DGMIF 1 article published in JoVE Engineering In vitro Assessment of Aortic Regurgitation Using Four-Dimensional Flow Magnetic Resonance Imaging Doohyeon Kim1, Hyung Kyu Huh2, Hojin Ha1 1Interdisciplinary Program in Biohealth-Machinery Convergence Engineering, Kangwon National University, 2Medical Device Development Center, DGMIF Aortic regurgitation is an aortic valve heart disease. This manuscript demonstrates how four-dimensional flow magnetic resonance imaging can evaluate aortic regurgitation using in vitro heart valves mimicking aortic regurgitation.