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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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Characterization or Monolithic Scintillation Detectors Etched with Laser Induced Optical Barriers.

J V Panetta1, S Surti2, B Singh3

  • 1Department of Physics, University of Pennsylvania, Philadelphia, PA 19104 USA.

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|March 22, 2021
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Summary

Thick LYSO crystals for PET imaging were improved using laser-induced optical barriers (LIOBs). This technique enhanced spatial resolution in large scintillation detectors, crucial for whole-body PET systems.

Keywords:
Laser induced optical barriersmonolithic scintillators

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Area of Science:

  • Medical Physics
  • Nuclear Instrumentation
  • Materials Science

Background:

  • Scintillation detectors are vital for Positron Emission Tomography (PET) systems.
  • Optimizing crystal performance, particularly in thick scintillators for whole-body PET, remains an active research area.
  • Controlling light spread within scintillation crystals is key to improving detector resolution.

Purpose of the Study:

  • To investigate the performance of thick Lutetium Yttrium Oxyorthosilicate (LYSO) crystals for whole-body PET applications.
  • To evaluate the effectiveness of laser-induced optical barriers (LIOBs) in modifying light spread and improving detector performance.
  • To characterize the impact of varying laser etching parameters on LIOB properties and crystal response.

Main Methods:

  • Fabrication of thick LYSO crystals (up to 50x50x25 mm³) etched with LIOBs.
  • Characterization of LIOBs using small LYSO cubes and optical light.
  • Systematic variation of laser etching parameters to control LIOB opacity.
  • Evaluation of depth-dependent light response and spatial resolution using 511-keV gammas.

Main Results:

  • Demonstrated tunability of LIOB opacity by adjusting laser etching parameters.
  • Showed that LIOB opacity influences depth-dependent light response and spatial resolution.
  • Successfully etched large LYSO crystals with a fine grid of LIOBs.
  • Achieved an average spatial resolution of approximately 3 mm (Full Width at Half Maximum) for 511-keV gammas.

Conclusions:

  • Laser-induced optical barriers are an effective method for enhancing the performance of thick LYSO scintillation detectors.
  • The developed LIOB technique offers a promising approach for improving spatial resolution in whole-body PET systems.
  • Tunable optical barriers provide a novel means to optimize light collection and detector design in scintillation imaging.