Cardiovascular magnetic resonance by non contrast T1-mapping allows assessment of severity of injury in acute myocardial infarction. by Dall'Armellina, E, Piechnik, S, Ferreira, V, Si, Q, Robson, M, Francis, J, Cuculi, F, Kharbanda, R, Banning, A, Choudhury, R, Karamitsos, T, Neubauer, S