Monte Carlo Simulation of Surface Dose and Dose Rate in 6MV-FFF Beams

Assalmi, Mustapha; Diaf, El Yamani

doi:10.3103/s0027134922010027

Cited by 1 publication

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“…A major advantage of the 6FFF mode is the high dose rate compared to the 6FF mode, as a significant amount of photons (x-rays) are absorbed in the filtered case compared to the unfiltered case [39,40]. Furthermore, it is clear from the results presented in table 14 that the dose attenuation after 10 cm depth is faster for 6FFF compared to 6FF, which may minimize side effects outside the irradiated volume.…”

Section: MV Flattened Filter Free Beam Parametersmentioning

confidence: 99%

Effect of the Gaussian distribution parameters of the electron beam generated at the target on the simulated x-ray dose

Assalmi¹,

Diaf²

2023

Biomed. Phys. Eng. Express

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The purpose of this work was to investigate by Monte Carlo method the adjustment of photon beams delivered by the medical LINear ACcelerator (LINAC) Elekta Synergy MLCi2. This study presents an optimization of the Gaussian distribution parameters of the accelerated electrons before the target simulated by two Monte Carlo codes and for three beams. The photon (X-ray) beam is produced by the interaction of accelerated electrons with the LINAC target. The electrons are accelerated by a potential difference created between the anode and the cathode of the gun and directed towards the target. In the Monte Carlo simulation, it is necessary to setup the spectrum parameters of the generated electrons to simulate the X-ray dose distribution. In this study, we modeled the LINAC geometry for photon beams 18MV and 6MV in cases Flattened (FF) and Flattening-Filter-Free (FFF). The Monte Carlo simulations are based on G4Linac_MT and GATE codes. The results of the optimized configurations determined after more than 20 tests for each beam energy show a very good agreement with the experimental measurements for different irradiation fields for the depth (PDD) and lateral (Profile) dose distribution. In all Monte Carlo calculations performed in this study, the statistical uncertainty is less than 2%. The results were also in very good agreement in terms of γ-index analysis, for the 3%/3mm and 2%/2mm criteria.

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Section: MV Flattened Filter Free Beam Parametersmentioning

confidence: 99%