| 摘要 |
PROBLEM TO BE SOLVED: To obtain a dose distribution of a favorable precision by a double scatterer entering method over a short period of time, and adjust the dose distribution in real time even during a medical treatment irradiation. SOLUTION: This beam axis-adjusting device 22 is equipped with a beam location detector 26, steering electromagnets 24X and 24Y or a deflecting electromagnet (27). In this case, the beam location detector 26 is provided in a beam transport system of a charged particle system. The steering electromagnets 24X and 24Y or the deflecting electromagnet (27) are provided on the entering side. By such a beam axis-adjusting device 22, the precision of the beam axis is guaranteed, and a flat dose distribution is ensured by precisely adjusting the location of a second scatterer 20B based on the measurement result of a monitor 20D of the dose distribution.
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