Monte carlo simulation of siemens oncor linear accelerator with beamnrc and dosxyznrc code

Jabbari, Keyvan; Anvar, Hossein Saberi; Tavakoli, Mahdi; Amouheidari, Alireza

doi:10.4103/2228-7477.121010

Cited by 28 publications

(22 citation statements)

References 20 publications

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“…These methods have acceptable accuracy and reproducibility for dose prediction in complicated treatment plans. [123] The major weakness of the MC method is that it is inherently a time consuming method. However, with respect to the development of computer technology and variance reduction techniques, the MC method is becoming a practical approach in dose calculations for three-dimensional (3D) conventional radiotherapy and it has been recently applied in conformal radiation therapy techniques such as intensity modulated radiation therapy, microbeam radiation therapy and proton beam therapy.…”

Section: Introductionmentioning

confidence: 99%

A Comparison between GATE and MCNPX monte carlo codes in simulation of medical linear accelerator

et al. 2014

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Radiotherapy dose calculations can be evaluated by Monte Carlo (MC) simulations with acceptable accuracy for dose prediction in complicated treatment plans. In this work, Standard, Livermore and Penelope electromagnetic (EM) physics packages of GEANT4 application for tomographic emission (GATE) 6.1 were compared versus Monte Carlo N-Particle eXtended (MCNPX) 2.6 in simulation of 6 MV photon Linac. To do this, similar geometry was used for the two codes. The reference values of percentage depth dose (PDD) and beam profiles were obtained using a 6 MV Elekta Compact linear accelerator, Scanditronix water phantom and diode detectors. No significant deviations were found in PDD, dose profile, energy spectrum, radial mean energy and photon radial distribution, which were calculated by Standard and Livermore EM models and MCNPX, respectively. Nevertheless, the Penelope model showed an extreme difference. Statistical uncertainty in all the simulations was <1%, namely 0.51%, 0.27%, 0.27% and 0.29% for PDDs of 10 cm2× 10 cm2 filed size, for MCNPX, Standard, Livermore and Penelope models, respectively. Differences between spectra in various regions, in radial mean energy and in photon radial distribution were due to different cross section and stopping power data and not the same simulation of physics processes of MCNPX and three EM models. For example, in the Standard model, the photoelectron direction was sampled from the Gavrila-Sauter distribution, but the photoelectron moved in the same direction of the incident photons in the photoelectric process of Livermore and Penelope models. Using the same primary electron beam, the Standard and Livermore EM models of GATE and MCNPX showed similar output, but re-tuning of primary electron beam is needed for the Penelope model.

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Section: Introductionmentioning

confidence: 99%

A Comparison between GATE and MCNPX monte carlo codes in simulation of medical linear accelerator

et al. 2014

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“…In some studies, similar reasons were mentioned for the existence of small differences between calculated and measured curves. [ 31 32 ]…”

Section: Resultsmentioning

confidence: 99%

Photoneutron dose estimation in GRID therapy using an anthropomorphic phantom: A monte carlo study

et al. 2018

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Background:In the past, GRID therapy was used as a treatment modality for the treatment of bulky and deeply seated tumors with orthovoltage beams. Now and with the introduction of megavoltage beams to radiotherapy, some of the radiotherapy institutes use GRID therapy with megavoltage photons for the palliative treatment of bulky tumors. Since GRID can be a barrier for weakening the photoneutrons produced in the head of medical linear accelerators (LINAC), as well as a secondary source for producing photoneutrons, therefore, in terms of radiation protection, it is important to evaluate the GRID effect on photoneutron dose to the patients.Methods:In this study, using the Monte Carlo code MCNPX, a full model of a LINAC was simulated and verified. The neutron source strength of the LINAC (Q), the distributions of flux (φ), and ambient dose equivalent (H*[10]) of neutrons were calculated on the treatment table in both cases of with/without the GRID. Finally, absorbed dose and dose equivalent of neutrons in some of the tissues/organs of MIRD phantom were computed with/without the GRID.Results:Our results indicate that the GRID increases the production of the photoneutrons in the LINAC head only by 0.3%. The calculations in the MIRD phantom show that neutron dose in the organs/tissues covered by the GRID is on average by 48% lower than conventional radiotherapy. In addition, in the uncovered organs (by the GRID), this amount is reduced to 25%.Conclusion:Based on the findings of this study, in GRID therapy technique compared to conventional radiotherapy, the neutron dose in the tissues/organs of the body is dramatically reduced. Therefore, there will be no concern about the GRID effect on the increase of unwanted neutron dose, and consequently the risk of secondary cancer.

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“…The profile illustrates the discrepancy between the calculated results and the measured results. It can be caused by the uncertain setup of the ionisation chamber, leveling of the ionisation chamber, water tank, imprecise modelling of the linac head and random error that resulted during the simulation 8 . In some condition for better results, we used voxel with various sizes, for example in the build-up region voxels was so smaller than voxels in the tail region.…”

Section: Resultsmentioning

confidence: 99%

The comparison between 6 MV Primus LINAC simulation output using EGSnrc and commissioning data

2018

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IntroductionMonte Carlo calculation method is considered to be the most accurate method for dose calculation in radiotherapy. The purpose of this research is comparison between 6 MV Primus LINAC simulation output with commissioning data using EGSnrc and build a Monte Carlo geometry of 6 MV Primus LINAC as realistically as possible. The BEAMnrc and DOSXYZnrc (EGSnrc package) Monte Carlo model of the LINAC head was used as a benchmark.MethodsIn the first part, the BEAMnrc was used for the designing of the LINAC treatment head. In the second part, dose calculation and for the design of 3D dose file were produced by DOSXYZnrc. The simulated PDD and beam profile obtained were compared with that calculated using commissioning data. Good agreement was found between calculated PDD (1·1%) and beam profile using Monte Carlo simulation and commissioning data. After validation, TPR20,10, TMR and Spvalues were calculated in five different field.ResultsGood agreement was found between calculated values by using Monte Carlo simulation and commissioning data. Average differences for five field sizes in this approach is about 0·83% for Sp. for TPR20,10differences for field sizes 10×10 cm2is 0·29% and for TMR in five field sizes, the average value is ~1·6%.ConclusionIn conclusion, the BEAMnrc and DOSXYZnrc codes package have very good accuracy in calculating dose distribution for 6 MV photon beam and it can be considered as a promising method for patient dose calculations and also the Monte Carlo model of primus linear accelerator built in this study can be used as method to calculate the dose distribution for cancer patients.

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Monte carlo simulation of siemens oncor linear accelerator with beamnrc and dosxyznrc code

Cited by 28 publications

References 20 publications

A Comparison between GATE and MCNPX monte carlo codes in simulation of medical linear accelerator

A Comparison between GATE and MCNPX monte carlo codes in simulation of medical linear accelerator

Photoneutron dose estimation in GRID therapy using an anthropomorphic phantom: A monte carlo study

The comparison between 6 MV Primus LINAC simulation output using EGSnrc and commissioning data

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