Monte carlo modeling of a novalis TX Varian 6 MV with HD-120 multileaf collimator

Luis Alberto Vazquez-Quino, Brian Massingill, Chengyu Shi, Alonso Gutierrez, Carlos Esquivel, Tony Eng, Nikos Papanikolaou, Sotirios Stathakis

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


A Monte Carlo model of the Novalis Tx linear accelerator equipped with high-definition multileaf collimator (HD-120 HD-MLC) was commissioned using ionization chamber measurements in water. All measurements in water were performed using a liquid filled ionization chamber. Film measurements were made using EDR2 film in solid water. Open rectangular fields defined by the jaws or the HD-MLC were used for comparison against measurements. Furthermore, inter- and intraleaf leakage calculated by the Monte Carlo model was compared against film measurements. The statistical uncertainty of the Monte Carlo calculations was less than 1% for all simulations. Results for all regular field sizes show an excellent agreement with commissioning data (percent depth-dose curves and profiles), well within 1% of difference in the relative dose and 1 mm distance to agreement. The computed leakage through HD-MLCs shows good agreement with film measurements. The Monte Carlo model developed in this study accurately represents the new Novalis Tx Varian linac with HD-MLC and can be used for reliable patient dose calculations.

Original languageEnglish (US)
Pages (from-to)300-313
Number of pages14
JournalJournal of Applied Clinical Medical Physics
Issue number5
StatePublished - 2012


  • BEAMnrc
  • DOSXYZnrc
  • HD-MLC
  • Linac
  • Monte Carlo simulations
  • Novalis TX

ASJC Scopus subject areas

  • Instrumentation
  • Radiation
  • Radiology Nuclear Medicine and imaging


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