Objective To evaluate the feasibility and clinical value of color Doppler flow imaging(CDFI) guided inferior vena caval filterinsertion(IVCFI).
目的探讨超声引导经皮穿刺下腔静脉滤器置入（IVCFI）术的可行性、安全性和临床实用价值。
2
Conclusion: to prevent pulmonary embolism, it is effective to inferior vena cava filterinsertion before the patient with acute DVT is given by thrombolytic therapy.
结论：在急性下肢深静脉血栓抗凝溶栓治疗前置入下腔静脉滤器，是预防肺栓塞安全有效的方法。
3
The precise expression for the insertion loss of the parallel coupled microstrip line output bandpass filter has been given on the basis of related mathematical models.