目的 :研究双体位CT扫描在进展期胃癌分期中的作用。方法 :将 85例进展期胃癌病例分成二组 :单体位组 (即单纯行仰卧位CT扫描 ) 30例 ,双体位组 (即采用仰卧位与补充体位行CT扫描 ) 5 5例。口服水作对比剂行CT检查 ,分别行术前CT分期与手术结果的比较和分析。结果 :双体位组术前分期的准确性为 89.0 9% ,单体位组仅为 6 0 %。两组间有显著差异 (Ρ <0 .0 5 )。结论 :双体位CT在对检出病变、确定病变范围和判断肿瘤对毗邻器官的侵犯方面明显优于单体位组 ,因此双体位CT有助于提高进展期胃癌CT分期的准确性 Objective: To study the role of biphasic CT scan in the staging of advanced gastric cancer. Methods: Totally 85 patients with advanced gastric cancer were divided into two groups: single unit group (ie simple supine position CT scan) 30 cases, bi-position group (using supine position and complement position CT scan) 55 cases. Oral water contrast agent CT examination, respectively, preoperative CT staging and surgical results were compared and analyzed. Results: The accuracy of preoperative staging was 89.0% in the bisexual group and 60% in the monopolar group. There was a significant difference between the two groups (P <0.05). Conclusion: Bi-position CT is superior to monosomic group in detecting lesion, determining the extent of lesion and judging the tumor invasion to adjacent organs. Therefore, bi-position CT is helpful to improve the accuracy of CT staging in advanced gastric cancer