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

• 作者: Tianlong Ji Lu Sun Hao Shen Guang Li
• 来源期刊: 中国生物医学工程学报（英文版）
• 年，卷（期）: 2020,（2）
• 所属期刊栏目: Research papers
• 页码范围: 10-16
• 页数: 7页
• 语种: 英文

摘要

Objective To test a quality assurance ( QA) DVS solution-DVS based on a linac electronic field imaging device ( EP-ID) 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 co-incidence of radiation and mechanical, the DVS solution provides more data, including 3D distance. For the flatness / sym-metry property, the DVS solution can display more graphics, but the overall data is less than the ion-chamber matrix solu-tion. The DVS solution can directly obtain the MLC transmission value and quickly and intuitively measure the position ac-curacy 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.