Please use this identifier to cite or link to this item:
https://hdl.handle.net/10316/44632
Title: | Simulated annealing applied to IMRT beam angle optimization: A computational study | Authors: | Dias, Joana Rocha, Humberto Ferreira, Brígida Lopes, Maria do Carmo |
Keywords: | Algorithms; Head and Neck Neoplasms; Humans; Radiotherapy Planning, Computer-Assisted; Radiotherapy, Intensity-Modulated; Retrospective Studies | Issue Date: | 2015 | Serial title, monograph or event: | Physica Medica | Volume: | 31 | Issue: | 7 | Abstract: | Electing irradiation directions to use in IMRT treatments is one of the first decisions to make in treatment planning. Beam angle optimization (BAO) is a difficult problem to tackle from the mathematical optimization point of view. It is highly non-convex, and optimization approaches based on gradient descent methods will probably get trapped in one of the many local minima. Simulated Annealing (SA) is a local search probabilistic procedure that is known to be able to deal with multimodal problems. SA for BAO was retrospectively applied to ten clinical examples of treated cases of head-and neck tumors signalized as complex cases where proper target coverage and organ sparing proved difficult to achieve. The number of directions to use was considered fixed and equal to 5 or 7. It is shown that SA can lead to solutions that significantly improve organ sparing, even considering a reduced number of angles, without jeopardizing tumor coverage. | URI: | https://hdl.handle.net/10316/44632 | DOI: | 10.1016/j.ejmp.2015.03.005 | Rights: | openAccess |
Appears in Collections: | FEUC- Artigos em Revistas Internacionais |
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physica medica.pdf | 1.87 MB | Adobe PDF | View/Open |
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