Charged particle beam irradiating apparatus
First Claim
1. A charged particle beam irradiating apparatus for continuously irradiating a charged particle beam along an irradiation line in an irradiation field that is set in an object, comprising:
- a scanning electromagnet that scans the charged particle beam; and
a control unit that controls an operation of the scanning electromagnet,wherein the control unit changes a scanning speed when the charged particle beam is irradiated along the irradiation line such that a peripheral portion of a dose distribution of the charged particle beam is corrected,wherein the irradiation line extends in a rectangular wave shape, and includes a plurality of first irradiation lines that are arranged in parallel to each other at predetermined intervals and a plurality of second irradiation lines that connect the ends of adjacent first irradiation lines on one side or the other side, andwherein the control unit controls a scanning speed when the charged particle beam is irradiated along an outermost first irradiation line among the plurality of first irradiation lines to be lower than a scanning speed when the charged particle beam is irradiated along the other first irradiation lines.
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Accused Products
Abstract
The present invention provides a charged particle beam irradiating apparatus capable of simply preventing unevenness or reduction in a peripheral portion of the dose distribution of a charged particle beam.
A charged particle beam irradiating apparatus includes scanning electromagnets that scan a charged particle beam and a control device that controls the operations of the scanning electromagnets. In the charged particle beam irradiating apparatus, the control unit changes a scanning speed when the charged particle beam is irradiated along an irradiation line such that a peripheral portion of the dose distribution of the charged particle beam is corrected.
44 Citations
6 Claims
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1. A charged particle beam irradiating apparatus for continuously irradiating a charged particle beam along an irradiation line in an irradiation field that is set in an object, comprising:
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a scanning electromagnet that scans the charged particle beam; and a control unit that controls an operation of the scanning electromagnet, wherein the control unit changes a scanning speed when the charged particle beam is irradiated along the irradiation line such that a peripheral portion of a dose distribution of the charged particle beam is corrected, wherein the irradiation line extends in a rectangular wave shape, and includes a plurality of first irradiation lines that are arranged in parallel to each other at predetermined intervals and a plurality of second irradiation lines that connect the ends of adjacent first irradiation lines on one side or the other side, and wherein the control unit controls a scanning speed when the charged particle beam is irradiated along an outermost first irradiation line among the plurality of first irradiation lines to be lower than a scanning speed when the charged particle beam is irradiated along the other first irradiation lines. - View Dependent Claims (2, 3)
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4. A charged particle beam irradiating apparatus for continuously irradiating a charged particle beam along an irradiation line in an irradiation field that is set in an object, comprising:
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a scanning electromagnet that scans the charged particle beam; and a control unit that controls an operation of the scanning electromagnet, wherein the control unit changes a scanning speed when the charged particle beam is irradiated along the irradiation line such that a peripheral portion of a dose distribution of the charged particle beam is corrected, and wherein the control unit controls a scanning speed when the charged particle beam is irradiated along the irradiation line in the peripheral portion of the dose distribution to be lower than a scanning speed when the charged particle beam is irradiated along the other irradiation lines. - View Dependent Claims (5, 6)
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Specification