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Methods The HIPAA compliant prospective study was IRB approved. Sixteen patients (mean age 15.4 years; range 5-25 years) underwent cardiac magnetic resonance (CMR) (1.5-T) including non-contrast short axis T1 mapping (modified Look-Locker [MOLLI] sequence). Twelve patients with no intrinsic myocardial abnormality based on clinical history, standard biomarkers and echocardiographic criteria were compared with 3 patients having cardiac dysfunction and 1 patient with hypertrophic cardiomyopathy (HCM). Short axis images were manually contoured to outline the epicardium and endocardium using AHA 16-segment model yielding 192 normal myocardial segments, 48 segments in patients with cardiac dysfunction, and 16 segments in a patient with HCM. Patient groups were compared using one-way analysis of co-variance (ANOVA). Chi-squared test was performed to compare appropriateness of discrete data. Receiver operating characteristic (ROC) curve was used to obtain a cut-off value of T1 relaxation time. Statistical significance was defined as p < 0.05.

Quantitative non-contrast T1 mapping of left ventricle in children and young adults