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Case Study of Performance Testing Method for An Intensity Modulated Radiation Therapy Treatment Planning System Named RayStation

Q Wu

Q Wu1*, X Zhang2, X Yang3, W Yan3, G Li1, (1) Department of Radiation Oncology, Beijing Hospital, Ministry of Health, Beijing 100730, China (2) Beijing Institute of Medical Device Testing, Beijing 101111, China (3) Beijing Kanglida Trading Corp., Beijing 100089, China

SU-E-T-398 Sunday 3:00PM - 6:00PM Room: Exhibit Hall

Purpose: Referring to the Standard of the Pharmaceutical Industry of the People's Republic of China "Performance and test methods for intensity modulated radiation therapy(IMRT) treatment planning system", we will do a series of tests to an IMRT planning system named RayStation, before its registration and certification.

Methods: The Standard is put forward by the state food and drug administration(SFDA) of China, and adapted from AAPM TG119 report. Referring to the Standard, the tests include: dose goals used for planning, point dose calculation accuracy and dose distribution calculation accuracy. And test phantoms include: AAPM TG119 report's test cases and solid water phantom for verification, and IMRT test cases include: multitarget, mock prostate, mock head/neck and CShape(easier version and harder version) and so on. Referring to the Standard, we optimize and calculate doses of interest in RayStation, and use the common measurement equipments and tools, such as an ionization chamber, films, a detector array, and etc, to measure the doses on the accelerator, then calculate and analyze the errors between them.

Results: The results of dose goals for five different mock plans meet well with the requirements of the Standard. And the point dose ionization chamber measurements are in line with the requirements of the Standard, and the total error of the mock plans is (0.83 ± 1.65)%. The gamma criteria pass rates of per-field measurements using detector array are all greater than 99.0%, and the pass rates of composite film measurements are all greater than 92.5%.

Conclusion: This study has done a set of tests to IMRT performance of RayStation, and the results of three trials are in full compliance with the requirements of the Standard. The test method can also be reference for the user commissioning of IMRT treatment planning system and IMRT clinical dosimetric verification.

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