中国医学装备2018，Vol.15Issue(3)：43-47,5.DOI:10.3969/J.ISSN.1672-8270.2018.03.012
兆伏级扇形束CT在头颈部肿瘤放射治疗中的扫描策略研究
A research about scan strategy of MVCT in the radiotherapy of head and neck neoplasm
管秋 1刘楠 1连欣 1李楠 1姜斐 1邱杰 1张福泉1
作者信息
- 1. 中国医学科学院 北京协和医院放疗科 北京 100730
- 折叠
摘要
Abstract
Objective: To discuss the scan condition of megavoltage computed tomography (MVCT) of helical-tomotherapy (HT) in the radiotherapy of head and neck neoplasm. Methods: 11 patients with head and neck neoplasm were enrolled in the research, and different combinations of thickness and range were adopted to implement scan of MVCT. After the image registration of scan and plan was achieved, the deviation value at four directions included of longitudinal (LNG), lateral (LAT), vertical (VRT) and rotational (ROLL) on the registration position were further analyzed. Results: For patients with long planning target volume (PTV), such as nasal pharyngeal cancer (NPC), the differences of two thickness (4mm and 6mm) at four directions (LAT, LNG, VRT and ROLL) were not significant when their scan ranges were same. When the scan ranges were basis of skull-chin and throat-supraclavicular position, respectively, the differences of the registration between two thickness at three directions (LAT, VRT and ROLL) were significant (t=-5.48, t=-2.56, t=-3.82, P<0.05). For other patients with shorter PTV, such as hypophysoma and others, the difference of registration at different scan thickness and range were not significantly. Conclusion: For the patients with long PTV, such as head and neck neoplasm, the wider thickness should be chosen to reduce the scanning time, and the difference of different registration region should be pay more attention. While for the patients with shorter PTV, the narrower thickness should be adopted to enhance image quality so as to easily achieve clinical registration.关键词
螺旋断层放射治疗/扇形束MVCT/图像引导/扫描条件Key words
Helical Tomotherapy/Megavoltage computed tomography/Image-guided radiotherapy(IGRT)/Scan condition分类
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管秋,刘楠,连欣,李楠,姜斐,邱杰,张福泉..兆伏级扇形束CT在头颈部肿瘤放射治疗中的扫描策略研究[J].中国医学装备,2018,15(3):43-47,5.
