中晚期食管癌患者 ,他们在术前、术后和化疗、放疗过程中 ,临床上常需要不断地对病变进行Ｘ射线钡餐造影点片复查 ,在保证Ｘ射线点片质量的基础上 ,为使工作者在点片时尽可能地少接受Ｘ射线照射 ,自 1988年以来 ,我们对受检的食管癌患者 ,利用Ｘ射线透视机控制台上的交换开关 , In patients with advanced esophageal cancer, in the preoperative and postoperative period as well as in the course of chemotherapy and radiotherapy, it is often necessary to continuously review the lesions with X-ray barium meal imaging, in order to ensure the quality of X-ray spotting films. Workers receive as little X-ray exposure as possible when they are spotted. Since 1988, we have used switches on X-ray fluoroscope consoles for patients with esophageal cancer being examined.