Inclusion Criteria:  Patients >18 years of age, with LVEF<40%. Patients presenting for viability assessment to Assiut university Heart Hospital, starting from October 2020 till September 2021, will be retrospectively recruited. Patients with a coronary angiography that is amenable for revascularization. The decision and type of revascularization will be determined by the treating physicians.  Exclusion Criteria:  Classic CMR and gadolinium-based dye contraindications including non-MRI compatible implants/foreign bodies (e.g. non-MRI compatible pacemaker, large pieces of shrapnel) and patients with eGFR<30 ml/min/1.73 m2. Patients with non-ischemic cardiomyopathy confirmed by both CMR and coronary angiography.