Consistency and reproducibility of the VMAT plan delivery using three independent validation methods

Varatharaj Chandraraj, Sotirios Stathakis, Ravikumar Manickam, Carlos Esquivel, Sanjay S. Supe, Nikos Papanikolaou

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


The complexity of VMAT delivery requires new methods and potentially new tools for the commissioning of these systems. It appears that great consideration is needed for quality assurance (QA) of these treatments since there are limited devices that are dedicated to the QA of rotational delivery. In this present study, we have evaluated the consistency and reproducibility of one prostate and one lung VMAT plans for 31 consecutive days using three different approaches: 1) MLC DynaLog files, 2) in vivo measurements using the multiwire ionization chamber DAVID, and 3) using PTWseven29 2D ARRAY with the OCTAVIUS phantom at our Varian Clinac linear accelerator. Overall, the three methods of testing the reproducibility and consistency of the VMAT delivery were in agreement with each other. All methods showed minimal daily deviations that contributed to clinically insignificant dose variations from day to day. Based on our results, we conclude that the VMAT delivery using a Varian 2100CD linear accelerator equipped with 120 MLC is highly reproducible.

Original languageEnglish (US)
Pages (from-to)129-140
Number of pages12
JournalJournal of Applied Clinical Medical Physics
Issue number1
StatePublished - 2011


  • DynaLog files
  • PTW seven29 ARRAY
  • Quality assurance
  • VMAT

ASJC Scopus subject areas

  • Instrumentation
  • Radiation
  • Radiology Nuclear Medicine and imaging


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