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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February 17, 2016 11:16AM
Hi Floris, Hi James,

I don't really have any ideas beyond what James
suggests: basically going to a 1 second TR and
censoring everything that does not apply. That
applies to the actual data analysis as well.

Using a 1-second TR would be appropriate to put
the TRs back on a regular grid.


But this is a messy approach. It means there
would be no slice time correction and no outlier
detection. And the regression would need to be
adjusted in a similar way to the -nodata test.

Though since the "TR=1 and censoring" method
would make combining with motion parameters messy,
the actual regression could be set up by first
computing a polort baseline parameter matrix, and
then simply handing it to 3dDeconvolve (and using
-polort -1). That way, 3dDeconvolve would not
have a dependency on temporal continuity.

Note that the motion parameters do not require
temporal continuity, not even for censoring.

- rick
Subject Author Posted

3dDeconvolve with irregular volume acquisition times (sparse sampling)

florisvanvugt February 16, 2016 10:59AM

Re: 3dDeconvolve with irregular volume acquisition times (sparse sampling)

Peter Molfese February 16, 2016 12:31PM

Re: 3dDeconvolve with irregular volume acquisition times (sparse sampling)

florisvanvugt February 17, 2016 09:55AM

Re: 3dDeconvolve with irregular volume acquisition times (sparse sampling)

jkeidel February 17, 2016 10:42AM

Re: 3dDeconvolve with irregular volume acquisition times (sparse sampling)

rick reynolds February 17, 2016 11:16AM