Enhanced parallel imaging with pseudo-linear magnetic fields using multi-channel matrix gradient coil

Motivation: Nonlinear magnetic fields have been used as an effective alternative to linear counterparts to offer improved spatial encoding efficiency. Goal(s): Nonlinear encoding methods often encounter center imaging blurring and require additional information for non-bijective encoding fields to differentiate mis-localized intensities. Approach: We propose to use pseudo-linear spatial encoding magnetic fields to address these challenges and enhance encoding efficiency. Based on that, two encoding strategies were proposed. Results: Center resolution discrepancy could be mitigated according to numerical simulations and preliminary experiments. Impact: The mitigation of the center blurring presents a reference for future research employing nonlinear gradient encoding.