Positioning And Energy Response Of Pet Block Detectors With Different Light Sharing Schemes

Published

Journal Article

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 x 6 block detector was 4 mm x 8.4 mm, and each element of the CTI 8 x 7 block detector was 2.8 mm x 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. © 1994 IEEE

Full Text

Duke Authors

Cited Authors

  • Tornai, MP; Hoffman, EJ; Germano, G

Published Date

  • January 1, 1994

Published In

Volume / Issue

  • 41 / 4

Start / End Page

  • 1458 - 1463

Electronic International Standard Serial Number (EISSN)

  • 1558-1578

International Standard Serial Number (ISSN)

  • 0018-9499

Digital Object Identifier (DOI)

  • 10.1109/23.322931

Citation Source

  • Scopus