多层螺旋CT无胆造影剂胰胆管成像

目的探讨多层螺旋CT无胆道造影剂胰胆管成像的可行性.方法10例无消化系统疾病患者及24例怀疑胰腺癌患者,行多层螺旋CT腹部多期增强扫描检查.利用曲面重建(CR)方法对无消化系统疾病患者及胰腺癌患者的胰管、胆总管及壶腹部结构进行曲面重建.使用容积显示技术(VRT)、最小密度投影(MinIP)及间接最小密度投影法(IMinIP)分别对胰腺癌患者的胰胆管系统进行重建.分析无消化系统疾病患者曲面成像中胰管、胆总管及壶腹部成像情况,并统计其对正常胰管、胆总管、壶腹部的显示率.对怀疑胰腺癌患者的曲面重建、容积显示技术、最小密度投影法、间接最小密度投影重建得到的胰胆管图像对病变的显示情况进行评价和比较.结果无消化系统疾病患者曲面重建图像中胰管显示率为90.0(9/10),平均直径(2.63±0.51)mm,其中88.9%(8/9)可见副胰管;胆总管显示率为100%(10/10),平均直径(7.45±1.12)mm;壶腹部显示率为60.0(6/10).胰腺癌患者使用曲面重建法、容积显示技术、最小密度投影法及间接最小密度投影法4种技术行胰胆管成像可得到胰管及胆总管全长及胆总管下端梗阻处的形态;其中间接最小密度投影法对各结构的显示率最高(98.6%),容积显示技术最低(68.1%).结论多层螺旋CT无胆道造影剂胰胆管造影简单无创,在显示胰胆管三维解剖结构的同时可显示其与周围器官组织的毗邻情况,特别是间接最小密度投影法,具有一定的临床应用价值,尤其适用于存在胆道梗阻的患者.

Non cholangio-contrast cholangiopancreatography using multi-slice spiral CT

OBJECTIVE: To investigate the feasibility of multi-slice spiral CT (MSCT) for cholangiopancreatography without cholangio-contrast. METHODS: Ten patients without any digestion system diseases and 24 patients with suspected pancreatic malignancy received the 16-slice spiral CT multi-phased contrast-enhanced scanning. The images of patients without any digestion system diseases and cancer-suffered patients were curved reformatted (CR) technique to perform the structure of pancreatic duct, common bile duct, and ampulla. The cholangiopancreatical systems of the cancer suffered patient were reconstructed through volume rendering technique (VRT), minimum intensity projection (MinIP), and indirect minimum intensity projection (IMinIP). The results of patients without any digestion system diseases in curved multiplanar reconstruction were analyzed; meanwhile display rates of the pancreatic duct, common bile duct, and ampulla were evaluated. RESULTS: of the four different cholangiopancreatographies were compared. RESULTS: The display rate of pancreatic duct in the CR images was 90.0 (9/10) with an average diameter of (2.63 +/- 0.51) mm. Sub-pancreatic duct could be seen in 88.9% (8/9) of them. The display rate of common bile duct in the CR images was 100% (10/10) with an average diameter of (7.45 +/- 1.12) mm. The display rate of ampulla was 60.0 (6/10), which was affected by the filling status of duodenum. The cholangiopancreatography using CR, VRT, MinIP, and IMinIP for patients with pancreatic cancer reveal the whole pancreatic and common bile duct, and the modality of distal obstructed bile duct. The result showed that IminIP got the best outcome (98.6%), while VRT got the worst (68.1%). CONCLUSION: The negative CT cholangiopancreatography is a simple and non-invasive examination. It reflects both the 3-dimensional cholangio-pancreatic anatomical structure and its adjacent condition. It has curtain clinical application values, especially for patients with obstructed duct system.