@article{oai:repo.qst.go.jp:00048999, author = {Furukawa, Takuji and Hara, Yousuke and Mizushima, Kota and Saotome, Naoya and Tansho, Ryohei and Saraya, Yuichi and Inaniwa, Taku and Mori, Shinichiro and Iwata, Yoshiyuki and Shirai, Toshiyuki and Noda, Koji and 古川 卓司 and 原 洋介 and 水島 康太 and 早乙女 直也 and 丹正 亮平 and 皿谷 有一 and 稲庭 拓 and 森 慎一郎 and 岩田 佳之 and 白井 敏之 and 野田 耕司}, issue = {A}, journal = {Nuclear Instruments and Methods in Physics Research B}, month = {Sep}, note = {At Heavy Ion Medical Accelerator in Chiba (HIMAC) in National Institute of Radiological Sciences (NIRS), more than 9000 patients have been successfully treated by carbon ion beams since 1994. The successful results of treatments have led us to construct a new treatment facility equipped with a three-dimensional pencil beam scanning irradiation system, which is one of sophisticated techniques for cancer therapy with high energetic ion beam. This new facility comprises two treatment rooms having fixed beam lines and one treatment room having rotating gantry line. The challenge of this project is to realize treatment of a moving target by scanning irradiation. Thus, to realize this, the development of the fast scanning system is one of the most important issues in this project. After intense commissioning and quality assurance tests, the treatment with scanned ion beam was started in May 2011. After treatment of static target starts, we have developed related technologies. As a result, we can start treatment of moving target and treatment without range shifter plates since 2015. In this paper, the developments of the scanning irradiation system are described.}, pages = {361--367}, title = {Development of NIRS pencil beam scanning system for carbon ion radiotherapy}, volume = {406}, year = {2017} }