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Title: Automatic determination of primary electron beam parameters in Monte Carlo simulation

Abstract

In order to obtain realistic and reliable Monte Carlo simulations of medical linac photon beams, an accurate determination of the parameters that define the primary electron beam that hits the target is a fundamental step. In this work we propose a new methodology to commission photon beams in Monte Carlo simulations that ensures the reproducibility of a wide range of clinically useful fields. For such purpose accelerated Monte Carlo simulations of 2x2, 10x10, and 20x20 cm{sup 2} fields at SSD=100 cm are carried out for several combinations of the primary electron beam mean energy and radial FWHM. Then, by performing a simultaneous comparison with the correspondent measurements for these same fields, the best combination is selected. This methodology has been employed to determine the characteristics of the primary electron beams that best reproduce a Siemens PRIMUS and a Varian 2100 CD machine in the Monte Carlo simulations. Excellent agreements were obtained between simulations and measurements for a wide range of field sizes. Because precalculated profiles are stored in databases, the whole commissioning process can be fully automated, avoiding manual fine-tunings. These databases can also be used to characterize any accelerators of the same model from different sites.

Authors:
; ; ; ;  [1];  [2];  [3]
  1. Departamento de Fisica de Particulas, Facultade de Fisica, Universidade de Santiago de Compostela (Spain)
  2. (Spain)
  3. (Germany)
Publication Date:
OSTI Identifier:
20951094
Resource Type:
Journal Article
Resource Relation:
Journal Name: Medical Physics; Journal Volume: 34; Journal Issue: 3; Other Information: DOI: 10.1118/1.2514155; (c) 2007 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; COMMISSIONING; COMPUTERIZED SIMULATION; ELECTRON BEAMS; LINEAR ACCELERATORS; MONTE CARLO METHOD; PHOTON BEAMS; RADIOTHERAPY; TUNING

Citation Formats

Pena, Javier, Gonzalez-Castano, Diego M., Gomez, Faustino, Sanchez-Doblado, Francisco, Hartmann, Guenther H., Hospital Universitario Virgen Macarena, Radiofisica and Departamento de Fisiologia Medica y Biofisica, Facultad de Medicina, Universidad de Sevilla, and Deutsches Krebsforschungszentrum, Abt. Medizinische Physik, Heidelberg. Automatic determination of primary electron beam parameters in Monte Carlo simulation. United States: N. p., 2007. Web. doi:10.1118/1.2514155.
Pena, Javier, Gonzalez-Castano, Diego M., Gomez, Faustino, Sanchez-Doblado, Francisco, Hartmann, Guenther H., Hospital Universitario Virgen Macarena, Radiofisica and Departamento de Fisiologia Medica y Biofisica, Facultad de Medicina, Universidad de Sevilla, & Deutsches Krebsforschungszentrum, Abt. Medizinische Physik, Heidelberg. Automatic determination of primary electron beam parameters in Monte Carlo simulation. United States. doi:10.1118/1.2514155.
Pena, Javier, Gonzalez-Castano, Diego M., Gomez, Faustino, Sanchez-Doblado, Francisco, Hartmann, Guenther H., Hospital Universitario Virgen Macarena, Radiofisica and Departamento de Fisiologia Medica y Biofisica, Facultad de Medicina, Universidad de Sevilla, and Deutsches Krebsforschungszentrum, Abt. Medizinische Physik, Heidelberg. Thu . "Automatic determination of primary electron beam parameters in Monte Carlo simulation". United States. doi:10.1118/1.2514155.
@article{osti_20951094,
title = {Automatic determination of primary electron beam parameters in Monte Carlo simulation},
author = {Pena, Javier and Gonzalez-Castano, Diego M. and Gomez, Faustino and Sanchez-Doblado, Francisco and Hartmann, Guenther H. and Hospital Universitario Virgen Macarena, Radiofisica and Departamento de Fisiologia Medica y Biofisica, Facultad de Medicina, Universidad de Sevilla and Deutsches Krebsforschungszentrum, Abt. Medizinische Physik, Heidelberg},
abstractNote = {In order to obtain realistic and reliable Monte Carlo simulations of medical linac photon beams, an accurate determination of the parameters that define the primary electron beam that hits the target is a fundamental step. In this work we propose a new methodology to commission photon beams in Monte Carlo simulations that ensures the reproducibility of a wide range of clinically useful fields. For such purpose accelerated Monte Carlo simulations of 2x2, 10x10, and 20x20 cm{sup 2} fields at SSD=100 cm are carried out for several combinations of the primary electron beam mean energy and radial FWHM. Then, by performing a simultaneous comparison with the correspondent measurements for these same fields, the best combination is selected. This methodology has been employed to determine the characteristics of the primary electron beams that best reproduce a Siemens PRIMUS and a Varian 2100 CD machine in the Monte Carlo simulations. Excellent agreements were obtained between simulations and measurements for a wide range of field sizes. Because precalculated profiles are stored in databases, the whole commissioning process can be fully automated, avoiding manual fine-tunings. These databases can also be used to characterize any accelerators of the same model from different sites.},
doi = {10.1118/1.2514155},
journal = {Medical Physics},
number = 3,
volume = 34,
place = {United States},
year = {Thu Mar 15 00:00:00 EDT 2007},
month = {Thu Mar 15 00:00:00 EDT 2007}
}