目的：用多层螺旋CT前瞻性地观测肝内肝门静脉的解剖和变异。方法 对200名正常人，使用16排多层螺旋CT行上腹部CT动态增强扫描，将肝内肝门静脉的解剖和变异进行分型。并对肝门静脉系统各血管参数进行定量研究，行统计学分析。结果：肝门静脉正常型占81.5% (163例)，Ⅰ、Ⅱ、Ⅲ型变异分别占11.5％ (23例、6.5％(13例)、0.5％ (1例)，未发现有门脉左支水平段或右支缺如。在不同性别间门静脉直径（Dpv）、脾静脉直径（Dsv）及肠系膜上静脉直径（Dsmv）有统计学意义（P<0.05）；除男性≥50岁组较＜50岁组门静脉长度（Lpv）有所延长外，其他男性、女性不同年龄组间，肝门静脉系统各管径均无统计学意义（P>0.05）。结论：多层螺旋CT门静脉血管成像（multi-slice CT portography，MSCTP）能方便而清楚地显示肝内门静脉解剖和变异。

　　Objective: To explore anatomic features and variations of intrahepatic portal vein adoting multi-slice CT. Methods: Enhancement scanning CT data of the portal and hepatic venous systems from 200 healthy volunteers were analyzed and classified according to their anatomic features, while, the parameters of portal system were analyzed quantitatively. Results：For all patients examined, the intrahepatic portal vein system of 163 patients (81.5 %) distributed normally, of 23 (11.5 %) , 13 (6.5 %) and 1 (0.5 %) appeared Ⅰ, Ⅱ and Ⅲ types of anatomic variations respectively, however, the absence of the horizontal segment of the left portal vein or right portal vein was not be observed. Dpv, Dsv and Dsmv had significant difference（P<0.05）between male and females. Conclusions：The anatomy and variations of the hepatic portal veins can be easily recognized under multi-slice CT portography(MSCTP).