نتایج جستجو برای: pagata gel dosimeter

تعداد نتایج: 106920  

Journal: :BioImpacts : BI 2013
Farideh Pak Alireza Farajollahi Ali Movafaghi Alireza Naseri

INTRODUCTION At present, the polymer gel dosimeter is considered to be the best possible dosimeter for measuring 3-dimesional radiation dose distribution in radiotherapy. These gels are normally toxic; therefore, manufacturing, handling and discarding them require special attention. In order to find less toxic recipe, N-isopropyle acrylamide polymer gel (NIPAM) was introduced. In this study, th...

2013
T Gorjiara C Baldock

Micelle gel is a radiochromic hydrogel with the potential to be used as a three dimensional (3D) radiation dosimeter. Since an ideal dosimeter should present water equivalent properties, in this study the water equivalence of two formulations of micelle gel has been investigated by calculating electron density, effective atomic number, fractional interaction probabilities, mass attenuation coef...

Journal: :Journal of Physics: Conference Series 2010

A. Takavar, E. Eqlimi, F. Pake, H.A. Nedaie, H.R. Saligheh Rad, M. Shojaee Moghadam, V. Vaezzadeh,

Background:  In this study a series of basic dosimetric properties of a low-density (LD) gel dosimeter are investigated. The dose response is studied regarding to linearity, sensitivity, dose-rate and energy dependence as well as lung tissue equivalence. Materials and Methods: The LD gel was made by mixing the polymer gel with expanded polystyrene spheres. Energy dependence was studied...

Journal: :journal of medical signals and sensors 0
seyed salman zakariaee asghar mesbahi ahmad keshtkar vahid azimirad

polymer gel dosimeter is the only accurate three dimensional (3d) dosimeter that can measure the absorbed dose distribution in a perfect 3d setting. gel dosimetry by using optical computed tomography (oct) has been promoted by several researches. in the current study, we designed and constructed a prototype oct system for gel dosimetry. first, the electrical system for optical scanning of the g...

Journal: :Applied Radiation and Isotopes 2015

2011
B. Azadbakht

Background: The purpose of this study was to determine the percentage depth dose (PDD) of PAGAT normoxic polymer gel dosimeter by electron beams using MRI technique for a standard clinically used Co-60 therapy unit and an electa linear accelerator. Materials and Methods: Using MRI, the formulation to give the maximum change in the transverse relaxation rate R2(1/T2) was determined to be 4.5% N,...

Journal: :Journal of Physics: Conference Series 2013

Journal: :Journal of Physics: Conference Series 2013

Ahmad Mostaar, Mohammad Houshyari Saeede Amiri

Introduction: In radiotherapy, treatment planning methods are evaluating and transforming every day, so precision in calculation and determination of dose delivery process is performing more important role in radiotherapy than past. In modern radiotherapy treatments, deramatically increase of small fields utilization, causes the polymeric gels has known as the most reliable dos...

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