Figure 2. Real-time three-dimensional echocardiography images using a commercially available system (EchoPAC PC, TomTec Imaging, Inc., Munich, Germany). (A) 3D images of RV are acquired in the RV focused four-chamber view. (B) Alignment of the LV / RV axis is based on the mitral valve, tricuspid valve, and apex. Aortic annulus and junction of the ventricle should be pointed identified manually. (C) Contour revision is edited at end-diastolic phase in four-chamber and short axis views from base to apex. (D) RV volume and RV function are measured by automatic analysis. LV: left ventricle, RV: right ventricle.