Particle beam irradiation method using depth and lateral direction irradiation field spread and particle beam irradiation apparatus used for the same
First Claim
1. A particle beam irradiation method which uses both a depth direction irradiation field spread for spreading an irradiation field of a particle beam in a depth direction along an irradiation direction of the particle beam, and a lateral direction irradiation field spread for spreading the irradiation field of the particle beam in a lateral direction perpendicular to the irradiation direction of the particle beam, and irradiates the particle beam at an irradiation target, the method comprising:
- superimposing plural irradiation layers having different ranges in the irradiation direction of the particle beam, the depth direction irradiation field spread being an active irradiation field spread;
disposing a bolus having a shape along a deepest part of the irradiation target in the depth direction is disposed to cross the particle beam;
re-irradiating at least one selected irradiation layer selected from the plural irradiation layers one or more times with the particle beam for irradiating a planned irradiation dose of the particle beam for the one selected irradiation layer, the one selected irradiation layer is a deepest irradiation layer among the plural irradiation layers;
detecting a displacement of the irradiation target when the irradiation target is displaced; and
adjusting an irradiation dose of the particle beam according to the displacement of the irradiation target so that the planned irradiation dose of the particle beam for the one selected irradiation layer is obtained, even if the one selected irradiation layer is displaced.
1 Assignment
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Accused Products
Abstract
In a particle beam irradiation method and a particle beam irradiation apparatus in which depth direction irradiation field spread and lateral direction irradiation field spread are performed, an irradiation dose in each of the irradiation layers of an irradiation target is made substantially constant, the control is simplified, and the irradiation error by the displacement of the irradiation target is reduced. The depth direction irradiation field spread is an active irradiation field spread to superimpose plural irradiation layers having different ranges in the irradiation direction of the particle beam. A bolus having a shape along a deepest part of the irradiation target in the depth direction is disposed to cross the particle beam. At least one irradiation layer selected from the plural irradiation layers is re-irradiated one or more times with the particle beam.
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Citations
15 Claims
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1. A particle beam irradiation method which uses both a depth direction irradiation field spread for spreading an irradiation field of a particle beam in a depth direction along an irradiation direction of the particle beam, and a lateral direction irradiation field spread for spreading the irradiation field of the particle beam in a lateral direction perpendicular to the irradiation direction of the particle beam, and irradiates the particle beam at an irradiation target, the method comprising:
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superimposing plural irradiation layers having different ranges in the irradiation direction of the particle beam, the depth direction irradiation field spread being an active irradiation field spread; disposing a bolus having a shape along a deepest part of the irradiation target in the depth direction is disposed to cross the particle beam; re-irradiating at least one selected irradiation layer selected from the plural irradiation layers one or more times with the particle beam for irradiating a planned irradiation dose of the particle beam for the one selected irradiation layer, the one selected irradiation layer is a deepest irradiation layer among the plural irradiation layers; detecting a displacement of the irradiation target when the irradiation target is displaced; and adjusting an irradiation dose of the particle beam according to the displacement of the irradiation target so that the planned irradiation dose of the particle beam for the one selected irradiation layer is obtained, even if the one selected irradiation layer is displaced. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A particle beam irradiation apparatus comprising:
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a particle beam generation part for generating a particle beam; a particle beam transport part for transporting the particle beam generated by the particle beam generation part; a particle beam irradiation part for irradiating the particle beam transported by the particle beam transport part at an irradiation target; depth direction irradiation field spread means for spreading an irradiation field of the particle beam in a depth direction along an irradiation direction of the particle beam; lateral direction irradiation field spread means for spreading the irradiation field of the particle beam in a lateral direction perpendicular to the irradiation direction of the particle beam, wherein the depth direction irradiation field spread means is an active depth direction irradiation field spread means for superimposing plural irradiation layers having different ranges in the irradiation direction of the particle beam, and wherein the particle beam irradiation apparatus further comprises; a bolus having a shape along a deepest part of the irradiation target in the depth direction is disposed to cross the particle beam; means for re-irradiating the particle beam to at least one selected irradiation layer selected from the plural irradiation layers one or more times with the particle beam for irradiating a planned irradiation dose of the particle beam for the one selected irradiation layer, the one selected irradiation layer is a deepest irradiation layer among the plural irradiation layers; displacement detection means for detecting a displacement of the irradiation target; and adjustment means for adjusting an irradiation dose of the particle beam according to the displacement of the irradiation target so that the planned irradiation dose of the particle beam for the one selected irradiation layer is obtained, even if the one selected irradiation layer is displaced. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification