@article{oai:repo.qst.go.jp:00043836,
 author = {Kitagawa, Atsushi and Muramatsu, Masayuki and Satou, Shinji and Suda, Mitsuru and Noda, Kouji and Kanai, Tatsuaki and 北川 敦志 and 村松 正幸 and 佐藤 眞二 and 須田 充 and 野田 耕司 and 金井 達明},
 journal = {Nuclear Instruments & Methods in Physics Research Section B},
 month = {Nov},
 note = {A rotating gantry has been a popular tool for a radiation cancer therapy. However, the heavy-ion gantry is huge and expensive, because of the higher magnetic rigidity than that of a proton beam. As one of the downsizing methods, the field strength of a wobbling magnet for a uniform lateral-dose distribution should be increased. Since the field strength of the conventional wobbler is limited by an eddy-current effect under an operation frequency of around 50 Hz, we propose a new wobbling technique by rotating a pair of permanent magnets with a high magnetic field of around 2 T. For
carbon-ion therapy, the proposed technique reduces the irradiation-port length considerably to around 2 m from more
than 6 m in the conventional-gantry design.},
 pages = {79--82},
 title = {New medical irradiation technique by the permanent magnet system for the heavy-ion therapy},
 volume = {240},
 year = {2005}
}