Hi,
> When you acquire a subject twice (test and retest), is it possible to
> acquire the fieldmap only once and use the same fieldmap for unwarping the
> two studies?
It turns out that there is in fact some resemblance between one
fieldmap and another in the same subject, as you might expect, but it
does also depend on the exact orientation of the head in the magnet
and the shim, so you won't get a very good result from a fieldmap from
a different session.
Best,
Matthew
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