Fig. 1

Sagittal T2 TSE MRI of the A cervical and thoracic spine and B thoracic and lumbar spine from one representative animal with labelled spinal levels and planes of the phase-contrast MRI (PC-MRI) images. C–F Representative axial PC-MRI (phase) at peak systolic (caudal) and at peak diastolic (cranial) flow for each spinal level with scale bar (velocity; cm/s). G A schematic demonstrating which pixels are assigned within the ROI. Blue is the ventral SAS ROI; pink is the dorsal SAS ROI. TSE turbo spin echo, MRI magnetic resonance imaging, ROI region of interest, SAS subarachnoid space