Patent ID: 6504899
Filing Date: 2003-01-07
Classification: A61N,Y10S

Abstract:
A method for selecting an orientation of a treatment beam in intensity modulated radiation therapy, said method comprising:a) obtaining a model of a patient geometry comprising a planning target volume and at least one structure at risk; b) assigning a tolerance parameter to said at least one structure at risk; c) subdividing said treatment beam into beamlets; d) selecting a treatment parameter; e) selecting a set of angles for said treatment beam; f) deriving a score for each angle of said set of angles by weighting each of said beamlets to maximize said treatment parameter in said planning target volume while not exceeding said tolerance parameter in said at least one structure at risk; g) constructing a scoring function comprising said score as a function of angle; h) selecting at least one treatment angle based on said scoring function.