PET装置用Zr添加GSO:Ce単結晶
PET装置用Zr添加GSO:Ce単結晶
PET装置用Zr添加GSO:Ce単結晶
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U.D.C. 616.07:621.397:681.3.02:546.655:548.55:546.831<br />
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Zr doped GSO:Ce Single Crystal for Positron Emission Tomography<br />
Mitsushi Kamada Naoaki Shimura Kazuhiro Yoshida<br />
Nachimuthu Senguttuvan Shigenori Shimizu<br />
PETPositron Emission Tomography<br />
1998<br />
2002CeGd2SiO5<br />
GSO:CePET<br />
PET<br />
<br />
GSO:Ce<br />
GSO:Ce<br />
Ce 4+ <br />
Zr<br />
ZrGSO:Ce<br />
20%Zr<br />
GSO:Ce<br />
The market of positron emission tomography(PET) equipment for medical imaging is<br />
rapidly expanding with the public health insurance coverage of the PET diagnosis in<br />
USA(1998) and Japan(2003). The Cerium-doped Gd2SiO5 (GSO:Ce) single crystal<br />
produced by Hitachi Chemical is used as a scintillator for detecting rays in the PET.<br />
In order to reduce inspection time and improve image quality in PET diagnosis, the<br />
makers of PET equipment are demanding continuous improvement in the scintillation<br />
performance. The GSO:Ce is especially desired to hold its excellent scintillation light<br />
output even when used in longer size required for improving the efficiency of rays<br />
detection. Therefore, we attempted to grow co-doped GSO single crystals with<br />
additional elements and evaluated their scintillation performance. As a result, we found<br />
that Zr doping is effective in preventing the coloration caused by Ce 4+ . By optimizing the<br />
concentration of Zr at 200 ppm, we have developed a new co-doped GSO:Ce single<br />
crystal with about 20% higher light output and better energy resolution than the<br />
conventional GSO:Ce.<br />
<br />
FDG 18 FPET<br />
Positron Emission Tomography1998<br />
PET<br />
2004400<br />
XCT-ray Computed Tomography<br />
CT-PETPET<br />
<br />
2002<br />
200480<br />
PET<br />
PET<br />
<br />
PET2<br />
511 keV<br />
<br />
PET<br />
<br />
PMT<br />
<br />
<br />
<br />
PET<br />
<br />
1 <br />
PhilipsPETAllegroCT-PETGemini<br />
GSO:Ce<br />
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PETEminence-GGSO:Ce<br />
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13
GSO:Ce<br />
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2, 3 GSO:Ce<br />
Ce<br />
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4 <br />
Ce<br />
<br />
GSO:Ce<br />
Zr<br />
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ZrGSO:Ce<br />
<br />
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GSO:Ce<br />
Gd2O3SiO2Ce<br />
CeO2<br />
<br />
100<br />
ppmIr<br />
<br />
1,950<br />
<br />
Ce<br />
Ce 3+ <br />
Ce 4+ <br />
90120 mm12 mm/hr<br />
1030/min<br />
<br />
<br />
GSO:Ce 5 <br />
GSO:CeCe 3+ <br />
GSO:CeCe 3+ <br />
Ce 3+ 5d4fGSO:Ce<br />
Ce<br />
<br />
PETCe<br />
Ce<br />
Ce 4+ <br />
<br />
<br />
GSO:Ce<br />
<br />
<br />
GSO:Ce<br />
Ce 4+ <br />
6 <br />
GSO:Ce<br />
<br />
4620 mm<br />
<br />
3<br />
137 Cs662 keV<br />
46 mmPMT<br />
R71955PTFE<br />
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100 ppm<br />
GSO:CeZrHfGe<br />
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GSO:Ce<br />
Zr<br />
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Zr<br />
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GSO:Ce<br />
Zr<br />
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Zr<br />
Zr50100200300500<br />
1,000 ppmGSO:Ce<br />
<br />
ZrGSO:Ce<br />
<br />
Zr200<br />
ppmGSO:Ce<br />
GSO:Ce20%<br />
Zr200 ppm<br />
<br />
ZrGSO:Ce<br />
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15
ZrGSO:CeZr<br />
200 ppm<br />
<br />
ZrHfGe<br />
<br />
GSO:Ce4<br />
4<br />
Zr<br />
GSO:Ce<br />
Ce 4+ <br />
Zr 4+ Gd 3+ <br />
Gd 3+ Zr 4+ 1<br />
Ce 4+ <br />
Ce 3+ Ce 4+ <br />
<br />
ZrGSO:Ce<br />
ZrGSO:Ce<br />
GSO:Ce<br />
Ce1.0 mol%2525100 mm<br />
2525 mm2100 mm<br />
Ce<br />
430 nmZr<br />
GSO:Ce 4 <br />
Ce 4+ Zr<br />
<br />
<br />
<br />
GSO:Ce<br />
20%ZrGSO:Ce<br />
ZrGSO:Ce<br />
PET<br />
PET<br />
<br />
<br />
GSO:Ce<br />
Ce 4+ <br />
<br />
GSO:Ce20%<br />
ZrGSO:Ce<br />
PET<br />
<br />
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1 RADIOISOTOPES53, 179 2004<br />
2 K. Takagi and T. FukazawaAppl. Phys. Lett.42, 46 1983<br />
3 40, 252003-1<br />
4 H. Ishibashi et al.IEEE Trans. Nucl. Sci.45 3, 518 1998<br />
5 28, 251997-1<br />
6 S. Shimizu et al.IEEE Trans. Nucl. Sci.50 4, 778 2003<br />
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