目的探讨低张灌水螺旋CT扫描对大肠癌的诊断价值。方法对68例经纤维结肠镜或手术病理证实的大肠癌患者的低张水灌肠螺旋CT扫描图像进行分析。结果通过低张灌水法螺旋CT扫描检出了全部68例大肠癌,检出敏感度为100%,大肠癌Dukes改良法分期准确度为82.4%。结论低张灌水螺旋CT检查可以有效地显示大肠癌的部位、大小和形态,能较准确地确定大肠癌的侵犯范围和转移,对大肠癌的术前诊断及肿瘤分期非常有价值。 Objective To investigate the diagnostic value of low-density perfusion spiral CT in the diagnosis of colorectal cancer. Methods 68 cases of colon adenocarcinoma confirmed by colon biopsy or pathology confirmed by low-pressure water enema spiral CT scan images were analyzed. Results All 68 cases of colorectal cancer were detected by low-tension irrigation method and the detection sensitivity was 100%. The staging accuracy of Dukes modified colorectal cancer was 82.4%. Conclusion Low-perfusion irrigation spiral CT examination can effectively display the location, size and shape of colorectal cancer, and can accurately determine the scope and metastasis of colorectal cancer. It is very valuable for the preoperative diagnosis and tumor staging of colorectal cancer.