Details

Autor(en) / Beteiligte

• Inadama, N.
• Murayama, H.
• Omura, T.
• Yamashita, T.
• Yamamoto, S.
• Ishibashi, H.
• Kawai, H.
• Omi, K.
• Umehara, T.
• Kasahara, T.

Titel

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

Ist Teil von

• 2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310), 2001, Vol.2, p.1099-1103 vol.2

Ort / Verlag

IEEE

Erscheinungsjahr

2001

Quelle

IEEE Electronic Library Online

Beschreibungen/Notizen

• 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 Gd/sub 2/SiO/sub 5/:Ce (GSO) crystals doped with different amount 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 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 mol% or 1.5 mol% GSO crystal elements are expressed. To evaluate this method, we constructed the 4-stage DOI detector by alternately stacking 1.5 mol% GSO crystal stages and 0.5 mol% stages. The result of /sup 137/Cs gamma ray beam scanning measurement proved that the DOI detector had enough accuracy in crystal identification.