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• W2000233920 endingPage "2004" @default.
• W2000233920 startingPage "1989" @default.
• W2000233920 abstract "Collimator systems used in Intensity Modulated Radiation Therapy can form different geometric aperture shapes depending on their physical capabilities. We compare the efficiency of using regular, rotating and dual multileaf collimator (MLC) systems under different combinations of consecutiveness, interdigitation and rectangular constraints. We also create a virtual freeform collimator, which can form any possible segment shape by opening or closing each bixel independently, to provide a basis for comparison. We formulate the problem of minimizing beam-on time as a large-scale linear programming problem. To deal with its dimensionality, we propose a column generation approach. We demonstrate the efficacy of our approach on a set of clinical problem instances. Our results indicate that the dual MLC under consecutiveness constraint yields very similar beam-on time to a virtual freeform collimator. Our approach also provides a ranking between other collimator technologies in terms of their delivery efficiencies." @default.
• W2000233920 created "2016-06-24" @default.
• W2000233920 creator A5047632649 @default.
• W2000233920 creator A5072868467 @default.
• W2000233920 date "2015-02-12" @default.
• W2000233920 modified "2023-09-25" @default.
• W2000233920 title "A column generation approach for evaluating delivery efficiencies of collimator technologies in IMRT treatment planning" @default.
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• W2000233920 doi "https://doi.org/10.1088/0031-9155/60/5/1989" @default.
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• W2000233920 hasPublicationYear "2015" @default.
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