T1 mapping cardiovascular magnetic resonance (CMR) is achieving growing importance because it allows quantification of diffuse fibrosis not detectable with conventional late gadolinium enhancement technique. Mascherbauer et al1 wrote an elegant article on the diagnostic and prognostic role of postcontrast T1 mapping in patients with heart failure with preserved ejection fraction, a condition of increasing clinical relevance. In particular, they demonstrated that postcontrast T1 mapping values correlated with established clinical, echocardiographic, hemodynamic, and biohumoral markers of disease and independently predicted major events during a 17±13-month follow-up. They used a relatively simple and robust imaging protocol2: a midventricular short axis was acquired 15 …