| 摘要 |
There is provided a particle beam therapy system that can rapidly change beam energy without increasing the size of a deflection electromagnet even in the case where the number of required beam-energy changes is large. There is provided a plurality of beam energy changing units each provided with a beam energy attenuation unit; a beam is deflected in such a way as to sequentially passes through the plurality of beam energy changing units; while a beam passes through one of the beam energy changing unit, the beam energy attenuation amount of another beam energy changing unit is changed.
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