TY - JOUR
T1 - A depth of interaction detector for PET with GSO crystals doped with different amounts of Ce
AU - Inadama, Naoko
AU - Murayama, Hideo
AU - Omura, Tomohide
AU - Yamashita, Takaji
AU - Yamamoto, Seiichi
AU - Ishibashi, Hiroyuki
AU - Kawai, Hideyuki
AU - Omi, Kenji
AU - Umehara, Takaya
AU - Kasahara, Takehiro
N1 - Funding Information:
Manuscript received August 27, 2001. This work was supported in part by the Ministry of Education, Science and Culture of Japan under Grant-in-Aid 12470191.
PY - 2002/6
Y1 - 2002/6
N2 - 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.
AB - 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.
KW - Depth of interaction
KW - Gadolinium orthosilicate
KW - Positron emission tomography (PET)
KW - Pulse-shape discrimination
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U2 - 10.1109/TNS.2002.1039540
DO - 10.1109/TNS.2002.1039540
M3 - Article
AN - SCOPUS:0036624634
SN - 0018-9499
VL - 49 I
SP - 629
EP - 633
JO - IEEE Transactions on Nuclear Science
JF - IEEE Transactions on Nuclear Science
IS - 3
ER -