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Accurate dose measurements using Cherenkov emission polarization imaging.

Émily Cloutier1,2, Louis Archambault1,2, Luc Beaulieu1,2

  • 1Centre Intégré de cancérologie and Axe Oncologie du CRCHU de Québec - Université Laval, CHU de Quebec - Universite Laval, Quebec, Canada.

Medical Physics
|May 3, 2022
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Summary

This study introduces a novel polarization imaging technique for precise in-water Cherenkov radiation dose measurements. The method corrects for anisotropy, significantly improving accuracy in radiation therapy dosimetry.

Keywords:
Cherenkovimagingluminescencepolarization

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Area of Science:

  • Medical Physics
  • Radiation Dosimetry
  • Optical Imaging

Background:

  • Cherenkov radiation offers potential for direct in-water dose measurements.
  • Current methods are limited by Cherenkov emission anisotropy, reducing precision.

Purpose of the Study:

  • To develop a high-accuracy Cherenkov emission dose measurement method using polarization imaging.
  • To overcome the limitations of anisotropy in Cherenkov radiation measurements.

Main Methods:

  • Cherenkov radiation in a water tank was imaged using a CCD camera with polarizers at four angles.
  • Malus' law was used to extract the polarized signal.
  • Monte Carlo simulations informed corrections for angular distributions, and results were compared to treatment planning system (TPS) calculations.

Main Results:

  • Polarization imaging reduced deviations at depth from 8% to ~1% for 6 and 18 MV photon beams.
  • Differences between corrected signals and TPS calculations were within 1-2% for beam profiles.
  • Cherenkov emission was confirmed to be partly polarized.

Conclusions:

  • A novel polarization imaging approach enables high-precision, water-based Cherenkov radiation dose measurements.
  • The method corrects Cherenkov emission anisotropy within 4% on the beam central axis and in depth.