| 摘要 |
<p>The objective of the present invention is to provide a particle radiotherapy device which does not require too much space between a scanning electromagnet and a subject being irradiated, and for which a ridge filter that can be easily produced can be used. This particle radiotherapy device comprises an irradiation unit (18) which further comprises a scanning electromagnet (5) for scanning a particle beam that proceeds inside a vacuum duct (4) and irradiating a subject with the particle beam and a beam extraction window (7a, 7b) for extracting the particle beam from the vacuum duct into the air, wherein the irradiation unit is constituted such that the vacuum duct is separably provided at a flange surface (47) more toward the side of the subject being irradiated than the scanning electromagnet, and when a scanning type irradiation vacuum duct (6) provided more toward the side of the subject being irradiated than the flange surface is moved so as not to overlap a beam line (1) of the particle beam, a ridge filter (42) for broad beam irradiation can be mounted in the space which is on the beam line of the particle beam and in which the scanning type irradiation vacuum duct was provided before being moved.</p> |
