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Related Experiment Video

Updated: Aug 13, 2025

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Development of a two-layer dense-pixel LYSO Compton camera prototype for prompt gamma imaging.

Zhiyang Yao1,2, Yongshun Xiao1,2, Minghao Dong1,2

  • 1Department of Engineering Physics, Tsinghua University, Beijing, 100084, People's Republic of China.

Physics in Medicine and Biology
|January 19, 2023
PubMed
Summary

A new two-layer Lutetium-Yttrium Orthosilicate (LYSO)-based Compton Camera (CC) prototype was developed for prompt gamma imaging. This dense-pixel LYSO CC achieves high resolution and detection efficiency, advancing nuclear medical imaging capabilities.

Keywords:
Compton imagingLYSO detectorprompt gamma imagingprototype evaluation

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Area of Science:

  • Nuclear medical imaging
  • Compton imaging technology
  • Radiation detection

Background:

  • Lutetium-Yttrium Orthosilicate (LYSO)-based Compton Cameras (CC) offer high detection efficiency and position resolution for prompt gamma imaging.
  • Few LYSO CC prototypes have been practically evaluated, highlighting a need for further development and testing.

Purpose of the Study:

  • To construct a lightweight, dense-pixel, silicon photomultiplier-based, two-layer LYSO CC prototype for prompt gamma imaging.
  • To evaluate the imaging performance and resolution metrics of the developed LYSO CC prototype.

Main Methods:

  • Utilized double-encoding with a thick light guide and a coding circuit for constructing 46 × 46 dense-pixel LYSO detectors.
  • Implemented pixel segmentation via centroid mapping for spectral calibration and developed a framework for list-mode projection data acquisition.
  • Conducted experiments using standard source calibration, a ring-like 22Na source, and a mixed point-like source to assess performance.

Main Results:

  • Achieved a lateral position resolution of 1 mm and depth resolution deviations of 2.5 mm (scatterer) and 5 mm (absorber).
  • Measured energy resolution of 9.63% @ 1.33 MeV (scatterer) and 10.8% @ 1.33 MeV (absorber).
  • Demonstrated a detection efficiency of 5.7 × 10^-3 @ 1.33 MeV for a spherical 60Co source and a reconstruction FWHM of 5.5 mm, distinguishing spatial offsets within 2 mm.

Conclusions:

  • The developed two-layer dense-pixel LYSO CC is a significant advancement for prompt gamma detection.
  • This prototype facilitates the integration of Compton imaging techniques into nuclear medical imaging for various energy sources.