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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December 12, 2014 04:56PM
Hi Rick,

These miniscule/small movements are not a problem at all. I'm just curious how 3dvolreg finds them when the grid is 2.5 x 2.5 x 2.5. Does it only use the edges of the phantom, or does it make use of the "structural" information (there are wires inside it) inside the phantom as well when performing the registration? If it uses structural information inside the phantom, why can a 40 guage wire moving .005mm be detected when together they still have not moved a full voxel width?

~michael
Subject Author Posted

movement much less than voxel size ?

michael tobia December 12, 2014 02:43PM

Re: movement much less than voxel size ?

rick reynolds December 12, 2014 04:15PM

Re: movement much less than voxel size ?

michael tobia December 12, 2014 04:56PM

Re: movement much less than voxel size ?

rick reynolds December 13, 2014 09:33PM

Re: movement much less than voxel size ?

michael tobia December 15, 2014 08:37AM

Re: movement much less than voxel size ?

rick reynolds December 15, 2014 09:52AM

Re: movement much less than voxel size ?

michael tobia December 16, 2014 05:58AM