Results 211 to 220 of about 506,839 (244)

Assessment of Out-of-Field Doses in Radiotherapy of Brain Lesions in Children

International Journal of Radiation Oncology*Biology*Physics, 2011
To characterize the out-of-field doses in pediatric radiotherapy and to identify simple methods by which out-of-field dose might be minimized, with a view to reducing the risk of secondary cancers.With the aim of characterizing the peripheral doses under different treatment conditions, the dose measurements in an anthropomorphic child phantom were ...
Michael L, Taylor, Tomas, Kron, Rick D, Franich   +2 more
openaire   +2 more sources

Characterization of Extrafocal Dose Influence on the Out-of-Field Dose Distribution by Monte Carlo Simulations and Dose Measurements

Health Physics, 2019
Abstract Out-of-field scattered and transmitted extrafocal radiation may induce secondary cancer in long-term survivors of external radiotherapy. Pediatric patients have higher life expectancy and tend to receive higher secondary radiation damage due to geometric and biological factors.
Firass, Ghareeb, Joana, Lencart, Jorge, Oliveira, João A M, Santos   +3 more
openaire   +2 more sources

Out-of-field dose and its constituent components for a 1.5 T MR-Linac

Physics in Medicine & Biology, 2021
Abstract This study aims to quantify the relative contributions of phantom scatter, collimator scatter and head leakage to the out-of-field doses (OFDs) of both static fields and clinical intensity-modulated radiation therapy (IMRT) treatments in a 1.5 T MR-Linac.
Bin Yang, Ka Keung Tang, Chen-Yu Huang, Hui Geng, Wai Wang Lam, Yeung Sum Wong, Mei Yan Tse, Ka Ki Lau, Kin Yin Cheung, Siu Ki Yu   +9 more
openaire   +2 more sources

Out-of-field Dose for Scanned and Scattered Proton Beams

AIP Conference Proceedings, 2009
The dose delivered outside of the primary field to non‐target tissues is of concern in all types of radiotherapy. For a given radiation type, this dose is dependent upon the delivery technique. Proton beams may be spread laterally to cover the target volume using scattering foils or magnetic scanning.
Michael F. Moyers, Floyd D. McDaniel, Barney L. Doyle   +2 more
openaire   +1 more source

Out of Field Doses in Clinical Photon and Proton Beam

AIP Conference Proceedings, 2010
Out‐of‐field doses in homogenous cubical polymethylmethacrylate (PMMA) phantom were studied in this work. Measurements were performed in clinical 171 MeV proton and megavoltae photon beam. As detectors, CaSO:Dy thermoluminescent detectors were used. According to expectancy, results showed that out‐of‐field doses are substantially lower for clinical ...
Ján Kubančák, Carlos Granja, Claude Leroy   +2 more
openaire   +1 more source

Out-of-field doses in radiotherapy: Input to epidemiological studies and dose-risk models

Physica Medica, 2017
Out-of-field doses in radiotherapy have been increasingly studied in recent years because of the generally improved survival of patients who have received radiotherapy as part of their treatment for cancer and their subsequent risk of a second malignancy.
openaire   +2 more sources

Poster — Thur Eve — 36: Out‐of‐Field dose in craniospinal irradiation

Medical Physics, 2012
The risk of radiotherapy induced secondary cancer depends on the integral dose delivered to the patient where the dose delivered within the radiation field is accounted for, as well as dose to out‐of‐field organs from scattered and leakage radiation.
W, Jalbout, R, Howell, W, Newhauser, F, Geara, N, Khater, P, Taddei   +5 more
openaire   +2 more sources

Out-of-field dose measurements for radiotherapy of brain tumours in paediatric patients

Physica Medica, 2014
It has been known for many years that out-of-field radiation doses to normal tissues may be associated with an increased risk of secondary cancers. Paediatric patients are of particular concern due to their possible longer life expectancy and higher organ radiosensitivities compared with adult patients and higher organ doses because of their smaller ...
L. Stolarczyk, M. Majer, N. Adamek, E. Gora, D. Kabat, Ž. Knežević, M. Liszka, P. Olko, S. Miljanić, R. Harrison   +9 more
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Out-of-field dose measurements in radiotherapy

2011
This thesis describes the results from measurements of the out-of-field dose in radiotherapy. The dose outside the treatment volume has been determined in a water phantom and an anthropomorphic phantom. Measurements were performed with linac photons, passively delivered protons, scanned protons, passively delivered carbon ions as well as scanned carbon
openaire   +1 more source

Calculation of out‐of‐field dose distribution in carbon‐ion radiotherapy by Monte Carlo simulation

Medical Physics, 2012
Purpose:Recent radiotherapy technologies including carbon‐ion radiotherapy can improve the dose concentration in the target volume, thereby not only reducing side effects in organs at risk but also the secondary cancer risk within or near the irradiation field.
Shunsuke, Yonai, Naruhiro, Matsufuji, Masao, Namba   +2 more
openaire   +2 more sources