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Fig. 1A. —Diagrams of vector analysis of blood flow velocity. Angle A is intersecting angle between axis of abdominal aorta and course of common iliac artery and is less than 90° for both right and left iliac arteries. Diagram shows how to calculate blood flow velocity parallel to vessel wall (axial component of vector of blood flow velocity) (cosA x V_head-caudal - sinA x V_right-left), which constitutes axial component of wall shear rate for right common iliac artery.