Patent ID: 7173264

Claim:
A particle beam therapy system comprising: a charged particle beam generator for emitting a charged particle beam; a plurality of treatment rooms in each of which an irradiation unit for irradiating the charged particle beam is disposed; a first beam transport system connected to said charged particle beam generator and transporting the charged particle beam emitted from said charged particle beam generator; a plurality of second beam transport systems provided respectively corresponding to said treatment rooms, connected to said first beam transport system, and transporting the charged particle beam transported through said first beam transport system to the corresponding irradiation units mounted to rotating gantries disposed in said treatment rooms; a path switching device disposed at each of junctions between a beam path in said first beam transport system and beam paths in said plurality of second beam transport systems, and switching the beam path in which the charged particle beam is introduced; a plurality of first shutters provided respectively in said plurality of second beam transport systems downstream of said path switching devices in the direction of advance of the charged particle beam, and shutting off the beam path in the corresponding second beam transport system; and a shutter controller for controlling said first shutter to be open, which is provided in the second beam transport system introducing the charged particle beam to selected one of said plurality of treatment rooms; wherein said irradiation units disposed in said plurality of treatment rooms are each provided with a dose detector for detecting radiation dose produced by the charged particle beam, and said shutter controller controls the open first shutter into a closed state when the radiation dose detected by the dose detector provided in the selected treatment room reaches a dose setting value.