Monte Carlo study of in-field and out-of-field dose distributions from a linear accelerator operating with and without a flattening-filter

2012 ◽  
Vol 39 (8) ◽  
pp. 5194-5203 ◽  
Author(s):  
S. S. Almberg ◽  
J. Frengen ◽  
T. Lindmo
Keyword(s):  
Monte Carlo ◽  
Linear Accelerator ◽  
Monte Carlo Study ◽  
Dose Distributions ◽  
Flattening Filter

Monte Carlo study of electron dose distributions produced by the elekta precise linear accelerator

2006 ◽  
Vol 11 (6) ◽  
pp. 287-292 ◽  
Author(s):  
Hassan Ali Nedaie ◽  
M.A. Mosleh-Shirazi ◽  
M. Shariary ◽  
H. Gharaati ◽  
M. Allahverdi
Keyword(s):  
Monte Carlo ◽  
Linear Accelerator ◽  
Monte Carlo Study ◽  
Electron Dose ◽  
Dose Distributions

scholarly journals The Influence of Brass Compensator Thickness and Field Size on Neutron Contamination Spectrum in 18MV Elekta SL 75/25 Medical Linear Accelerator with and without Flattening Filter: A Monte Carlo Study

2018 ◽  
Vol 8 (3Sep) ◽  
Author(s):  
A S Talebi ◽  
M Maleki ◽  
P Hejazi ◽  
M Jadidi ◽  
R Ghorbani
Keyword(s):  
Monte Carlo ◽  
Linear Accelerator ◽  
Monte Carlo Study ◽  
High Energy ◽  
Nonparametric Tests ◽  
Primary Electron ◽  
Field Size ◽  
Dose Ratio ◽  
Medical Linear Accelerator ◽  
Flattening Filter

BackgroundOne of the most significant Intensity Modulated Radiation Therapy treatment benefits is a high target to normal tissue dose ratio. To improve this advantage, an additional accessory such as a compensator is used to delivering doses. Compensator-based IMRT treatment is usually operated with an energy higher than 10 MV. Photoneutrons, which have high linear energy transfer and radiobiological effectiveness, are produced by colliding high-energy photon beams with linear accelerator structures, then they deliver the unwanted doses to patients and staff. Therefore, the neutron energy spectra should be determined in order to calculate and reduce the photoneutron risk.Objective: We have conducted a comprehensive and precise study on the influence of brass compensator thickness and field size on neutron contamination spectrum in an Elekta SL 75/25 medical linear accelerator with and without the flattening filter by Monte Carlo method.Materials and Methods: MCNPX MC Code version 2.6.0 was utilized to simulate the detailed geometry of Elekta SL 75/25 head components based on Linac’s manual. This code includes an important feature to simulate the photo-neutron interactions. Photoneutrons spectrum was calculated after the Linac output benchmarking based on tuning the primary electron beam.Results and Conclusion: Based on the Friedman and Wilcoxon nonparametric tests results (P<0.05), photoneutron fluence directly depends on the field size and compensator thickness. Moreover, the unflattened beam provides lower photoneutron fluence than the flattened beam. Photoneutrons fluence is not negligible in compensator-based IMRT treatment. However, in order to optimize treatment plans, this additional and unwanted dose must be accounted for patients.

scholarly journals A Monte Carlo study of a flattening filter-free linear accelerator verified with measurements

2010 ◽  
Vol 55 (23) ◽  
pp. 7333-7344 ◽  
Author(s):  
Mårten Dalaryd ◽  
Gabriele Kragl ◽  
Crister Ceberg ◽  
Dietmar Georg ◽  
Brendan McClean ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Linear Accelerator ◽  
Monte Carlo Study ◽  
Flattening Filter Free ◽  
Flattening Filter

Dose evaluation of Grid Therapy using a 6 MV flattening filter-free (FFF) photon beam: A Monte Carlo study

2017 ◽  
Vol 44 (10) ◽  
pp. 5378-5383 ◽  
Author(s):  
Immaculada Martínez-Rovira ◽  
Josep Puxeu-Vaqué ◽  
Yolanda Prezado
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Study ◽  
Photon Beam ◽  
Dose Evaluation ◽  
Flattening Filter Free ◽  
Flattening Filter

scholarly journals Production and dosimetry of simultaneous therapeutic photons and electrons beam by linear accelerator: A Monte Carlo study

2015 ◽  
Author(s):  
Navid Khledi ◽  
Azim Arbabi ◽  
Dariush Sardari ◽  
Mohammad Mohammadi ◽  
Ahmad Ameri
Keyword(s):  
Monte Carlo ◽  
Linear Accelerator ◽  
Monte Carlo Study
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