@article{oai:repo.qst.go.jp:00046271,
 author = {Furukawa, Takuji and Inaniwa, Taku and Satou, Shinji and Shirai, Toshiyuki and Takei, Yuka and Takeshita, Eri and Mizushima, Kota and Iwata, Yoshiyuki and Himukai, Takeshi and Mori, Shinichiro and Fukuda, Shigekazu and Minohara, Shinichi and Takada, Eiichi and Murakami, Takeshi and Noda, Kouji and 古川 卓司 and 稲庭 拓 and 佐藤 眞二 and 白井 敏之 and 武井 由佳 and 竹下 英里 and 水島 康太 and 岩田 佳之 and 日向 猛 and 森 慎一郎 and 福田 茂一 and 蓑原 伸一 and 高田 栄一 and 村上 健 and 野田 耕司},
 issue = {11},
 journal = {Medical Physics},
 month = {Oct},
 note = {Purpose: A project to construct a new treatment facility, as an extension of the existing HIMAC facility, has been initiated for the further development of carbon-ion therapy at NIRS. This new treatment facility is equipped with a 3D irradiation system with pencil-beam scanning. The challenge of this project is to realize treatment of a moving target by scanning irradiation. To achieve fast rescanning within an acceptable irradiation time, the authors developed a fast scanning system. Methods: In order to verify the validity of the design and to demonstrate the performance of the fast scanning prior to use in the new treatment facility, a new scanning-irradiation system was developed and installed into the existing HIMAC physics-experiment course. The authors made strong efforts to develop (1) the fast scanning magnet and its power supply, (2) the high-speed control system, and (3) the beam monitoring. The performance of the system including 3D dose conformation was tested by using the carbon beam from the HIMAC accelerator. Results: The performance of the fast scanning system was verified by beam tests. Precision of the scanned beam position was less than perpendicular to 0.5 mm. By cooperating with the planning software, the authors verified the homogeneity of the delivered field within perpendicular to 3% for the 3D delivery. This system took only 20 s to deliver the physical dose of 1 Gy to a spherical target having a diameter of 60 mm with eight rescans. In this test, the average of the spot-staying time was considerably reduced to 154 micro s, while the minimum staying time was 30 micro s. Conclusions: As a result of this study, the authors verified that the new scanning delivery system can produce an accurate 3D dose distribution for the target volume in combination with the planning software.},
 pages = {5672--5682},
 title = {Performance of the NIRS fast scanning system for heavy-ion radiotherapy},
 volume = {37},
 year = {2010}
}