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Magnetic resonance angiogram of cerebral arteries for non-invasive optimal vessel analysis (NOVA). Blood flow volume measures were performed on a plane (square cutting area) perpendicular to the plane of blood flow (arrow) in the vessels. The flow curve is also shown. The distal and proximal segments of the anterior cerebral arteries were defined as distal and proximal to anterior communicating artery, respectively. A, anterior; R, right; S, superior.
