【摘要】 肿瘤的放射治疗中,为了检测治疗设备的性能以及确保放疗计划实施的可靠性和准确性,必须具备完善的质量保证体系(Quality Assurance,QA).本文研究将德国PTW公司研发的二维电离室矩阵Seven29应用到放疗的日常QA过程中,使用Seven29和与之配套的八角体模或平板体模来测量剂量分布图,并与治疗计划系统计算出来的剂量分布图进行比较.对治疗设备每月的QA,最重要的项目是检测射线性能的连续性,检测方法是对连续两个月机器性能的参数进行比较.采用PTW公司的软件Veri Soft和Multi Check进行数据分析,经大量的实验验证和比较,结果表明二维电离室矩阵是剂量测量和分析的有效工具,其精度高、可靠性强、使用方便,是实现无胶片化和无纸化放疗体系的重要组成部分.更多还原

【Abstract】 The Quality Assurance(QA)in the treatment of malignant diseases is highly required in the processes of peri-odical machine performance evaluation and patient-specific dose distribution verification for the safe and accurate radia-tion therapy. This study aims to evaluate the performance of the PTW ion chamber array Seven29 in routine QA proce-dures. The method for the study is to use Seven29 with the dedicated Octavius phantom and slab phantom in the dosedistribution measurement for the verification of the dose map computation on the treatment planning systems. PTW soft-ware Veri Soft and Multi Check are used for the analysis. Beam profile consistency check,one of the most important itemsfor LINAC monthly QA,can be directly evaluated between two consecutive months. Ion chamber array has proven to bean accurate,reliable and efficient physics gadget for various dosimetry verification procedures. It is one of the essentialcomponents of a paperless and filmless radiation therapy facility.更多还原