Patent ID: 6385286
Filing Date: 2002-05-07
Classification: A61N

Abstract:
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.