1. From the Cardiovascular Imaging Department, Division of Imaging Sciences and Biomedical Engineering (V.O.P., Z.S., A.P., P.C., G.C.-W., E.N.), The Lupus Unit, Rayne’s Institute (D.D., S.S.), and Department of Medical Physics and Bioengineering, Division of Imaging Sciences and Biomedical Engineering (T.S.), King’s College London, London, UK; and Philips Innovative Technologies, Clinical Research, London, UK (T.V.).