Fixed-jaw Technique in Volumetric Modulated Arc Therapy Plan for Cervical Cancer Radiotherapy
10.3969/j.issn.1674-9081.2014.02.012
- VernacularTitle:固定铅门尺寸技术在宫颈癌容积调强计划设计中的应用
- Author:
Ting-Tian PANG
1
;
Bo YANG
;
Nan LIU
;
Xia LIU
;
Jie QIU
;
Fu-Quan ZHANG
Author Information
1. 中国医学科学院 北京协和医学院 北京协和医院放射治疗科
- Keywords:
cervical cancer;
volumetric modulated arc therapy;
fixed-jaw technique;
dosimetry
- From:
Medical Journal of Peking Union Medical College Hospital
2014;(2):184-188
- CountryChina
- Language:Chinese
-
Abstract:
Objective To summarize the relationship between the transverse dimension of the target volume and the most optimized X jaw size in volumetric modulated arc therapy ( VMAT) plan for cervical cancer radiother-apy.Methods The VMAT plans were made by modifying X jaw size on CT images in 12 postoperative patients with cervical cancer .On each image , the best X jaw size was identified .The relationship between the best X jaw size and the transverse width of planning target volume ( PTV) was determined .Results The change in the trans-verse dimension of the target volume was accompanied with the changes of the optimized X jaw size .The relation-ship between X jaw size (y) and the PTV's transverse width (x) could be expressed as the following equation: y=-0.0033x2 +0.7132x+3.6322.Conclusions There is a relationship between X jaw size and PTV's transverse width, which can be used for the postoperative VMAT plan design in patients with cervical cancer .
