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I've got 2 dti sequences from a Siemens skyra VD13 machine. One is A-P and the other is P-A. These are the standard Siemens sequence (not a research sequence): bipolar, interleaved, 2x2x2, 30 directions.

I tried topup->eddy_correct->applytopup
and for comparison:
topup->eddy->applytopup.

It is always possible that I got some of the parameters wrong for eddy, but it looks to me like eddy_correct did a MUCH nicer job. I'm attaching a couple of screenshots of equivalent slices.   Please advise: Did I likely do something wrong when I ran eddy?  Or is eddy_correct just a better choice for my images?

eddy_correct->applytopup:
Inline image 2
========================================
eddy->applytopup
Inline image 1

Thanks in advance,

Dianne
-- 
Dianne Patterson, Ph.D.
Research Scientist
[log in to unmask]
or 
[log in to unmask]
University of Arizona
Speech and Hearing Science 314
1131 E 2nd Street, Building #71
(Just East of Harvill)
621-9877
==============
"If you have an apple and I have an apple and we exchange these apples then you and I will still each have one apple. But if you have an idea and I have an idea and we exchange these ideas, then each of us will have two ideas." - George Bernard Shaw

--
Dianne Patterson, Ph.D.
Research Scientist
[log in to unmask]
or 
[log in to unmask]
University of Arizona
Speech and Hearing Science 314
1131 E 2nd Street, Building #71
(Just East of Harvill)
621-9877
==============
"If you have an apple and I have an apple and we exchange these apples then you and I will still each have one apple. But if you have an idea and I have an idea and we exchange these ideas, then each of us will have two ideas." - George Bernard Shaw
==============