TY - GEN
T1 - Performance characteristics of four new high resolution L(Y)so detector blocks for human pet
AU - Ramirez, Rocio A.
AU - Liu, Shitao
AU - Zhang, Yuxuan
AU - Li, Hongdi
AU - Baghaei, Hossain
AU - Liu, Jiguo
AU - Kim, Soonseok
AU - Wang, Yu
AU - Wong, Wai Hoi
PY - 2007
Y1 - 2007
N2 - Using standard circular photomultipliers in quadrant sharing configuration (PQS), four new high resolution L(Y)SO detector blocks for human PET applications have been developed. The detector blocks were assembled in very large arrays of 14×14, 15×15, and, 16×16 for two of them. The crystal pitch sizes were 2.74×2.74×20mm3, 3.25×3.25×20mm3, 2.42×2.42×20mm3, 2.78×2.78×20mm3 and the surface finishing was 4-μm. Mirror films patterns were placed between crystals as reflectors. The blocks were assembled using optical grease and wrapped by Teflon tape. To acquire list mode data of Ga-68 source (511 KeV) with at high voltage bias of 1100V, these blocks were coupled to regular round PMT's of 39/51 mm and, crystal decoding maps, individual crystal energy resolutions and relative light-collection efficiencies were extracted from this data. To investigate the potential imaging resolution of the human PET scanners with these blocks, GATE (Geant4 Application for Tomographic Emission) simulation package was used. The packing fractions of these blocks were found to be 97%, 97% and 95%-97%. From decoding maps, all 196, 225 and 256 crystals were clearly identified. The average energy resolutions were 14.3%, 15.5% and 13.1%/14.2%. The relative collection efficiencies were 0.81-1.00, 0.83-1.00 and, 0.77-1.00/0.78-1.00. From this study we can conclude that the PQS design has the potentiality to achieve high spatial resolution and excellent energy resolutions on human PET scanners with substantially lower production cost.
AB - Using standard circular photomultipliers in quadrant sharing configuration (PQS), four new high resolution L(Y)SO detector blocks for human PET applications have been developed. The detector blocks were assembled in very large arrays of 14×14, 15×15, and, 16×16 for two of them. The crystal pitch sizes were 2.74×2.74×20mm3, 3.25×3.25×20mm3, 2.42×2.42×20mm3, 2.78×2.78×20mm3 and the surface finishing was 4-μm. Mirror films patterns were placed between crystals as reflectors. The blocks were assembled using optical grease and wrapped by Teflon tape. To acquire list mode data of Ga-68 source (511 KeV) with at high voltage bias of 1100V, these blocks were coupled to regular round PMT's of 39/51 mm and, crystal decoding maps, individual crystal energy resolutions and relative light-collection efficiencies were extracted from this data. To investigate the potential imaging resolution of the human PET scanners with these blocks, GATE (Geant4 Application for Tomographic Emission) simulation package was used. The packing fractions of these blocks were found to be 97%, 97% and 95%-97%. From decoding maps, all 196, 225 and 256 crystals were clearly identified. The average energy resolutions were 14.3%, 15.5% and 13.1%/14.2%. The relative collection efficiencies were 0.81-1.00, 0.83-1.00 and, 0.77-1.00/0.78-1.00. From this study we can conclude that the PQS design has the potentiality to achieve high spatial resolution and excellent energy resolutions on human PET scanners with substantially lower production cost.
KW - Human PET detectors
KW - LSO
KW - LYSO
KW - PET
KW - PQS
KW - Photomultiplier-quadrant-sharing
UR - http://www.scopus.com/inward/record.url?scp=48349115769&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=48349115769&partnerID=8YFLogxK
U2 - 10.1109/NSSMIC.2007.4436840
DO - 10.1109/NSSMIC.2007.4436840
M3 - Conference contribution
AN - SCOPUS:48349115769
SN - 1424409233
SN - 9781424409235
T3 - IEEE Nuclear Science Symposium Conference Record
SP - 3305
EP - 3308
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 -