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Optimization of the wedge filter parameters for a radiotherapy treatment planning system
Author(s) -
Willemse C. A.,
Duvenage J.,
Lötter M. G.,
Minnaar P. C.,
Goedhals L.
Publication year - 1989
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.596344
Subject(s) - wedge (geometry) , radiation treatment planning , filter (signal processing) , beam (structure) , computer science , mathematics , optics , physics , radiation therapy , computer vision , medicine
When a treatment planning system uses an empirical or semianalytical approach to describe the influence of a wedge filter on a photon beam, a number of experimentally determined parameters are required. These may be found from direct measurement. However, if the beam model is sensitive to the parameters, it will be necessary to optimize the parameter values to obtain better correspondence between dose profiles calculated by the model and actual measured profiles. The procedure is time consuming if optimization is done manually. We have developed an optimization scheme, using a personal computer, to find the set of wedge parameters which will result in the best fit of calculated wedge profiles (using the beam model of the treatment planning system) to measured wedge profiles. The procedure is efficient and calculated profiles were found to match measured profiles to within 2% of the central axis value.