Analyse two kinds of intensity-modulated radiotherapy verification methods comparatively by using the MatriXX
10.3760/cma.j.issn.1004-4221.2013.04.014
- VernacularTitle:MatriXX两种调强放疗剂量验证方法的比较分析
- Author:
Yue DAI
;
Chunhong HU
;
Xiaodong LI
;
Yanyan GUO
- Publication Type:Journal Article
- Keywords:
MatriXX Ionization chamber array;
Dose verification;
Intensity-modulated radiotherapy
- From:
Chinese Journal of Radiation Oncology
2013;(4):312-314
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the MatriXX measurements the dose distributions for each beam in intensity-modulated radiotherapy (IMRT) plans were measured with 0 degree gantry angle and actual gantry position respectively.To discuss whether the two multi-angle synthetic pass rate from the two methods has statistics differences.Methods The dose distributions for each beam in IMRT plans were measured with 0 degree gantry angle and actual gantry position for twelve patients with head and neck tumor respectively.The γ pass rates (according to 3％/3 mm) for each beam under each angle condition was obtained by the comparison between the measured and the calculated dose distributions from the treatment planning system which was treated as the reference distribution.Use the t-test to analyse the actual gantry angle method and use the one factor analysis of variance to analyze the two multi-angle synthetic pass rate from the two methods.Results The γ pass rates of actual gantry angle was found generally declined seemingly compared with 0 degree gantry angle,but differentγ pass rates showed only in 80 °,120°and 240° with98.71％,93.59％(t=2.10,P=0.000),98.15％,93.17％ (t=2.10,P=0.000) and 98.94％,92.85％ (t =2.10,P =0.000) respectively.The γpass rate of multi-angle synthetic was seemingly between methods (98.27％,94.63 ％,F =0.50,P =0.134).Conclusions Two kinds of IMRT verification mode are from two position to validated the IMRT plans dose accuracy,comparatively analysing the conclusions drawn from the two methods can protect accuracy of IMRT plans more comprehensively.
