Andrew Hahn1, Andrew Nencka1,
Daniel Rowe2
1Biophysics, Medical College of
Wisconsin, Milwaukee, WI, United States; 2Mathematics, Statistics,
and Computer Science, Marquette University, Milwaukee, WI
Methods
of correcting the effects resulting from magnetic field inhomogeneities and
off-resonance that have proven to be most effective in recovering homogenous
image intensity, recovering signal dropout and providing optimal image
unwarping often involve inverting a matrix kernel constructed with prior
knowledge of the magnetic field. Field
maps estimated using echo-planar images are very convenient to acquire, but
are not compatible with the mentioned group of algorithms due to their
warped space coordinates. A
straightforward method is presented providing a connection between
echo-planar based maps and optimal correction schemes leveraging both the
convenience and performance of the combination.
Keywords