Understanding the aortic annulus is important for obtaining reproducible and durable aortic valve repair and allowing advances for TAVR treatment of aortic regurgitation. Significant limitations exist when using echocardiography and CT-based imaging with feature tracking at the aortic annulus. Cardiac Magnetic Resonance is used to obtain Regional Longitudinal Strain (RLS) and can be modified to obtain circumferential annular strain at the fibrous and muscular portions of the aortic valve annulus. Holst and colleagues use a novel method to characterize and prove that adverse annular deformation occurs at the muscular portion of the aortic valve annulus in patients with aortic regurgitation. The direction of muscular annular deformation in patients with aortic regurgitation is opposite to the direction of muscular annular deformation in patients with normal aortic valves.