verification of dose rate and energy dependence of magica polymer gel dosimeter with electron beams

نویسندگان

k. adinehvand borujerd islamic azad university, borujerd, iran

m.h. zahmatkesh novin radiation medicine institute, tehran, iran

m.r aghamiri division of radiation medicine, shahid beheshti university, tehran, iran

sh. akhlaghpour department of radiology, tehran university of medical sciences, tehran, iran

چکیده

background: the purpose of this study was to evaluate the dependency of magica polymer gel dosimeter response (r2) on different electron energies as well as on different mean dose rate for a standard clinically used linear accelerator. materials and methods: the sensitivity of the dosimeter was represented by the slope of calibration curve in the linear region measured for each modality. a calibration curve (in the linear region) based on 12 dosimeters (11 irradiated and one blank) was obtained for 6 mev electron beam. dosimeter energy dependence was studied for electron energies of 4,6,12 and 18 mev. dose rate dependence was studied in 10 mev electron beam with the use of dose rates 80,160,240,320,400 and 480 cgymin-1. evaluations of dosimeters were performed on siemens symphony, germany, 1.5t scanner in the head coil. a multiecho sequence with 32 equidistant echoes was used for the evaluation of irradiated polymer gel dosimeters. the parameters of the sequence were as follows: tr 3000ms, te 20ms, slice thickness 4mm and fov 256mm. results: polymer gel dosimeter response r2 was increased with increasing electron energy. no trend in polymergel dosimeter r2 dependence was found on mean dose rate for electron beams. conclusion: in magica polymer gel, the sensitivity is dependant on electron energy increase, but no dependence was observed on response to dose rate. the presence of antioxidant and oxygen scavengers in the magica polymer gel is believed to cause different results. iran. j. radiat. res., 2008 6 (1): 31-36

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Verification of dose rate and energy dependence of MAGICA polymer gel dosimeter with electron beams

Background: The purpose of this study was to evaluate the dependency of MAGICA polymer gel dosimeter response (R2) on different electron energies as well as on different mean dose rate for a standard clinically used linear accelerator. Materials and Methods: The sensitivity of the dosimeter was represented by the slope of calibration curve in the linear region measured for each modalit...

متن کامل

Evaluation the Response of MAGICA Polymer Gel Dosimeter with Electron Beams

The purpose of this study was to evaluate dependence of MAGICA polymer gel dosimeter 1/T2 on different electron energies as well as on different mean dose rates for a standard clinically used Linear accelerator. A calibration curve (in the linear region) based on 12 dosimeters (11 irradiated and one background) was obtained for 6MeV electron beam. Dose rate of dependence was studied in 10MeV el...

متن کامل

Comparison of Energy Dependence of PAGAT Polymer Gel Dosimeter with Electron and Photon Beams using Magnetic Resonance Imaging

The purpose of this study was to evaluate dependence of PAGAT polymer gel dosimeter 1/T2 on different electron and photon energies for a standard clinically used Co therapy unit and an electa linear accelerator.Using MRI, the formulation to give the maximum change in the transverse relaxation rate R2(1/T2) was determined to be 4.5% N,N'-methylen-bis-acrylamide(bis), 4.5% acrylamid(AA), 5% gelat...

متن کامل

Effect of Gold Nanoparticle on Percentage Depth Dose Enhancement On Megavoltage Energy in MAGICA Polymer Gel Dosimeter

Background: Radiation-sensitive polymer gels are among the most promising three-dimensional dose verification tools and tissue-like phantom developed to date.Objective: The aim of this study is an investigating of percentage depth dose enhancement within the gel medium with used of conformal distribution gold nanoparticle as contrast agents by high atomic number material.Methods: In this work t...

متن کامل

Verification of the PAGAT polymer gel dosimeter by photon beams using magnetic resonance imaging

Background: In this work investigation of the normoxic PAGAT polymer gel dosimeter such as sensitivity, the R2-dose response with post time and the percentage depth dose (PDD) of PAGAT polymer gel dosimeter have been undertaken. Materials and Methods: Using MRI, the formulation to give the maximum change in the transverse relaxation rate R2 was determined to be 4.5% N,N'-methylenbis- ...

متن کامل

Effect of Gold Nanoparticle on Percentage Depth Dose Enhancement On Megavoltage Energy in MAGICA Polymer Gel Dosimeter

BACKGROUND Radiation-sensitive polymer gels are among the most promising three-dimensional dose verification tools and tissue-like phantom developed to date. OBJECTIVE The aim of this study is an investigating of percentage depth dose enhancement within the gel medium with used of conformal distribution gold nanoparticle as contrast agents by high atomic number material. METHODS In this wor...

متن کامل

منابع من

با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید


عنوان ژورنال:
iranian journal of radiation research

جلد ۶، شماره ۱، صفحات ۳۱-۳۶

میزبانی شده توسط پلتفرم ابری doprax.com

copyright © 2015-2023