MRI Criteria for acute myocarditis:
T2-weighted: any of the following
standard T2 sequences: regional high signal
standard T2 sequences: global signal intensity ratio (myocardium/skeletal muscle) ≥2
T2 mapping: increased T2 relaxation times
T1-weighted: any of the following
late enhancement imaging: non-ischemic, late enhancement
native T1 mapping: increased T1 relaxation times or extracellular volume
Supportive criteria:
signs of pericarditis: effusion or pericardial late enhancement
regional or global wall motion abnormalities