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Improvement of spiral MRI with the measured k‐space trajectory

The k‐space trajectory of a spiral imaging sequence was measured with a self‐encoding technique. The image quality improved dramatically when reconstructed with the measured k‐space trajectory. There were substantial artifacts in images reconstructed with the derived k‐space trajectory under the assumption of gradient system linearity. The results indicated the non‐linearity of the gradient system and the effectiveness of the correction technique.