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Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies
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Optically Stimulated Luminescence Silicone Foils for 2D Dose Mapping in Proton Radiotherapy.

Michał Sądel1, Leszek Grzanka1, Jan Swakoń1

  • 1Institute of Nuclear Physics Polish Academy of Sciences, PL-31342 Krakow, Poland.

Materials (Basel, Switzerland)
|May 14, 2025
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Summary

A new reusable silicon foil dosimeter using optically stimulated luminescence (OSL) material offers accurate spatial proton dose mapping in radiotherapy. This novel dosimeter shows comparable accuracy to current standards, enabling precise 3D proton dose verification.

Keywords:
GafchromicTM EBT3 filmsMgB4O7:Ce,Lioptically stimulated luminescenceproton radiotherapytwo-dimensional radiation dosimetry

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Area of Science:

  • Medical Physics
  • Radiotherapy Dosimetry
  • Materials Science

Background:

  • Accurate spatial dose verification is crucial for modern radiotherapy, especially for proton therapy.
  • Current passive dosimetry methods like Gafchromic™ films have limitations in real-time 3D dose mapping.
  • Optically Stimulated Luminescence (OSL) materials offer potential for advanced dosimetric applications.

Purpose of the Study:

  • To develop and characterize a novel reusable silicon foil dosimeter based on MgB4O7:Ce,Li (MBO) OSL material.
  • To evaluate its capability for spatially resolved radiotherapy dose verification, particularly for proton beams.
  • To compare the performance of the MBO foil dosimeter with Gafchromic™ EBT3 films for 2D proton dose mapping.

Main Methods:

  • Development of a reusable silicon foil dosimeter utilizing the OSL material MgB4O7:Ce,Li (MBO).
  • Design of a specialized optical detection setup with LEDs and a CCD camera for 2D OSL acquisition.
  • Characterization of spatial resolution and comparison of proton dose profiles against Gafchromic™ EBT3 films.

Main Results:

  • The MBO foil dosimeter achieved high-resolution 2D proton dose mapping with sub-0.1 mm resolution.
  • Reconstructed 2D proton dose distributions showed accuracy comparable to Gafchromic™ EBT3 films.
  • Proton radial dose profiles agreed within 5% between MBO foils and EBT3 films, with similar image resolutions.

Conclusions:

  • The novel MBO-based silicon foil dosimeter is a promising reusable alternative for radiotherapy dose verification.
  • Its high spatial resolution and accuracy make it suitable for 2D and potential 3D proton dose mapping.
  • This technology can significantly contribute to the precise verification of advanced radiotherapy techniques like proton therapy.