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Hybrid Cerenkov-scintillation detector validation using Monte Carlo simulations.

Emilie Jean1,2,3, Simon Lambert-Girard4, François Therriault-Proulx4

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Monte Carlo simulations validated a novel hybrid detector for irradiation angle measurements. Discrepancies arose from calculation method and calibration curve limitations, crucial for clinical use.

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Area of Science:

  • Medical Physics
  • Radiation Detection
  • Monte Carlo Simulation

Background:

  • Accurate measurement of irradiation angles is critical for radiotherapy.
  • Hybrid Cerenkov-scintillation detectors offer a novel approach for such measurements.
  • Understanding detector limitations is essential for clinical implementation.

Purpose of the Study:

  • To investigate the limitations of a novel hybrid Cerenkov-scintillation detector.
  • To evaluate the accuracy of its associated irradiation angle measurement method.
  • To analyze the impact of electron energy spectra on detector performance.

Main Methods:

  • Monte Carlo simulations were employed to replicate experimental irradiations.
  • Cerenkov angular calibration curves were compared with irradiation angle measurements.
  • The energy dependency of Cerenkov light was analyzed using electron energy spectra.

Main Results:

  • Monte Carlo simulations showed good agreement with experimental data.
  • The irradiation angle absolute mean error was below experimental values, max 1.12° for 9 MeV beam.
  • Discrepancies were primarily attributed to calculation method and calibration curve limitations, not solely scattered electrons.

Conclusions:

  • The study precisely identified limitations of the hybrid detector and angle calculation method.
  • Simulation results support hypotheses regarding Cerenkov dependencies and experimental observations.
  • Knowledge of these limitations is vital for the clinical application of the detector.