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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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