Position Verification of the RADPOS 4-D <i>In-Vivo</i>Dosimetry System

作     者：Ryosuke Kohno Hidenori Yamaguchi Kana Motegi Fumiya Tanaka Tsunemichi Akita Yuki Nagata Kenji Hotta Tomoko Miyagishi Shie Nishioka Takeshi Dohmae Tetsuo Akimoto 

作者机构：Particle Therapy Division National Cancer Center Hospital East Kashiwa Japan Graduate School of Pure and Applied Sciences University of Tsukuba Tsukuba Japan 

出 版 物：《International Journal of Medical Physics, Clinical Engineering and Radiation Oncology》 (医学物理学、临床工程、放射肿瘤学（英文）)

年 卷 期：2015年第4卷第4期

页      面：318-325页

学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学] 

主　　题：RADPOS MOSFET In-Vivo Dosimetry Position Sensor Photon Therapy Proton Beam Therapy 

摘      要：The accuracy of the position measurements obtained by the radiation positioning system (RADPOS) was evaluated under static and dynamic conditions. In the static verifications, the RADPOS was fixed to the treatment couch in a photon treatment room and a proton treatment room, and was translocated with the treatment couch in x, y and z directions. Because the presence of magnetic and/or electrically conductive materials can cause a systematic shift in the measured position by distorting the RADPOS transmitted field, the effect of metals on the performance of the positioning system was also investigated. Dynamic verification was performed using the couch drive and a dynamic anthropomorphic thorax phantom. We thus confirmed the utility of RADPOS as a position sensor to perform in vivo dosimetry.