Korean J Med Phys.  2007 Sep;18(3):126-133.

A Monte Carlo Simulation for the Newly Developed Head-and-Neck IMRT Phantom: a Pilot Study

  • 1Department of Radiation Oncology, College of Medicine, Hallym University. seikang@hallym.or.kr
  • 2Department of Radiation Oncology, College of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine.
  • 3Department of Radiation Oncology, College of Medicine, Asan Medical Center, College of Medicine, University of Ulsan.
  • 4Korea Food and Drug Administration (KFDA).


A head-and-neck phantom was designed in order to evaluate remotely the quality of the delivery dose of intensity modulated radiation therapy (IMRT) in each institution. The phantom is homogeneous or inhomogeneous by interchanging the phantom material with the substructure like an air or bone plug. Monte Carlo simulations were executed for one beam and three beams to the phantom and compared with ion chamber and thermoluminescent dosimeter (TLD) measurements of which readings were from two independent institutions. For single beam, the ion chamber results and the MC simulations agreed to within about 2%. TLDs agreed with the MC results to within 2% or 7% according to which institution read the TLDs. For three beams, the ion chamber results showed -5% maximum discrepancy and those of TLDs were +2~+3%. The accuracy of the TLD readings should be increased for the remote dose monitoring. MC simulations are a valuable tool to acquire the reliability of the measurements in developing a new phantom.


IMRT phantom; Monte Carlo simulation; Remote dose monitoring; Ion chamber; TLD

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