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Measurements of cord motion dynamics. A) The imaging plane superimposed on the MRI mid-sagittal image in a CMI patient. (B) The cord region of interest superimposed on the MRI phase contrast velocity image. C) Average cord velocity waveforms for a representative CMI and control patient. D) Cord displacement waveforms from the representative CMI and control patient obtained by integration of the velocity waveforms with respect to time for one cardiac cycle.
