Keywords: Image Reconstruction, Image Reconstruction, Artifact Reduction
Motivation: Artifacts caused by concomitant fields are significant at lower B0 field strengths, larger distances from isocenter, and when using longer readouts. This is a significant limitation for large-FOV dynamic imaging at low- and mid- field strengths.
Goal(s): To demonstrate dynamic MRI with concomitant field correction.
Approach: We combine state-of-the-art dynamic MRI using undersampling and constrained reconstruction, with a concomitant field mitigation approach (MaxGIRF) that uses a higher-order encoding matrix.
Results: We demonstrate significant artifact reduction in large-FOV dynamic MRI of the lung in coronal orientation at 0.55 Tesla.
Impact: This work resolves one major constraint that currently limits large-FOV and off-isocenter dynamic MRI at low field strengths. This could provide better imaging of the lung, abdomen, and obese subjects, and better guidance of interventions that utilize a table shift.
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