Fig. 2From: Three-dimensional transthoracic echocardiographic evaluation of tricuspid regurgitation severity using proximal isovelocity surface area: comparison with volumetric methodMeasurement of 3D Rvol EROA. a RV was traced by dedicated software tools. b A pulsed-wave Doppler sample volume was placed into the RVOT to measure the VTI of outflow velocities. c Using the software to calculate RV volume from the 3D TTE data set, SVRV was calculated by subtracting RVESV from RVEDVBack to article page