Study of Electronic Portal Imaging Device for Dosimetric Verification of Intensity-modulated Radiati

• 作 者: YANGRui-jie;WANGJun-jie;XUFeng;ZHANGXi-le;
• 机 构: Peking University Third Hospital, 100191 Beijing, China
• 出 处: 北京大学医学部近距离放疗研究中心成立大会暨北京大学第三届国际放射肿瘤学术论坛
• 发表日期: 2013年期

　　Purpose: To investigate the feasibility and efficiency of electronic portal imaging device for dosimetric verification of intensity-modulated radiation therapy.Methods: 10 patients treated with intensity-modulated radiation therapy were verified using the electronic portal imaging device of aS 1000from Varian and MatriXX from IBA.The gamma pass rate and time needed was recorded and compared.Results: The gamma pass rate at 3%/3 mm was 95.82% (94.77%-96.86%) and 99.08% (98.72%-99.45%)with aS1000 and MatriXX.The average time needed for dosimetric verification with aS1000 and MatriXX was 12.7 minutes and 47.8 minutes, respectively.Conclusions: The electronic portal imaging device of aS1000 has the potential as a tool for IMRT dosimetric verification.It is more convenient and efficient than MatriXX.