Figure 2: Color DTI waveforms obtained from the RV free wall describing the various phases in ventricular systole and diastole. There are 5 discrete waveforms occurring within the cardiac cycle, as seen on the Doppler display: (1) isovolumic contraction time (ICT) velocity, (2) systolic (S0) velocity, (3) isovolumic relaxation time (IRT) velocity, (4) early diastolic velocity (E0), and (5) late diastolic velocity (A0). Dotted vertical lines represent PV opening (PVO) and PV closure (PVC). Copyright from Horton et al. (J Am Soc Echocardiogr 2009; 22: 776-792) with permission from the publisher, Copyright 2009, the Journal of the American Society of Echocardiography.