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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bob cox
September 19, 2003 03:56PM
You're not fired yet, Ziad. It is indeed possible that you (Brianna) are getting significant ringing (DFT) artifacts from the Fourier method, especially if the image FOV is nearly tight around the head (so that wraparound might occur).

In addition to viewing the images in movie form (e.g., by holding down an arrow on the "Time Index" control), you could also compute the mean volume (used 3dTstat) and then subtract it from the registered time series (using 3dcalc). The difference images in the two cases (Fourier and heptic) would show where the two results differ. 3dTstat could also be used to compute the standard deviation of the registered results, and again see where they differ.

bob cox
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Subject Author Posted

3dvolreg - surprising results?!?

Brianna September 19, 2003 02:12PM

Re: 3dvolreg - surprising results?!?

Ziad September 19, 2003 03:29PM

Re: 3dvolreg - surprising results?!?

bob cox September 19, 2003 03:56PM