PARTICLE BEAM IRRADIATION APPARATUS
First Claim
1. A particle beam irradiation apparatus that includes:
- a scanning apparatus deflecting a particle beam in a two X-Y directions perpendicular to a traveling direction of the particle beam, to scan the particle beam two-dimensionally over irradiation positions in an irradiation target to be irradiate with the particle beam;
a memory that stores position information on the irradiation positions, information on a dose to be administered to each irradiation position, and information on scan speed of the scanning apparatus;
a controller that controls the scanning apparatus; and
a dose monitor that measures a dose of the particle beam,wherein the controller controls the scanning apparatus so that each irradiation position in the irradiation target are irradiated with the particle beam a rescan-count number of times by repeating for the rescan-count number of times the irradiation of all irradiation positions in a two-dimensional X-Y plane by repeating scan-shifting of the particle beam to a next irradiation position without interrupting the irradiation with the particle beam after a dose measured with the dose monitor reaches a dose calculated on the basis of the dose to be administered to a current irradiation position, stored in the memory,the particle beam irradiation apparatus comprising;
a calculator that receives either one of a rescan count n or a beam intensity J that is a dose of the particle beam per unit time, to calculate a maximum value of the other satisfying the following conditional expression (P1) for all irradiation positions to present the maximum value to a user,
J*ti≦
di/n
(P1),where i is an irradiation position number;
ti is a time for the particle beam to be scan-shifted from an irradiation position i−
1 to an irradiation position i, calculated from the scan speed information and the position information stored in the memory; and
di is a dose to be administered to the irradiation position i, stored in the memory.
1 Assignment
0 Petitions
Accused Products
Abstract
In a particle beam irradiation apparatus that controls a scanning apparatus so that each irradiation position is irradiated with a particle beam a rescan-count number of times by repeating for the rescan-count number of times the irradiation of all irradiation positions in the irradiation target, the irradiation apparatus includes a calculator that receives either one of a rescan count n or a beam intensity J that is a particle beam dose per unit time, to calculate a maximum value of the other satisfying the following conditional expression (P1) for all irradiation positions to present the maximum value to a user.
J*ti≦di/n (P1)
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Citations
3 Claims
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1. A particle beam irradiation apparatus that includes:
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a scanning apparatus deflecting a particle beam in a two X-Y directions perpendicular to a traveling direction of the particle beam, to scan the particle beam two-dimensionally over irradiation positions in an irradiation target to be irradiate with the particle beam; a memory that stores position information on the irradiation positions, information on a dose to be administered to each irradiation position, and information on scan speed of the scanning apparatus; a controller that controls the scanning apparatus; and a dose monitor that measures a dose of the particle beam, wherein the controller controls the scanning apparatus so that each irradiation position in the irradiation target are irradiated with the particle beam a rescan-count number of times by repeating for the rescan-count number of times the irradiation of all irradiation positions in a two-dimensional X-Y plane by repeating scan-shifting of the particle beam to a next irradiation position without interrupting the irradiation with the particle beam after a dose measured with the dose monitor reaches a dose calculated on the basis of the dose to be administered to a current irradiation position, stored in the memory, the particle beam irradiation apparatus comprising; a calculator that receives either one of a rescan count n or a beam intensity J that is a dose of the particle beam per unit time, to calculate a maximum value of the other satisfying the following conditional expression (P1) for all irradiation positions to present the maximum value to a user,
J*ti≦
di/n
(P1),where i is an irradiation position number;
ti is a time for the particle beam to be scan-shifted from an irradiation position i−
1 to an irradiation position i, calculated from the scan speed information and the position information stored in the memory; and
di is a dose to be administered to the irradiation position i, stored in the memory.- View Dependent Claims (2)
where a “
margin”
is a coefficient set on the basis of intensity fluctuations of the particle beam.
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3. A particle beam irradiation apparatus that includes:
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a scanning apparatus deflecting a particle beam in a two X-Y directions perpendicular to a traveling direction of the particle beam, to scan the particle beam two-dimensionally over irradiation positions in an irradiation target to be irradiate with the particle beam; a memory that stores position information on the irradiation positions, information on a dose to be administered to each irradiation position, and information on scan speed of the scanning apparatus; and a controller that controls the scanning apparatus, wherein the controller controls the scanning apparatus so that each irradiation position in the irradiation target are irradiated with the particle beam a rescan-count number of times by repeating for the rescan-count number of times the irradiation of all irradiation positions in a two-dimensional X-Y plane by repeating scan-shifting of the particle beam from a current irradiation position to a next irradiation position at a speed calculated on the basis of a dose to be administered to each irradiation position, stored in the memory, the particle beam irradiation apparatus comprising; a calculator that receives either one of a rescan count n or a beam intensity J that is a dose of the particle beam per unit time, to calculate a maximum value of the other satisfying the following conditional expression (P2) for all irradiation positions to present the maximum value to a user,
J*ti,min≦
di/n
(P2),where i is an irradiation position number;
ti,min is a minimum time for the particle beam to be able to be scan-shifted from an irradiation position i−
1 to an irradiation position i, calculated from the scan speed information and the position information stored in the memory; and
di, is a dose to be administered to the irradiation position i, stored in the memory.
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Specification