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Related Experiment Video

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Monte Carlo simulation of linac using PRIMO.

Yang Li1, Xingru Sun1, Ying Liang1

  • 1Department of Radiation Oncology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital & Shenzhen Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Shenzhen, 518116, China.

Radiation Oncology (London, England)
|November 17, 2022
PubMed
Summary

Monte Carlo simulation using PRIMO accurately models radiotherapy dose calculations. The software demonstrated excellent agreement with measurements for percentage depth dose and off-axis ratio, confirming its reliability.

Keywords:
Dose leaf gapMonte CarloOff axis ratioPercentage depth doseTransmission factor

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Area of Science:

  • Medical Physics
  • Radiotherapy
  • Computational Dosimetry

Background:

  • Monte Carlo simulation is the gold standard for accurate dose calculation in radiotherapy.
  • PRIMO offers a user-friendly graphical interface for Monte Carlo simulations.

Purpose of the Study:

  • To validate the accuracy of the PRIMO Monte Carlo program for simulating a VitalBeam linear accelerator.
  • To assess the agreement between PRIMO simulations and experimental measurements for key dosimetric parameters.

Main Methods:

  • Simulated a VitalBeam linac (6MV and 6MV FFF) using PRIMO, adjusting parameters to match measurements.
  • Evaluated percentage depth dose (PDD) and off-axis ratio (OAR) using gamma passing rates.
  • Measured dose leaf gap (DLG) with an electronic portal imaging device and compared with simulated values.

Main Results:

  • High gamma passing rates (GPRs) achieved for PDD and OAR, indicating excellent agreement with measurements.
  • Simulated DLG and transmission factors closely matched experimental data for both 6MV and 6MV FFF beams.
  • PRIMO demonstrated high accuracy across various dosimetric evaluations.

Conclusions:

  • PRIMO is a validated and accurate independent Monte Carlo tool for radiotherapy dose calculations.
  • The simulation results align well with experimental measurements, supporting its clinical applicability.
  • PRIMO provides reliable dose calculations, independent of analytical algorithms.