Abstract #2420
Investigation of GRAPPA g-factor dependence on calibration scan phase errors and SNR
S. L. Talagala 1 , J. E. Sarlls 1 , and S. J. Inati 2
1
NMRF/NINDS, National Institutes of Health,
Bethesda, MD, United States,
2
FMRIF/NIMH,
National Institutes of Health, Bethesda, MD, United
States
Recent work indicates that the temporal SNR of GRAPPA
EPI data can be significantly compromised when using an
EPI based GRAPPA calibration scan and that a FLASH based
calibration scan can be used to correct this problem. In
this work, we verify this observation with simulated
data and show that phase inconsistencies in the
calibration scan can lead to high g-factor and hence,
lower temporal SNR in the GRAPPA EPI data. The
simulations also show that the detrimental effect of
calibration scan phase error is more prominent at higher
SNR.
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