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System for the delivery of proton therapy by pencil beam scanning of a predeterminable volume within a patient

  • US 9,108,050 B2
  • Filed: 03/28/2013
  • Issued: 08/18/2015
  • Est. Priority Date: 04/03/2012
  • Status: Active Grant
First Claim
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1. A system for delivery of proton therapy by pencil beam scanning of a predeterminable volume within a patient, the system comprising:

  • a proton source for generating a proton beam being adjustable with respect to beam intensity, beam energy or the beam intensity and the beam energy;

    a number of proton beam bending and/or focusing units;

    a beam nozzle having an outlet for the proton beam to penetrate the predeterminable volume of the patient;

    a beam bending magnet disposed upstream of said beam nozzle;

    a plurality of sweeper magnets for sweeping the proton beam in both lateral directions;

    a first position-sensitive detector aligned with said beam nozzle for controlling a position of the proton beam;

    a second position-sensitive detector integrated into a patient table;

    control logic for controlling the position and energy of the proton beam and having a beam steering data set; and

    correction logic aligned with said control logic for correcting beam position errors by comparing an expected beam position with an actual beam position detected in said first position-sensitive detector and generating beam position correction data in dependency on comparison results, the beam position correction data is introduced into the beam steering data set after running a patient-field specific steering file to identify scan specific corrections, and wherein said correction logic further uses a generic dynamic correction model for correcting the beam position errors which decay as a function of time after a change of proton energy.

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