The application in detection the position accuracy of the multi-leaf collimator of Varian linear accelerator with dynamic therapy log files
10.3760/cma.j.issn.1004-4221.2010.06.021
- VernacularTitle:瓦里安加速器动态治疗日志文件在多叶准直器到位精度检测中的应用研究
- Author:
Changhu LI
;
Liming XU
;
Jianjian TENG
;
Wei GE
;
Jun ZHANG
;
Guangdong MA
- Publication Type:Journal Article
- Keywords:
Dynamic therapy log files;
Multi-leaf collimator;
Position accuracy
- From:
Chinese Journal of Radiation Oncology
2010;19(6):552-554
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explorer the application in detection the position accuracy of the multileaf collimator of Varian accelerator with dynamic therapy log files. Methods A pre-designed MLC format files named PMLC for two Varian accelerators, the dynamic treatment log files were recorded 10 times on a different date, and be converted into the MLC format files named DMLC, compared with the original plan PMLC, so we can analysis two files for each leaf position deviation. In addition, we analysis the repeatability of MLC leaves position accuracy between 10 dynalog files of two accelerators. Results No statistically significant difference between the average position of the 10 times leaf position of the two accelerators,their were 0. 29 -0. 29 and 0. 29 -0. 30(z = -0. 77, P=0. 442). About 40% ,30% ,20% and 10% of the leaf position deviation was at ≤0. 2 mm, 0. 3 mm,0. 5 mm and 0. 4 mm,respectively. the maximum value was 0. 5 mm. More than 86% of the leaf position are completely coincident between 10 dynamic treatment files of two accelerators,The rate of position deviation no more 0. 05 mm was 96. 6% and 97.3%, respectively.And the maximum value was 0. 09 mm. Conclusions Dynamic treatment log file is a splendid tool in testing the actual position of multi-leaf collimator. The multi-leaf collimator of two accelerators be detected are precise and stabilized.
