Factors affecting the lung perfused blood volume in patients with intrapulmonary clots after anti-coagulation therapy

•Dual-energy CT can provide morphological and functional lung images in the same examination.•The subsequent dual-energy CT demonstrates the increased whole lung perfused blood volume (V120) despite the residual intrapulmonary clots after treatment in one examination.•The increased whole lung perfusion (V120) and a decreased low perfusion volume (V5) result in the improvement in the low perfusion rate (%V5) in the patients with acute pulmonary embolism after treatment.