Heart Failure with preserved Ejection Fraction is common, associated with high morbidity and mortality, and is challenging to diagnose. We have developed a novel patient friendly non-invasive technique to quantify myocardial stiffness using transient MR Elastography. Aortic valve closure results in a shear wave propagating through the myocardium. The torsional wave propagation can be visualised using a 2D pencil beam navigator positioned along the myocardium, using four breath holds each 15 seconds. With a temporal resolution of 0.5ms this technique can be used in all patients in sinus rhythm. Increased myocardial stiffness results in increased speed of shear wave propagation.