Research on Position Verification of Multi-Leaf Collimator(MLC)and Dose Verification Based on Electronic Portal Imaging Device
10.12455/j.issn.1671-7104.230545
- VernacularTitle:基于电子射野影像系统的光栅位置和剂量验证研究
- Author:
Jianfeng SUI
1
;
Jiawei SUN
;
Kai XIE
;
Liugang GAO
;
Tao LIN
;
Xinye NI
Author Information
1. 南京医科大学附属常州第二人民医院放疗科,常州市,213161;南京医科大学医学物理研究中心,常州市,213161;江苏省医学物理工程研究中心,常州市,213161
- Keywords:
electronic portal imaging device(EPID);
quality control(QC);
multi-leaf collimator(MLC);
dose verification
- From:
Chinese Journal of Medical Instrumentation
2024;48(2):150-155
- CountryChina
- Language:Chinese
-
Abstract:
Objective A quality control(QC)system based on the electronic portal imaging device(EPID)system was used to realize the Multi-Leaf Collimator(MLC)position verification and dose verification functions on Primus and VenusX accelerators.Methods The MLC positions were calculated by the maximum gradient method of gray values to evaluate the deviation.The dose of images acquired by EPID were reconstructed using the algorithm combining dose calibration and dose calculation.The dose data obtained by EPID and two-dimensional matrix(MapCheck/PTW)were compared with the dose calculated by Pinnacle/TiGRT TPS for γ passing rate analysis.Results The position error of VenusX MLC was less than 1 mm.The position error of Primus MLC was significantly reduced after being recalibrated under the instructions of EPID.For the dose reconstructed by EPID,the average γ passing rates of Primus were 98.86%and 91.39%under the criteria of 3%/3 mm,10%threshold and 2%/2 mm,10%threshold,respectively.The average γ passing rates of VenusX were 98.49%and 91.11%,respectively.Conclusion The EPID-based accelerator quality control system can improve the efficiency of accelerator quality control and reduce the workload of physicists.
