Figure 3From: A 3D numerical study of the collateral capacity of the circle of Willis with anatomical variation in the posterior circulationSchematic diagram of the stenosed models: (a) stenosis of 24% or Std24; (b) stenosis of 43% or Std43; (c) stenosis of 64% or Std64; (d) stenosis of 79% or Std79. Each semi-elliptical sketch is defined with three parameters: H1, V1 and V2.Back to article page