A comparative study of dosimetric verification of HalcyonTM treatment plans using Varian Portal Dosimetry and PTW array 1500
10.3760/cma.j.issn.0254-5098.2019.01.011
- VernacularTitle:瓦里安Portal Dosimetry和PTW 1500矩阵在HalcyonTM治疗计划剂量验证的对比研究
- Author:
Qiaoqiao HU
1
;
Fan JIANG
;
Meijiao WANG
;
Yibao ZHANG
;
Kaining YAO
;
Jian GONG
;
Hao WU
;
Haizhen YUE
Author Information
1. 北京大学肿瘤医院暨北京市肿瘤防治研究所放疗科恶性肿瘤发病机制及转化研究教育部重点实验室 100142
- Keywords:
HalcyonTM accelerator;
Dose;
γ2D analysis;
Electronic portal imaging device
- From:
Chinese Journal of Radiological Medicine and Protection
2019;39(1):58-62
- CountryChina
- Language:Chinese
-
Abstract:
Objective To compare two pretreatment plan QA methods for HalcyonTM accelerator using Portal Dosimetry (PD),and PTW OCTAVIUS 1500 detector array + Octagonal phantom (Oct 1500)respectively.Methods Parallel measurement-based pretreatment QA using two methods was performed for 22 IMRT/VMAT plans (74 fields) that have been used to treat 20 patients recruited in the Halcyon clinical trial.Several γ 2D comparisons were also applied to provide guidelines for Halcyon planning QA.Results Using Oct1500 method,the γ 2D passing rates for 74 fields in 22 Plans were 95.26±3.59,95.01±3.62 (Local Dose),99.05± 1.35,98.57± 1.96 (Max Dose) respectively.Two-related samples non-parametric tests suggested that the differences between the evaluation criteria were of statistical significance (Z =-7.220,-4.108,P＜0.05).For PD method,the γ 2D passing rates were 84.11％ ± 1.35％ (1 mm/1％),99.07％± 1.35％ (2 mm/2％),and 99.86％ ± 1.35％ (3 mm/3％).Two-related samples non-parametric tests suggested that the differences between evaluation criteria of PD method were statistically significant (Z =-7.475,-7.475,-6.906,P＜0.05).For 74 fields and max dose,3 mm/3％ evaluation criteria,two-related samples non-parametric tests suggested that the differences between PD and Oct1500 method were statistically significant (Z=-5.072,P＜0.05).Conclusions Both methods can be used for Halcyon pretreatment plan QA.PD is superior to Oct1500 with respect to efficiency and spatial resolution-induced verification accuracy.The criteria of 2 mm/2％ for PD,and Max Dose/3 mm/3％ for Oct1500 was suggested.
