نتایج جستجو برای: dosimetric characteristics

تعداد نتایج: 665504  

2017
Jan Seppälä Sami Suilamo Mikko Tenhunen Liisa Sailas Heli Virsunen Erna Kaleva Jani Keyriläinen

PURPOSE The aim of this study was to compare dosimetric characteristics, monitor unit, and delivery efficiency of 4 different stereotactic body radiotherapy techniques for the treatment of prostate cancer. METHODS This study included 8 patients with localized prostate cancer. Dosimetric assets of 4 delivery techniques for stereotactic body radiotherapy were evaluated: robotic CyberKnife, nonc...

Ali Reza Kamali-Asl Hamid Reza Hemmati Mohammad Reza Javanshir Nematollah Heidarloo, Vahid Lohrabian

Introduction: 192Ir is one of the important sources frequently used in brachytherapy. Up to now, a lot of commercial models of this source have been made which Ir-192 has been recently added to them. The aim of the present study is to determine the dosimetric parameters of this new source model based on the recommendations of TG-43(U1) protocol using Monte Carlo simulation tech...

2010
Jean M. Moran

As the complexity of radiation therapy has increased, the need for quantitative dosimetric evaluation of treatment delivery has also increased. A growing number of investigations have expanded the use of EPIDs from anatomic applications to dosimetric verification. This work focuses on the applications of EPIDs for pre-treatment dosimetric verification of IMRT and intensity modulated arc therapy...

2016
Xiaonan Liu Jing Li Teresa Wu Steven E Schild Michael H Schild William Wong Sujay Vora Mirek Fatyga

AIM To model acute rectal toxicity in Intensity Modulated Radiation Therapy (IMRT) for prostate cancer using dosimetry and patient specific characteristics. METHODS A database of 79 prostate cancer patients treated with image guided IMRT was used to fit parameters of Lyman-Kutcher-Burman (LKB) and logistic regression Normal Tissue Complications Probability (NTCP) models to acute grade ≥ 2 rec...

Ali Asghar Mowlavi, Azam Afzalifar Hamid Reza Baghani, Maryam Bashi

Introduction: The dosimetric characteristics of patch sources including 32P, 90Y, 188Re and 166Ho, which are employed for radionuclide skin therapy, have been evaluated in current study Materials and Methods: The patch sources understudy were modeled by MCNPX Monte Carlo code and corresponding depth dose distribution, transverse dose profile and isodose curves...

Journal: :Medical physics 2011
Timmy Siauw Adam Cunha Alper Atamtürk I-Chow Hsu Jean Pouliot Ken Goldberg

PURPOSE Many planning methods for high dose rate (HDR) brachytherapy require an iterative approach. A set of computational parameters are hypothesized that will give a dose plan that meets dosimetric criteria. A dose plan is computed using these parameters, and if any dosimetric criteria are not met, the process is iterated until a suitable dose plan is found. In this way, the dose distribution...

Journal: :The Tohoku journal of experimental medicine 2007
Masashi Koto Hirohiko Tsujii Naoyoshi Yamamoto Hideki Nishimura Shogo Yamada Tadaaki Miyamoto

Radiation pneumonitis (RP) is one of the most common dose-limiting toxicities in thoracic X-ray radiotherapy (XRT). Dosimetric factors are used for prediction of the occurrence of RP after XRT. Carbon-ion radiotherapy (CRT) is a promising modality because of its excellent dose localization and high biological effect on tumors. This study aims to analyze the relationship between dosimetric facto...

2014
M S Ahmad Fadzil N N H Ramli M A Jusoh T Kadni D A Bradley Mohd Noor

Present investigation aims to establish the dosimetric characteristics of a novel fabricated flat fibre TLD system for postal radiotherapy dose audits. Various thermoluminescence (TL) properties have been investigated for five sizes of 6 mol% Ge-doped optical fibres. Key dosimetric characteristics including reproducibility, linearity, fading and energy dependence have been established. Irradiat...

Journal: :Medical dosimetry : official journal of the American Association of Medical Dosimetrists 2014
Yun Yang Suzanne Catalano Chris R Kelsey David S Yoo Fang-Fang Yin Jing Cai

To quantitatively evaluate dosimetric effects of rotational offsets in stereotactic body radiation therapy (SBRT) for lung cancer. Overall, 11 lung SBRT patients (8 female and 3 male; mean age: 75.0 years) with medially located tumors were included. Treatment plans with simulated rotational offsets of 1°, 3°, and 5° in roll, yaw, and pitch were generated and compared with the original plans. Bo...

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