Document Detail


Electron beam modeling and commissioning for Monte Carlo treatment planning.
MedLine Citation:
PMID:  10659756     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A hybrid approach for commissioning electron beam Monte Carlo treatment planning systems has been studied. The approach is based on the assumption that accelerators of the same type have very similar electron beam characteristics and the major difference comes from the on-site tuning of the electron incident energy at the exit window. For one type of accelerator, a reference machine can be selected and simulated with the Monte Carlo method. A multiple source model can be built on the full Monte Carlo simulation of the reference beam. When commissioning electron beams from other accelerators of the same type, the energy spectra in the source model are tuned to match the measured dose distributions. A Varian Clinac 2100C accelerator was chosen as the reference machine and a four-source beam model was established based on the Monte Carlo simulations. This simplified beam model can be used to generate Monte Carlo dose distributions accurately (within 2%/2 mm compared to those calculated with full phase space data) for electron beams from the reference machine with various nominal energies, applicator sizes, and SSDs. Three electron beams were commissioned by adjusting the energy spectra in the source model. The dose distributions calculated with the adjusted source model were compared with the dose distributions calculated using the phase space data for these beams. The agreement is within 1% in most of cases and 2% in all situations. This preliminary study has shown the capability of the commissioning approach for handling large variation in the electron incident energy. The possibility of making the approach more versatile is also discussed.
Authors:
S B Jiang; A Kapur; C M Ma
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Medical physics     Volume:  27     ISSN:  0094-2405     ISO Abbreviation:  Med Phys     Publication Date:  2000 Jan 
Date Detail:
Created Date:  2000-03-03     Completed Date:  2000-03-03     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0425746     Medline TA:  Med Phys     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  180-91     Citation Subset:  IM    
Affiliation:
Department of Radiation Oncology, Stanford University School of Medicine, California 94305-5304, USA. stevej@reyes.stanford.edu
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MeSH Terms
Descriptor/Qualifier:
Algorithms
Biophysical Phenomena
Biophysics
Electrons
Humans
Models, Statistical
Monte Carlo Method
Particle Accelerators
Phantoms, Imaging
Radiotherapy Planning, Computer-Assisted / statistics & numerical data*
Radiotherapy, High-Energy / methods*,  statistics & numerical data
Grant Support
ID/Acronym/Agency:
CA78331/CA/NCI NIH HHS

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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