نتایج جستجو برای: dosimetric audit absolute photon dose linacs

تعداد نتایج: 491847  

Journal: :Medical physics 2007
Priscilla R T L Camargo Laura N Rodrigues Laura Furnari Rodrigo A Rubo

In the present investigation, the necessary tests for implementing a quality assurance program for a commercial treatment planning system (TPS), recently installed at Sao Paulo University School of Medicine Clinicas Hospital-Brazil, was established and performed in accordance with the new IAEA publication TRS 430, and with AAPM Task Group 53. The tests recommended by those documents are classif...

A.H. Barati, H.A. Nedaie, M. Afkhami, M. Yarahmadi, M.H. Zahmatkesh, W. Parwaie,

Background: Accurate small radiation field dosimetry is essential in modern radiotherapy techniques such as stereotactic radiosurgery (SRS) and intensity modulated radiotherapy (IMRT). Precise measurement of dosimetric parameters such as beam profile, percentage depth doses and output factor of these beams are complicated due to the electron disequilibrium and the steep dose gradients. In the p...

2005
H. Ferreira A. Dutreix A. Bridier D. Marre J. Chavaudra H. Svensson

Background and purpose: European Society for Therapeutic Radiology and Oncology (ESTRO) has set up a Quality Assurance network for radiotherapy (EQUAL) carrying out dosimetry audit. Some of the work is done in cooperation with the IAEA. The network deals with measurements performed with mailed TLD irradiated in reference and non-reference conditions, for on-axis points in photons and electrons ...

2014
Mahdi Ghorbani Fateme Salahshour Abbas Haghparast Toktam Ahmadi Moghaddas Courtney Knaup

PURPOSE The aim of this study is to compare the dose in various soft tissues in brachytherapy with photon emitting sources. MATERIAL AND METHODS (103)Pd, (125)I, (169)Yb, (192)Ir brachytherapy sources were simulated with MCNPX Monte Carlo code, and their dose rate constant and radial dose function were compared with the published data. A spherical phantom with 50 cm radius was simulated and t...

Hojjat Khalili Marjaneh Mirsadraie Mehdi Silanian toosi Shokoufeh Mohebbi

Introduction: During treatment of breast cancer, Radiotherapy to the Supraclavicular fossa region results in absorption of radiation by the thyroid gland and consequently leads to hypothyroidism in 40% of patients. The aim of this study was to compare thyroid gland radiation absorption during radiotherapy with different anterior-posterior beam radiation of 6-15 and 15-15 MV pho...

2018
Katherine S. Chen Scott M. Glaser Allison E. Garda John A. Vargo M. Saiful Huq Dwight E. Heron Sushil Beriwal

BACKGROUND Clinical pathways outline criteria for dose homogeneity and critical organ dosimetry. Based upon an internal audit showing suboptimal compliance with dosimetric parameters in whole breast irradiation (WBI), we conducted a mandatory web-based teaching conference for the network. This study reports the impact of this initiative on subsequent treatment plans. METHODS Radiation treatme...

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...

2013
Sergio Righi Evis Karaj Giuseppe Felici Fabio Di Martino

The Novac7 and Liac are linear accelerators (linacs) dedicated to intraoperative radiation therapy (IORT), which produce high energy, very high dose-per-pulse electron beams. The characteristics of the accelerators heads of the Novac7 and Liac are different compared to conventional electron accelerators. The aim of this work was to investigate the specific characteristics of the Novac7 and Liac...

2012
Antony Palmer David Bradley Andrew Nisbet

This study provides a review of recent publications on the physics-aspects of dosimetric accuracy in high dose rate (HDR) brachytherapy. The discussion of accuracy is primarily concerned with uncertainties, but methods to improve dose conformation to the prescribed intended dose distribution are also noted. The main aim of the paper is to review current practical techniques and methods employed...

2015
Praimakorn Liengsawangwong Nanayan Sahoo Xiaoning Ding MingFwu Lii Michale T. Gillin Xiaorong Ronald Zhu Xiaodong Zhang

PURPOSE To evaluate the dosimetric characteristics of a two-dimensional (2D) diode array detector irradiated with passively scattered proton beams. MATERIALS AND METHODS A diode array detector, MapCHECK (Model 1175, Sun Nuclear, Melbourne, FL, USA) was characterized in passive-scattered proton beams. The relative sensitivity of the diodes and absolute dose calibration were determined using a ...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید