Basic performance of Mg co-doped new scintillator used for TOF-DOI-PET systems

Takahiro Kobayashi*, Seiichi Yamamoto, Satoshi Okumura, Jung Yeol Yeom, Kei Kamada, Akira Yoshikawa

*この研究の対応する著者

研究成果: Article査読

4 被引用数 (Scopus)

抄録

Phoswich depth-of-interaction (DOI) detectors utilizing multiple scintillators with different decay time are a useful device for developing a high spatial resolution, high sensitivity PET scanner. However, in order to apply pulse shape discrimination (PSD), there are not many combinations of scintillators for which phoswich technique can be implemented. Ce doped Gd3Ga3Al2O12 (GFAG) is a recently developed scintillator with a fast decay time. This scintillator is similar to Ce doped Gd3Al2Ga3O12 (GAGG), which is a promising scintillator for PET detector with high light yield. By stacking these scintillators, it may be possible to realize a high spatial resolution and high timing resolution phoswich DOI detector. Such phoswich DOI detector may be applied to time-of-flight (TOF) systems with high timing performance. Therefore, in this study, we tested the basic performance of the new scintillator –GFAG for use in a TOF phoswich detector. The measured decay time of a GFAG element of 2.9 mmx2.9 mmx10 mm in dimension, which was optically coupled to a photomultiplier tube (PMT), was faster (66 ns) than that of same sized GAGG (103 ns). The energy resolution of the GFAG element was 5.7% FWHM which was slightly worse than that of GAGG with 4.9% FWHM for 662 keV gamma photons without saturation correction. Then we assembled the GFAG and the GAGG crystals in the depth direction to form a 20 mm long phoswich element (GFAG/GAGG). By pulse shape analysis, the two types of scintillators were clearly resolved. Measured timing resolution of a pair of opposing GFAG/GAGG phoswich scintillator coupled to Silicon Photomultipliers (Si-PM) was good with coincidence resolving time of 466 ps FWHM. These results indicate that the GFAG combined with GAGG can be a candidate for TOF-DOI-PET systems.

本文言語English
ページ(範囲)14-19
ページ数6
ジャーナルNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
842
DOI
出版ステータスPublished - 2017 1月 11
外部発表はい

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学
  • 器械工学

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