Analysis of two-dimensional color flow imaging in a patient with a bicuspid aortic valve and an eccentric aortic regurgitation (AR) jet. Parasternal long-axis view (top). After selecting the best frame for AR jet visualization, the three components of AR (the proximal flow convergence, the vena contracta, and the distal expansion of the regurgitant jet spray) were identified. Standard parasternal short-axis view (middle). This image plane was almost parallel to the AR jet, and two-dimensional vena contracta area (2DVCA) measurement was not indicated. Apical five-chamber view (bottom). This image plane was almost perpendicular to the long axis of the AR jet. The smallest area between the proximal flow convergence and distal regurgitant jet spray was measured as 2DVCA (arrow). PSLAX, parasternal long-axis view; PSSAX, parasternal short-axis view; A5C, apical five-chamber view; Ao, aorta; LV, left ventricle.