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目的探讨采用CMSXIO4.64制定宫颈癌调强计划时,调整多叶准直器角度对该计划的影响。方法随机选取10例宫颈癌患者,在其他参数一样的条件下,采用系统默认的0度角为对照组,调整角度为观察组,依据此2种方案制定计划。在满足临床靶区要求的条件下,比较其小肠、膀胱、直肠的受照剂量和总子野数、机器跳数。结果观察组在直肠、膀胱的受照剂量以及总子野数和机器跳数上相对于对照组均有一定优势。结论晚期宫颈癌因侵犯较严重,靶区和危及器官剂量无法同时满足时,采用此方法一定程度上可以减少直肠和膀胱的受照剂量。
Objective To investigate the effect of adjusting the angle of multi-leaf collimator on the planning of cervical cancer IMRT using CMSXIO4.64. Methods Ten patients with cervical cancer were randomly selected. Under the same conditions of other parameters, the default 0 degree angle of the system was used as the control group, the angle of adjustment was the observation group, and the plans were made according to the two schemes. Under the conditions of meeting the requirements of clinical target areas, compared with the dose of the small intestine, bladder and rectum, the total number of subfields and the number of machine hops. Results In the observation group, the dose of rectum and bladder, as well as the total number of subfields and the number of machine hops, had some advantages compared with the control group. Conclusions When the late stage of cervical cancer is infested severely and the dosage of target area and endangered organ can not be satisfied at the same time, this method can reduce the doses of rectum and bladder to some extent.