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Fig 2. Time-resolved 3D particle traces for 4 successive systolic timeframes illustrating blood flow in parts of the circle of Willis in 2 healthy volunteers with axial (ax) slab orientations. Color-coding corresponds to the local blood-flow velocity magnitude. A, Overview of the anterior part of the circle of Willis. Simultaneous systolic filling and local blood-flow characteristics of the left and right C1, M1, and A1 segments can clearly be appreciated. B, Targeted view of the left carotid siphon exhibiting complex-flow helical patterns and segmental-flow acceleration.
