A depth of interaction detector for PET with GSO crystals doped with different amounts of Ce

Naoko Inadama*, Hideo Murayama, Tomohide Omura, Takaji Yamashita, Seiichi Yamamoto, Hiroyuki Ishibashi, Hideyuki Kawai, Kenji Omi, Takaya Umehara, Takehiro Kasahara

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

56 Citations (Scopus)


A new method for a four-stage depth of interaction (DOI) detector is proposed. The four-stage DOI detector is constructed with two kinds of Gd2SiO5:Ce (GSO) crystals doped with different amounts of Ce, 0.5 mol% and 1.5 mol%. The amount of Ce in GSO determines the scintillation decay time constant, and it is 60 ns for the 0.5 mol% GSO and 35 ns for 1.5 mol% GSO. This difference led to the introduction of pulse-shape discrimination, which would distinguish between two kinds of event data from respective GSOs and sort them into two groups. By independently applying Anger-type position arithmetic to the data of each group, two two-dimensional (2-D) histograms are obtained. The crystal of interaction can be identified on these histograms in which only 0.5 mol% or 1.5 mol% GSO crystal elements are expressed. To evaluate this method, we constructed the four-stage DOI detector by alternately stacking 1.5 mol% GSO crystal stages and 0.5 mol% stages. The result of a scanning measurement with a 137Cs gamma-ray beam proved that the DOI detector had enough accuracy in crystal identification.

Original languageEnglish
Pages (from-to)629-633
Number of pages5
JournalIEEE Transactions on Nuclear Science
Volume49 I
Issue number3
Publication statusPublished - 2002 Jun
Externally publishedYes


  • Depth of interaction
  • Gadolinium orthosilicate
  • Positron emission tomography (PET)
  • Pulse-shape discrimination

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering


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