Comparison of three dose verification methods in intensity modulated radiation therapy using PTW Detector729
10.19745/j.1003-8868.2024093
- VernacularTitle:PTW Detector729 3种剂量验证方法在调强放射治疗中的对比研究
- Author:
Xiao-Hui WU
1
;
Zu-Wen YAO
;
Shan-Shan XU
;
Tao-Hong LUO
;
Xiao-Rong HU
;
Yang YAO
;
Xiao-Hua WANG
Author Information
1. 遂宁市中心医院肿瘤中心放射治疗科,四川遂宁 629018
- Keywords:
PTW Detector729;
2D ionization chamber matrix;
dose verification;
γ pass rate;
intensity modulated radiation therapy
- From:
Chinese Medical Equipment Journal
2024;45(5):56-59
- CountryChina
- Language:Chinese
-
Abstract:
Objective To compare the three methods in intensity modulated radiation therapy(IMRT)dose verification using PTW Detector729.Methods A total of 50 patients with nasopharyngeal cancer,lung cancer,breast cancer,cervical cancer and whole brain radiation therapy who completed radiation treatment at some hospital from January to December 2022 were selected retrospectively.Two-dimensional(zero and actual gantry angles)and three-dimensional dose verifications were carried out for the IMRT plans using PTW Detector729 2D ionization chamber matrix combined with PTW RW3 solid water and PTW Ocavius 4D rotation unit.The dose assessment threshold was set to 10％,and the γ pass rates of the three verification methods were counted under four assessment criteria,namely 3％/1 mm,2％/2 mm,3％/2 mm and 3％/3 mm.SPSS 22.0 statistical software was used for data analysis.Results Under the 10％dose assessment threshold criterion,zero-gantry-angle 2D dose verification had the highest γ pass rate,and the differences were statistically significant(P＜0.05);actual-gantry-angle 2D dose verification had the γ pass rate higher than that of 3D verification,and the differences were statistically significant(P＜0.05).The γ pass rates of the three verification methods gradually increased under four criteria,namely,3％/1 mm,2％/2 mm,3％/2 mm and 3％/3 mm,and exceeded 90％under the 3％/2 mm criterion,and the results met the requirements of clinical radiotherapy.Conclusion The results of the three verification methods satisfy the requirements of the IMRT dose verification practice guidelines,and the selection of appropriate verification methods is of great significance to ensure the implementation of the treatment plan.[Chinese Medical Equipment Journal,2024,45(5):56-59]
