Hi Tim – The best method to use will depend on the data you have. If you have very high b-values, you should use eddy. You can turn off the eddy current part of the preprocessing with “set eddy=0” in the config file, and run trac-all on your corrected images.

Best, a.y

From: <freesurfer-bounces@nmr.mgh.harvard.edumailto:freesurfer-bounces@nmr.mgh.harvard.edu> on behalf of Timothy Hendrickson <hendr522@umn.edumailto:hendr522@umn.edu> Reply-To: Freesurfer support list <freesurfer@nmr.mgh.harvard.edumailto:freesurfer@nmr.mgh.harvard.edu> Date: Monday, August 13, 2018 at 4:00 PM To: Freesurfer support list <freesurfer@nmr.mgh.harvard.edumailto:freesurfer@nmr.mgh.harvard.edu> Subject: [Freesurfer] TRACUAL eddy_correct Usage

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Hello,

I notice that within TRACULA 6.0 that eddy_correct is used for the eddy current correction. This is an older tool as compared to eddy, is there a reason that eddy_correct is still used? Have you done cross comparisons between eddy_correct and eddy? If so did you find much difference in eddy current corrections?

Thanks!

-Tim