Dual-Polarity GRAPPA for the Robust Reconstruction of Multi-Channel EPI Data
W. Scott Hoge 1,2 and Jonathan R Polimeni 2,3
Dept. of Radiology, Brigham and Women's
Hosp, Boston, MA, United States,
Medical School, Boston, MA, United States,
of Radiology, Athinoula A. Martinos Center for
Biomedical Imaging, Massachusetts General Hospital,
Charlestown, MA, United States
EPI is widely used in neuroimaging applications.
However, many imaging artifacts are inherent in the
method, with Nyquist ghosting one of the most prominent.
Conventional methods to correct the sampling errors that
give rise to Nyquist ghosts typically model only linear
and constant phase error terms. In this work, we present
a Dual-Polarity GRAPPA method to address the limitations
of conventional Nyquist ghost correction. In-vivo
results are shown that demonstrate the ability of the
method to correct higher-order phase errors in EPI data.
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