中文摘要：

目的：应用三维相位对比磁共振血管成像技术（3D PC MRV）及 MR 相位对比电影法（MR PC-cine）探讨正常人颈静脉的形态及血流动力学特征。方法65例志愿者进行颈静脉3D PC MRV 及 MR PC-cine 扫描。扫描范围为窦汇至头臂静脉水平；颈静脉形态的判断标准如下：颈静脉缺如、针尖状狭窄（横截面积〈12.5 mm^2）、局部不显示视为异常；扁平状、新月形、椭圆形、圆形视为正常表现。MR PC-cine 序列扫描定位于 C2～C3水平,与颈静脉走行方向垂直,速率编码（VENC）为50 cm/s。结果65例志愿者中,9例（13.85%）出现单侧颈静脉针尖状狭窄或缺如,左侧（8例）异常的比例高于右侧（1例）（P 〈0.05）；颈静脉形态异常比例与年龄有相关性（r=0.258,P =0.038）；右侧颈静脉血流动力学参数值均高于左侧（P 〈0.05）。结论志愿者颈静脉的形态及血流动力学存在侧别差异,颈静脉形态异常与年龄有弱相关性。

英文摘要：

Objective To investigate jugular vein morphological changes with three dimension phase contrast magnetic resonance venography（3D PC MRV）,and to explore hemodynamic features using MR phase contrast cine （MR PC cine）.Methods Sixty-five healthy volunteers performed 3D PC MRV and MR PC-cine sannings.MRV ranged from torcular herophili to brachiocephalic veins, and the raw data of PC-cine was acquired at cervical 2-3（C2-C3）level perpendicular to the Jugular veins（JVs）with the maximum encoding velocity of 50 cm/sec.Jugular vein showing absent or tip shape（cross-sectional area less than 12.5 mm^2 ）was considered abnormal,and flat,crescent,oval,round shapes were considered normal.Data of PC-cine was processed by computer to evaluate the hemodynamic features.Results Nine （13.85%）of 65 cases were abnormal that unilateral jugular vein showing needle-pointed narrow or absent,and 8 cases on the left,and one case on the right;Weak correlation was found between jugular veins pattern and the age.The right sided values in volunteers were higher than that of the left side.Conclusion The morphology and hemodynamics of jugular veins in volunteers showed significant difference between sides,and weak correlation is found between the morphology and aging.