在美国每年约发生50万例肺栓塞,多数栓子位于下肢深静脉。由于其临床诊断仅有半数是正确的,这就需要提供一种及时而准确诊断深静脉血栓形成的方法。目前常用静脉血管造影(PRG)。1976～1979年期间共检查了1,076例病人(2,152例肢体),这样就减少可疑病例的住院数目,节约了费用,也避免了 Approximately 500,000 pulmonary embolisms occur in the United States each year, with most of the emboli located in deep veins of the lower extremities. Because only half of its clinical diagnosis is correct, there is a need to provide a timely and accurate method for the diagnosis of deep venous thrombosis. Currently used venous angiography (PRG). A total of 1,076 patients (2,152 limbs) were examined between 1976 and 1979, thus reducing the number of hospitalizations for suspicious cases, saving costs and avoiding