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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September 26, 2014 10:48AM
I'm fairly sure that it's the double interpolation happening in @auto_tlrc. You can try the -onewarp option on your data to see if that helps.

-onewarp          : Create follower data with one interpolation
				  step, instead of two. 
				  This option reduces blurring of the output data.
				  It is not used by default for backward
				  compatibility.

My very quick test:
original epi:
4.34745  4.33357  4.0353
adwarp:
4.96608  4.67872  4.63067
@auto_tlrc:
3.99983  3.82253  3.88686
@auto_tlrc onewarp:
4.84429  4.51512  4.62035

Also, consider adding the -detrend option to your 3dFWHMx command.



Edited 2 time(s). Last edit at 09/26/2014 10:50AM by Peter Molfese.
Subject Author Posted

why "@auto_tlrc" reduce spatial smoothness?

Zhihao_Li September 26, 2014 10:02AM

Re: why "@auto_tlrc" reduce spatial smoothness?

Peter Molfese September 26, 2014 10:48AM

Re: why "@auto_tlrc" reduce spatial smoothness?

Zhihao_Li September 26, 2014 11:02AM