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目的：探讨CT直接冠状面扫描在直肠癌诊断和分期中的价值。材料和方法：对13例直肠病变的病例行横断面加直接冠状面扫描。在直接冠状面扫描时，应尽量提高KV及mA，并对所获图像进行后处理。结果：本组13例，直肠癌11例，腺病及炎性改变各1例。总的诊断符合率为84．6％，其中按照Duke改良法分期，Ⅰ期诊断符合率为50％，Ⅱ期为67％，Ⅲ期及Ⅳ期为100％。CT显示直肠病灶的关键在于充分扩张的肠腔和肠腔内外良好对比。CT直接冠状面扫描可以准确显示病灶范围及与周围脏器的关系，并可以直接测量肿块距肛缘的距离，浆膜层和肠周脂肪受侵犯时表现为索条状或片状致密影，其中肠壁外结节影为浆膜层受累的可靠征象。结论：CT直接冠状面扫描结合横断面扫描对直肠癌诊断和术前分期有帮助。
Objective: To investigate the value of CT direct coronal scan in the diagnosis and staging of rectal cancer. Materials and Methods: Thirteen patients with rectal lesions were examined by cross-sectional plus coronal scan. In direct coronal scanning, KV and mA should be increased as much as possible and the resulting image should be post-processed. Results: The group of 13 cases, 11 cases of rectal cancer, adenosis and inflammatory changes in 1 case. The overall diagnostic coincidence rate was 84.6%. According to the Dukes modified method, the coincidence rate of stage Ⅰ diagnosis was 50%, stage Ⅱ 67%, stage Ⅲ and stage Ⅳ 100%. CT shows the key to rectal lesions is the full expansion of the intestine and intestine good contrast. CT direct coronal scan can accurately show the extent of the lesion and the relationship with the surrounding organs, and can directly measure the distance from the anal verge of the tumor, the serosa and perioral fat when the performance of the cable strip or sheet-like compact shadow, Including intestinal wall nodules shadow Serosal involvement of the reliable signs. Conclusion: CT direct coronal scan combined with cross-sectional scan is helpful for the diagnosis and preoperative staging of rectal cancer.