نتایج جستجو برای: fan beam collimator

تعداد نتایج: 126659  

Journal: :iranian journal of medical physics 0
m. t. bahreyni toosi professor, medical physics research center, bu-ali research institute, mashhad university of medical sciences, mashhad, iran. m. momen nezhad ph.d. student in medical physics, mashhad university of medical sciences, mashhad, iran h. saberi ph.d. student in medical physics, mashhad university of medical sciences, mashhad, iran m. h. bahreyni toosi professor, medical physics research center, bu-ali research institute, mashhad university of medical sciences, mashhad, iran. a. hashemian assistant professor, medical physics research center, bu-ali research institute, mashhad university of medical sciences, mashhad, iran. r. salek assistant professor, radiation oncology dept., imam reza hospital, mashhad university of medical sciences, mashhad, iran.

ntroduction:  monte  carlo  simulation  is  the  most  accurate  method  of  simulating  radiation  transport  and  predicting doses at different points of interest in radiotherapy. a great advantage of the monte carlo method  compared  to  the  deterministic  methods  is  the  ability  to  deal  accurately  with  any  complex  geometry.  its  disadvantage is the extremely long computing time r...

Journal: :Journal of Infrared, Millimeter, and Terahertz Waves 2017

Fatemeh Sadat Rasouli Seyed Farhad Masoudi,

Introduction BNCT is an effective method to destroy brain tumoral cells while sparing the healthy tissues. The recommended flux for epithermal neutrons is 109 n/cm2s, which has the most effectiveness on deep-seated tumors. In this paper, it is indicated that using D-T neutron source and optimizing of Beam Shaping Assembly (BSA) leads to treating brain tumors in a reasonable time where all IAEA ...

Journal: :Review of Scientific Instruments 2021

This article provides information about the sizing and standardization of a Faraday cup (FC) used as plasma diagnostic. instrument is to accurately map ion beam profile produced by an electric propulsion (EP) device. A FC cylindrical probe that uses electrode, termed collector, measure current. Several studies have shown relevance adding extra called collimator, define collection area minimize ...

Jamal Amiri

Introduction: The Monte Carlo simulation is used to enhance reliability in the experiments related to nuclear instruments. in addition, that is used to calculate the different components of the neutron and gamma ray fluxes in boron neutron capture therapy(BNCT) and neutron capture (NCT)applications. BNCT is one of the methods in radiotherapy, that is used the neutron beam for ki...

2014
S. Senthilkumar

The accuracy of external beam radiotherapy has improved rapidly in recent years with the advancement of technology. New modalities like three‐dimensional (3D) conformal radiotherapy, IMRT (intensity modulated radiotherapy) based on multi‐leaf collimator (MLC) and Tomotherapy technology for cancer treatments have been adopted in radiotherapy centers. In many developing countries like India these...

2008
Cristina Crespo Judith Gallego Albert Cot Carles Falcón Pablo Aguiar Josep Sempau Francisco Lomeña Francisco Calviño Javier Pavía Domènec Ros

Purpose I-labelled radioligands are commonly used for single-photon emission computed tomography (SPECT) imaging of the dopaminergic system to study the dopamine transporter binding. The aim of this work was to compare the quantitative capabilities of two different SPECT systems through Monte Carlo (MC) simulation. Methods The SimSET MC code was employed to generate simulated projections of a n...

2001
R. P. Fliller A. Drees D. Gassner L. Hammons D. Trbojevic V. Biryukov Y. Chesnokov V. Terekhov

The use of a two stage crystal collimation system in the RHIC yellow ring is examined. The system includes a copper beam scraper and a bent silicon crystal. While scrapers were installed in both of the RHIC rings before the year 2000 run, the crystal is installed for the 2001 run in one ring only, forming a two stage collimation system there. We present simulations of the expected channeling th...

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