下肢深静脉血栓(Deep Vein Throbosis,DVT)形成是一种潜在的静脉回流障碍性疾病。DVT形成的早期没有明显的临床症状不易被察觉,很难被诊断。如果不及时的诊疗会导致肺栓塞等有害的血管事件发生,甚至引起昏迷。但是如果在未形成血栓的情况下应用抗凝药物又会增加出血的风险。目前DVT造影是诊断深静脉血栓形成的金标准,但由于其是一种侵入性、高成本的检查不易被 Deep Vein Thrombosis (DVT) formation is a potential disorder of venous reflux disease. The early formation of DVT no obvious clinical symptoms are not easily detected, it is difficult to be diagnosed. If not timely diagnosis and treatment will lead to harmful vascular events such as pulmonary embolism, and even lead to coma. However, the use of anticoagulants in the absence of thrombosis increases the risk of bleeding. At present, DVT is the gold standard for the diagnosis of DVT, but because it is an invasive and costly test, it is not easy to be