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Commissioning and validation of the Elekta One GPUMCD algorithm for an Elekta VersaHD linear accelerator.

Samuel D Rusu1, Blake R Smith1, Grace H Hutchinson1

  • 1Department of Radiation Oncology, University of Iowa Hospitals and Clinics, Iowa City, Iowa, USA.

Journal of Applied Clinical Medical Physics
|March 20, 2026
PubMed
Summary

GPU-accelerated Monte Carlo Dose calculation engine (GPUMCD) was commissioned and validated for Elekta linacs. This advanced algorithm significantly reduces calculation time while maintaining high accuracy for clinical implementation.

Keywords:
Dose validationGPUMCDMonte Carlo

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Computational Dosimetry

Background:

  • Monte Carlo (MC) dose calculation is crucial for accurate radiation therapy planning.
  • GPU acceleration offers potential for faster MC computations.
  • Clinical implementation requires rigorous commissioning and validation.

Purpose of the Study:

  • To commission and validate the GPU-accelerated Monte Carlo Dose calculation engine (GPUMCD).
  • To assess GPUMCD's performance for c-arm Elekta linear accelerators (linacs).
  • To confirm clinical readiness of GPUMCD within the Elekta One Treatment Planning System.

Main Methods:

  • Generated a GPUMCD beam model for multiple photon energies on a VersaHD linac.
  • Compared calculated percent depth dose (PDD) and lateral profiles against measurements.
  • Verified point doses and 3D dose distributions in various phantoms using adapted MPPG 5.b methodology.

Main Results:

  • Achieved 98.4% agreement for PDDs and beam profiles within 2% dose difference for fields > 5x5 cm.
  • Attained 99.9% agreement using 2%DD/2mm DTA gamma criteria with a 5% dose threshold.
  • Reduced calculation time by 93% compared to XVMC, with heterogeneity and point dose agreement within 3%.

Conclusions:

  • GPUMCD has been successfully commissioned and validated for clinical use.
  • The algorithm is suitable for the VersaHD linac within the Elekta One Treatment Planning System.
  • GPUMCD offers a significant speed improvement for Monte Carlo dose calculations.