Real-time phase-contrast flow MRI based on highly undersampled radial FLASH employs fast gradients that make concomitant field contributions relevant even at 3 T. In order to correct for phase errors a spoke-wise Maxwell correction has been developed and successfully integrated into a model-based reconstruction. For radial trajectories corrections for individual k-space lines are required as concomitant fields may change from spoke to spoke. The proposed method significantly improves phase errors in velocity maps as shown for three-directional real-time phase-contrast flow MRI of the human aortic arch.
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