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Charged particle cancer therapy and patient breath monitoring method and apparatus

  • US 8,309,941 B2
  • Filed: 09/17/2009
  • Issued: 11/13/2012
  • Est. Priority Date: 05/22/2008
  • Status: Active Grant
First Claim
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1. An apparatus for controlling extraction of charged particles from a synchrotron for irradiation therapy of a tumor of a patient, comprising:

  • a synchrotron configured to accelerate the charged particles, said synchrotron comprising;

    a radio-frequency cavity system comprising a first pair of blades for inducing oscillation of the charged particles; and

    a foil configured to yield slowed charged particles from the charged particles having sufficient oscillation to traverse said foil, wherein the slowed charged particles pass through a second pair of blades having an extraction voltage directing the charged particles out of said synchrotron through a Lamberson extraction magnet, said radio-frequency cavity system for inducing oscillation configured and timed using said respiration signal;

    a respiration sensor generating a respiration signal, said respiration signal corresponding to a variable rate breathing pattern of the patient, said respiration sensor comprising at least one of;

    a force meter strapped to the patient'"'"'s chest;

    a first thermal resistor configured in a first position proximate an exhalation path of the patient; and

    a second thermal resistor configured in a second position both out of the exhalation path of the patient and in a local room environment common with the patient, wherein said respiration signal is generated using differences between readings from said first thermal resistor and said second thermal resistor,wherein said radio-frequency cavity system for inducing oscillation is timed using said respiration signal to time extraction of the charged particles to the tumor based on said variable rate breathing pattern.

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