1. From the Division of Imaging Sciences and Biomedical Engineering (C.H.P.J., M.R.M., A.J.W., A.P., R.M.R., G.F.G., E.N., R.M.B.), Wellcome Trust and EPSRC Medical Engineering Center (R.M.R., E.N., R.M.B.), BHF Centre of Excellence (C.H.P.J., D.P., M.R.M., R.M.R., M.S.M., E.N., R.M.B.), and NIHR Biomedical Research Centre (C.H.P.J., D.P., M.R.M., R.M.R., M.S.M., E.N., R.M.B.), King's College London, London, UK; Philips Healthcare, Guildford, UK (A.J.W.); Cardiovascular Centre, Guy's and St. Thomas'...