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Schematic demonstration of the undersampling patterns used in the study. (a) Representative examples of the applied 1D variable-density random undersampled mask used for 1st and 2nd echo image. (b) Example sets of ky-t 1D variable-density random undersampling masks for eight echo times. The undersampling mask varies along the echo dimension, and the mask-set was randomized for each iteration during the network training to augment the training process.
