肝内外胆管结石64排CT数据三维重建及其临床意义

目的 研究64排螺旋CT数据肝脏及其管道系统三维重建在肝胆外科中的临床意义.方法 利用胆道结石病人的肝脏64排螺旋CT扫描数据.用程序和人工方法对图像进行分割.采用Mimics软件进行三维重建,重建出的肝脏及其管道模型分别以STL格式输出.然后导入到FreeForm Modeling System进行修饰和平滑.将肝脏和其内的各个管道系统及结石进行配准.结果 重建的肝脏模型能真实反映肝脏的实际体积和肝脏的解剖标志,并且通过调节肝脏的透明度可同时显示肝脏和肝内的动脉、静脉、门静脉、部分腹部血管、胆道系统及其内的结石等,肝内、外胆管结石的大致位置及个数清晰可见,肝内、外胆管的扩张及狭窄情况一目了然,形态逼真,立体感强.同时还能对模型放大、缩小和旋转等其他全方位观察的操作.结论 肝脏及其管道系统三维重建有利于术前规划及术中取净结石,对胆道狭窄和扩张进行恰当的处理.对减少术后结石的残留和复发有重要意义.

Clinical value of three-dimensional reconstruction of the biliary calculi based on 64-slice spiral CT scanning data

OBJECTIVE: To study the clinical value of 3-dimensional (3D) reconstruction of the liver and its ductal structures using 64-slice spiral CT data in hepatobiliary surgery. METHODS: The image data of 64-slice spiral CT scanning was obtained from patients with biliary calculi. Image segmentation was performed both using computer programs and manually, and 3D reconstruction of the liver was carried out using Mimics software. The reconstructed model of the liver and the ductal system was exported in STL format, and then into the FreeForm Modeling System for modification and smoothing, followed by image registration of the liver with the ductal system and the calculi. RESULTS: The reconstructed liver model accurately represented the actual size of the liver and its anatomic landmarks, and by adjusting the transparency of the liver, the hepatic and intrahepatic arteries, veins, the portal vein, some abdominal vessels and the biliary system with the calculi were clearly visualized. The calculi in the intrahepatic and extrahepatic bile ducts were distinct in terms of the location and number, and dilation and stenosis of the intrahepatic and extrahepatic bile ducts were also clearly observed. The model presented with realistic profile of the liver that allowed vivid 3D observation. The model also allowed zooming and rotation for observation in full views. CONCLUSIONS: The reconstructed model of the liver and its ductal system can be useful for preoperative planning and intraoperative complete removal of the calculi from the bile duct, and for the bile duct dilation and stenosis detected in the model, appropriate measures should be taken to reduce the residual calculi and prevent reoccurrence.