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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Claudio Gentili
June 29, 2009 07:10AM
Hi guys,
I have a question regarding volume registration.
We are interested to analyze fMRI data with a new tecnique that is a sort of nonparametric spectral estimation. We have noticed that the volume correction step (3dvolreg -maxite 35 -dfile mov.out -prefix final epi+orig) lead to different results in spectral estimation as compared to the raw data in which the max displacement is of 0.7 mm (so we think it is pretty small). Our fMRI data consists of 4 slices acquired with a TR of 300 ms for ten minutes and the voxel size is 3.75x3.75x5mm . These differences could be related to the interpolation schemes, or to the volume correction per se? In your opinion, does make sense to avoid motion correction if the displacement is "small"?
thank you,
claudio
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volreg

Claudio Gentili June 29, 2009 07:10AM

Re: volreg

bob cox June 29, 2009 11:32AM