Native T1 mapping in ischaemic myocardium. Panel A shows rest and stress T1 mapping and ΔT1 in ischaemic and nonischaemic myocardium when stratified by MBF, while panel B shows stratification according to MPR. MBF, myocardial blood flow; MPR, myocardial perfusion reserve; ΔT1, T1 mapping reactivity.