scholarly journals Monte Carlo study of the depth-dependent fluence perturbation in parallel-plate ionization chambers in electron beams

2014 ◽  
Vol 41 (11) ◽  
pp. 111707 ◽  
Author(s):  
K. Zink ◽  
D. Czarnecki ◽  
H. K. Looe ◽  
P. von Voigts-Rhetz ◽  
D. Harder
Keyword(s):  
Monte Carlo ◽  
Parallel Plate ◽  
Electron Beams ◽  
Monte Carlo Study ◽  
Ionization Chambers

A Monte Carlo study of backscatter in the monitor ion chamber for clinical photon and electron beams

2000 ◽  
pp. 466-468 ◽  
Author(s):  
Frank Verhaegen ◽  
Richard Symonds-Tayler ◽  
Cephas Mubata ◽  
Margaret Bidmead ◽  
Alan Nahum ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Electron Beams ◽  
Monte Carlo Study ◽  
Ion Chamber

scholarly journals A Monte Carlo study on dose enhancement and photon contamination production by various nanoparticles in electron mode of a medical linac

Nukleonika ◽  
2015 ◽  
Vol 60 (3) ◽  
pp. 489-496 ◽  
Author(s):  
Mohammad Taghi Bahreyni Toossi ◽  
Mahdi Ghorbani ◽  
Leila Sobhkhiz Sabet ◽  
Fateme Akbari ◽  
Mohammad Mehrpouyan
Keyword(s):  
Monte Carlo ◽  
Electron Beams ◽  
Monte Carlo Study ◽  
Monte Carlo Code ◽  
Dose Enhancement ◽  
Electron Dose ◽  
Additional Advantage ◽  
Photon Dose ◽  
Electron Mode ◽  
Medical Linac

Abstract The aim of this study is the evaluation of electron dose enhancement and photon contamination production by various nanoparticles in the electron mode of a medical linac. MCNPX Monte Carlo code was used for simulation of Siemens Primus linac as well as a phantom and a tumor loaded with nanoparticles. Electron dose enhancement by Au, Ag, I and Fe2O3 nanoparticles of 7, 18 and 30 mg/ml concentrations for 8, 12 and 14 MeV electrons was calculated. The increase in photon contamination due to the presence of the nanoparticles was evaluated as well. The above effects were evaluated for 500 keV and 10 keV energy cut-offs defined for electrons and photons. For 500 keV energy cut-off, there was no significant electron dose enhancement. However, for 10 keV energy cut-off, a maximum electron dose enhancement factor of 1.08 was observed for 30 mg/ml of gold nanoparticles with 8 MeV electrons. An increase in photon contamination due to nanoparticles was also observed which existed mainly inside the tumor. A maximum photon dose increase factor of 1.07 was observed inside the tumor with Au nanoparticles. Nanoparticles can be used for the enhancement of electron dose in the electron mode of a linac. Lower energy electron beams, and nanoparticles with higher atomic number, can be of greater benefit in this field. Photons originating from nanoparticles will increase the photon dose inside the tumor, and will be an additional advantage of the use of nanoparticles in radiotherapy with electron beams.

scholarly journals Qualitative analysis of irregular fields delivered with dual electron multileaf collimator: A Monte Carlo study

2016 ◽  
Vol 22 (1) ◽  
pp. 5-9
Author(s):  
Samuel Okon Inyang ◽  
Alan Chamberlain
Keyword(s):  
Monte Carlo ◽  
Electron Beam ◽  
Qualitative Analysis ◽  
Monte Carlo Simulations ◽  
Electron Beams ◽  
Monte Carlo Study ◽  
Multileaf Collimator ◽  
Water Phantom ◽  
Electron Beam Therapy

Abstract The use of a dual electron multileaf collimator (eMLC) to collimate therapeutic electron beam without the use of cutouts has been previously shown to be feasible. Further Monte Carlo simulations were performed in this study to verify the nature and appearance of the isodose distribution in water phantom of irregular electron beams delivered by the eMLC. Electron fields used in this study were selected to reflect those used in electron beam therapy. Results of this study show that the isodose distribution in a water phantom obtained from the simulation of irregular electron beams through the eMLC conforms to the pattern of the eMLC used in the delivery of the beam. It is therefore concluded that the dual eMLC could deliver isodose distributions reflecting the pattern of the eMLC field that was used in the delivery of the beam.

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