Skip to main content
. Author manuscript; available in PMC: 2012 Jun 1.
Published in final edited form as: Cardiovasc Eng Technol. 2011 Feb 8;2(2):77–89. doi: 10.1007/s13239-011-0038-6

Table 2.

Comparison of computational and Doppler assessment of the proximal flow events. Simulation and measurement of the 3D PISA and VC area for a circular (0.39cm2) and rectangular (0.35cm2) orifice under different flow conditions. CFD PISA is compared to direct measurement of 3D color Doppler surface area at defined aliasing velocities. CFD simulated and 3D color Doppler VC area were compared to the actual orifice area (OA), since known. Vena Contracta, VC. Proximal Isovelocity Surface Area, PISA. Aliasing velocity, Va (cm/s)

PISA VC AREA
3D color Doppler CFD Simulation Relative Difference 3D color Doppler rel. diff. with OA CFD Simulation rel. diff. with OA
Circular Orifice
 30 ml 2.0cm2(Va=36) 2.4cm2(Va=36) 20% 0.40cm2 3% 0.36cm2 8%
 70 ml 3.0cm2(Va=41) 3.7cm2(Va=41) 23% 0.40cm2 3% 0.36cm2 8%
Rectangular Orifice
 30 ml 2.7cm2(Va=36) 2.9cm2(Va=36) 7% 0.40cm2 14% 0.32cm2 9%
 70 ml 3.7cm2(Va=36) 4.1cm2(Va=36) 11% 0.40cm2 14% 0.32cm2 9%
Combined Mean 15.3% 8.5%