A depth of interaction detector for PET with GSO crystals doped with different amount 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 conferencePaperpeer-review

2 Citations (Scopus)


A new method for a 4-stage depth of interaction (DOI) detector was proposed. The 4-stage DOI detector is constructed with two kinds of Gd2SiO5:Ce (GSO) crystals doped with different amount Ce, 0.5mol% and 1.5mol%. The amount of Ce in GSO determines the scintillation decay time constant and it is 60ns for the 0.5mol% GSO and 35ns for 1.5mol% GSO. This difference led to introduce pulse shape discrimination, which would distinguish between two kinds 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 2-dimensional histograms are obtained. The crystal of interaction can be identified on these histograms in which only 0.5% or 1.5mol% GSO crystal elements are expressed. To evaluate this method, we constructed the 4-stage DOI detector by alternately stacking 1.5mol% GSO crystal stages and 0.5mol% stages. The result of 137Cs gamma ray beam scanning measurement proved that the DOI detector had enough accuracy in crystal identification.

Original languageEnglish
Number of pages5
Publication statusPublished - 2001
Externally publishedYes
Event2001 IEEE Nuclear Science Symposium Conference Record - San Diege, CA, United States
Duration: 2001 Nov 42001 Nov 10


Conference2001 IEEE Nuclear Science Symposium Conference Record
Country/TerritoryUnited States
CitySan Diege, CA

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Radiology Nuclear Medicine and imaging


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