نتایج جستجو برای: gamma knife monte carlo code sdd
تعداد نتایج: 360235 فیلتر نتایج به سال:
introduction: secondary radiation such as photoelectrons, auger electrons and characteristic radiations cause a local boost in dose for a tumor when irradiated with an external x-ray beam after being loaded with elements capable of activating the tumor, e.g.; i and gd. materials and methods: in this investigation, the mcnpx code was used for simulation and calculation of dose enhancement facto...
To examine the domain decomposition of a coupled Monte Carlo nite element calculation, it is important to use a domain decomposition that is suitable for the individual models. We have developed a code that simulates a Monte Carlo calculation running on a massively parallel processor. This code is used to examine the load balancing behavior of three domain decomposition strategies for a Monte C...
In this study, we fabricated a Cerenkov fiber-optic dosimeter (CFOD) without any scintillator to measure Cerenkov radiation signals owing to gamma-rays. The relative depth dose (RDD) distributions of Ir-192 HDR brachytherapy source were obtained by using the CFOD based on a subtraction method and the RDD curve was compared with the simulation result of Monte Carlo N-particle extended transport ...
Our institution delivers TBI using a modified Theratron 780 60Co unit. Due to limitations of our treatment planning system in calculating dose for this treatment, we have developed a fast Monte Carlo code to calculate dose distributions within the patient. The algorithm is written in C and uses voxel density information from CT images to calculate dose in heterogeneous media. To test the algori...
We present the results in embedding a multigrid solver for Poisson's equation into the parallel 3D Monte Carlo device simulator, PMC-3D. First we have implemented the sequential multigrid solver, and embedded it into the Monte Carlo code which previously was using the sequential successive overrelaxation (SOR) solver. Depending on the convergence threshold, we have obtained signi cant speedups ...
The present study deals with a new method for measuring the power of a reactor. This method uses gamma and neutron radiation resulted from the entire reactor structure, without changing its structure (online). In terms of functionality, this method can measure the reactor power in real-time and report it instantly. In order to obtain the relationship between reactor power and gamma and neutron ...
Rabbit internal dosimetry for iodine-131 using GATE Monte Carlo simulation code: a preclinical trial
Introduction: One of the main concerns in administration of radiotracers, especially in therapeutic arm, is the amount of delivered dose to the different organs. Individual variations of anatomy, physiology and underlying pathology in the patients lead to alteration of administered activity. In the current study we preclinically applied internal dosimetry using an animal mod...
Abstract Background: This study was done to define the role of Graded Prognostic Assessment (GPA) score for predicting overall survival in patients diagnosed with brain metastases undergoing Gamma-knife radiosurgery. Materials and methods: Patients diagnosed with brain metastases who were candidates for Gamma-knife radiosurgery entered this cross sectional study between 2003 and 2011. Clin...
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