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An EPI image of a human brain showing before (a) and after (b) the real-time off-resonance correction. Note the spatial shift as indicated by the line, and also that the shift allows the gradient nonlinearity correction to be more effective given the object is at the expected spatial position. This sequence was set up to illustrate the position shift with EPI and was not optimized for EPI image quality. EPI, echo-planar imaging.
