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Light Spread Manipulation in Scintillators Using Laser Induced Optical Barriers.

Lisa Bläckberg1, Michael Moebius2, Georges El Fakhri3

  • 1Dept. of Radiolgy at Massachusetts General Hospital and Harvard Medical School, Boston, USA, and Dept. of Physics and Astronomy, Uppsala University, Sweden (LBlackberg@MGH.Harvard.edu).

IEEE Transactions on Nuclear Science
|March 26, 2019
PubMed
Summary

The Laser Induced Optical Barriers (LIOB) technique creates advanced scintillator detectors. New barrier patterns reduce edge effects in PET imaging detectors, improving performance.

Keywords:
Depth of interaction (DOI)LYSO:CeLaser Induced Optical BarriersPETdetector fabricationhigh-resolutionlight transport simulations

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Area of Science:

  • Nuclear Instrumentation and Detectors
  • Medical Imaging Physics

Background:

  • Current scintillator detectors for PET imaging have limitations in transversal and depth of interaction (DOI) resolution.
  • Existing detector types, mechanically pixelated arrays and monolithic crystals, exhibit edge effect issues.
  • The Laser Induced Optical Barriers (LIOB) technique offers potential for improved detector performance.

Purpose of the Study:

  • To investigate alternative optical barrier patterns using the LIOB technique to mitigate edge effects in scintillator detectors.
  • To evaluate the trade-offs between edge effect reduction and DOI resolution.
  • To demonstrate the feasibility of fabricating such detectors with controlled light channeling.

Main Methods:

  • Utilized the Laser Induced Optical Barriers (LIOB) technique to create optical barriers with lower refractive indices within LYSO:Ce crystals.
  • Performed light transport simulations to assess various barrier patterns, including deeper walls towards the detector edge.
  • Fabricated and characterized a 20 mm thick LYSO:Ce detector with pixel-like optical barrier structures.

Main Results:

  • Simulations indicate that deeper barrier walls extending towards the detector edge show promise in reducing edge effects.
  • A trade-off exists between edge effect reduction and the achievable DOI information.
  • Fabricated detectors demonstrated light channeling consistent with optical barriers having refractive indices between 1.2 and 1.4.

Conclusions:

  • The LIOB technique provides a flexible approach to designing scintillator detectors with improved performance characteristics.
  • Novel barrier patterns can effectively address edge effect issues, crucial for high-resolution PET imaging.
  • Laser-processed optical barriers enable controlled light transport in scintillator detectors.