RESUMEN
Objective To study more reasonable method of radiation barrier for cervical cancer treated with external radiation. Methods The distance from cervical canals to tumor's margin in x axis was measured by B ultrasonic, around uterus were evaluated by physical examination.and the dose around uterus for patient who used fixed lead brick for radiation barrier when treated with external radiation were calculationed by TPS, in 39 case of cervical cancer treated with external radiation combine with intracavitary irradiation. Pay attention to the lower dose area around uterus. Results It might bring about lower dose area around uterus who used fixed lead brick for radiation barrier when treated with external radiation,and mass might be in above area. Conclusion Cervical cancer treated with external radiation with source axial distance (SAD), and radiation barrier with lead brick individuate may help for to avoid the lower dose area around uterus.