STereotactic RadioAblation by Multimodal Imaging for VT (STRA-MI-VT)

Inclusion Criteria: * ICD/S-ICD recipients with refractory VT * Not eligible for conventional catheter ablation or -in alternative- that have undergone failing conventional catheter ablation attempts, refusing surgery for the treatment of the arrhythmia. * LVEF ≥ 20%. * Age ≥ 50 years. * Signed an IRB approved written informed consent document. Exclusion Criteria: * Previous radiotherapy with cardiac involvement. * Pregnancy or breastfeeding. * Active myocardial ischemia. * Acute revascularation in the past 120 days. * Acute hemodynamic instability (cardiogenic shock/NYHA IV). * Serious disease with presumed life expectancy less than 12 months. * Any condition that is deemed a contraindication in the judgment of the investigators.