Particle beam irradiation system
First Claim
1. A particle beam irradiation system comprising:
- an accelerator for producing a charged particle beam to be extracted therefrom;
an irradiation device including a charged particle beam scanner and irradiating the charged particle beam extracted from said accelerator to an exposure position of an irradiation object;
a dose detector for measuring a dose of the charged particle beam irradiated to the exposure position; and
a control unit for receiving the dose measured by said dose detector, and when the sum of a first dose irradiated after output of a beam extraction stop signal with respect to a first exposure position preceding a second exposure position and a second dose irradiated to the second exposure position reaches a setting dose, outputting the beam extraction stop signal to stop the extraction of the charged particle beam irradiated to the second exposure position.
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Accused Products
Abstract
A particle beam irradiation system capable of ensuring a more uniform dose distribution at an irradiation object even when a certain time is required from output of a beam extraction stop signal to the time when extraction of a charged particle beam from an accelerator is actually stopped. The particle beam irradiation system comprises a synchrotron, an irradiation device including scanning magnets and outputting an ion beam extracted from the synchrotron, and a control unit. The control unit stops the output of the ion beam from the irradiation device in accordance with the beam extraction stop signal, controls the scanning magnets to change an exposure position in a state in which the output of the ion beam is stopped, and after the change of the exposure position, starts the output of the ion beam from the irradiation device again. The control unit further outputs a next beam extraction stop signal when an increment of dose integrated from the time of a preceding beam extraction stop signal as a start point reaches a setting dose stored in advance.
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Citations
20 Claims
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1. A particle beam irradiation system comprising:
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an accelerator for producing a charged particle beam to be extracted therefrom; an irradiation device including a charged particle beam scanner and irradiating the charged particle beam extracted from said accelerator to an exposure position of an irradiation object; a dose detector for measuring a dose of the charged particle beam irradiated to the exposure position; and a control unit for receiving the dose measured by said dose detector, and when the sum of a first dose irradiated after output of a beam extraction stop signal with respect to a first exposure position preceding a second exposure position and a second dose irradiated to the second exposure position reaches a setting dose, outputting the beam extraction stop signal to stop the extraction of the charged particle beam irradiated to the second exposure position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A particle beam irradiation system comprising:
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an accelerator for producing a charged particle beam to be extracted therefrom; an irradiation device including a charged particle beam scanner and irradiating the charged particle beam extracted from said accelerator to an exposure position of an irradiation object; a dose detector for measuring a dose of the charged particle beam irradiated to the exposure position; and a control unit for receiving the dose measured by said dose detector, and when an integrated dose for a second exposure position, including a first dose irradiated after output of a beam extraction stop signal with respect to a first exposure position preceding the second exposure position, reaches a setting dose, outputting the beam extraction stop signal to stop the extraction of the charged particle beam irradiated to the second exposure position. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification