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Dosimetric effect by shallow air cavities in high energy electron beams
Zarza-Moreno, M.; Carreira, P.; Madureira, L.; Miras del Rio, H.; Salguero, F. J.; Leal, A.; Teixeira, Nuno; Jesus, A. P.; Mora, G.This study evaluates the dosimetric impact caused by an air cavity located at 2 mm depth from the top surface in a PMMA phantom irradiated by electron beams produced by a Siemens Primus linear accelerator. A systematic evaluation of the effect related to the cavity area and thickness as well as to the electron beam energy was performed by using Monte Carlo simulations (EGSnrc code), Pencil Beam algorithm and Ga...
The use of non-standard CT conversion ramps for Monte Carlo verification of 6 M...
Zarza-Moreno, M.; Cardoso, I.; Teixeira, Nuno; Jesus, A. P.; Mora, G.Monte Carlo (MC) dose calculation algorithms have been widely used to verify the accuracy of intensity-modulated radiotherapy (IMRT) dose distributions computed by conventional algorithms due to the ability to precisely account for the effects of tissue inhomogeneities and multileaf collimator characteristics. Both algorithms present, however, a particular difference in terms of dose calculation and report. Whe...
Assesing multileaf collimator effect on the build-up region using Monte Carlo m...
Zarza-Moreno, M.; Teixeira, Nuno; Jesus, A. P.; Mora, G.Previous Monte Carlo studies have investigated the multileaf collimator (MLC) contribution to the build-up region for fields in which the MLC leaves were fully blocking the openings defined by the collimation jaws. In the present work, we investigate the same effect but for symmetric and asymmetric MLC defined field sizes (2×2, 4×4, 10×10 and 3×7 cm2). A Varian 2100C/D accelerator with 120-leaf MLC is accuratel...
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