Abstract #1635
Slice-specific frequencies can reduce ghosting artifacts in T2*-weighted single-shot EPI with GRAPPA
Jrgen Finsterbusch 1,2
1
Department of Systems Neuroscience,
University Medical Center Hamburg-Eppendorf, Hamburg,
Germany,
2
Neuroimage
Nord, Hamburg-Kiel-Lbeck, Germany
In regions with magnetic field inhomogeneities, e.g.
close to significant susceptibility differences as in
the vicinity of major air cavities, T2*-weighted
single-shot EPI with GRAPPA is susceptible to ghosting
artifacts. To some extend, these artifacts seem to be
related to the offset of the resonance frequency that is
not handled appropriately by the GRAPPA reconstruction
algorithm. Here, it is shown that with slice-specific
frequencies for the data acquisition, i.e. the
analog-to-digital converters demodulation frequency and
phase settings, these artifacts can be reduced or even
avoided.
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