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RV MPI = (RV IVCT + RV IVRT ) : RV ET

RV IVCT: TD, Apical 4C view.
RV IVRT: TD, Apical 4C view.
RV ET: TD, Apical 4C view.

RV MPI - Right Ventricular Myocardial Performance Index
RV IVCT -  RV Isovolumic Contraction Time
RV IVRT - RV Isovolumic Relaxation Time
RV ET - RV Ejection Time