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Results of phantom experiments. Images reconstructed using GRAPPA (top row) and the proposed RAKI (bottom row) reconstructions from noisy data sets for various acceleration rates, as well as a fully-sampled noisy reference image. Starting with rate 4, the noise performance of RAKI improves upon that of GRAPPA. RAKI reconstructions at acceleration rates 4 and 5 show visually improved noise properties over GRAPPA, which has high levels of noise amplification.
