| 摘要 |
<p>Provided is a particle beam irradiation system wherein a higher-accuracy dose distribution is given. An irradiation control unit (13) is provided with an energy setting controller (14) for setting the energy of a charged particle beam, a beam scanning controller (16) for controlling a beam scanner (41), and a beam diameter controller (15) for controlling a beam diameter changer (40, 60). The irradiation control unit (13) performs control such that the beam diameter of the charged particle beam is set to a first beam diameter by the beam diameter controller (15), a predetermined region to be irradiated is irradiated with the charged particle beam by scanning the charged particle beam in a stepwise form by the beam scanning controller (16), the beam diameter of the charged particle beam is set to a second beam diameter different from the first beam diameter by the beam diameter controller (15), and a region overlapping with at least part of the predetermined region to be irradiated is irradiated with the charged particle beam by scanning the charged particle beam in a stepwise form by the beam scanning controller (16).</p> |
