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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