Abstract: Background and purpose: The quality assurance (QA) of radiation therapy plays an important role in the precise tumor radiotherapy. This study was to report the accelerator QA experience of joining the Radiation Therapy Oncology Group (RTOG). Methods: The QA protocols and the report forms were customized by following the RTOG requirements. The daily, monthly and annual quality assurance items were created according to the American Association of Physicists in Medicine (AAPM) TG40 and AAPM TG142. Each senior physicist was response for the QA of two accelerators due to the limited physicists. The daily QA was carried out by the physicists and therapists in the morning, and the monthly QA and annual QA were performed at weekends. The results of daily, monthly and annual QAs were filled in the electronic form. Results: The standardized QA protocols were established and strictly followed. The QA results of radiotherapy were digitized, which directly showed the accelerator QA status. Conclusion: The standardized radiotherapy QA protocols should be established and implemented, and it is worth spreading widely in clinics.

Key words: Radiation Therapy Oncology Group, Radiological Physics Center, American Association of Physicists in Medicine, Radiotherapy, Quality assurance