Fig. 1

Experimental set up. A Body positions during MR scan, example of a subject being scanned in upright seated position and then moved to a supine position within an upright MR scanner. B Location of phase-contrast imaging axial slice at the mid-C2 level (yellow dotted line) used to image CSF flow and spinal cord pulsation. C Phase image from the phase-contrast imaging depicted in the previous image. D Region of interest (ROI) drawn manually to delineate the CSF in the spinal canal excluding the spinal cord on the phase image