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Abstract #4286

Gradient Pre-Emphasis Correction for First-order Concomitant Field on Head-only Asymmetric Gradient MRI System

Shengzhen Tao1, Paul T Weavers1, Joshua D Trzasko1, Yunhong Shu1, Seung-Kyun Lee2, Lou Frigo3, Scott Hinks3, and Matt A Bernstein1

1Radiology, Mayo Clinic, Rochester, MN, United States, 2GE Global Research, Niskayuna, NY, United States, 3GE Healthcare, Milwaukee, WI, United States

Based on Maxwell’s equation, the spatial encoding gradient fields must be accompanied by spatially-varying higher-order concomitant fields. Different from conventional gradient systems whose concomitant fields contain second-order and higher spatial dependence, some MRI platforms employ asymmetric gradient systems, and their concomitant fields also include zero- and first-order terms. The first-order terms cause artifacts including image blurring and ghosting in spiral acquisition and echo shifting in EPI. Here, an efficient gradient pre-emphasis scheme suitable for real-time implementation is demonstrated to simultaneously correct all the first-order concomitant fields with a real-time implementation on gradient firmware typically used for eddy current compensation.

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