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Monte Carlo based verification of a beam model used in a treatment planning system

Wieslander, Elinore LU and Knöös, Tommy LU (2008) International Workshop on Monte Carlo Techniques in Radiotherapy Delivery and Verification In Journal of Physics: Conference Series 102. p.012027-012027
Abstract
Modern treatment planning systems (TPSs) usually separate the dose modelling into a beam modelling phase, describing the beam exiting the accelerator, followed by a subsequent dose calculation in the patient. The aim of this work is to use the Monte Carlo code system EGSnrc to study the modelling of head scatter as well as the transmission through multi-leaf collimator (MLC) and diaphragms in the beam model used in a commercial TPS (MasterPlan, Nucletron B. V.). An Elekta Precise linear accelerator equipped with an MLC has been modelled in BEAMnrc, based on available information from the vendor regarding the material and geometry of the treatment head. The collimation in the MLC direction consists of leafs which are complemented with a... (More)
Modern treatment planning systems (TPSs) usually separate the dose modelling into a beam modelling phase, describing the beam exiting the accelerator, followed by a subsequent dose calculation in the patient. The aim of this work is to use the Monte Carlo code system EGSnrc to study the modelling of head scatter as well as the transmission through multi-leaf collimator (MLC) and diaphragms in the beam model used in a commercial TPS (MasterPlan, Nucletron B. V.). An Elekta Precise linear accelerator equipped with an MLC has been modelled in BEAMnrc, based on available information from the vendor regarding the material and geometry of the treatment head. The collimation in the MLC direction consists of leafs which are complemented with a backup diaphragm. The characteristics of the electron beam, i. e., energy and spot size, impinging on the target have been tuned to match measured data. Phase spaces from simulations of the treatment head are used to extract the scatter from, e. g., the flattening filter and the collimating structures. Similar data for the source models used in the TPS are extracted from the treatment planning system, thus a comprehensive analysis is possible. Simulations in a water phantom, with DOSXYZnrc, are also used to study the modelling of the MLC and the diaphragms by the TPS. The results from this study will be helpful to understand the limitations of the model in the TPS and provide knowledge for further improvements of the TPS source modelling. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
Journal of Physics: Conference Series
volume
102
pages
012027 - 012027
publisher
IOP Publishing
conference name
International Workshop on Monte Carlo Techniques in Radiotherapy Delivery and Verification
external identifiers
  • wos:000284328500027
  • scopus:44649130176
ISSN
1742-6596
1742-6588
DOI
10.1088/1742-6596/102/1/012027
language
English
LU publication?
yes
id
36f79baa-e18e-4627-81cf-5cd7edce4987 (old id 1749970)
date added to LUP
2010-12-27 11:14:19
date last changed
2017-08-27 04:17:38
@inproceedings{36f79baa-e18e-4627-81cf-5cd7edce4987,
  abstract     = {Modern treatment planning systems (TPSs) usually separate the dose modelling into a beam modelling phase, describing the beam exiting the accelerator, followed by a subsequent dose calculation in the patient. The aim of this work is to use the Monte Carlo code system EGSnrc to study the modelling of head scatter as well as the transmission through multi-leaf collimator (MLC) and diaphragms in the beam model used in a commercial TPS (MasterPlan, Nucletron B. V.). An Elekta Precise linear accelerator equipped with an MLC has been modelled in BEAMnrc, based on available information from the vendor regarding the material and geometry of the treatment head. The collimation in the MLC direction consists of leafs which are complemented with a backup diaphragm. The characteristics of the electron beam, i. e., energy and spot size, impinging on the target have been tuned to match measured data. Phase spaces from simulations of the treatment head are used to extract the scatter from, e. g., the flattening filter and the collimating structures. Similar data for the source models used in the TPS are extracted from the treatment planning system, thus a comprehensive analysis is possible. Simulations in a water phantom, with DOSXYZnrc, are also used to study the modelling of the MLC and the diaphragms by the TPS. The results from this study will be helpful to understand the limitations of the model in the TPS and provide knowledge for further improvements of the TPS source modelling.},
  author       = {Wieslander, Elinore and Knöös, Tommy},
  booktitle    = {Journal of Physics: Conference Series},
  issn         = {1742-6596},
  language     = {eng},
  pages        = {012027--012027},
  publisher    = {IOP Publishing},
  title        = {Monte Carlo based verification of a beam model used in a treatment planning system},
  url          = {http://dx.doi.org/10.1088/1742-6596/102/1/012027},
  volume       = {102},
  year         = {2008},
}