Application of a Quality Assurance Solution Based on an Electronic Field Imaging Device in Linac

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Abstract Objective To test a quality assurance (QA) DVS solution-DVS based on a linac electronic field imaging device (EPID) and evaluate its accuracy and ease of use. Methods All of the QA items that do not require the dedicated QA phantom in the DVS solution were tested. Test methods were chosen based on the test items: for the collimator rotation center, the coincidence of the radiation and mechanical, mechanical flatness/symmetry and MLC transmission were compared with the existing QA solution; for the leaf position accuracy and repeatability, the original preset beam fields and fields adjusted by 1 mm were compared. Results The collimator rotation center by the DVS solution is similar to the existing solution. For coincidence of radiation and mechanical, the DVS solution provides more data, including 3D distance. For the flatness / symmetry property, the DVS solution can display more graphics, but the overall data is less than the ion-chamber matrix solution. The DVS solution can directly obtain the MLC transmission value and quickly and intuitively measure the position accuracy of the MLC. However, the repeatability is slightly worse. Conclusion The DVS solution can improve the QA work efficiency and reduce workload, and there are more opportunities for improvement.

Key words： Linac QA Electronic field imaging device Multi-leaf collimator Flatness Symmetry Radiation center

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	Articles by authors
	Tianlong Ji
	Lu Sun
	Hao Shen
	Guang Li

Cite this article:

Tianlong Ji,Lu Sun,Hao Shen, et al. Application of a Quality Assurance Solution Based on an Electronic Field Imaging Device in Linac[J]. Chinese Journal of Biomedical Engineering, 2020, 29(2): 10-16.

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http://manu32.magtech.com.cn/Jwk_zgswyx_en/EN/ OR http://manu32.magtech.com.cn/Jwk_zgswyx_en/EN/Y2020/V29/I2/10

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