Evaluation of a position sensitive avalanche photodiode for PET

A gamma ray detector for PET, consisting of an array of mixed lutetium oxyorthosilicate (MLS) scintillator crystals coupled to a position sensitive avalanche photodiode (PSAPD), was evaluated. The scintillator array was constructed from individual MLS crystals with dimensions of 1.5 mm /spl times/ 1...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 2003-08, Vol.50 (4), p.792-796
Main Authors: Burr, K.C., Ivan, A., LeBlanc, J., Zelakiewicz, S., McDaniel, D.L., Kim, C.L., Ganin, A., Shah, K.S., Grazioso, R., Farrell, R., Glodo, J.
Format: Article
Language:English
Subjects:
Arrays
Assembly
Avalanche photodiodes
Avalanches
Channels
Crystalline materials
Crystals
Energy resolution
Gamma ray detectors
Multilevel systems
Photodiodes
Position sensitive
Positron emission tomography
Sensor arrays
Time measurements
Timing
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Description
Summary:A gamma ray detector for PET, consisting of an array of mixed lutetium oxyorthosilicate (MLS) scintillator crystals coupled to a position sensitive avalanche photodiode (PSAPD), was evaluated. The scintillator array was constructed from individual MLS crystals with dimensions of 1.5 mm /spl times/ 1.5 mm /spl times/ 15 mm. The assembled 7 /spl times/ 7 array, including intercrystal reflector material, had a pitch of 1.79 mm. The low noise, high gain PSAPD had dimensions of 14 mm /spl times/ 14 mm. Peaks associated with each of the 49 scintillator crystals were readily identifiable in flood histograms, and most of the crystals demonstrated energy resolution in the range of 15% to 20% at 511 keV. Measurements of the timing of the PSAPD in coincidence with a fast-scintillator/PMT detector indicated a timing resolution of approximately 4 ns. The operating characteristics and design attributes, such as compactness and reduced readout channel requirements, of the PSAPD make it attractive for high resolution PET applications.
ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.2003.815317