宫颈癌是严重威胁妇女健康的一种疾病,也是最多见的恶性肿瘤之一,居我国女性生殖器官恶性肿瘤中首位〔1〕。近年来,对早期的宫颈癌进行手术治疗已获得较好的疗效,但对局部晚期的病人仍以放疗为主要治疗手段,放疗和同步化疗是治疗局部晚期宫颈癌的标准治疗方法。国内许多医院在宫颈癌常规外照射时仍采用低能X射线或同位素60Co治疗,照 Cervical cancer is a serious threat to the health of women, is one of the most common malignant tumors, ranking first in China female genital malignancies 〔1〕. In recent years, the surgical treatment of early cervical cancer has achieved good results, but the treatment of locally advanced patients is still the main radiotherapy treatment, radiotherapy and concurrent chemotherapy is the treatment of locally advanced cervical cancer standard treatment. Many domestic hospitals in the conventional external irradiation of cervical cancer is still using low-energy X-ray or isotope 60Co treatment, according to