نتایج جستجو برای: dosimetric audit absolute photon dose linacs

تعداد نتایج: 491847  

2016
Heming Zhen Luo Ouyang Qinan Bao Nan Qin Strahinja Stojadinovic Arnold Pompos

The goal of this work is to evaluate the dosimetric impact of an overshooting phenomenon in step-and-shoot IMRT delivery, and to demonstrate a novel method to mitigate the issue. Five pelvis IMRT patients treated on Varian 2100C EX linacs with larger than +4.5% phantom ion chamber point-dose difference relative to planned dose were investigated. For each patient plan, 5 fractions were delivered...

Journal: :Medical dosimetry : official journal of the American Association of Medical Dosimetrists 2013
James Welsh Arya Amini Katherine Ciura Ngoc Nguyen Matt Palmer Pamela K Allen Michael Paolini Zhongxing Liao Jaques Bluett Radhe Mohan Daniel Gomez James D Cox Ritsuko Komaki Joe Y Chang

Stereotactic body radiotherapy (SBRT) can produce excellent local control of several types of solid tumor; however, toxicity to nearby critical structures is a concern. We found previously that in SBRT for lung cancer, the chest wall (CW) volume receiving 20, 30, or 40Gy (V20, V30, or V40) was linked with the development of neuropathy. Here we sought to determine whether the dosimetric advantag...

A.K. Bhardwaj, A.S. Oinam, S.C. Sharma, S.K. Chakarvarti, T.S. Kehwar,

 Background: To analyze the dosimetric and radio biologic advantages between intensity modulated radiotherapy (IMRT) and 3 dimensional conformal radiotherapy (3DCRT) and selection of optimal photon energy for IMRT treatments. Material and methods: 24 patients with localized prostate carcinoma were planned for 3DCRT and IMRT techniques. Radiation dose of 54 Gy with 2 Gy/fraction, was planned to ...

Journal: :The British Journal of Radiology 2014

2017
Clara Carpeggiani Eugenio Picano Marco Brambilla Claudio Michelassi Juhani Knuuti Philipp Kauffman S. Richard Underwood Danilo Neglia

BACKGROUND Patients with coronary artery disease can accumulate significant radiation dose through repeated exposures to coronary computed tomographic angiography, myocardial perfusion imaging with single photon emission computed tomography or positron emission tomography, and to invasive coronary angiography. Aim of the study was to audit radiation doses of coronary computed tomographic angiog...

1999
Timothy C Zhu

Various types of radiation detectors are used to measure relative dose distributions for therapeutic electron and photon beams. Most detectable signals from a radiation detector are correlated to the energy imparted δε to the detector [1]. This, in turn, is related to the absorbed dose in the detector, Ddet. Table I lists types of radiation detectors, their signals, and their relationship to th...

Journal: :Reports of practical oncology and radiotherapy : journal of Greatpoland Cancer Center in Poznan and Polish Society of Radiation Oncology 2011
Sathiyan Saminathan Ravikumar Manickam Sanjay S Supe

BACKGROUND Wedge filters can be used as missing tissue compensators or wedge pairs to alter the shape of isodose curves so that two beams can be angled with a small hinge angle at a target volume without creating a hotspot. AIM In this study the dosimetric properties of Varian Enhanced Dynamic Wedge (EDW) and physical wedges (PW) were analyzed and compared. MATERIALS AND METHODS Ionometric ...

2010
Petra Trnková Dimos Baltas Andreas Karabis Markus Stock Johannes Dimopoulos Dietmar Georg Richard Pötter Christian Kirisits

PURPOSE The purpose of this study was to compare two inverse planning algorithms for cervical cancer brachytherapy and a conventional manual treatment planning according to the MUW (Medical University of Vienna) protocol. MATERIAL AND METHODS For 20 patients, manually optimized, and, inversely optimized treatment plans with Hybrid Inverse treatment Planning and Optimization (HIPO) and with In...

Journal: :iranian journal of radiation research 0
f. bouzarjomehri shahid sadoughi university of medical sciences, yazd, iran m. kiani tabriz university of medical sciences, medical physics, tabriz, iran a.r. farajollahi tabriz university of medical sciences, medical physics, tabriz, iran

background: the shielding methods in radiotherapy due to delivering an accurate radiation dose to cancer tissues and avoiding unnecessary dose to normal tissues are very important. these methods include lead standard blocks, individual molding and multi leaf collimator (mlc). the mlc method is not still common in iran radiotherapy centers. individual molding is better than the lead block shield...

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