Abstract #3776
Closed-Form Solution Concomitant Field Correction Method for Echo Planar Imaging on Head-only Asymmetric Gradient MRI System
Shengzhen Tao 1 , Joshua D Trzasko 1 , Yunhong Shu 1 , Paul T Weavers 1 , Seung-Kyun Lee 2 , and Matt A Bernstein 1
1
Radiology, Mayo Clinic, Rochester, MN,
United States,
2
GE
Global Research, Niskayuna, NY, United States
The spatial encoding gradient field used in MRI always
includes spatially-varying higher order fields known as
concomitant fields. Different from conventional gradient
systems whose concomitant fields only contain 2nd-order
spatial dependency, some emerging MRI platforms employ
asymmetric gradient system, whose concomitant fields
also include zero- and first-order spatial dependencies.
The first-order terms cause further image distortion and
echo shift in echo planar imaging (EPI). In this work,
we develop a generalized waveform pre-emphasis framework
to correct first-order concomitant fields for arbitrary
axial-coronal oblique EPI acquisitions on a head-only
asymmetric gradient system, and provide closed-form
mathematical expressions for determining pre-emphasis
factors.
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