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食管癌单纯放射治疗的效果,除其他诸多的因素外,定位的准确与否及病灶在放射野中心轴的偏离,会直接影响射线的剂量分布,而导致治疗效果的降低。我们对在放疗过程中的106例食管癌患者,当肿瘤量达40Gy时,在X线诊断机下对疗前的定位进行复核,结果发现43.4％的病人靶中心在放射野内出现0.5～2cm的左右移位。除15％移位范围在1cm以内不加校正对剂量分布影响不人外,尚有28.3％的病例必须加以校正。这足在食管癌放射治疗中不可忽视的技术问题。
The effect of simple radiotherapy for esophageal cancer, in addition to many other factors, the accuracy of the location and the deviation of the lesion in the central axis of the radiation field will directly affect the radiation dose distribution, resulting in reduced therapeutic effect. In 106 patients with esophageal cancer during radiotherapy, when the tumor volume reached 40 Gy, the pre-treatment positioning under the X-ray diagnosis machine was rechecked. It was found that 43.4% of the patients had 0.5 to 2 cm of the target center in the radiation field. Move left and right. In addition to the 15% displacement range within 1cm without correction, the impact on the dose distribution was not significant, and 28.3% of cases had to be corrected. This is a technical problem that cannot be ignored in the treatment of esophageal cancer.