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Charged particle cancer therapy system magnet control method and apparatus

  • US 8,373,145 B2
  • Filed: 08/17/2009
  • Issued: 02/12/2013
  • Est. Priority Date: 05/22/2008
  • Status: Active Grant
First Claim
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1. A particle beam irradiation apparatus for cancer therapy of a tumor of a patient, said apparatus controlling an operational magnetic field, wherein the operational magnetic field controls direction of charged particles, said apparatus comprising:

  • a synchrotron comprising turning magnets, a magnetic field sensor, a gap through which the charged particles pass during use, and at least one correction coil, said magnetic field sensor placed proximate said gap in said synchrotron,wherein, said turning magnets comprise;

    windings operating at a first power level to generate a first magnetic field about said gap; and

    said at least one correction coil operating at a second power level, said second power level less than about five percent of said first power level, to generate a correction magnetic field about said gap during use,wherein the first magnetic field and the correction magnetic field combine to yield the operational magnetic field during use,wherein said synchrotron adjusts to a target magnetic field strength via monitoring the operational magnetic field to determine said second power level, wherein as a result of lower power consumption said second power level allows for more accurate and/or precise control of the operational magnetic field.

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