B0 Concomitant Field Compensation for MRI Systems Employing Asymmetric Transverse Gradient Coils

Abstract

Purpose: Imaging gradients result in the generation of concomitant fields, or Maxwell fields, which are of increasing importance at higher gradient amplitudes. These time‐varying fields cause additional phase accumulation, which must be compensated for to avoid image artifacts. In the case of gradient systems employing symmetric design, the concomitant fields are well described with second‐order spatial variation. Gradient systems employing asymmetric design additionally generate concomitant fields with global (zeroth‐order or B0) and linear (first‐order) spatial dependence. (c) 2017 International Society for Magnetic Resonance in Medicine.