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Wang L, Xing L, Sawkey D, et al. SU-E-T-499: Validation of the Varian Generic Phase Space Files for Monte Carlo Calculations of Dose Distributions for the TrueBeam Linac Head. Med Phys. 2012;39(6):3820doi: 10.1118/1.4735588.
Wang, L., Xing, L., Sawkey, D., Constantin, M., Svatos, M., & Mok, E. (2012). SU-E-T-499: Validation of the Varian Generic Phase Space Files for Monte Carlo Calculations of Dose Distributions for the TrueBeam Linac Head. Medical physics, 39(6), 3820. https://doi.org/10.1118/1.4735588
Wang, L, et al. "SU-E-T-499: Validation of the Varian Generic Phase Space Files for Monte Carlo Calculations of Dose Distributions for the TrueBeam Linac Head." Medical physics vol. 39,6 (2012): 3820. doi: https://doi.org/10.1118/1.4735588
Wang L, Xing L, Sawkey D, Constantin M, Svatos M, Mok E. SU-E-T-499: Validation of the Varian Generic Phase Space Files for Monte Carlo Calculations of Dose Distributions for the TrueBeam Linac Head. Med Phys. 2012 Jun;39(6):3820. doi: 10.1118/1.4735588. PMID: 28517461.
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Med Phys. 2012 Jun;39(6):3820. doi: 10.1118/1.4735588.

SU-E-T-499: Validation of the Varian Generic Phase Space Files for Monte Carlo Calculations of Dose Distributions for the TrueBeam Linac Head.

Medical physics

L Wang, L Xing, D Sawkey, M Constantin, M Svatos, E Mok

Affiliations

  1. Stanford University School of Medicine, Stanford, CA.
  2. Varian Medical Systems, Palo Alto, CA.

PMID: 28517461 DOI: 10.1118/1.4735588

Abstract

PURPOSE: To validate the generic phase space files for Varian TrueBeam linac head simulations.

METHODS: The generic phase space files include the simulation results of 6MV, 10MV, 6MV FFF, and 10MV FFF (flattening-filter free) operating modes of TrueBeam for patient-independent linac head components. Using the generic phase space files as the radiation sources, the BEAMnrc Monte Carlo codes are used to simulate the patient-dependent parts of the TrueBeam linac and the resulting phase space files are generated at a plane just before entering a water phantom for 4 different field sizes (5×5, 10×10, 20×20, and 40×40 cm

RESULTS: The matching of the calculated dose distributions to the measured ones is analyzed by the gamma index method with a criterion of 2% dose tolerance and 2 mm distance-to-agreement. Of the 64 comparisons, the minimum gamma index passing rate is at least 92%, after taking into account the statistical nature of the Monte Carlo calculated dose values. Despite the existence of latent variance of phase space files, the phantom dose calculation uncertainty can be less than 1% for field sizes as small as 5×5 cm

CONCLUSIONS: The Varian generic phase space files are accurate and efficient radiation sources for Monte Carlo calculations of radiation dose distributions for TrueBeam linac head. This work was supported in part by Varian Medical Systems and the NIH (1R01 CA104205 and 1R21 CA153587).

© 2012 American Association of Physicists in Medicine.

Keywords: Dosimetry; Field size; Linear accelerators; Monte Carlo methods; Radiotherapy sources

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