Particle beam therapy system
First Claim
1. A particle beam therapy system that irradiates a charged particle beam, accelerated by an accelerator and scanned by a scanning electromagnet, onto an irradiation subject, the particle beam therapy system comprising:
- an irradiation management apparatus that controls the scanning electromagnet, based on target irradiation position coordinates of the charged particle beam; and
a position monitor that measures measurement position coordinates of the charged particle beam, wherein the irradiation management apparatus has a command value creator that outputs a control input to the scanning electromagnet, for scanning the charged particle beam, based on the target irradiation position coordinates and correction data, said correction data having been created in a preliminary irradiation,wherein (i) said preliminary irradiation is performed prior to said irradiation of said subject and (ii) an excitation pattern of the scanning electromagnet of said preliminary irradiation is the same as an excitation pattern of the scanning electromagnet of a main irradiation plan for actual irradiation of the subject, andwherein the correction data is created on a basis of the target irradiation position coordinates and the measurement position coordinates measured by the position monitor in said preliminary irradiation.
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Accused Products
Abstract
The objective of the present invention is to reduce the effect of the hysteresis of a scanning electromagnet so as to obtain a particle beam therapy system that realizes high-accuracy beam irradiation. There are included an irradiation management apparatus (32) that controls the scanning electromagnet (3), based on target irradiation position coordinates (Pi) of a charged particle beam (1b), and a position monitor (7) that measures measurement position coordinates (Ps) of the charged particle beam (1b). The irradiation management apparatus (32) has a command value creator (25) that outputs a control input (Io (Ir)) to the scanning electromagnet (3), based on the target irradiation position coordinates (Pi) and correction data (Ia) created on the basis of the measurement position coordinates (Ps), measured by the position monitor (7) in the preliminary irradiation in which the excitation pattern of the scanning electromagnet is the same as that of the main irradiation plan, and the target irradiation position coordinates (Pi).
54 Citations
9 Claims
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1. A particle beam therapy system that irradiates a charged particle beam, accelerated by an accelerator and scanned by a scanning electromagnet, onto an irradiation subject, the particle beam therapy system comprising:
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an irradiation management apparatus that controls the scanning electromagnet, based on target irradiation position coordinates of the charged particle beam; and a position monitor that measures measurement position coordinates of the charged particle beam, wherein the irradiation management apparatus has a command value creator that outputs a control input to the scanning electromagnet, for scanning the charged particle beam, based on the target irradiation position coordinates and correction data, said correction data having been created in a preliminary irradiation, wherein (i) said preliminary irradiation is performed prior to said irradiation of said subject and (ii) an excitation pattern of the scanning electromagnet of said preliminary irradiation is the same as an excitation pattern of the scanning electromagnet of a main irradiation plan for actual irradiation of the subject, and wherein the correction data is created on a basis of the target irradiation position coordinates and the measurement position coordinates measured by the position monitor in said preliminary irradiation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An irradiation method for irradiating a charged particle beam onto an irradiation subject, the method comprising:
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creating irradiation setting data, said setting data including at least target irradiation position coordinates and dosage amounts; outputting a control input to a scanning electromagnet performing a preliminary irradiation according to said setting data, wherein (i) said preliminary irradiation is performed prior to performing an actual irradiation on a subject and (ii) a scanning-electromagnet excitation pattern of the preliminary irradiation is the same as a scanning-electromagnet excitation pattern of actual irradiation; recording, in said preliminary irradiation, measurement data including at least measurement position coordinates; creating correction data based on the target irradiation position coordinates and the measurement position coordinates measured in said preliminary irradiation; and correcting the control input to the scanning electromagnet based on the correction data created in preliminary irradiation to create a corrected control input for actual irradiation on a subject.
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Specification