Charged particle beam irradiation system and charged particle beam extraction method
First Claim
1. A charged particle beam irradiation system comprising:
- an accelerator for accelerating a charged particle beam to be extracted;
an energy adjusting device through which the charged particle beam extracted from said accelerator passes; and
a beam irradiation device for irradiating the charged particle beam having passed through said energy adjusting device to an irradiation target,wherein said energy adjusting device is rotatable and has different axial thicknesses in a rotating direction thereof; and
said charged particle beam irradiation system further comprises a control unit for controlling starting and stopping of extraction of the charged particle beam from said accelerator in accordance with a rotational angle of said energy adjusting device and a dose of the charged particle beam having passed through said energy adjusting device.
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Accused Products
Abstract
A charged particle beam irradiation system and a charged particle beam extraction method which can prevent erroneous irradiation of a charged particle beam in the direction of advance of the charged particle beam. The system and method are featured in stopping supply of an ion beam to one or more of a plurality of angle zones in each of which a target dose is attained, the angle zones being formed by dividing an RMW in a rotating direction thereof, and in allowing the supply of the ion beam to one or more other angle zones in each of which a target dose is not yet attained. The invention can easily adjust beam doses at various positions in an affected part of the patient body in the direction of advance of the ion beam, and can greatly reduce the probability of erroneous irradiation that the beam dose becomes excessive or deficient at the various positions within the affected part of the patient body in the direction of advance of the ion beam.
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Citations
14 Claims
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1. A charged particle beam irradiation system comprising:
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an accelerator for accelerating a charged particle beam to be extracted; an energy adjusting device through which the charged particle beam extracted from said accelerator passes; and a beam irradiation device for irradiating the charged particle beam having passed through said energy adjusting device to an irradiation target, wherein said energy adjusting device is rotatable and has different axial thicknesses in a rotating direction thereof; and said charged particle beam irradiation system further comprises a control unit for controlling starting and stopping of extraction of the charged particle beam from said accelerator in accordance with a rotational angle of said energy adjusting device and a dose of the charged particle beam having passed through said energy adjusting device. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A charged particle beam irradiation system comprising:
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an accelerator for accelerating a charged particle beam to be extracted, said accelerator including an RF knockout unit for beam extraction; an energy adjusting device through which the charged particle beam extracted from said accelerator passes; and a beam irradiation device for irradiating the charged particle beam to an irradiation target, wherein said energy adjusting device is rotatable and has different axial thicknesses in a rotating direction thereof; and said charged particle beam irradiation system further comprises a control unit for controlling starting and stopping of an RF signal applied to said RF knockout unit in accordance with a rotational angle of said energy adjusting device and a dose of the charged particle beam having passed through said energy adjusting device.
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9. A charged particle beam irradiation system comprising:
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an ion source for generating a charged particle beam; an accelerator for accelerating the charged particle beam emitted from said ion source; and a beam irradiation device for irradiating the charged particle beam to an irradiation target, said beam irradiation device including an energy adjusting device through which the charged particle beam extracted from said accelerator passes; wherein said energy adjusting device is rotatable and has different axial thicknesses in a rotating direction thereof; and said charged particle beam irradiation system further comprises a control unit for controlling starting and stopping of extraction of the charged particle beam from said ion source in accordance with a rotational angle of said energy adjusting device and a dose of the charged particle beam having passed through said energy adjusting device.
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10. A charged particle beam irradiation system comprising:
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an accelerator for accelerating the charged particle beam to be extracted; and a beam irradiation device including an energy adjusting device through which the charged particle beam extracted from said accelerator passes, and irradiating the charged particle beam having passed through said energy adjusting device to an irradiation target, wherein said energy adjusting device is rotatable and has different axial thicknesses in a rotating direction thereof; and said charged particle beam irradiation system further comprises a control unit for stopping supply of the charged particle beam to one or more of a plurality of zones in each of which a target dose is attained, said zones being formed by dividing said energy adjusting device in the rotating direction, and for allowing the supply of the charged particle beam to one or more other zones in each of which a target dose is not yet attained. - View Dependent Claims (11, 12)
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13. A charged particle beam extraction method comprising the steps of:
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supplying a charged particle beam extracted from an accelerator to an energy adjusting device which is rotatable and has different axial thicknesses in a rotating direction thereof; and controlling starting and stopping of extraction of the charged particle beam from said accelerator in accordance with a rotational angle of said energy adjusting device and a dose of the charged particle beam having passed through said energy adjusting device.
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14. A charged particle beam extraction method comprising the steps of:
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supplying a charged particle beam extracted from an accelerator to an energy adjusting device which is rotatable and has different axial thicknesses in a rotating direction thereof; and stopping supply of the charged particle beam to one or more of a plurality of zones in each of which a target dose is attained, said zones being formed by dividing said energy adjusting device in the rotating direction, and allowing the supply of the charged particle beam to one or more other zones in each of which a target dose is not yet attained.
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Specification