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Scanning laser optical computed tomography system for large volume 3D dosimetry.

Kurtis H Dekker1, Jerry J Battista1,2, Kevin J Jordan1,2

  • 1Department of Medical Biophysics, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, Ontario N6A 5C1, Canada.

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This study introduces an optical computed tomography (CT) system designed to minimize stray light artifacts, improving radiation dosimetry accuracy for large dosimeters. The new system offers high precision and speed for radiotherapy applications.

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Area of Science:

  • Medical Physics
  • Optical Imaging
  • Radiation Dosimetry

Background:

  • Stray light in optical computed tomography (CT) introduces artifacts, compromising radiation dosimetry accuracy in gels and solids.
  • Large dosimeter volumes, essential for verifying modern radiotherapy, amplify scatter effects, further challenging accurate measurements.

Purpose of the Study:

  • To design and characterize an optical CT system capable of high-accuracy primary transmission measurements.
  • To achieve effective stray light rejection while maintaining practical scan speeds for clinical applications.
  • To enable accurate dosimetry for large volume dosimeters used in radiotherapy dose verification.

Main Methods:

  • Developed an optical imaging platform utilizing a galvanometer mirror for horizontal scanning and a translation stage for vertical movement.
  • Implemented a laser beam and small area detector to minimize stray light production and acceptance.
  • Employed a custom lens-shaped optical CT aquarium for parallel ray sampling of projections.

Main Results:

  • The scanner images 15 cm diameter, 12 cm height volumes at 0.33 mm resolution in approximately 30 minutes.
  • Reconstructed attenuation coefficients agreed within 2% with independent cuvette measurements for various solutions and phantoms.
  • Demonstrated excellent linearity for transmissions between 90% and 2%, indicating high measurement fidelity.

Conclusions:

  • The developed optical CT system effectively rejects stray light, enhancing measurement accuracy.
  • The system provides accurate dosimetry for large volume dosimeters within a clinically relevant timeframe.
  • This technology holds promise for improving radiotherapy dose verification procedures.