CMR T1 mapping and strain analysis in idiopathic inflammatory myopathy: evaluation in patients with negative late gadolinium enhancement and preserved ejection fraction.

• Myocardial abnormality in IIM is often subclinical and leads to poor prognosis. • Conventional CMR parameters have limitations in early detection of cardiac function and tissue changes. • CMR T1 mapping techniques and myocardial strain analysis have the potential to provide detailed information on cardiac histology and function.