Analysis of dose accuracy for swapping VMAT plan across 3 Elekta beam-matched linear accelerators(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2022年第9期
- Page:
- 1070-1075
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- Analysis of dose accuracy for swapping VMAT plan across 3 Elekta beam-matched linear accelerators
- Author(s):
- LI Yi1; WU Wenjing2; ZHANG Long1; HE Ruixin1; TANG Fengwen1; LU Yongkai1; ZHANG Yuemei1; YUAN Wei1; CHAI Linyan1; WANG Long1; ZHANG Xiaozhi1
- 1. Department of Radiation Oncology, the First Affiliated Hospital of Xian Jiaotong University, Xian 710061, China 2. Xian Center for Disease Control and Prevention, Xian 710054, China
- Keywords:
- Keywords: linear accelerator beam-matched volumetric modulated arc therapy plan swap execution dose accuracy
- PACS:
- R318；R815
- DOI:
- DOI:10.3969/j.issn.1005-202X.2022.09.003
- Abstract:
- Abstract: Objective To investigate the possibility of swapping volumetric modulated arc therapy (VMAT) plan across 3 beam-matched linear accelerators. Methods Synergy1, Synergy2 and VersaHD were used to generate VMAT plans named PlanSynergy1, PlanSynergy1 and PlanVersaHD for 18 cases with the tumor located in head and neck, chest and abdomen, or pelvis. The same VMAT plan (6 MV X-ray) was executed sequentially on 3 accelerators. The absolute point dose error and relative three-dimensional dose distribution with gamma passing rate (3 mm/3%) measured by ion chamber and Delta4 were compared with the results calculated by treatment planning system for assessing the feasibility of swapping VMAT radiotherapy plan across 3 beam-matched linear accelerators. Results The deviations between measured point dose of PlanSynergy1 executed on 3 accelerators (Synergy1, Synergy2 and VersaHD) and TPS calculation were (-0.27±0.87)%, (-0.88±1.74)% and (0.37±2.18)%, respectively and the comparison between measured relative dose and TPS calculation showed that the gamma passing rates were (99.84±0.31)%, (98.89±1.32)% and (99.16±1.12)%, respectively. For PlanSynergy2, the deviations between measured point dose and TPS calculation were (0.24±1.98)%, (0.15±1.97)% and (-0.09±0.66)%, respectively and the gamma passing rates of relative dose were (98.75±1.38)%, (99.77±0.42)% and (99.41±1.66)%, respectively. For PlanVersaHD, the deviations between measured point dose and TPS calculation were (-0.57±1.07)%, (-0.42±2.10)% and (-1.55±1.62)%, respectively the gamma passing rates of relative dose were (97.79±1.61)%, (98.75±1.37)% and (99.78±0.60)%, respectively. When VMAT plan was swapped across 3 Elekta beam-matched linear accelerators, the point dose deviations were within the range of ±3%, and the gamma passing rate of relative doses were higher than 95%, meeting clinical requirements. Conclusion VMAT plan can be swapped across 3 Elekta linear accelerators after beam match (6 MV X-ray).
Last Update: 2022-09-27