Katherine R. Birchard is Assistant Professor of Radiology, Cardiothoracic Imaging, Department of Radiology, University of North Carolina, Chapel Hill. Kiran Reddy Busireddy, Department of Radiology, University of North Carolina, Chapel Hill. Richard C. Semelka is Professor of Radiology, Director of Magnetic Resonance Imaging, Vice Chair of Quality and Safety, Department of Radiology, University of North Carolina, Chapel Hill.