Patent ID: 8280003
Filing Date: 2012-10-02
Classification: A61N

Abstract:
1. A method for calculating three dimensional head scatter fluence of a radiation treatment beam, the method comprising: generating a primary photon beam, the primary photon beam producing scattered radiation from a treatment head; modulating the primary photon beam with a plurality of jaws and a multi-leaf collimator (MLC) comprising a plurality of leaves through movement of the plurality of jaws and the plurality of leaves, the movement being expressed as a plurality of control points; organizing a plurality of jaw-opening positions corresponding to relative positions of the plurality of jaws and represented by the plurality of control points into a plurality of jaw-opening sets; deriving a three-dimensional (3D) head scatter fluence for each jaw-opening set in the plurality of jaw-opening sets; and combining 3D fluences of the plurality of jaw-opening sets to derive a 3D fluence of the scattered radiation from the treatment head.