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Delivery modification system for radiation therapy

  • US 6,385,286 B1
  • Filed: 06/28/2000
  • Issued: 05/07/2002
  • Est. Priority Date: 08/06/1998
  • Status: Expired due to Term
First Claim
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1. A method of operating a radiation therapy machine providing a radiation beam of individually energy and/or fluence modulated radiation rays directed along a radiation beam axis, the radiation beam axis positionable at a range of angles about a patient, the method comprising the steps of:

  • (a) accepting a ray treatment sinogram of rows and columns providing energy and/or fluence of different rays for a given angle of the radiation beam axis, in rows, and energy and/or fluence of a given ray for different angles of the beam axis, in columns, for a patient at a first position;

    (b) developing patient movement data indicating patient motion from the first position to a second position;

    (c) for each given beam axis angle of the ray treatment sinogram shifting the corresponding row of the treatment sinogram according to a component of the patient motion perpendicular to the given beam axis and scaling the corresponding row of the ray treatment sinogram according to a component of the patient motion parallel to the given beam axis;

    whereby divergence of the fan beam of treatment radiation may be accommodated.

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