直线加速器是用于癌症放射治疗的大型医疗设备。它通过产生x射线和电子线,对病人体内的肿瘤进行直接照射,从而达到消除或减小肿瘤的目的。直线加速器剂量率高,束流稳定,剂量计算准确,治疗时间短,对周围环境污染小,在使用上更加安全,而且对深部肿瘤的疗效更为理想,因此受到各级各类医院的青睐。据统计,2015年我国直线加速器国 Linear accelerators are large medical devices used for cancer radiotherapy. It generates x-rays and electron rays to directly irradiate the tumor in the patient’s body, thereby eliminating or reducing the tumor. The linear accelerator has a high dose rate, beam stability, accurate dose calculation, short treatment time, less pollution to the surrounding environment, more safety in use, and a more ideal therapeutic effect on deep tumors. Therefore, it is favored by various types of hospitals. According to statistics, China’s linear accelerator country in 2015