نتایج جستجو برای: Gold nanoparticles Dosimetry Phantom

تعداد نتایج: 201591  

Journal: :iranian journal of radiation research 0
m. khadem-abolfazli physics department, mazandaran university, babolsar, iran m. mahdavi physics department, mazandaran university, babolsar, iran s.r.m. mahdavi medical physics department, iran university of medical sciences, tehran, iran gh. ataei para medical school, babol university of medical sciences, babol, iran

background: radiation-sensitive polymer gels are among the most promising three-dimensional dose verification tools and tissue-like developed to date. among the special features of this type of dosimeters, is be doped with other elements or chemicals which made them appropriate for investigating of dose enhancement with contrast agents, by high atomic number. material and methods: in this study...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تبریز - دانشکده شیمی 1392

in the present work, a simple and sensitive method was developed for determination of morphine and heroin using gold nanoparticles as resonance rayleigh scattering (rrs) and colorimetric technique’s probe. synthesized gold nanoparticles by sodium citrate reduction method have a negative charge layer on their surfaces because of self-assembled citrate anions on their surface. binding of morphin...

Journal: :Medical physics 2009
Harshad Sakhalkar David Sterling John Adamovics Geoffrey Ibbott Mark Oldham

This study presents the application of the Presage/optical-CT 3D dosimetry system for relative dosimetry in the Radiologic Physics Center (RPC) Head and Neck (H&N) IMRT phantom. Performance of the system was evaluated by comparison with the "gold-standard" RPC credentialing test. A modified Presage cylindrical insert was created that extended the capability of the RPC H&N phantom to 3D dosimetr...

2015
Somayeh Asadi Mehdi Vaez‐zadeh S. Farhad Masoudi Faezeh Rahmani Courtney Knaup Ali S. Meigooni

The effects of gold nanoparticles (GNPs) in 125I brachytherapy dose enhancement on choroidal melanoma are examined using the Monte Carlo simulation technique. Usually, Monte Carlo ophthalmic brachytherapy dosimetry is performed in a water phantom. However, here, the compositions of human eye have been considered instead of water. Both human eye and water phantoms have been simulated with MCNP5 ...

ژورنال: سنجش و ایمنی پرتو 2019

Radiotherapy includes all methods that can deliver a particular amount of ionizing radiation to malignant tissues, assuming that minimal damage hurts healthy tissues. We are looking for a valuable and reliable method to measure absorbed dose and the ability to measure the distribution of absorbed dose in three dimensions which nowadays is one of the three-dimensional dosimetry methods in using ...

Background: Normoxic type MAGICA gel dosimeters are established for dose quantification in three dimensions for radiotherapy. Objective(s): The ability of MAGICA polymer gel was assessed by experimental measurements method for studying the effect of gold nanoparticles (GNPs) in dose enhancement under the external 18MV radiotherapy practices. <...

2016
Somayeh Asadi Mehdi Vaez‐zadeh Mohammad Vahidian Mahdieh Marghchouei S. Farhad Masoudi

The aim of the present Monte Carlo study is to evaluate the variation of energy deposition in healthy tissues in the human eye which is irradiated by brachytherapy sources in comparison with the resultant dose increase in the gold nanoparticle (GNP)-loaded choroidal melanoma. The effects of these nanoparticles on normal tissues are compared between 103Pd and 125I as two ophthalmic brachytherapy...

Journal: :nanomedicine research journal 0
hossein khosravi health institute, chmran hospital, tehran, iran. armita mahdavi deparment of basic and clinical research, tehran heart center, tehran university of medical sciences faezeh rahmani department of physics, k. n. toosi university of technology, tehran, iran. ahmad ebadi health institute, chamran hospital, tehran, iran

objective(s): in this study we evaluate the impact of the different aspects of gold nano-particles (gnps) on the target absorptive dose enhancement factor (def) during external targeted radiotherapy with photon beams ranging from kilovolt to megavolt energies using monte carlo simulation. methods: we have simulated the interaction of photon beams with various energies of radiation using water s...

2016
Hossein Khosravi Bijan Hashemi Faezeh Rahmani Ahmad Ebadi

PURPOSE In this work, gold nanoparticles (GNPs) were embedded in the MAGIC-f polymer gel irradiated with the 192Ir brachytherapy sources. MATERIAL AND METHODS At the first plexiglas phantom was made as the human pelvis. The GNPs were synthesized with 15 nm in diameter and 0.1 mM (0.0197 mg/ml) in concentration by using a chemical reduction method. Then, the MAGIC-f gel was synthesized. The fa...

Journal: :علوم پیراپزشکی و بهداشت نظامی 0
سید سلمان ذکریایی seyed salman zakariaee department of radiology, faculty of paramedicine, aja university of medical sciences, tehran, iranگروه رادیولوژی، دانشکده ی پیراپزشکی، دانشگاه علوم پزشکی ارتش، تهران، ایران. ولی اله صبا valiallah saba department of radiology, faculty of paramedicine, aja university of medical sciences, tehran, iranگروه رادیولوژی، دانشکده ی پیراپزشکی، دانشگاه علوم پزشکی ارتش، تهران، ایران.

introduction: in diagnostic and therapeutic procedures, dosimetric studies are performed on the dosimetric systems in order to comply the radiation safety standards. monte carlo methods are used due to the high complexity and cost of patient-specific phantom construction. the high complexity of the digitized phantoms greatly increases the time and computational task of the monte carlo calculati...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید