Im DJ, et al. - This study was designed to examine dual-energy CT findings predictive of clinical outcome and to determine the incremental risk stratification benefit of dual-energy CT findings compared with CT ventricular diameter ratio in patients with acute pulmonary embolism. Among patients with acute PE, lung perfusion defect volume, compared to ventricular diameter ratio alone, seemed to add no statistically significant benefit for prediction of death of any cause within 30 days or of pulmonary embolism–related death.