Dear Eddy,
> I should apply FUGUE corrections to EPI subjects studies. I read the
> FUGUE
> docs and tutorial and I find out that is necessary use the "phase
> difference
> map".
> I don't have this map, can I built it from other information?
In order to perform FUGUE corrections you need to also (in addition to
your EPI data) acquire field-map data. This is typically Gradient-echo
scans obtained with two different echo-times. The phase-difference map
is simply the difference between the phase-maps for the two Gradient-
echo acquisitions.
Good Luck Jesper
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