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(a) Imaging geometry required with proposed volume flow measurement technique. The probe is oriented such that the transjugular intrahepatic portosystemic shunt (TIPS) intersects the c-surface (lateral-elevational surface) in cross section. (b) Angle of c-surface intersection is an independent variable. The TIPS can intersect the c-surface at angles which yield circular (θ1) to ellipsoidal (θ2, θ3) geometries and all cases would yield an identical volume flow estimate.
