目前 ,肝脏外科学发展迅速 ,肝段、亚肝段甚至楔形切除已成为可能 ,因此临床迫切需要对肝脏病变进行术前准确定位。门静脉系统是肝脏分叶分段的重要标志 ,ＣＴ门静脉成像 (ＣＴＰ)有助于肝脏病变的准确定位。近年来 ,多层螺旋ＣＴ已开始广泛应用于临床 ,其扫描及成像速度均较单 At present, the rapid development of extrahepatic surgery, hepatic segment, sub-hepatic segment or wedge resection has become possible, so the urgent need for clinical preoperative accurate positioning of liver lesions. Portal vein system is an important sign of hepatic lobule segmentation. CT portal vein imaging (CTP) can help the accurate localization of liver lesion. In recent years, multi-slice spiral CT has begun to be widely used in clinical, scanning and imaging speed than single