Hi,
The magnitude image is used to get the registration between the
fieldmap and the EPI. This is done by warping the fieldmap
magnitude image to make it look like the distorted EPI and then
doing the registration between them. If there is any relative
change in position between the fieldmap scan and the EPI
then this is a crucial step.
I hope this answers your question.
All the best,
Mark
On 3 Mar 2009, at 07:16, Hallvard Røe Evensmoen wrote:
> Could anyone please tell me how the fieldmap magnitude image is used
> in the
> B0 unwarping in feat?
>
>
> Yours sincerely
>
> Hallvard Røe Evensmoen
>
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