نتایج جستجو برای: dosimetric characteristics beam shaper applicator conventional applicator

تعداد نتایج: 1010248  

آقامیری, سید محمود رضا, باغانی, حمیدرضا, حیدرلو, نعمت‌الله, مهدوی, سید ربیع,

Intraoperative electron radiotherapy is one of the radiotherapy methods that delivers a high single fraction of radiation dose to the patient in one session during the surgery. Beam shaper applicator is one of the applicators that is recently employed with this radiotherapy method. This applicator has a considerable application in treatment of large tumors. In this study, the dosimetric charact...

Hamid Reza Baghani, Nematollah Heidarloo, Seyed Mahmoud Reza Aghamiri

Introduction: Intraoperative electron radiation therapy (IOERT) is one of the cancer treatment techniques that delivers high doses to tumor bed during surgery. IOERT can be performed by either conventional LINACs or dedicated IORT accelerators such as LIAC (Light Intraoperative Accelerator). Two types of applicators can be used with LIAC dedicated accelerator including conventi...

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...

E Akbari, H R Baghani H R Mirzaei K Tanha, M Mousavi, M Robatjazi, N Nafissi, S R Mahdavi,

Background: One of the main problems of dedicated IORT accelerators is to determine dosimetric characteristics of the electron beams. Monte Carlo simulation of IORT accelerator head and produced beam will be useful to improve the accuracy of beam dosimetry.Materials and Methods: Liac accelerator head was modeled using the BEAMnrcMonte Carlo simulation system. Phase-space files were generated at...

2015
Hamid Reza Baghani Seyed Mahmoud Reza Aghamiri Seyed Rabi Mahdavi Mohammad Esmail Akbari Hamid Reza Mirzaei

The specific design of the mobile dedicated intraoperative radiotherapy (IORT) accelerators and different electron beam collimation system can change the dosimetric characteristics of electron beam with respect to the conventional accelerators. The aim of this study is to measure and compare the dosimetric characteristics of electron beam produced by intraoperative and conventional radiotherapy...

Journal: :journal of biomedical physics and engineering 0
m robatjazi tehran university of medical sciences k tanha bushehr university of medical sciences s r mahdavi iran university of medical sciences h r baghani shahid beheshti university h r mirzaei shahid beheshti university of medical sciences m mousavi tehran university of medical sciences

background: one of the main problems of dedicated iort accelerators is to determine dosimetric characteristics of the electron beams. monte carlo simulation of iort accelerator head and produced beam will be useful to improve the accuracy of beam dosimetry. materials and methods: liac accelerator head was modeled using the beamnrcmonte carlo simulation system. phase-space files were generated a...

2010
Sanaz Hariri Tabrizi Seyyed Mahmoud Reza Aghamiri Siamak Najarian Ramin Jaberi

High dose rate (HDR) brachytherapy is one of the accepted treatment modalities in gastro-intestinal tract and bladder carcinomas. Considering the shortcoming of contact brachytherapy routinely used in gastrointestinal tract in treatment of big tumors or invasive method of bladder treatment, an intraluminal applicator with the capability of insertion into the tumor depth seems to be useful. This...

ژورنال: سنجش و ایمنی پرتو 2015

With the development of science and technology in the medical field and need more than ever to accuracy and quality of treatment has been causer increase different radiotherapy methods. Almost the past two decade’s intraoperative radiation therapy (IORT) as one of the new techniques used to treat cancer patients. One of the problems with this method is obtaining accurate dosimetry, becaus...

Hamid Reza Baghani, Mostafa Robatjazi, Seyed Rabi Mahdavi

Introduction: Intraoperative radiotherapy is a radiotherapy technique in which a high single fraction of radiation dose is delivered to the patient after surgery and Concurrent with anesthesia time. The most frequent method for IORT implementation is Intraoperative electron radiotherapy (IOERT), in which, some dedicated and high dose per pulse electron accelerators are employe...

2010
Alexander Nevelsky Zvi Bernstein Raquel Bar‐Deroma Abraham Kuten Itzhak Orion

The design concept and dosimetric characteristics of a new applicator system for intraoperative radiation therapy (IORT) are presented in this work. A new hard-docking commercial system includes polymethylmethacrylate (PMMA) applicators with different diameters and applicator end angles and a set of secondary lead collimators. A telescopic device allows changing of source-to-surface distance (S...

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