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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May 15, 2015 08:55PM
Hi Christine,

Though you may have answered it, I will just try
to clarify a bit.

Note that the +orig blur size of 4.7 mm is basically
the size of a voxel, generally plus a little bit
since the scanners tend to do just a little blurring,
too (that varies).

Then the data was resampled to standard space, which
increased the blur from 4.7 to 5.8 because of the
interpolation step in resampling. Then you added a
4 mm blur, which impressively increased the blur
estimation by exactly that, 4 mm.

So yes, use 9.8 mm in AlphaSim.

Note that it would be more precise not to oversample
the data when going to standard space. It might be
better to leave the voxels as 4 mm, 3.9 mm, or maybe
as low as 3.5 mm (which afni_proc.py would do).


Regarding your search, the default function is to
search only within the past year, while the advanced
search defaults to "forever".

- rick
Subject Author Posted

3dFWHMx and AlphaSim

Christine Smith May 15, 2015 04:24PM

Re: 3dFWHMx and AlphaSim

Christine Smith May 15, 2015 07:38PM

Re: 3dFWHMx and AlphaSim

rick reynolds May 15, 2015 08:55PM