中国医学装备2018，Vol.15Issue(4)：50-52,3.DOI:10.3969/J.ISSN.1672-8270.2018.04.013
基于锥形束CT研究头颈部肿瘤调强放射治疗的计划靶区外放边界
A study on the extended margin of planning target volume of intensity modulate radiotherapy for head and neck neoplasm base on CBCT
罗学臣 1李雪南 1沙翔燕 1王婵 1修霞 1李高峰1
作者信息
- 1. 北京医院放射治疗科 国家老年医学中心 北京 100730
- 折叠
摘要
Abstract
Objective: To provide reference data for the extended margins of clinical target volume(CTV) and planning target volume(PTV) by using cone-beam computed tomography(CBCT) to measure and analyze setup error of intensity modulate radiotherapy for head and neck neoplasm. Methods: 21 patients with head and neck neoplasm who received intensity modulate radiotherapy were randomly enrolled in this study. All of patients were immobilized with thermoplastic device, and the on -board imaging system of Varian TrueBeam linear accelerator was used to implement scan of CBCT before they received radiotherapy. After the image was acquired, the setup errors on three directions included right-left(X), anterior-posterior(Y) and up-down(Z) were obtained through compared with location of CT. Besides, the average setup errors of radiotherapy between the first 4 weeks and the 5th-7th weeks was compared. Results: Total of 136 images were obtained from 21 patients, and the setup errors of X, Y and Z were(-0.39±1.33)mm, (-0.29±1.38)mm and (-0.32±1.46)mm, respectively. And the difference of setup errors between the first 4 weeks and the 5th-7th was no significant(Z=-1.05, Z=-2.11, Z=-1.88, P<0.05). Conclusion: The change of setup errors on head and neck neoplasm at the later period of radiotherapy was no obvious. Therefore, the research suggests the extended margins of PTV should be 3.55mm, 3.25 mm and 3.08 mm on the three directions of X, Y and Z, respectively.关键词
头颈部肿瘤/锥形束CT/靶区边界/摆位误差/调强放射治疗/医用直线加速器Key words
Head and neck neoplasm/Cone-beam computed tomography(CBCT)/Margin/Setup error/Intensity modulated radiation therapy(IMRT)/Medical linear accelerator分类
医药卫生引用本文复制引用
罗学臣,李雪南,沙翔燕,王婵,修霞,李高峰..基于锥形束CT研究头颈部肿瘤调强放射治疗的计划靶区外放边界[J].中国医学装备,2018,15(4):50-52,3.
