نتایج جستجو برای: photon

تعداد نتایج: 70717  

H Gholamhosseinian M Behmadi M Mohammadi, M Momennezhad, M T Bahreyni Toossi, Sh Bayani Sh Naseri,

Background: Given the importance of scattered and low doses in secondary cancer caused by radiation treatment, the point dose of critical organs, which were not subjected to radiation treatment in breast cancer radiotherapy, was measured.Objective: The purpose of this study is to evaluate the peripheral dose in two techniques of breast cancer radiotherapy with two energies. Methods: Eight diff...

Journal: :Nuclear Physics A 1981

Journal: :journal of biomedical physics and engineering 0
sh bazrafkan shiraz university of technology k kazemi shiraz university of technology

background : near infrared spectroscopy imaging is one of the new techniques used for investigating structural and functionality of different body tissues. this is done by injecting light into the medium and measuring the photon intensity at the surface of the tissue. method : in this paper the different medical applications, various imaging and simulation techniques of nirs imaging is describe...

Journal: :Europhysics Letters (EPL) 2000

ژورنال: سنجش و ایمنی پرتو 2019

This research aimed to measure the received photon and thermal neutron doses to contralateral breast (CB) surface in breast cancer radiation therapy for different field sizes in presence of dynamic and physical wedges. The photon and thermal neutron doses were measured by thermo uminescent dosimeter (TLDs) chips for 11 × 13, 11 × 17 and 11 × 21 cm2 field sizes in presence of physical and dynamic ...

Danial Seifi Makrani Tayyeb Pourfallah

Introduction: In the treatment of breast cancer, breast conserving surgery (BCS) and whole breast irradiation is a usual technique. The influence of lumpectomy boost following breast radiotherapy is apparent, but there are different delivery methods. This work intended to compare the dosimetric parameters of electron beams and photon beams for boosting irradiation in breast can...

آقامیری, محمودرضا , باغانی, حمیدرضا , حیدرلو, نعمت الله , مهدوی, ربیع ,

Background and purpose: Beam shaper is a type of applicator used in conjunction with the intraoperative electron radiotherapy. This study aimed at quantitative evaluation of the photon contamination of this applicator using Monte Carlo simulation. Materials and methods: In this experimental study, at first the head of LIAC accelerator was simulated along with the beam shaper applicator using...

Journal: :journal of paramedical sciences 0
danial seifi makrani department of medical physics, faculty of medical sciences, semnan university of medical sciences, semnan, iran hadi hasanzadeh cancer research center, department of medical physics, semnan university of medical sciences, semnan, iran tayyeb allahverdi pourfallah department of biochemistry and biophysics, faculty of medicine, mazandaran university of medical sciences, sari, iran arash ghasemi department of radiology and radiation oncology, faculty of medicine, mazandaran university of medical sciences, sari, iran majid jadidi department of medical physics, faculty of medical sciences, semnan university of medical sciences, semnan, iran hamed babapour guilan oncology center (goc), rasht, iran

the monte carlo method can be used to describe any technique that approximates solutions to quantitative problems through statistical sampling. this method is considered to be the most accurate method for dose calculation in radiotherapy. for complete modeling of a linear accelerator, it is required that the manufactured information covers all data, but some data such as primary electron energy...

Journal: :iranian journal of medical physics 0
hashem rafii-tabar computational physical sciences research laboratory, school of nano science, institute for research in fundamental sciences (ipm), tehran, iran neda rafieiolhosseini department of medical physics and biomedical engineering, school of medicine, shahid beheshti university of medical sciences, tehran, iran

all biological samples emit ultra-low intensity light without any external stimulation. recently, scientific communities have paid particular attention to this phenomenon, known as ultra-weak photon emission (upe). upe has been introduced in the literature as an alternative for biophoton, low-level chemiluminescence and ultra-weak bioluminescence, while it differs from ordinary bioluminescence,...

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 wi...

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