多层螺旋CT下肢血管成像的临床应用

Clinical Application of Three Dimensional CT Angiography with Multi-slice Spiral CT in Lower Limb

目的:评价多层螺旋CT下肢血管成像技术及其在下肢血管性疾病中的临床应用价值。方法:回顾性分析 33例可疑下肢血管性疾病患者的MSCT血管成像资料,扫描条件:层厚1．25mm,螺距1．75,扫描时间15-20 s。对比剂总量80-100 ml,注射流率3．5-4．0 ml／s。在工作站上进行下肢血管图像重组。结果:全部病例下肢动脉的重组图像均能充分显示下肢动脉的空间关系及解剖细节,以VR和2D-MIP图像显示最佳,并能明确诊断下肢动脉性疾病和血管畸型;观察下肢静脉以2D-MIP图像为主。能对静脉血栓的诊断提供帮助。结论:MSCT下肢血管成像能准确直观地显示下肢血管的立体解剖特点,为下肢血管性疾病的诊断与治疗提供重要依据,是四肢血管病变较为理想的检查方法。

Objective：To evaluate the technique of three-dimensional CT angiography （3DCTA） with multi-slice spiral CT and its clinical application in vascular disorders of lower limb. Methods： Multi-slice spiral CT angiography was done in 33 patients with suspected vascular disorders of lower limb. Using GE Light-speed Ultra 16 slice CT with real time helical thin-slice CT scanning. The scanning parameters were ： 1.25 mm, 120 kV, 350 -400 mA, total scan time 15 - 20s, contrast agent 100 ml,infusing rate 3.5-4.0 ml/s. 3D images of lower limb vessel were done at the console workstation. Results： Space relationship and anatomical detail of lower limbs artery could exactly be shown by 3D images in all of the patients. With VR images and 2DMIP images as the best,not only the lower limb artery diseases and malformation,but also the space anatomical relationship between lower limb artery and tumor could be clearly demonstrated, providing pre-surgery information in detail. 2D-MIP technique was the best for revealing lower limb vein,which was helpful in the diagnosis of vein thrombosis. Conclusion：3D-CTA is a minimal invasive technique and play an important role in the recognition of the anatomical detail of lower limb vessels,which provides useful information for the diagnosis and treatment planning. It is an ideal measure for the diagnosis of extremity vascular disorders.