Fig. 1
From: MRI imaging characteristics of brainstem and midbrain aqueduct in patients with iNPH
Analysis of mesencephalic aqueduct morphology on magnetic resonance images of the brainstem. (a) Borders of the mesencephalic aqueduct in the mid-sagittal plane. (b) Diameters of the mesencephalic aqueduct at the rostral opening with the third ventricle, constriction, and termination at the fourth ventricle. (c) Measurement of these same aqueduct diameters in the axial plane using the automatic linkage feature of 3D Slicer. (d) Length of the mesencephalic aqueduct. (e) Angle between the anterior upper and posterior lower segments of the mesencephalic aqueduct. Segments are separated by the constriction (as shown in b).
