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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October 22, 2020 02:12PM
Hi Rebecca,

The maximum (preferably censored) motion displacement is a consideration for potential distortion differences, assuming a fixed shim at the beginning of a scanning run. The shim corrects distortion, but as the subject moves, the distortion changes.

The maximum displacement is the largest displacement between *any* pair of volumes (probably not including censored volumes).

For example, in AFNI_demos/AFNI_pamenc/AFNI_02_pamenc/global_process_commands.txt, we used gen_ss_review_table.py to drop subjects having a maximum censored displacement greater than 8 ~mm.

Does that seem reasonable?

- rick
Subject Author Posted

Max Motion Displacement Question

Carvalho October 19, 2020 04:23PM

Re: Max Motion Displacement Question

rick reynolds October 22, 2020 02:12PM

Re: Max Motion Displacement Question

Carvalho October 22, 2020 06:23PM

Re: Max Motion Displacement Question

rick reynolds October 23, 2020 03:47PM