Patent ID: 7529339
Filing Date: 2009-05-05
Classification: A61N,G16H

Abstract:
1. A method of optimizing planned dose delivery of radiation comprising the steps of: determining an objective function to be used for mapping radiation beams to a body volume comprising at least one target volume, and at least one non-target volume, the objective function comprising a first term related to the at least one target volume and a second term related to the at least one non-target volume; determining an optimal set of weights of beamlets using the objective function whereby beams, comprising a plurality of beamlets, mapped to pass through the at least one non-target volume, comprising a plurality of non-target volume portions, are limited such that the second term is zero only when a product of the weight of a beamlet mapped to pass through a non-target volume portion and the dose deposited by said beamlet is equal to a first predetermined average dose constraint value for the respective non-target volume portion, for all beamlets mapped to pass through the at least one non-target volume; and delivering radiation based on the determined optimal set of weights of beamlets.