Hi Loic - The command that computes the motion measures is dmri_motion, and it 
can take either the eddy_correct or eddy format as input. The former format 
contains affine registration matrices with respect to the reference frame 
(which usually is the first b=0). The latter format contains the 
shift/rotation/etc. parameters of the registration rather than the matrix 
itself. You can run dmri_motion without arguments to see details.


Best,

a.y

________________________________
From: freesurfer-boun...@nmr.mgh.harvard.edu 
<freesurfer-boun...@nmr.mgh.harvard.edu> on behalf of Daumail, Loic Jean 
<ldaum...@mgh.harvard.edu>
Sent: Tuesday, June 12, 2018 5:33:17 PM
To: freesurfer@nmr.mgh.harvard.edu
Subject: [Freesurfer] dwi.ecclog file

Hello,

I have several questions regarding the dwi.ecclog file data from Tracula, using 
the FreeSurfer version V6.0.0.

1) Does Tracula still use eddy_correct from FSL, or was it updated with the new 
eddy function from FSL?

2) Are the values for each slice of dwi.ecclog relative to the first slice or 
to the previous slice, or to another template? is it the same for both rotation 
and translation values?

3) What is the coordinate system for the rotation values? Is there a way to 
determine the total rotation from these 9 values?

Thanks,

Sincerely,

Loic Daumail
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