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• W1977887023 abstract "This study presents beam characteristics of five recently available x-ray beams produced by an on-board imager (OBI 1.4) for acquiring kilovoltage cone-beam computed tomography (kV-CBCT) and investigates suitable methods for the beam radiation output determination resulting from an image acquisition. Both are essential for commissioning an x-ray beam in a radiotherapy treatment planning system. The BEAM/DOSXYZnrc Monte Carlo codes were used in the investigation. The simulated beam data were benchmarked against measurements. Three different commercially available plastic phantom materials are investigated as liquid water substitutes in the beam radiation output determination. Ionization chambers are used for the measurements. Five kV-CBCT beam characteristics including photon fluence, average beam energy and photon spectra are generated from Monte Carlo simulations. The Monte Carlo calculated dose profiles are validated by measurements. The fluence of kV-CBCT beams is strongly dependent on the geometry of added filters as well as X and Y beam collimations. The potential errors of determining the beam output of a kV-CBCT beam in Solid Water and PMMA phantoms may approach 8% and 20%, respectively, for use in a conventional treatment planning system, whereas using the Plastic Water low-energy range (PW-LR) phantom results in errors within 2%. The Monte Carlo simulation is essential in providing the parameters of an x-ray beam which are needed for the commissioning of a kV-CBCT beam in a radiotherapy treatment planning system. The PW-LR phantom is a suitable liquid water substitute in the beam output determination resulting from a kV-CBCT acquisition." @default.
• W1977887023 created "2016-06-24" @default.
• W1977887023 creator A5040051510 @default.
• W1977887023 creator A5048647206 @default.
• W1977887023 date "2010-08-16" @default.
• W1977887023 modified "2023-10-08" @default.
• W1977887023 title "Beam characteristics and radiation output of a kilovoltage cone-beam CT" @default.
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• W1977887023 doi "https://doi.org/10.1088/0031-9155/55/17/022" @default.
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