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Method and apparatus for calibration of radiation therapy equipment and verification of radiation treatment

  • US 6,345,114 B1
  • Filed: 10/15/1997
  • Issued: 02/05/2002
  • Est. Priority Date: 06/14/1995
  • Status: Expired due to Term
First Claim
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1. A method of calibrating a radiotherapy machine comprising the steps of:

  • (a) irradiating a volume of known composition and geometry with a beam of radiation having a beam intensity profile;

    (b) acquiring a measured portal image of the dose of the beam of radiation after it has passed through the volume along a number of rays;

    (c) employing an electronic computer receiving the measured portal image and the character and geometry of the volume and operating a stored program to;

    (i) model an expected portal image based on an irradiation of the volume with an assumed beam intensity profile;

    (ii) compare the expected portal image with the measured portal image to produce a correction image;

    (iii) incrementally modifying the assumed intensity profile based on the correction image;

    (iv) repeating steps (i)-(iii) with the assumed intensity profile being the modified assumed intensity profile;

    (d) outputting the modified assumed intensity profile as a measure of the intensity profile; and

    (e) calibrating the radiotherapy machine based on the modified assumed intensity profile.

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