目的　比较研究CT结肠造影术 4种后处理方法检查结直肠癌的临床应用价值。方法用螺旋CT机对 64例结直肠癌病例行容积扫描 ,在工作站应用 4种后处理方法获取多平面重建(multiplanarreformation ,MPR)、CT仿真结肠镜 (CTvirtualcolonoscopy ,CTVC)、表面遮盖显示 (shadedsurfacedisplay ,SSD)和透明显示 (Raysum)图像。分结直肠癌环肠周侵犯程度、长度和分型 3方面比较分析所得结果。病变均经手术和 (或 )常规结肠镜 (conventionalcolonoscopy ,CC)活检病理证实。结果MPR、CTVC、SSD和Raysum对结直肠癌环肠周侵犯程度的判断正确率分别为 10 0 0 %、82 8%、79 7%和 79 7% ,MPR与CTVC之间有显著统计学差异 ;对肿块长度的判断正确率分别为 89 1%、76 6%、95 3 %和 10 0 0 % ,CTVC与SSD之间有统计学差异 ;对肿块分型的判断正确率分别为 81 3 %、92 2 %、71 9%和 71 9% ,CTVC与SSD之间亦有统计学差异。MPR能准确判断肿块环肠周的程度 ;Raysum能比SSD更可靠地显示肿块的长度 ,判断较准确 ;CTVC有助于肿块分型的判断。结论　MPR、CTVC、SSD和Raysum检查结直肠癌各有优缺点 ,4种后处理方法的结合能更全面显示肿块的情况。 Objective To compare the clinical value of four kinds of post-treatment CT colonography in colorectal cancer. Methods Sixty-four patients with colorectal cancer underwent volume scanning with a spiral CT scanner. Four kinds of post-processing methods were used to obtain multiplanar reconstruction (MPR), CT virtual colonoscopy (CTVC), shaded surface display SSD) and Raysum images. Subclavian cystadenocarcinoma of the degree of encroachment, length and type 3 comparative analysis of the results obtained. Lesions were confirmed by surgery and / or conventional colonoscopy (CC) biopsy. Results The accuracy rates of MPR, CTVC, SSD and Raysum in determining the degree of peri-intestinal peritonitis were 100%, 82 8%, 79 7% and 79 7%, respectively. There was a significant difference between MPR and CTVC ; The correct rates of the tumor length were 89 1%, 76 6%, 95 3% and 100 0%, respectively. There was a statistically significant difference between CTVC and SSD. The accuracy of the tumor mass classification was 81 3% , 92 2%, 71 9% and 71 9% respectively. There was also a statistically significant difference between CTVC and SSD. MPR can accurately determine the extent of lump circumcision; Raysum can show the length of lumps more reliably than SSD, and the judgment is more accurate; CTVC can help determine the lump classification. Conclusion MPR, CTVC, SSD and Raysum have the advantages and disadvantages of colorectal cancer examination, and the combination of four kinds of post-treatment methods can more fully display the mass of the tumor.