Modeling Elekta VersaHD using the Varian Eclipse treatment planning system for photon beams

A single-institution experience

You Zhang, Anh H. Le, Zhen Tian, Zohaib Iqbal, Tsuicheng Chiu, Xuejun Gu, Andrei Pugachev, Robert Ray Reynolds Jr., Yang K. Park, Mu-Han Lin, Strahinja Stojadinovic

Research output: Contribution to journalArticle

Abstract

The aim of this study was to report a single-institution experience and commissioning data for Elekta VersaHD linear accelerators (LINACs) for photon beams in the Eclipse treatment planning system (TPS). Two VersaHD LINACs equipped with 160-leaf collimators were commissioned. For each energy, the percent-depth-dose (PDD) curves, beam profiles, output factors, leaf transmission factors and dosimetric leaf gaps (DLGs) were acquired in accordance with the AAPM task group reports No. 45 and No. 106 and the vendor-supplied documents. The measured data were imported into Eclipse TPS to build a VersaHD beam model. The model was validated by creating treatment plans spanning over the full-spectrum of treatment sites and techniques used in our clinic. The quality assurance measurements were performed using MatriXX, ionization chamber, and radiochromic film. The DLG values were iteratively adjusted to optimize the agreement between planned and measured doses. Mobius, an independent LINAC logfile-based quality assurance tool, was also commissioned both for routine intensity-modulated radiation therapy (IMRT) QA and as a secondary check for the Eclipse VersaHD model. The Eclipse-generated VersaHD model was in excellent agreement with the measured PDD curves and beam profiles. The measured leaf transmission factors were less than 0.5% for all energies. The model validation study yielded absolute point dose agreement between ionization chamber measurements and Eclipse within ±4% for all cases. The comparison between Mobius and Eclipse, and between Mobius and ionization chamber measurements lead to absolute point dose agreement within ±5%. The corresponding 3D dose distributions evaluated with 3%global/2mm gamma criteria resulted in larger than 90% passing rates for all plans. The Eclipse TPS can model VersaHD LINACs with clinically acceptable accuracy. The model validation study and comparisons with Mobius demonstrated that the modeling of VersaHD in Eclipse necessitates further improvement to provide dosimetric accuracy on par with Varian LINACs.

Original languageEnglish (US)
JournalJournal of Applied Clinical Medical Physics
DOIs
StateAccepted/In press - Jan 1 2019

Fingerprint

Particle Accelerators
photon beams
eclipses
Photons
planning
Linear accelerators
linear accelerators
Planning
leaves
Ionization chambers
dosage
Validation Studies
ionization chambers
Quality assurance
assurance
Therapeutics
Dosimetry
Radiotherapy
curves
collimators

Keywords

  • commissioning
  • Eclipse
  • Elekta
  • treatment planning system
  • varian
  • VersaHD

ASJC Scopus subject areas

  • Radiation
  • Instrumentation
  • Radiology Nuclear Medicine and imaging

Cite this

Modeling Elekta VersaHD using the Varian Eclipse treatment planning system for photon beams : A single-institution experience. / Zhang, You; Le, Anh H.; Tian, Zhen; Iqbal, Zohaib; Chiu, Tsuicheng; Gu, Xuejun; Pugachev, Andrei; Reynolds Jr., Robert Ray; Park, Yang K.; Lin, Mu-Han; Stojadinovic, Strahinja.

In: Journal of Applied Clinical Medical Physics, 01.01.2019.

Research output: Contribution to journalArticle

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abstract = "The aim of this study was to report a single-institution experience and commissioning data for Elekta VersaHD linear accelerators (LINACs) for photon beams in the Eclipse treatment planning system (TPS). Two VersaHD LINACs equipped with 160-leaf collimators were commissioned. For each energy, the percent-depth-dose (PDD) curves, beam profiles, output factors, leaf transmission factors and dosimetric leaf gaps (DLGs) were acquired in accordance with the AAPM task group reports No. 45 and No. 106 and the vendor-supplied documents. The measured data were imported into Eclipse TPS to build a VersaHD beam model. The model was validated by creating treatment plans spanning over the full-spectrum of treatment sites and techniques used in our clinic. The quality assurance measurements were performed using MatriXX, ionization chamber, and radiochromic film. The DLG values were iteratively adjusted to optimize the agreement between planned and measured doses. Mobius, an independent LINAC logfile-based quality assurance tool, was also commissioned both for routine intensity-modulated radiation therapy (IMRT) QA and as a secondary check for the Eclipse VersaHD model. The Eclipse-generated VersaHD model was in excellent agreement with the measured PDD curves and beam profiles. The measured leaf transmission factors were less than 0.5{\%} for all energies. The model validation study yielded absolute point dose agreement between ionization chamber measurements and Eclipse within ±4{\%} for all cases. The comparison between Mobius and Eclipse, and between Mobius and ionization chamber measurements lead to absolute point dose agreement within ±5{\%}. The corresponding 3D dose distributions evaluated with 3{\%}global/2mm gamma criteria resulted in larger than 90{\%} passing rates for all plans. The Eclipse TPS can model VersaHD LINACs with clinically acceptable accuracy. The model validation study and comparisons with Mobius demonstrated that the modeling of VersaHD in Eclipse necessitates further improvement to provide dosimetric accuracy on par with Varian LINACs.",
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