| 摘要 |
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.
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