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Updated: May 14, 2026
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Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
Published on: May 10, 2021
Continuous depth-of-interaction measurement in a single-layer pixelated crystal array using a single-ended readout.
Mikiko Ito1, Min Sun Lee, Jae Sung Lee
1Department of Nuclear Medicine, Seoul National University, Seoul 110-744, Korea.
Physics in Medicine and Biology
|February 7, 2013
Summary
This study introduces a cost-effective depth-of-interaction (DOI) method for high-resolution positron emission tomography (PET) detectors. The novel technique achieves continuous DOI information using a single-layer crystal array, enhancing PET imaging capabilities.
Area of Science:
- Medical Imaging
- Nuclear Physics
- Detector Technology
Background:
- High-resolution Positron Emission Tomography (PET) imaging is crucial for medical diagnostics.
- Current PET systems face challenges in achieving high resolution and cost-effectiveness simultaneously.
- Accurate depth-of-interaction (DOI) measurement is essential for improving PET image quality by reducing parallax errors.
Purpose of the Study:
- To develop and evaluate a novel, cost-effective method for extracting continuous depth-of-interaction (DOI) information.
- To enable high-resolution PET imaging using a single-layer scintillation crystal array with single-ended readout.
- To assess the performance of the proposed DOI-encoding method in terms of spatial, energy, and timing resolutions.
Main Methods:
- Proposed a DOI-encoding method utilizing light dispersion patterns within a single-layer scintillation crystal array.
- Employed a 22x22 array of unpolished LGSO crystals (2.0x2.0x20 mm³) with reflectors to tailor light dispersion.
- Utilized a 64-anode multi-anode photomultiplier tube for readout and an analogue gain compensation circuit for anode non-uniformity.
- Determined DOI from normalized anode signal distributions and analyzed energy and time resolutions.
Main Results:
- Achieved an average DOI resolution (FWHM) of 4.2 mm across all crystals and depths.
- Obtained an average energy resolution of 11.3% ± 0.79% over a 2-18 mm DOI range.
- Reported average time resolutions (FWHM) between 320-356 ps.
- Demonstrated uniform energy, time, and DOI resolutions across the array, except at the edges.
Conclusions:
- The proposed DOI-encoding method enables continuous DOI information extraction from a cost-effective single-layer PET detector.
- The detector module exhibits promising performance metrics for high-resolution and high-sensitivity PET applications.
- This technology has the potential to advance PET imaging by providing a more affordable and capable solution.
