[Research on Position Verification of Multi-Leaf Collimator (MLC) and Dose Verification Based on Electronic Portal Imaging Device].

Q4 Medicine 中国医疗器械杂志 Pub Date : 2024-03-30 DOI:10.12455/j.issn.1671-7104.230545

Jianfeng Sui, Jiawei Sun, Kai Xie, Liugang Gao, Tao Lin, Xinye Ni

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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.

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[基于电子门户成像设备的多叶准直器（MLC）位置验证和剂量验证研究]。

目的：使用基于电子门成像装置（EPID）系统的质量控制（QC）系统，在Primus和VenusX加速器上实现多叶准直器（MLC）位置验证和剂量验证功能：方法：用灰度值最大梯度法计算多叶准直器的位置，以评估偏差。使用剂量校准和剂量计算相结合的算法重建 EPID 获取的图像剂量。将 EPID 和二维矩阵（MapCheck/PTW）获得的剂量数据与 Pinnacle/TiGRT TPS 计算的剂量进行比较，以分析 γ 通过率：VenusX MLC 的位置误差小于 1 毫米。Primus MLC 在 EPID 的指导下重新校准后，位置误差明显减小。对于 EPID 重建的剂量，在 3%/3 mm、10% 临界值和 2%/2 mm、10% 临界值的标准下，Primus 的平均 γ 通过率分别为 98.86% 和 91.39%。VenusX的平均γ通过率分别为98.49%和91.11%：基于 EPID 的加速器质量控制系统可以提高加速器质量控制的效率，减少物理学家的工作量。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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