中文摘要：

目的通过对某医用电子直线加速器及放射治疗质量保证系统的验证，探讨影响该加速器性能及放射治疗质量保证系统的因素和解决方案。方法对加速器（LINAC）、图像引导系统（IGRT）、放射治疗计划系统（TPS）和多叶准直器（MLC）进行检测，参照相关标准要求进行评价。结果该加速器所测性能指标基本符合国家标准限值要求，合格率为92．3％。放射治疗质量保证系统各项指标虽符合标准要求但还存在一定偏差。结论二维平板电离室对剂量验证和辐射野检测有一定局限性，指型电离室和三维水箱测量精确性更高。IGRT、TPS和MLC对放射治疗质量保证系统的验证至关重要。

英文摘要：

Objective To evaluate the performance of medical accelerator and radiotherapy quality assurance system and discusse the influence factors and solutions. Methods According to some standards, to test the accelerator （LINAC）, image guidance system （IGRT）, radiation treatment planning system （TPS） and multi leaves collimator （MLC） , and then evaluate the results according to the standards. Results The testing results show that the most of performance status of the medical lin- ear accelerator is good, and the qualified rate is 92.3%. Radiotherapy quality assurance system is not perfect. Conclusion The use of 2D fiat chamber has some limitations for the radiation dose verification and wild detection. The accuracy of finger chamber and 3D water tank is higher. IGRT, TPS and MLC are very important for the validation of radiotherapy quality assur- ance system.