• DocumentCode
    2461306
  • Title

    6 and 15 MeV photon spectra reconstruction using an unfolding depth dose gradient methodology

  • Author

    Juste, B. ; Miro, R. ; Verdu, G. ; Diez, S. ; Campayo, J.M.

  • Author_Institution
    Chem. & Nucl. Eng. Dept., Polytech. Univ. of Valencia, Valencia, Spain
  • fYear
    2011
  • fDate
    Aug. 30 2011-Sept. 3 2011
  • Firstpage
    129
  • Lastpage
    132
  • Abstract
    An accurate knowledge of the spectral distribution emission is essential for precise dose calculations in radiotherapy treatment planning. Reconstruction of photon spectra emitted by medical accelerators from measured depth dose distributions in a water cube is an important tool for commissioning a Monte Carlo treatment planning system. However, the reconstruction problem is an inverse radiation transport function which is poorly conditioned and its solution may become unstable due to small perturbations in the input data. In this paper we present a more stable spectral reconstruction method which can be used to provide an independent confirmation of source models for a given machine without any prior knowledge of the spectral distribution. This technique involves measuring the depth dose curve in a water phantom and applying an unfolding method using Monte Carlo simulated depth dose gradient curves for consecutives mono-energetic beams. We illustrate this theory to calculate a 6 and a 15 MeV photon beam emitted from an Elekta Precise radiotherapy unit using the gradient of depth dose curves in a cube-shaped water tank.
  • Keywords
    Monte Carlo methods; radiation therapy; Elekta Precise radiotherapy unit; Monte Carlo treatment planning system; depth dose gradient curve; depth dose gradient methodology; electron volt energy 15 MeV; electron volt energy 6 MeV; medical accelerators; monoenergetic beams; photon spectra reconstruction; radiotherapy treatment planning; spectral distribution emission; water cube; Algorithms; Computer Simulation; Dose-Response Relationship, Radiation; Models, Biological; Models, Statistical; Radiometry; Radiotherapy Dosage; Radiotherapy Planning, Computer-Assisted; Radiotherapy, Conformal;
  • fLanguage
    English
  • Publisher
    ieee
  • Conference_Titel
    Engineering in Medicine and Biology Society, EMBC, 2011 Annual International Conference of the IEEE
  • Conference_Location
    Boston, MA
  • ISSN
    1557-170X
  • Print_ISBN
    978-1-4244-4121-1
  • Electronic_ISBN
    1557-170X
  • Type

    conf

  • DOI
    10.1109/IEMBS.2011.6089869
  • Filename
    6089869