using unprocessed EPI data (no tshift or anything else). However, it is computed and applied *after* tshift and other initial temporal processing, being applied in the volreg block, along with the rest of the registration transformations.

That allows for the initial temporal processing to retain slice timing, but such that the temporal processing does not affect the distortion computation. Also, it allows for all spatial transformations to be applied in a single, combined transformation, without repeated spatial interpolation.

- rick
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3dTshift and FMC

LuisaBoh July 09, 2020 05:18PM

Re: 3dTshift and FMC

rick reynolds July 10, 2020 02:21PM