Charged-particle beam irradiation method and system
First Claim
1. A charged-particle beam irradiation method in which while a charged-particle beam ejected from an accelerator is scanned by an electromagnet, each layer resulting from the division of an affected part into a plurality of layers in the direction of progression of said charged-particle beam is irradiated with the charged-particle beam,wherein the intensity of a charged-particle beam for irradiation of a first layer is made lower than the intensity of a charged-particle beam for irradiation of a second layer existing at a position deeper than said first layer in the beam progressing direction, and a scanning speed in said first layer is changed between a portion of said first layer subjected to irradiation at the time of irradiation of said second layer and a portion of said first layer subjected to no irradiation at the time of irradiation of said second layer.
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Accused Products
Abstract
A charged-particle beam irradiation method and system are disclosed in which while a charged-particle beam ejected from an accelerator is scanned by an electromagnet, each layer resulting from the division of an affected part into a plurality of layers in the direction of progression of the charged-particle beam is irradiated with the charged-particle beam. The intensity of a charged-particle beam for irradiation of a first layer is made lower than the intensity of a charged-particle beam for irradiation of a second layer existing at a position deeper than the first layer in the beam progressing direction. A scanning speed in the first layer is changed between a portion of the first layer subjected to irradiation at the time of irradiation of the second layer and a portion of the first layer subjected to no irradiation at the time of irradiation of the second layer.
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Citations
14 Claims
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1. A charged-particle beam irradiation method in which while a charged-particle beam ejected from an accelerator is scanned by an electromagnet, each layer resulting from the division of an affected part into a plurality of layers in the direction of progression of said charged-particle beam is irradiated with the charged-particle beam,
wherein the intensity of a charged-particle beam for irradiation of a first layer is made lower than the intensity of a charged-particle beam for irradiation of a second layer existing at a position deeper than said first layer in the beam progressing direction, and a scanning speed in said first layer is changed between a portion of said first layer subjected to irradiation at the time of irradiation of said second layer and a portion of said first layer subjected to no irradiation at the time of irradiation of said second layer.
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2. A charged-particle beam irradiation method in which while a charged-particle beam ejected from an accelerator is scanned by an electromagnet, each layer resulting from the division of an affected part into a plurality of layers in the direction of progression of said charged-particle beam is irradiated with the charged-particle beam,
wherein the intensity of said charged-particle beam for irradiation of each layer is made lower as the position of that layer becomes shallower in the beam progressing direction, and a scanning speed in a shallower layer is changed between a portion of said shallower layer subjected to irradiation at a flat portion of a charged-particle beam characteristic at the time of irradiation of a deeper layer and a portion of said shallower layer subjected to no irradiation at the time of irradiation of said deeper layer.
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8. A charged-particle beam irradiation system in which while a charged-particle beam ejected from an accelerator is scanned by an electromagnet, each layer resulting from the division of an affected part into a plurality of layers in the direction of progression of said charged-particle beam is irradiated with the charged-particle beam, the system comprising:
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intensity control means for making the intensity of a charged-particle beam for irradiation of a first layer lower than the intensity of a charged-particle beam for irradiation of a second layer existing at a position deeper than said first layer in the beam progressing direction; and
scanning speed changing means for changing a scanning speed in said first layer between a portion of said first layer subjected at the time of irradiation of said second layer and a portion of said first layer subjected to no irradiation at the time of irradiation of said second layer. - View Dependent Claims (10, 11, 12, 13, 14)
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9. A charged-particle beam irradiation system in which while a charged-particle beam ejected from an accelerator is scanned by an electromagnet, each layer resulting from the division of an affected part into a plurality of layers in the direction of progression of said charged-particle beam is irradiated with the charged-particle beam, the system comprising:
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intensity control means for making the intensity of said charged-particle beam for irradiation of each layer lower as the position of that layer becomes shallower in the beam progressing direction; and
scanning speed changing means for changing a scanning speed in a shallower layer between a portion of said shallower layer subjected to irradiation at a flat portion of a charged-particle beam characteristic at the time of irradiation of a deeper layer and a portion of said shallower layer subjected to no irradiation at the time of irradiation of said deeper layer.
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Specification