It should say on the png images what the units are.
It is also in the script.
They are: radians for rotations and mm for translations.
All the best,
On 8 Aug 2011, at 16:39, Woodman, Sandra wrote:
> Hi Mark (and anyone else who may know),
> Thank you so much for that script on eddy current correction, we believe this
> will be very helpful! We just want to be sure of what each column contains in
> the following files: ec_disp.txt, ec_rot.txt, ec_trans.txt. What are the units
> for the numbers? We assume that ec_rot.txt (for example) is rotation in the xyz
> plane, we would just like to confirm.
> Thank you,
> Sandra Woodman
> Mood and Motor Control Laboratory
> Athinoula Martinos Center for Biomedical Imaging
> Massachusetts General Hospital
> -----Original Message-----
> From: FSL - FMRIB's Software Library on behalf of Mark Jenkinson
> Sent: Thu 8/4/2011 11:36 AM
> To: [log in to unmask]
> Subject: Re: [FSL] motion correction help
> Dear Sandra,
> The email below (from the list) contains a script that lets you extract
> the parameters of the eddy-current correction in the same way that
> they are done for the functional pipeline in FEAT. I think that should
> give you what you want.
> All the best,
> On 4 Aug 2011, at 15:46, Woodman, Sandra wrote:
>> Hello FSL users,
>> We were wondering if there is any way to obtain the parameters used for
>> motion correction in the preprocessing of DTI images during the Eddy
>> Current correction (eddy_correct)? We know that motion correction and eddy
>> current correction are done with the same tool, but are not sure how the
>> two are separated and where we can find a report of what was done. We
>> have found one file (data.ecclog) but are not sure what the
>> values in the file correspond to.
>> We are trying to pull out these parameters in a way similar to what one
>> would do with fMRI if one wanted to use motion as a covariate in the
>> analyses. In our particular case we would like to calculate actual
>> motion correction values (in each plane) for each subject and show that
>> our patient cohort did not move more than our control cohort.
>> We have searched around the forums and we found some info regarding
>> rotating the bvec files, but we did not think that was what we wanted.
>> Thank you for any help!
>> Sandra Woodman
>> Mood and Motor Control Laboratory
>> Athinoula Martinos Center for Biomedical Imaging
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