摘要
目的:探讨调强放疗保护N0鼻咽癌患者颌下腺的可行性。方法:选择N0鼻咽癌患者10例,对每个病例分别制定保护颌下腺的调强放疗计划(计划A)和不保护颌下腺的调强放疗计划(计划B),比较两种计划的颌下腺、靶区和正常组织/危及器官的剂量分布、剂量体积直方图(DVH)等指标。结果:计划A和计划B相比,前者明显降低了颌下腺的照射剂量:左侧颌下腺D50分别为50.88Gy和30.96Gy,降低了19.92Gy(39.15%),D平均分别为50.27Gy和31.16Gy,降低了19.11Gy(38.01%);右侧颌下腺D50分别为50.71Gy和31.27Gy,降低了19.44Gy(38.34%),D平均分别为49.79Gy和31.73Gy,降低了18.06Gy(36.27%)。两种计划中靶区剂量无明显差别:GTV的D99分别为67.29Gy和67.62Gy,GTV的D95分别为69.59Gy和69.22Gy,GTV的D1分别为73.64Gy和73.64Gy,GTV的Daverage分别为71.21Gy和70.92Gy,GTV的Dmin分别为66.95Gy和66.79Gy;CTV1的D95分别为63.12Gy和63.32Gy,CTV1的Daverage分别为67.62Gy和67.29Gy,CTV1的Dmin分别为56.94Gy和56.45Gy;CTV2的D95分别为54.35Gy和54.65Gy,CTV2的Daverage分别为61.03Gy和60.83Gy,CTV2的Dmin分别为42.62Gy和42.72Gy。脑干的D1和D5、脊髓的D1、颞叶D5、颞颌关节的D50、腮腺的D50及D平均剂量两种计划比较差别不明显。结论:利用调强放疗可以安全有效地保护N0鼻咽癌患者的颌下腺,从而有可能进一步降低患者的口干症状。
Objective:To explore the feasibility of sparing the submandibular glands by intensity modulated radiotherapy in the treatment of N0 neck nasopharyngeal carcinoma.Methods:Ten patients with N0 neck nasopharyngeal carcinoma were selected.Two IMRT plans were designed for each patient.Plan A:sparing submandibular glands;Plan B:non-sparing submandibular glands.The dose distribution and dose volume histograph(DVH) of submandibular glands ,target and organs at risk(OAR) of two IMRT plans were compared.Results:The D50 to the left submandibular gland were 50.88Gy and 30.96Gy respectively in the plan A and plan B and to the right submandibular gland were 50.71Gy and 31.27Gy respectively.The arerage dose to the left submandibular gland were 50.27Gy and 31.16Gy respectively in the plan A and plan B and the right submandibular gland were 49.79Gy and 31.73Gy respectively.Plan A showed 39.15% and 38.34% decrease of D50 to the left and right submandibular gland and 38.01% and 36.27% decrease of arerage dose to the left and right submandibular gland.There were little difference in target's D99,D95,D1,Daverage and Dmin.Also there were little difference in the D1/D5/D50/Daverage of organs at risk(OAR).Conclusion:Submandibular gland sparing with IMRT is safe and effective in the treatment of N0 neck nasopharyngeal carcinoma and decrease the degree of radiation-associated xerostomia.
出处
《现代肿瘤医学》
CAS
2010年第9期1723-1726,共4页
Journal of Modern Oncology
关键词
鼻咽癌
调强放疗
颌下腺
nasopharyngeal carcinoma
intensity modulated radiotherapy
submandibular gland