نتایج جستجو برای: dosimetric characteristics

تعداد نتایج: 665504  

2008
Bojana Šećerov Goran Bačić

Radiation processing in many areas, particularly in radiation sterilization, demands control of the absorbed dose. Many dosimeters have been proposed for the high-level dose range (region of 10 to 50 kGy). However, in addition to the required reproducibility, reliability or uncertainty (< 5%), it is desirable for radiation processing that the selected dosimetric system is easy to operate. One o...

2014
Frank Schneider Sven Clausen Johannes Thölking Frederik Wenz Yasser Abo‐Madyan

The use of IORT as a treatment modality for patients with close or positive margins has increased over the past decade. For situations where a flat area (up to 6 cm in diameter) has to be treated intraoperatively, new applicators for superficial treatment with a miniature X-ray source (INTRABEAM system) were developed. Here we report our evaluation of the dosimetric characteristics of these new...

Journal: :Medical physics 2006
Ali S Meigooni Kai Dou Navid J Meigooni Michael Gnaster Shahid Awan Sharifeh Dini Ellis L Johnson

Grid radiation therapy with megavoltage x-ray beam has been proven to be an effective technique for management of large, bulky malignant tumors. The clinical advantage of GRID therapy, combined with conventional radiation therapy, has been demonstrated using a prototype GRID block [Mohiuddin, Curtis, Grizos, and Komarnicky, Cancer 66, 114-118 (1990)]. Recently, a new GRID block design with impr...

Journal: : 2023

Dosimetric modeling of radiation transport in skeletal bone tissues using computational phantoms provides the doses internal exposure to active marrow. Computational ICRP are created for reference people with anatomical and physiological characteristics typical an average individual. The calculated such will correspond certain population-average values. Individual variability introduce a stocha...

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...

Maryam Hazbavi, Marziyeh Tahmasbi Mohammad Javad Tahmasebi Birgani Nahid Chegeni

Introduction: Many studies have shown the effects of delivered dose distribution due to the incident photon energy on the tumor and healthy tissues. The ability to access the most appropriate radiation energy is essential to achieve the optimal treatment planning but there is a serious limitation in number of energies available on radiation therapy machines can restrict it. <s...

2011
Dale W. Litzenberg Hanan Amro Joann I. Prisciandaro Eduardo Acosta Ian Gallagher Don A. Roberts

The purpose of this study was to determine the dosimetric impact of density variations observed in water-equivalent solid slabs. Measurements were performed using two 30 cm × 30 cm water-equivalent slabs, one being 4 cm think and the other 5 cm thick. The location and extent of density variations were determined by computed tomography (CT) scans. Additional imaging measurements were made with a...

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...

Journal: :iranian journal of radiation research 0
m.b. tavakoli department of medical physics and medical engineering, school of medicine, isfahan university of medical sciences, isfahan, iran d. shahbazi-gahrouei department of medical physics and medical engineering, school of medicine, isfahan university of medical sciences, isfahan, iran m. hosseinpour department of medical physics and medical engineering, school of medicine, isfahan university of medical sciences, isfahan, iran

background: for an effective treatment planning in brachytherapy, it is necessary to know the accurate source dosimetric information such as air kerma strength, exposure rate constant, dose rate constant and redial dose distribution. the usual method to determine these factors is thermo luminescent dosimeter (tld) dosimetry. nowadays, another more accurate method is known to be the monte carlo ...

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