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目的：探讨食管癌放疗前CT扫描的临床价值。材料与方法：165例食管癌放疗前作了CT扫描，对病变长度、软组织影最大宽度进行了测量，对异常肿大的淋巴结、受侵部位逐一记录。结果：表明病灶越长、软组织影最大宽度平均值比例增大。病变＜5cm，软组织影最大宽度平均值为3．12，5～7cm为4．403．1～9cm为5．09；＞9cm为5．61。淋巴结转移占35．15％，外侵占89．7％，外侵常累及的部位气管占55．15％（91／165）、隆突下占41．12％（68／165）、主动脉弓占29．70％（49／165）降主动脉占41．18％（69／165）、奇静脉窝占15．15％（25／165）、心包占10．30％（7／165）。结论：CT扫描的临床价值在于明确病灶范围，合理设计放射野，CT图像还可直接输入“T．P．S”（TreatmentPlanningSystem）进行放射治疗计划的设计、优化。
Objective: To investigate the clinical value of CT scan before esophageal cancer. Materials and Methods: 165 patients with esophageal cancer were examined by CT before radiotherapy. The length of the lesion and the maximum width of the soft tissue shadow were measured. The lymph nodes and the site of the invasion were recorded one by one. Results: The longer the lesion, the greater the average ratio of the maximum width of the soft tissue shadow. Lesions <5cm, the average maximum soft tissue shadow width of 3.12, 5 ~ 7cm 4.403.1 ~ 9cm was 5.09;> 9cm was 5.61. Lymph node metastasis accounted for 35.15%, and external invasion accounted for 89.7%. Trachea accounted for 55.15% (91/165) of the trachea involved in external invasion, 41.12% (68/165) under the keel, and 29 for aortic arch. .70% (49/165) of the descending aorta accounted for 41.18% (69/165), odd-vessel nested 15.15% (25/165), and pericardium accounted for 10.30% (7/165). Conclusion: The clinical value of CT scan lies in defining the scope of lesions, designing radiation fields rationally, and CT images can also be directly input “T.P.S” (Treatment Planning System) for the design and optimization of radiotherapy planning.