中文摘要：

目的 评价64层螺旋CT肺血管造影（CTPA）联合下肢CT静脉造影检查（CTV）,在下肢深静脉血栓（DVT）中的诊断作用.方法 连续收集临床上疑似下肢深静脉血栓并行64层螺旋CTPA联合下肢CTV检查的患者.按照CTPA和CTV检查的图像质量进行筛选.根据患者肺动脉和下肢深静脉内是否存在血栓进行分析,并对下肢静脉内血栓最近端位置进行统计.最终有109例患者纳入研究.结果 肺动脉和下肢静脉内同时有血栓的患者39例,单纯急性肺血栓患者1例,单纯DVT患者57例,肺动脉和下肢静脉内均无血栓的患者12例.DVT患者血栓最上端位于下腔静脉14例,位于盆腔髂静脉63例,位于大腿（股腘静脉）13例,位于小腿（胫腓静脉）6例.结论 64层螺旋CTPA联合下肢CTV检查对DVT疑似患者的肺动脉内血栓检出具有重要意义,避免了36.7%患者中肺动脉内血栓的漏诊.

英文摘要：

Objective To study the value of CT venography（CTV） in combination with CT pulmonary angiography（CTPA）using MSCT in diagnosis of deep venous thrombosis（DVT） of lower limb. Methods 109 patients with clinically suspected DVT underwent combined CTPA and CTV examinations. CTV and CTPA images were analysed and the proximal localizations of the embolus in low er extremity venous were also evaluated. Results There were 39 patients with both pulmonary embolus（PE） and DVT at the same patient, 1 patient only with auct PE and 57 patients only with DVT, 12 patients had neither PE nor DVT. For DVT,the proximal localizations of embolus located at inferior vena cava in 14 cases,iliac vein in 63 cases, femoropopliteal vein in 13 cases and tibiofibular vein in 6 cases. Conclusion CTV in combination with CTPA is of significance in detecting the patients suspected with pulmonary ar tery embolus,which can provide information to avoid PE missed in 36.7% patients.