Study of feasibility of exchanging intensity-modulated radiotherapy plans after beam matching on two Linacs
10.3760/cma.j.cn113030-20190929-00401
- VernacularTitle:两台直线加速器束流匹配后互换执行调强放疗计划的可行性研究
- Author:
Chunfeng FANG
1
;
Shouping XU
;
Jun HOU
;
Yuanyuan SONG
;
Wei XU
;
Lin CAO
;
Tao YANG
;
Zishen WANG
;
Dong XIE
;
Longlin ZHU
;
Baolin QU
Author Information
1. 河北一洲肿瘤医院放疗科，涿州 072750
- Keywords:
Linacs beam matching;
Intensity-modulated radiation therapy;
Volumetric-modulated arc therapy;
Ionization chamber
- From:
Chinese Journal of Radiation Oncology
2021;30(7):702-706
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To explore the feasibility of the clinical implementation of intensity-modulated radiation therapy (IMRT) and volumetric-modulated arc therapy (VMAT) plans with 6MV photon on two Elekta Linacs (Versa HD and Synergy) after beam matching.Methods:The images of 12 patients with nasopharyngeal carcinoma, central lung cancer and prostate cancer were randomly selected, and the IMRT and VMAT plans were designed. Two different dose tools of ionization chamber and three-dimensional detector ArcCheck were used to verify the individualized radiation treatment of 6MV photon beams on two Linacs and compare the differences.Results:The deviations between the doses of two Linacs (Versa HD and Synergy) measured by the ion chamber and treatment planning system were (0.32±1.32)% and (0.54±1.29)%. The differences of all plans were within the range of ±3%, and the deviations of the point dose between two Linacs were within the range of ±2% with no statistical significance (both P>0.05). The γ analysis of verification using ArcCheck showed that the passing rates of all plans under the 2mm/3% and 3mm/3% with 10% threshold conditions were over 95%, respectively. The average differences between two Linacs were 0.19%(2mm/3%) and 0.09%(3mm/3%). Conclusions:The results of performing IMRT/VMAT plans on two Linacs meet the clinical requirements and the differences between two Linacs are small. Hence, the same plans can be implemented interchangeably on different Linacs.
