外挂电动多叶光栅调强放射治疗计划的剂量验证

摘要

Objective:To verify the dose of static and dynamic intensity modulated radiotherapy (IMRT) through 2-dimension ionization chamber matrix after external electrically-driven multi-leaf collimator (MLC) was installed in KB1800 medical linear accelerator. Methods: 40 patients who need receive IMRT were divided into static IMRT group (20cases) and dynamic IMRT group (20cases) as the random number table. The ionization chamber was applied to implement scale dose, and solid water and 2-D ionization chamber matrix was applied to verify dose. Besides, the feasibility of static and dynamic IMRT were compared and researched.Results: The verification results of plane dosage of static IMRT plan and dynamic IMRT plan showed that the passing rates both of them were above 90.0%, and the verification of intensity modulated dosimetry of medical electric linear accelerator KB1800 with external electric MLC was consistent with standard.Conclusion:After the external electrically-driven MLC is installed on the accelerator, the dosage of IMRT can achieve the verification standard, and it can be applied to clinical treatment and can satisfy the requirement of clinical radiotherapy.%目的:用二维电离室矩阵验证KB1800医用直线加速器上安装外挂电动多叶光栅后开展静态调强和动态调强的剂量.方法:采用数表法随机选取40例行调强放射治疗的患者,其中20例患者采用静态调强计划,另20例患者采用动态调强计划,用指形电离室进行剂量刻度,用固体水和二维电离室矩阵进行剂量验证,对静态调强和动态调强放射治疗的可行性进行比较和研究.结果:20例静态调强计划和20例动态调强计划平面剂量验证结果显示通过率均在90.0%以上,且外挂电动多叶光栅的医用电子直线加速器KB1800的调强剂量学验证符合标准.结论:安装挂式电动多叶光栅的加速器,调强放射治疗的剂量能够达到验证标准,可用于临床治疗,满足临床的需要.