The diagnosis of myocarditis can be challenging given that symptoms, clinical 
exam findings, electrocardiogram results, biomarkers, and echocardiogram results 
are often non-specific. Endocardial biopsy is an established method for 
diagnosing myocarditis, but carries the risk of complications and false negative 
results. Cardiac magnetic resonance imaging (MRI) has become the primary 
non-invasive imaging tool in patients with suspected myocarditis. Myocarditis 
can be diagnosed by using three tissue markers including edema, 
hyperemia/capillary leak, and necrosis/fibrosis. The interpretation of cardiac 
MR findings can be confusing, especially when the myocardium is diffusely 
involved. Using T1 and T2 maps, the diagnosis of myocarditis can be made even in 
cases of global myocarditis with the help of quantitative analysis. We herein 
describe a case of acute global myocarditis which was diagnosed by using 
quantitative T1 and T2 mapping.