Commissioning and validation of a single photon beam model in RayStation for multiple matched Elekta Linacs

Lin Su, Ellen Huang, Devin A. Miles, Reza Farjam, Ian R. Marsh, Qiongge Li, Joseph A. Moore, Todd R. McNutt, Kai Ding, Ken Kang Hsin Wang, Adam Robinson, Gregory Kuri, Richard Seabrease, David P. Adam, Ryan Oglesby, Bin Shen, Binbin Wu, Junghoon Lee, Xun Jia, Sarah Han-Oh

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose: A single treatment planning system (TPS) model for matched linacs provides flexible clinical workflows from patient treatment to intensity-modulated radiation therapy (IMRT) quality assurance (QA) measurement. Since general guidelines for building a single TPS model and its validation for matched linacs are not well established, we present our RayStation photon TPS modeling strategy for matched Elekta VersaHD linacs. Method: The four linacs installed from 2013 to 2020 were matched in terms of Percent Depth Dose (PDD), profile, output factor and wedge factors for 6-MV, 10-MV, 15-MV, and 6-MV-FFF, and maintained following TG-142 recommendations until RayStation commissioning. The RayStation single model was built to represent all four linacs within the tolerance limits recommended by MPPG-5.a. The comprehensive validation tests were performed for one linac following MPPG-5.a and TG-119 guidelines, and spot checks for the other three. Our TPS modeling/validation method was evaluated by re-analyzing the previous 103 patient-specific IMRT/volumetric modulated arc therapy (VMAT) QA measurements with the calculated planar doses by the single model in comparison with the analysis results using four individual Pinnacle TPS models. Results: For all energies, our single model PDDs were within 1% agreement of the four-linac commissioning measurements. The MPPG-5.a validation tests from 5.1 through 7.5 and all TG-119 measurements passed within the recommended tolerance limits. The IMRT QA results (mean ± standard deviation) for RayStation single model versus Pinnacle individual models were 98.9% ± 1.3% and 98.0% ± 1.4% for 6-MV, 99.9% ± 0.1% and 99.1% ± 1.9% for 10-MV, and 98.2% ± 1.3% and 97.9% ± 1.8% for 6-MV-FFF, respectively. Conclusion: We successfully built and validated a single photon beam model in RayStation for four Elekta Linacs. The proposed new validation methods were proven to be both efficient and effective.

Original languageEnglish (US)
Article numbere14485
JournalJournal of applied clinical medical physics
Volume25
Issue number10
DOIs
StatePublished - Oct 2024

Keywords

  • RayStation
  • TPS modeling and validation
  • matched linacs
  • single beam model

ASJC Scopus subject areas

  • Radiation
  • Instrumentation
  • Radiology Nuclear Medicine and imaging

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