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Positioning and energy response of PET block detectors with different light sharing schemes

Publication ,  Journal Article
Tornai, MP; Germano, G; Hoffman, EJ
Published in: IEEE Nuclear Science Symposium & Medical Imaging Conference
January 1, 1994

Two state-of-the-art modular PET block detectors using either discrete or pseudo-discrete BGO crystals coupled to two dual PMTs, utilizing different light sharing schemes, were evaluated. Both detectors were approximately 30 mm thick, while each element of the GE 6 × 6 block detector was 4 mm × 8.4 mm, and each element of the CTI 8 × 7 block detector was 2.8 mm × 5.8 mm. In addition to measurements with gamma sources, the detectors were also irradiated with a Sr/Y-90 beta source to evaluate the performance of the block detectors without inter-element scatter of annihilation photons. The best and worst energy resolutions of individual elements at 511 keV were 21.8% and 44.2% for the GE detector, and 22.7% and 42.5% for the CTI detector. The peak to valley ratios in the detector identification ratio histograms were generally better than 3 to 1. Measurements with beta sources indicate that light sharing in both detectors is a large component of event mispositioning along with inter-detector scatter of the annihilation photons.

Published In

IEEE Nuclear Science Symposium & Medical Imaging Conference

Publication Date

January 1, 1994

Issue

pt 2

Start / End Page

1126 / 1130
 

Citation

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Tornai, M. P., Germano, G., & Hoffman, E. J. (1994). Positioning and energy response of PET block detectors with different light sharing schemes. IEEE Nuclear Science Symposium & Medical Imaging Conference, (pt 2), 1126–1130.
Tornai, M. P., G. Germano, and E. J. Hoffman. “Positioning and energy response of PET block detectors with different light sharing schemes.” IEEE Nuclear Science Symposium & Medical Imaging Conference, no. pt 2 (January 1, 1994): 1126–30.
Tornai MP, Germano G, Hoffman EJ. Positioning and energy response of PET block detectors with different light sharing schemes. IEEE Nuclear Science Symposium & Medical Imaging Conference. 1994 Jan 1;(pt 2):1126–30.
Tornai, M. P., et al. “Positioning and energy response of PET block detectors with different light sharing schemes.” IEEE Nuclear Science Symposium & Medical Imaging Conference, no. pt 2, Jan. 1994, pp. 1126–30.
Tornai MP, Germano G, Hoffman EJ. Positioning and energy response of PET block detectors with different light sharing schemes. IEEE Nuclear Science Symposium & Medical Imaging Conference. 1994 Jan 1;(pt 2):1126–1130.

Published In

IEEE Nuclear Science Symposium & Medical Imaging Conference

Publication Date

January 1, 1994

Issue

pt 2

Start / End Page

1126 / 1130