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Light-scattering-induced artifacts in a complex polymer gel dosimetry phantom.

Stephen G Bosi1, Pourandokht Naseri, Clive Baldock

  • 1Department of Radiation Oncology, Prince of Wales Hospital, Randwick NSW 2031, Australia. s.bosi@physics.usyd.edu.au

Applied Optics
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Polymer gels used in radiotherapy dosimetry can show artifacts when read with optical CT. A new model explains these artifacts, which are caused by scattered light, preventing inaccurate dose readings.

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Area of Science:

  • Medical physics
  • Radiotherapy
  • Polymer science

Background:

  • Polymer gels are used in medical dosimetry for 3D dose mapping in radiotherapy.
  • Optical computed tomography (CT) is employed to read these dose maps.
  • Artifacts in dose readings can lead to inaccurate radiotherapy treatments.

Purpose of the Study:

  • To investigate the optical properties of polymer gel dosimeters using optical CT.
  • To analyze artifacts in dose maps generated from a complex-shaped phantom.
  • To develop a model explaining the observed artifacts.

Main Methods:

  • Development of a complex-shaped test phantom (layered tube).
  • Reading the phantom using optical computed tomography (CT).
  • Analysis of extinction coefficient profiles and artifact identification.

Main Results:

  • Tomographic reconstruction revealed several artifacts in the extinction coefficient profiles.
  • A simple model successfully accounted for all observed artifacts.
  • Scattered light within the polymer gel was identified as the cause of artifacts.

Conclusions:

  • Scattered light in polymer gel dosimeters can cause artifacts during optical CT reading.
  • These artifacts may be misinterpreted, leading to incorrect dose assessments in radiotherapy.
  • The developed model helps in understanding and potentially mitigating these dosimetry artifacts.