نتایج جستجو برای: monte carlo calculation

تعداد نتایج: 170834  

2007
W Xiong D Huang L Lee J Feng K Morris E Calugaru C Burman J Li C-M Ma

Currently the Gamma Knife system is accompanied with a treatment planning system, Leksell GammaPlan (LGP) which is a standard, computer-based treatment planning system for Gamma Knife radiosurgery. In LGP, the dose calculation algorithm does not consider the scatter dose contributions and the inhomogeneity effect due to the skull and air cavities. To improve the dose calculation accuracy, Monte...

Journal: :journal of biomedical physics and engineering 0
m robatjazi tehran university of medical sciences k tanha bushehr university of medical sciences s r mahdavi iran university of medical sciences h r baghani shahid beheshti university h r mirzaei shahid beheshti university of medical sciences m mousavi tehran university of medical sciences

background: one of the main problems of dedicated iort accelerators is to determine dosimetric characteristics of the electron beams. monte carlo simulation of iort accelerator head and produced beam will be useful to improve the accuracy of beam dosimetry. materials and methods: liac accelerator head was modeled using the beamnrcmonte carlo simulation system. phase-space files were generated a...

  Abstract   Background : Beam-hardening artifacts in CT image set of patient with a hip prosthesis cause difference between dose distributions resulted by treatment planning system (TPS) algorithms and actual dose distribution in patient body. In this study, dose distributions of TPS algorithms were compared with the results of Monte Carlo simulations of Titanium and Steal as a h...

Journal: Money and Economy 2014

One of the most important methods employed to measure the market risk is value at risk calculation method. In this study, the value at risk of banks listed on the Tehran Stock Exchange and Over-the-counter (OTC) are calculated using parametric model, Monte Carlo simulation, historical simulation and Two-Sided Power (TSP) Distribution. The sample includes all listed banks in Iran. The results sh...

جعفر اسماعیلی, , سید ظفراله کلانتری, ,

 In this paper the cycle of muon catalyzed fusion processes has been simulated using Monte-Carlo methods. This simulation starts when muon enters the D/T mixture and follows the actual trajectories of the muonic atoms among the proceeding collisions, by using their cross sections. For this purpose a computer code has been written by Fortran language. The time dependence of the processes is take...

Ali Soleymani Meigooni Reza Faghihi, Sedigheh Sina

Introduction After the publication of Task Group number 43 dose calculation formalism by the American Association of Physicists in Medicine (AAPM), this method has been known as the most common dose calculation method in brachytherapy treatment planning. In this formalism, the water phantom is introduced as the reference dosimetry phantom, while the attenuation coefficient of the sources in the...

Journal: :iranian journal of radiation research 0
k.n. esnaashari department of medical physics tehran university of medical sciences, tehran, iran m. allahverdi department of medical physics tehran university of medical sciences, tehran, iran h. gharaati department of medical physics tehran university of medical sciences, tehran, iran m. shahriari department of medical radiation, shahid beheshti university, tehran, iran

background: stereotactic radiosurgery is an important clinical tool for the treatment of small lesions in the brain, including benign conditions, malignant and localized metastatic tumors. a dosimetry study was performed for elekta ‘synergy s ’ as a dedicated stereotactic radiosurgery unit, capable of generating circular radiation fields with diameters of 1-5 cm at isocentre using the beam/egs4...

2008
Michiel C.J. Bliemer John M. Rose Stephane Hess

This paper compares different types of simulated draws over a range of number of draws in generating Bayesian efficient designs for stated choice (SC) studies. The paper examines how closely pseudo Monte Carlo, quasi Monte Carlo and Gaussian quadrature methods are able to replicate the true levels of Bayesian efficiency for SC designs of various dimensions. The authors conclude that the predomi...

2013
Nitesh Kumar R. N. Sengupta

This paper will try to look into the two important methods for the calculation of Value at Risk (VaR) for non linear portfolio using Monte Carlo Simulation method. The two techniques Closed form VaR and Multilevel Monte Carlo VaR for valuing the derivative portfolio are explained in details. In case of multilevel Monte Carlo simulation, it has been found that with decrease in the number of inne...

Journal: :iranian journal of medical physics 0
reza faghihi school of mechanical engineering, nuclear engineering department, shiraz university, shiraz, iran radiation research center, shiraz university, shiraz, iran

introduction after the publication of task group number 43 dose calculation formalism by the american association of physicists in medicine (aapm), this method has been known as the most common dose calculation method in brachytherapy treatment planning. in this formalism, the water phantom is introduced as the reference dosimetry phantom, while the attenuation coefficient of the sources in the...

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