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Comparison of magnetization transfer ratio asymmetry (MTRasym) between spin-echo (SE) and gradient-echo (GE) echo-planar imaging (EPI) by paired t-test (SE minus GE): (a) in gray/white matter of the cervical spinal cord. (b) in cerebrospinal fluid. The black square on the curve shows that the MTRasym values obtained from SE and GE are significantly different at that particular frequency offset by paired t-test (P < 0.05).
