Intensity modulated three-dimensional radiation scanning method and apparatus
First Claim
1. An apparatus configured to control a charged particle beam for irradiation of a tumor of a patient, comprising:
- a synchrotron configured with an extraction foil, wherein a timing controller times the charged particle beam striking said extraction foil in an acceleration period in said synchrotron resulting in extraction of the charged particle beam at a selected energy;
a raster beam scanning system configured to scan the charged particle beam across delivery positions while both (1) delivering the charged particle beam at and between the delivery positions and (2) simultaneously varying said selected energy level of the charged particle beam across the delivery positions, wherein said control of said selected energy further comprises use of readings from a magnetic sensor, said magnetic sensor proximate a bending magnet in said synchrotron; and
a feedback system, wherein said feedback system stabilizes a magnetic field in said bending magnet using input from said magnetic sensor to control a correction coil operating at less than ten percent the power of a winding coil, both said correction coil and said winding coil wound around said bending magnet.
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Abstract
The invention relates to treatment of solid cancers and more particularly to a method and apparatus correlating proton beam intensity with proton delivery efficiency, optionally in a raster beam scanning system. The system induces betatron oscillation on the proton beam causing the beam to traverse an extraction material resulting in slowed protons and a feedback current proportional to the proton flux. A controller receives the desired intensity from an irradiation plan and the feedback current and adjusts the radio-frequency field in the radio-frequency cavity system to yield an intensity of the proton beam that matches the desired intensity from the irradiation plan. Preferably, the intensity of the proton beam correlates with radiation delivery efficiency. The system preferably operates in conjunction with a multi-field charged particle cancer therapy system, with charged particle beam injection, particle beam acceleration, multi-axis charged particle beam control, and/or targeting methods and apparatus.
405 Citations
17 Claims
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1. An apparatus configured to control a charged particle beam for irradiation of a tumor of a patient, comprising:
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a synchrotron configured with an extraction foil, wherein a timing controller times the charged particle beam striking said extraction foil in an acceleration period in said synchrotron resulting in extraction of the charged particle beam at a selected energy; a raster beam scanning system configured to scan the charged particle beam across delivery positions while both (1) delivering the charged particle beam at and between the delivery positions and (2) simultaneously varying said selected energy level of the charged particle beam across the delivery positions, wherein said control of said selected energy further comprises use of readings from a magnetic sensor, said magnetic sensor proximate a bending magnet in said synchrotron; and a feedback system, wherein said feedback system stabilizes a magnetic field in said bending magnet using input from said magnetic sensor to control a correction coil operating at less than ten percent the power of a winding coil, both said correction coil and said winding coil wound around said bending magnet. - View Dependent Claims (11)
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2. An apparatus configured to control a charged particle beam for irradiation of a tumor of a patient, comprising:
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a synchrotron configured with an extraction foil, wherein a timing controller times the charged particle beam striking said extraction foil in an acceleration period in said synchrotron resulting in extraction of the charged particle beam at a selected energy; a raster beam scanning system configured to scan the charged particle beam across delivery positions while both (1) delivering the charged particle beam at and between the delivery positions and (2) simultaneously varying said selected energy level of the charged particle beam across the delivery positions; and an intensity controller configured to measure a current resulting from the charged particle beam striking said extraction foil, said current used as a feedback control to a radio-frequency cavity system, wherein an applied radio frequency, using said feedback control, in said radio-frequency cavity system controls the number of particles in the charged particle beam striking said extraction foil resulting in intensity control of the charged particle beam. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
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12. A method for controlling a charged particle beam for irradiation of a tumor of a patient, comprising the steps of:
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a timing controller timing a synchrotron configured with an extraction foil, said timing controller timing the charged particle beam to strike said extraction foil in an acceleration period in said synchrotron resulting in extraction of the charged particle beam at a selected energy; a raster beam scanning system scanning the charged particle beam across delivery positions while both (1) delivering the charged particle beam at and between the delivery positions and (2) simultaneously varying said selected energy level of the charged particle beam across the delivery positions; an intensity controller measuring a current resulting from the charged particle beam striking said extraction foil, said current used as a feedback control to a radio-frequency cavity system; and controlling an applied radio frequency, using said feedback control, in said radio-frequency cavity system to control the number of particles in the charged particle beam striking said extraction foil resulting in intensity control of the charged particle beam. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification