Determination of the radiation dose scattered outside the target volume treated with IMRT technique |
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| Institution: | 1. Gerência de Metrologia das Radiações, Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN/SP), Av. Prof. Lineu Prestes, 2242, Cidade Universitária, CEP: 05508-000 São Paulo, SP, Brazil;2. Sociedade Beneficente Israelita Brasileira, Hospital Albert Einstein (HAE), Avenida Albert Einstein, 665, Morumbi, CEP: 05652-000 São Paulo, SP, Brazil;1. Department of Physical Sciences, Redeemer’s University, P.M.B. 3005, Redemption City, Nigeria;2. Department of Physics, Lancaster University, Lancaster LA1 4YB, United Kingdom;3. Laboratory of Modeling and Simulation in Engineering and Biological Physics, Faculty of Sciences, University of Yaoundé I, PO Box 812, Yaoundé, Cameroon;4. Department of Physics, University of Lagos, P.M.B 56 Akoka-Yaba, Lagos, Nigeria;1. Dunhuang Gobi Desert Research Station, Key Laboratory of Desert and Desertification/Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;2. Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwest China, Ningxia University, Yinchuan 750021, China;1. Instituto de Pesquisas Energéticas e Nucleares IPEN/CNEN, Av. Prof. Lineu Prestes, 2242, Cidade Universitária, 05508-000, São Paulo, SP, Brazil;2. Hospital Sírio-Libanês, Rua Prof. Daher Cutait, 69, Bela Vista, 01308-060, São Paulo, SP, Brazil |
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| Abstract: | Intensity Modulated Radiation Therapy (IMRT) is an advanced mode of high precision radiation therapy that uses computer controlled linear accelerators to deliver precise radiation doses to a malignant tumor or specific areas within the tumor. This is achieved using a more precise adjustment of the beam to the three dimensional shape of the tumor by modulating or controlling the intensity of the radiation beam in multiple small volumes. IMRT also allows higher radiation doses to be focused to regions within the tumor while minimizing the dose to surrounding normal critical structures. This work aims at determining the radiation dose in two target volumes (tumors) treated at same time and the scattered dose distribution in organs at risk using thermoluminescent dosimeters of LiF:Mg,Ti for IMRT treatment technique and a polymethylmethacrylate (PMMA) phantom. The shortest distance between the cavities 1 and 2 that simulate tumors is 1.5 cm and the shortest distances from the cavity 1 to the cavities 3, 4 and 5 are, respectively, 1.9 cm, 2.2 cm and 2.65 cm. The shortest distance from the cavity 2 to cavities 3, 4 and 5 are, respectively, 5.4 cm; 5.7 cm and 1.5 cm. The relative difference for the doses measured by TLD-100 and provided by the TPS were +3.7% and −1.38%. The out-of-target doses received by cavities 3, 4 and 5 corresponded on average to 19.36, 17.84% and 6.72% of the highest dose received by the cavity 1 and the doses received by cavities 3, 4 and 5 corresponded on average to 29.51%, 27.20% and 10.24% of the dose received by cavity 2. |
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| Keywords: | Thermoluminescent dosimetry LiF:Mg Ti IMRT quality assurance Out-of-target doses |
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