Study of Cardiac PET/CT Imaging to Guide Ablation Treatment of Ventricular Tachycardia

Inclusion Criteria: * Clinical indication for ventricular tachycardia (VT) ablation (at least one clinical episode of sustained VT) despite antiarrhythmic drug therapy, or if the patient does not wish to be on one * Ischemic or nonischemic cardiomyopathy * Sustained monomorphic VT Exclusion Criteria: * Right ventricular VT * Polymorphic VT or ventricular fibrillation (VF) being the sole detected clinical arrhythmia * Patient is unable to sign informed consent * Recent myocardial infarction less than 30 days * Recent ablation for ventricular tachycardia less than 30 days * Patient is unwilling or unable to cooperate with the study * Prosthetic mitral or aortic valve * General contraindications to VT ablation, e.g., major contraindication to anticoagulation therapy, known presence of left ventricular thrombus, reversible causes of VT or VF * General contraindications to PET imaging, e.g., pregnancy or lactation * General contraindication to magnetic resonance imaging or to the administration of gadolinium. * Contraindication to the placement of hemodynamic support devices, i.e. the presence of mechanical valves or lack of adequate vascular access