高剂量率腔内后装治疗与体外照射相结合是治疗宫颈癌的有效手段。但是，由于子宫在盆腔内的位置多数偏离中线以及外照射采用中线遮挡照射造成盆腔内剂量很不均匀［l］。据报道宫颈癌复发率18．l％，其中中央型复发即宫颈、宫体、阴道复发占29．7％［‘］，国外报道33％。由于宫 High-dose rate intracavitary after-treatment combined with in vitro irradiation is an effective means of treatment of cervical cancer. However, due to the position of the uterus in the pelvic most deviate from the midline and external exposure occluded by midline occlusion caused by a very uneven dose within the pelvis [1]. Cervical cancer is reported to have a recurrence rate of 18%. l%, of which the central recurrence of the cervix, uterus, vaginal recurrence accounted for 29.7% [’], 33% of foreign reports. Due to the palace