Particle beam irradiation apparatus and control method of the particle beam irradiation apparatus
First Claim
1. A particle beam irradiation apparatus that directs a particle beam to an affected area of a patient, the particle beam irradiation apparatus comprising:
- an emission control portion that controls emission and termination of the particle beam;
a control portion that sequentially changes an irradiation position of the particle beam for the affected area;
first and second dosimeters that measure dose rates of the particle beam directed to the affected area; and
an abnormality determination portion that uses dose measurement values obtained by accumulating the dose rates output from the first and second dosimeters to perform abnormality determination of the apparatus and that outputs, to the emission control portion, an interlock signal for terminating the emission of the particle beam when determining that there is an abnormality, whereinthe control portionaccumulates the dose rate output from the first dosimeter for each of irradiation positions of the particle beam to calculate a first beam dose measurement value and changes the irradiation position of the particle beam when the first beam dose measurement value reaches a first planned dose value predetermined for each of the irradiation positions, andthe abnormality determination portion performs;
first abnormality determination of accumulating the dose rate output from the second dosimeter for each of the irradiation positions of the particle beam to calculate a second beam dose measurement value and determining that there is the abnormality if the second beam dose measurement value exceeds a second planned dose value that is set to a value higher than the first planned dose value when the first beam dose measurement value reaches the first planned dose value; and
second abnormality determination of accumulating the dose rates output from the first and second dosimeters for each of predetermined determination periods to calculate sectional dose measurement values and determining that there is the abnormality based on the sectional dose measurement values.
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Accused Products
Abstract
Provided is a particle beam irradiation apparatus capable of highly reliable measurement of a dose of each beam and capable of highly sensitive measurement of a leakage dose caused by momentary beam emission. The particle beam irradiation apparatus according to the present invention includes: an emission control portion that controls emission and termination of a particle beam; a control portion that sequentially changes an irradiation position of the particle beam relative to an affected area; first and second dosimeters that measure dose rates of the particle beam directed to the affected area; and an abnormality determination portion that accumulates the dose rates output from the first and second dosimeters for each of predetermined determination periods to calculate first and second sectional dose measurement values and that performs second abnormality determination of determining that there is an abnormality and outputs an interlock signal for terminating the emission of the particle beam in at least one of a case in which the first sectional dose measurement value exceeds a predetermined first reference range and a case in which the second sectional dose measurement value exceeds a predetermined second reference range.
53 Citations
12 Claims
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1. A particle beam irradiation apparatus that directs a particle beam to an affected area of a patient, the particle beam irradiation apparatus comprising:
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an emission control portion that controls emission and termination of the particle beam; a control portion that sequentially changes an irradiation position of the particle beam for the affected area; first and second dosimeters that measure dose rates of the particle beam directed to the affected area; and an abnormality determination portion that uses dose measurement values obtained by accumulating the dose rates output from the first and second dosimeters to perform abnormality determination of the apparatus and that outputs, to the emission control portion, an interlock signal for terminating the emission of the particle beam when determining that there is an abnormality, wherein the control portion accumulates the dose rate output from the first dosimeter for each of irradiation positions of the particle beam to calculate a first beam dose measurement value and changes the irradiation position of the particle beam when the first beam dose measurement value reaches a first planned dose value predetermined for each of the irradiation positions, and the abnormality determination portion performs; first abnormality determination of accumulating the dose rate output from the second dosimeter for each of the irradiation positions of the particle beam to calculate a second beam dose measurement value and determining that there is the abnormality if the second beam dose measurement value exceeds a second planned dose value that is set to a value higher than the first planned dose value when the first beam dose measurement value reaches the first planned dose value; and second abnormality determination of accumulating the dose rates output from the first and second dosimeters for each of predetermined determination periods to calculate sectional dose measurement values and determining that there is the abnormality based on the sectional dose measurement values. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A control method of a particle beam irradiation apparatus that directs a particle beam to an affected area of a patient, the control method comprising the steps of:
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controlling emission and termination of the particle beam; sequentially changing an irradiation position of the particle beam for the affected area; measuring, by first and second dosimeters, dose rates of the particle beam directed to the affected area; performing abnormality determination of the apparatus using dose measurement values obtained by accumulating the dose rates output from the first and second dosimeters; and terminating the emission of the particle beam using an interlock signal when determining that there is an abnormality, wherein in the step of changing the irradiation position of the particle beam, the dose rate output from the first dosimeter is accumulated for each of irradiation positions of the particle beam to calculate a first beam dose measurement value, and the irradiation position of the particle beam is changed when the first beam dose measurement value reaches a first planned dose value predetermined for each of the irradiation positions, and the step of performing the abnormality determination includes; performing first abnormality determination of accumulating the dose rate output from the second dosimeter for each of the irradiation positions of the particle beam to calculate a second beam dose measurement value and determining that there is the abnormality if the second beam dose measurement value exceeds a second planned dose value that is set to a value higher than the first planned dose value when the first beam dose measurement value reaches the first planned dose value; and performing second abnormality determination of accumulating the dose rates output from the first and second dosimeters for each of predetermined determination periods to calculate sectional dose measurement values and determining that there is the abnormality based on the sectional dose measurement values. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification