Verification of volumetric-modulated arc therapy plan by log-file analysis of linear accelerator
10.3760/cma.j.issn.0254-5098.2012.03.016
- VernacularTitle:利用加速器日志文件验证容积旋转调强放疗计划的可行性
- Author:
Yangguang MA
;
Ke ZHANG
;
Zhihui HU
;
Yixin SONG
;
Jianrong DAI
- Publication Type:Journal Article
- Keywords:
Volumetric modulated are therapy;
Log-file;
Verification of treatment plan
- From:
Chinese Journal of Radiological Medicine and Protection
2012;32(3):285-288
- CountryChina
- Language:Chinese
-
Abstract:
Objective To verify the dose delivery accuracy of volumetric-modulated arc therapy plan by log-file analysis of linear accelerator that can be created when a dynamic delivery occurs.Methods Accelerator log file in binary format recorded the accelerator execution plan for each control point corresponding to the gantry angle,multi-leaf collimator leave position,cumulative machine monitor units ( MU).These information were read from the accelerator log file with Matlab7.1,then the original control points in the plan file replaced the corresponding information for the log,which generated a new plan.New plan was exported into the planning system to reculculate the dose.The volume dose histogram (DVH) and dose distribution was contrasted to determine the accuracy of the accelerator plan of implementation between two plans.Results Compared with the original plan,antry angle difference over ± 1° accounted for about 35％ of the entire arc of control points in 4 of 12 arcs and the percentage of the leave error of ±0.5 mm was about 95％.MU error of a single control point was larger,but the cumulative MU for each are was small which was located between-0.09％ to 0.11％ in the selected 12 arcs.Between the targets,the maximum dose,minimum dose,the mean dose differences were from-0.07％ to 0.42％,-0.38％ to 0.40％,0.03％ to 0.08％,respectively.The maximum dose and mean dose differences of organs at risks were located from-1.16％ to 2.51％,-1.21％ to 3.12％,respectively.Conclusions Accelerator log-file analysis to verify the VMAT plan nan be supplyed to the experimental method supplement.
