Particle beam irradiation system and method of adjusting irradiation field forming apparatus
First Claim
1. A particle beam irradiation system comprising a charged particle beam generator and an irradiation field forming apparatus for irradiating a charged particle beam extracted from said charged particle beam generator to an irradiation target, said irradiation field forming apparatus comprising a Bragg peak spreading-out device for spreading out a Bragg peak of the charged particle beam, and a scattering compensator provided on said Bragg peak spreading-out device and compensating differences in scattering intensity of the charged particle beam in said Bragg peak spreading-out device, said Bragg peak spreading-out device and said scattering compensator being mounted in said irradiation field forming apparatus movably in a direction of advance of the charged particle beam.
1 Assignment
0 Petitions
Accused Products
Abstract
A particle therapy system, as one example of a particle beam irradiation system, comprises a charged particle beam generator and an irradiation field forming apparatus. An ion beam from the charged particle beam generator is irradiated to a diseased part in the body of a patient through the irradiation field forming apparatus. A scattering compensator and a range modulation wheel (RMW) are disposed on the upstream side in a direction of beam advance and are movable along a beam axis. The movement of the scattering compensator and the RMW adjusts a size of the ion beam entering a scatterer device, whereby a change in scattering intensity of the ion beam in the scatterer device is adjusted. As a result, a penumbra in dose distribution is reduced and a more uniform dose distribution in a direction perpendicular to the direction of beam advance is obtained in the diseased part.
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Citations
18 Claims
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1. A particle beam irradiation system comprising a charged particle beam generator and an irradiation field forming apparatus for irradiating a charged particle beam extracted from said charged particle beam generator to an irradiation target,
said irradiation field forming apparatus comprising a Bragg peak spreading-out device for spreading out a Bragg peak of the charged particle beam, and a scattering compensator provided on said Bragg peak spreading-out device and compensating differences in scattering intensity of the charged particle beam in said Bragg peak spreading-out device, said Bragg peak spreading-out device and said scattering compensator being mounted in said irradiation field forming apparatus movably in a direction of advance of the charged particle beam.
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3. A particle beam irradiation system comprising a charged particle beam generator and an irradiation field forming apparatus for irradiating a charged particle beam extracted from said charged particle beam generator to an irradiation target,
said irradiation field forming apparatus comprising a Bragg peak spreading-out device for spreading out a Bragg peak of the charged particle beam, a scattering compensator provided on said Bragg peak spreading-out device and compensating differences in scattering intensity of the charged particle beam in said Bragg peak spreading-out device, a scatterer device through which the charged particle beam passes, and a range adjusting device for changing a range of the charged particle beam, at least one of said Bragg peak spreading-out device and said scattering compensator being mounted in said irradiation field forming apparatus movably in a direction of advance of the charged particle beam.
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10. An irradiation field forming apparatus for irradiating a charged particle beam extracted from a charged partide beam generator to an irradiation target,
wherein said irradiation field forming apparatus comprises a Bragg peak spreading-out device for spreading out a Bragg peak of the charged particle beam, and a scattering compensator provided on said Bragg peak spreading-out device and compensating differences in scattering intensity of the charged particle beam in said Bragg peak spreading-out device, said Bragg peak spreading-out device and said scattering compensator being mounted movably in a direction of advance of the charged particle beam.
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11-14. -14. (canceled)
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18-19. -19. (canceled)
Specification