نتایج جستجو برای: pagata gel dosimeter

تعداد نتایج: 106920  

Journal: :iranian journal of radiation research 0
t. allahverdi pourfallah department of medical physics and biomedical engineering, tehran university of medical sciences, tehran, iran m. allahverdi department of medical physics and biomedical engineering, tehran university of medical sciences, tehran, iran n. riyahi alam department of medical physics and biomedical engineering, tehran university of medical sciences, tehran, iran m.r. ay research center for science and technology in medicine, tehran university of medical sciences, tehran, iran m.h. zahmatkesh novin medical radiation institute, tehran, iran

background: polymer gel dosimetry is still the only dosimetry method for direct measuring of threedimensional dose distributions. mri polymer gel dosimeters are tissue equivalent and can act as a phantom material. in this study the obtained isodose maps with pagat polymer gel dosimeter were compared to those calculated with egsnrs for singleshot irradiations of 8 and 18 mm collimators of gamma ...

Journal: :journal of biomedical physics and engineering 0
m. mahdavi ph.d, physics depart- ment, mazandaran uni- versity, babolsar, iran m. khadem-abolfazli m.sc, para medical de- partment, babol univer- sity of medical sciences, babol, iran s. r. m. mahdavi ph.d, medical physics department, tehran university of medical sci- ences, tehran, iran gh. ataei m.sc, para medical de- partment, babol univer- sity of medical sciences, babol, iran

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...

Ghorban Safaeian, Mina Nouri, Mohammad Hosein Bahreyni Toossi Mohammad Taghi Bahreyni Toossi Shahram Bayani

Introduction: The objective of this work is to study the ability of MRI normoxic polymer gel dosimetry system to be used to verify the calculated dose distribution, in a simple geometry, in clinical radiotherapy. Materials and Methods:  Initially, 2 liters of the normoxic MAGAT polymer gel was prepared and then poured into two cylindrical Perspex phantom (simu...

2008
Ridthee Meesat Jean-Paul Jay-Gerin Abdelouahed Khalil Martin Lepage

In this study, our aim is to assess the potential of Fricke and polyacrylamide gel (PAG) dosimeters to quantitatively evaluate the efficiency of potential radiation sensitizers/protectors and antioxidants. These compounds are of importance in radiotherapy as well as in disease prevention and promotion of health. The basic principle of the Fricke dosimeter is the radiation-induced oxidation of F...

2011
K. Adinehvand B. Azadbakht

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...

A R Montazerabadi A Takavar M H Zahmatkesh M Keshtkar,

Background: Polymer gel dosimeters combined with magnetic resonance imaging (MRI) can be used for dose verification of advanced radiation therapy techniques. However, the uncertainty of dose map measured by gel dosimeter should be known. The purpose of this study is to investigate the uncertainty related to calibration curve and MRI protocol for MAGIC (Methacrylic and Ascorbic acid in Gelatin I...

2006
G. Gambarini D. Brusa M. Carrara G. Castellano M. Mariani M. Valente E. Vanossi

Abstract. Gel dosimeters are integrating dosimeters, that enable dose verification in three dimensions. Optical analysis of gel dosimeters has demonstrated to be an available technique for imaging the absorbed in-phantom dose exposed to radiotherapy beams. The goal is to demonstrate the ability of gel dosimeters to achieve accurately and spatial resolution in dose mapping, also when high dose r...

2004
L J Schreiner

The innovation of adding a gel matrix to the traditional Fricke dosimeter to stabilize geometric information established the field of gel dosimetry for radiation therapy. A discussion of Fricke gels provides an overview of the issues that determine the dose response of all gel dosimeters in general. In this paper we review some of the features of Fricke systems to illustrate these issues and, i...

Journal: :iranian journal of medical physics 0
tayeb allahverdi pourfallah biochemistry and biophysics dept., faculty of medicine, mazandaran university of medical sciences, sari, iran

introduction polymer gel dosimeters offer a practical solution to 3d dose verification for conventional radiotherapy as well as intensity-modulated and stereotactic radiotherapy. in this study, egsnrc calculated and pagat polymer gel dosimeter measured dose profiles from single shot irradiation with 18 mm collimator of gamma knife in homogeneous and inhomogeneous phantoms were compared with eac...

Journal: :Journal of Physics: Conference Series 2010

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