US 8,552,408 B2Granted

Particle beam irradiation apparatus and control method of the particle beam irradiation apparatus

AssigneesKabushiki Kaisha Toshiba, National Institute of Radiological Sciences

InventorsKatsushi Hanawa, Yasushi Iseki, Nobukazu Kakutani, Takuji Furukawa, Taku Inaniwa, Shinji Sato, Kouji Noda

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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.

Claims12

Dependent claims

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, 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.

8 more elements

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:

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.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/577,741Filed 7 Feb 2011
Priority: JP 2010-02804610 Feb 2010
Published: US 2012/0305790 A16 Dec 2012
Granted: 8 Oct 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

A61N 5/1043
With spatial modulation of the radiation beam within the treatment head: scanning the radiation beam, e.g. spot scanning or raster scanning
A61N 5/1071
Monitoring, verifying, controlling systems and methods: for verifying the dose delivered by the treatment plan
G21K 1/025
Using diaphragms, collimators: using multiple collimators, e.g. Bucky screens; other devices for eliminating undesired or dispersed radiation
A61N 2005/1074
Monitoring, verifying, controlling systems and methods: details of the control system, e.g. user interfaces