نتایج جستجو برای: Polymer gel treatment

تعداد نتایج: 1570732  

Journal: :iranian journal of medical physics 0
azizollah rahimi msc student of medical physics, tarbiat modares university, tehran, iran. bijan hashemi associate professor, medical physics dept., tarbiat modares university, tehran, iran. mohammad hassan zahmatkesh assistant professor, novin medical radiation institute, tehran, iran. ramin jaberi physicist, cancer institute, department of radiotherapy and oncology, imam khomeini hospital, tehran, iran. shahab sheibani assistant professor, nuclear sciences research center, nuclear science and technology research center, tehran, iran.

introduction: polymer gels are modern dosimeters providing three dimensional dose distributions. these dosimeters can be used in brachytherapy in which the tumor dimension is relatively small and the dose gradient is high. in this study, the ability of the magica polymer gel was investigated for assessing the absolute dose values as well as the dose distribution of low dose rate (ldr) ir-192 wi...

Excessive water production through fractures become an important problem in oil exploration of fractured reservoirs. For this purpose, polymer gels were prepared by crosslinking of aqueous solutions of polymer and crosslinker for the purpose of water management in high water cut fractured reservoirs. A copolymer of sulfonated polyacrylamide was used as polymer and chromium triacetate (Cr(OA...

Azizollah Rahimi Bijan Hashemi, Mohammad Hassan Zahmatkesh Ramin Jaberi Shahab Sheibani

Introduction: Polymer gels are modern dosimeters providing three dimensional dose distributions. These dosimeters can be used in brachytherapy in which the tumor dimension is relatively small and the dose gradient is high. In this study, the ability of the MAGICA polymer gel was investigated for assessing the absolute dose values as well as the dose distribution of low dose rate (LDR) Ir-192 wi...

F Mousavi H R Khalkhali R Zohdiaghdam Zh Behrouzkia

Background: Gold nanoparticles (GNPs) are among the most promising radiosensitive materials in radiotherapy. Studying the effective sensitizing factors such as nanoparticle size, concentration, surface features, radiation energy and cell type can help to optimize the effect and possible clinical application of GNPs in radiation therapy. In this study, the radiation sensitive polymer gel was use...

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...

Seyed Mohammad Mahdi Abtahi Vahid Anaraki

Introduction: Three physical conditions caused an external beam designated as a small field. The first is the loss of lateral charged particle equilibrium. The second is the effect of collimators on the primary photon source occlusion. The third condition is the size of the detector which is large compared to the field size. The most obvious perturbation effects in last condit...

Journal: :iranian journal of medical physics 0
hossein hasani m.sc. student in medical radiation engineering, science and research branch, islamic azad university, tehran, iran hasan nedaie assistant professor, radiotherapy and oncology dept., tehran university of medical sciences, cancer research center, center institute, tehran, iran mohammad hasan zahmatkesh associate professor, medical physics dept., novin medical radiation institute, tehran, iran mahmood allahverdi associate professor, medical physics dept., tehran university of medical sciences, tehran, iran saeid bagheri m.sc. of medical physics, novin medical radiation institute, shahid beheshti university, tehran, iran sajad mirzaie m.sc. student in medical radiation engineering, science and research branch, islamic azad university, tehran, iran

introduction: in radiotherapy, methods of treatment planning are becoming increasingly more complicated. this requires verification of the doses delivered to increasingly smaller and more precise regions. radiotherapy techniques are continuously employing smaller and smaller field sizes to deliver tighter radiation doses with higher therapeutic ratios, generating interest among researchers to p...

Hasan Nedaie Hossein Hasani, Mahmood Allahverdi Mohammad Hasan Zahmatkesh Saeid Bagheri Sajad Mirzaie

Introduction: In radiotherapy, methods of treatment planning are becoming increasingly more complicated. This requires verification of the doses delivered to increasingly smaller and more precise regions. Radiotherapy techniques are continuously employing smaller and smaller field sizes to deliver tighter radiation doses with higher therapeutic ratios, generating interest among researchers to p...

R. Jafari Khalilabadi, S. Aftabi, S.M. Abtahi,

Background: There are various methods to read out responses of a polymer-gel dosimeter, among which the Magnetic Resonance Imaging (MRI) technique is the most common one. Optimizing imaging protocols can have significant effect on the sensitivity and the dose resolution of polymer gel dosimeters. This study has investigated the effects of the number of echoes (NOE) and the echo time spacing (ES...

بنایی, نوشین , زیرک, علیرضا, سجادی, سوده سادات , شیرازی, علیرضا , ندایی, حسنعلی ,

Modern radiotherapy techniques try to deliver the radiation dose by steep gradient. Protocols for these complex treatment delivery techniques are important and extremely sensitive to errors in treatment delivery. To minimize such errors, 3D dosimeters were developed as a relative method for improving dose monitoring and delivery. The aim of this study is to analyze the capability and drawbacks ...

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