Hi,
I would apply eddy first and then apply fieldmap correction afterwards. I would advise using epi_reg to apply the fieldmap correction, as we find that this works best for us.
All the best,
Mark
On 27 Nov 2013, at 18:25, Mark Elliott <[log in to unmask]> wrote:
> We have DTI data for which we would like to use EDDY for eddy-current distortion and motion correction.
>
> We do NOT have an reversed phase-encode acquisition so we cannot use TOPUP before the EDDY step (as I believe is recommended).
>
> We do have a separately acquired B0map, so we would like to first apply the more conventional B0 distortion correction using FUGUE (similar to our BOLD processing pipeline).
>
> My questions are general: Would it be appropriate to perform a FUGUE B0map correction, followed by EDDY (w/o TOPUP) on our DTI data? Is there an inherent difference between using TOPUP to determine and correct for B0 distortions rather than FUGUE with a B0map?
>
> Thanks for any and all advice on this subject.
>
> Mark.
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