Real-time 3-dimensional volumetric ultrasound imaging of the vena contracta for stenotic valves with the use of echocardiographic contrast imaging: in vitro pulsatile flow studies.
Shandas R, Kwon J, Valdes-Cruz L. Real-time 3-dimensional volumetric ultrasound imaging of the vena contracta for stenotic valves with the use of echocardiographic contrast imaging: in vitro pulsatile flow studies. J Am Soc Echocardiogr. 1999 Jul; 12(7):541-50.