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Margin expansion for treatment field of volumetric modulated arc therapy for breast cancer
Guo Chenlei, Xu Yingjie, Dai Jianrong
Department of Radiation Oncology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021,China
AbstractObjective We developed a method to expand margin of beam aperture for VMAT treatment planning of breast cancer and evaluated its effectiveness in clinic. Methods An expanded VMAT (E-VMAT) plan for breast cancer using Pinnacle3 9.10 planning system was made. A small tissue-equivalent bolus was added at the middle of the breast surface as part of the target and the VMAT plan was generated with beam aperture automatically expanded. Then the tissue-equivalent bolus was removed and the final dose distribution was calculated. Ten patients with breast cancer undergoing breast conserving surgery were tested. The dosimetrical metrics and delivery efficiency were compared between the E-VMAT plans and the routine VMAT plans. Results On the BEV view, it was observed that in E-VMAT plans the collimator and MLC leaf positions was extended outside the skin along the anterior-posterior direction of the thorax. There were no significant differences in conformity index and homogeneity index of target volume between the two types of plans and the planned delivery efficiency was consistent (P>0.05). Conclusions The method established in this study can automatically generate expansion of VMAT beam apertures and prevent missing of target volume due to respiratory motion and/or setup error of the patient. The method does not require programming skill and available for different treatment planning systems.
Guo Chenlei,Xu Yingjie,Dai Jianrong. Margin expansion for treatment field of volumetric modulated arc therapy for breast cancer[J]. Chinese Journal of Radiation Oncology, 2018, 27(9): 845-849.
Guo Chenlei,Xu Yingjie,Dai Jianrong. Margin expansion for treatment field of volumetric modulated arc therapy for breast cancer[J]. Chinese Journal of Radiation Oncology, 2018, 27(9): 845-849.
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2018, Vol. 27 
