Journal of the Korean Physical Society

Korean Physical Society (한국물리학회)
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GEANT4-based Monte Carlo Simulation of Beam Quality Correction Factors for the Leksell Gamma Knife® PerfexionTM

  • Schaarschmidt, Thomas (Department of Nuclear Engineering, Hanyang University) ;
  • Kim, Tae Hoon (Department of Nuclear Engineering, Hanyang University) ;
  • Kim, Yong Kyun (Department of Nuclear Engineering, Hanyang University) ;
  • Yang, Hye Jeong (Department of Biomedicine & Health Sciences and Biomedical Engineering, Catholic University College of Medicine) ;
  • Chung, Hyun-Tai (Department of Neurosurgery, Seoul National University College of Medicine)
  • Received : 2018.09.19
  • Accepted : 2018.11.09
  • Published : 2018.12.30
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Abstract

With the publication of TRS-483 in late 2017 the IAEA has established an international code of practice for reference dosimetry in small and non-standard fields based on a formalism first suggested by Alfonso et al. in 2008. However, data on beam quality correction factors ($k^{f_{msr},f_{ref}}_{Q_{msr},Q_0}$) for the Leksell Gamma $Knife^{(R)}$ $Perfexion^{TM}$ is scarce and what little data is available was obtained under conditions not necessarily in accordance with the IAEA's recommendations. This study constitutes the first systematic attempt to calculate those correction factors by applying the new code of practice to Monte Carlo simulation using the GEANT4 toolkit. $k^{f_{msr},f_{ref}}_{Q_{msr},Q_0}$ values were determined for three common ionization chamber detectors and five different phantom materials, with results indicating that in most phantom materials, all chambers were well suited for reference dosimetry with the Gamma $Knife^{(R)}$. Similarities and differences between the results of this study and previous ones were also analyzed and it was found that the results obtained herein were generally in good agreement with earlier PENELOPE and EGSnrc studies.

Keywords

Acknowledgement

Supported by : Korea Agency for Technology and Standards

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