Fig. 1
From: Cerebral arterial flow dynamics during systole and diastole phases in young and older healthy adults
Extracranial and intracranial acquisition imaging. Sagittal 3D phase-contrast angiography (A) was used as reference to set the different acquisition planes perpendicular to the flow direction of blood inflow. B and C (D and E) represent the amplitude and phase images of the intracranial (extracranial) plane, respectively. For the intracranial plane, 1: right internal carotid artery, 2: left internal carotid artery, 3: basilar artery. For the extracranial plane, 1: right internal carotid artery, 2: left internal carotid artery, 3: right vertebral artery, 4: left vertebral artery