Figure 2

Time-SLIP bSSFP cine images during inhalation and exhalation. The results of the MRI cine images are shown in sagittal views of a healthy 44-year-old male volunteer. The Time-SLIP pulse was applied perpendicular to the sagittal plane to encompass the red dotted rectangle. a) On the sagittal image during inhalation, a caudo-cranial movement of CSF was observed at the aqueduct of Sylvius (blue arrows) and the prepontine subarachnoid space toward the suprasellar cistern and the third ventricle (red arrows). This CSF movement was noted during the initiation of inhalation lasting for about 2.5 seconds. b) On the sagittal image, during the period of exhalation, a cranio-caudad movement of CSF to the prepontine subarachnoid space (red arrows) was observed. Note that the movement of CSF is predominately observed in the ventral side of the subarachnoid space, which may be due to a pressure difference between the dorsal and ventral sides of the volunteer in the supine position.