TY - GEN
T1 - Low-cost high-resolution 3rd generation PMT-Quadrant-Sharing (PQS) BGO block detectors for human and animal PET
AU - Liu, Shitao
AU - Liu, Jiguo
AU - Zhang, Yuxuan
AU - Li, Hongdi
AU - Ramirez, Rocio A.
AU - Wang, Yu
AU - Baghaei, Hossain
AU - Wong, Wai Hoi
PY - 2007
Y1 - 2007
N2 - The objectives of this work were to investigate the light transport process of Photomultiplier-Quadrant-Sharing (PQS) detector block. The light transport process decides the signal shape and affects detector decoding and timing of detector blocks. We used DETECT2000, a Monte Carlo simulation program of the optical transport process, to study a 52mm 13×13 crystal array size detector block. The crystal was 3.92×3.92×20mm3 size LSO crystal. Crystals was set to GROUND type surface and 1.8 refraction index. The reflector masks between crystals were set to 0.08mm thickness, POLISH type surface and 97% reflection rate. The block was coupled to four 51mm diameter PMT by PQS design. PMT window and optical grease refraction indexes were set to 1.5 and surfaces were set to transparent POLISH type. The PMT photocathode size was set to 47mm diameter. Both the position and time distribution of the optical photons were got from the simulation. The optical photons were localized on photomultiplier (PMT) photocathode. In the position distribution of detected photons, the half maximum counts region were 17mm2 on block corner and 362mm2 on block center; the tenth maximum counts region were 64mm2 on block corner and 1485mm2 on the center. The region size changed according to reflectors on crystal side. The time spectrum of optical photons showed the rising time were 0.09-0.16ns. The 95% light collection time were 1.14-1.96ns.
AB - The objectives of this work were to investigate the light transport process of Photomultiplier-Quadrant-Sharing (PQS) detector block. The light transport process decides the signal shape and affects detector decoding and timing of detector blocks. We used DETECT2000, a Monte Carlo simulation program of the optical transport process, to study a 52mm 13×13 crystal array size detector block. The crystal was 3.92×3.92×20mm3 size LSO crystal. Crystals was set to GROUND type surface and 1.8 refraction index. The reflector masks between crystals were set to 0.08mm thickness, POLISH type surface and 97% reflection rate. The block was coupled to four 51mm diameter PMT by PQS design. PMT window and optical grease refraction indexes were set to 1.5 and surfaces were set to transparent POLISH type. The PMT photocathode size was set to 47mm diameter. Both the position and time distribution of the optical photons were got from the simulation. The optical photons were localized on photomultiplier (PMT) photocathode. In the position distribution of detected photons, the half maximum counts region were 17mm2 on block corner and 362mm2 on block center; the tenth maximum counts region were 64mm2 on block corner and 1485mm2 on the center. The region size changed according to reflectors on crystal side. The time spectrum of optical photons showed the rising time were 0.09-0.16ns. The 95% light collection time were 1.14-1.96ns.
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U2 - 10.1109/NSSMIC.2007.4437052
DO - 10.1109/NSSMIC.2007.4437052
M3 - Conference contribution
AN - SCOPUS:48149096214
SN - 1424409233
SN - 9781424409235
T3 - IEEE Nuclear Science Symposium Conference Record
SP - 4233
EP - 4236
BT - 2007 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS-MIC
T2 - 2007 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS-MIC
Y2 - 27 October 2007 through 3 November 2007
ER -