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J Nucl Med. 2008; 49 (Supplement 1):411P
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Instrumentation & Data Analysis: Instrumentation

Instrumentation Posters

Performance characteristics of new high resolution L(Y)SO detector blocks for human PET

Rocio Ramirez1, Shitao Liu1, Yuxuan Zhang1, Hongdi Li1, Hossain Baghaei1, Jiguo Liu1 and Wai-Hoi Wong1

1 Experimental Diagnostic Imaging, University of Texas MD Anderson Cancer Center, Houston, Texas

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Objectives: To develop a high resolution lutetium detectors for low production human PET Scanners, using PMT quadrant sharing (PQS) decoding technology.

Methods: 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 14x14, 15x15, and, 16x16 for two of them. The crystal pitch sizes were 2.74x2.74x20mm3, 3.25x3.25x20mm3, 2.42x2.42x20mm3, 2.78x2.78x20mm3 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 39/51mm 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.

Results: 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.

Conclusions: 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.





This Article
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Right arrow Articles by Wong, W.-H.