目的 评价多排螺旋CT的多平面重组技术(MPR)对胃癌侵犯浆膜层的诊断价值。方法 选择36例经手术病理证实的胃 癌，有完整的术前低张水充盈法MSCT三期增强扫描资料，由两名高年资放射科医生分别对横断位图像及MPR图像进 行回顾性分析，协商确定胃癌侵犯胃浆膜层的诊断，最后结果与手术病理对照；采用SPSS 13.0软件，用卡方检验 对横断位图像和MPR图像进行分析，P<0.05为具有统计学意义。结果 横断位显示胃癌浆膜层侵犯的准确性、敏感 性、特异性分别为66.67%、63.64%、71.43%；MPR显示胃癌浆膜层侵犯的准确性、敏感性、特异性分别为86.11%、 86.36%、85.71%。MPR在判断胃癌是否侵犯浆膜层的准确性明显高于横断位，两者的差别有统计学意义(p＜0.05)。 结论 多层螺旋CT的多平面重组技术(MPR)能大大增加胃癌周围侵犯的检出率，提高胃癌术前T分期的准确性。

Objective To evaluate the value of multi-detector row spiral CT multi-planar reconstruction (MPR) technique in diagnosing the gastric cancer invasion serosal. Methods 36 cases confirmed by surgery pathology of gastric cancer with completed scanning data of preoperative low water filling method to triplephase enhancedMSCT. Then respectively, the images were analyzed form the cross-sectional images compared with MPR images by two radiologists who were with high qualification, and determined the diagnosis of gastric cancer invasion on the gastric serosa compared with surgical pathology finally. Statistical analysis was performed using SPSS 13.0 software. Using Chi-square test performed comparison of the cross sectional images and MPR images, and P <0.05 is statistically significant. Results The accuracy, sensitivity and specificity of cross sectional image in diagnosis of serosal gastric cancer invasion were 66.67%, 63.64%and 71.43%, compared with MPR were 86.11%, 86.36%and 85.71%. MPR was significantly higher in diagnosis of gastric cancer whether infringing the serosal or not, and the difference was statistically significant (p < 0.05). Conclusion Multi-detector row spiral CT multi-planar reconstruction (MPR) technique can increase greatly the detection rate of gastric cancer surrounding invasion, improve theaccuracy of the preoperative T staging of gastriccancer.