High resolution GSO block detectors using PMT-Quadrant- Sharing design for small animal PET

Soonseok Kim, Wai Hoi Wong, Shuping Xie, Rocio Ramirez, Yaqiang Liu, Hongdi Li, Tao Xing, Yu Wang, Jorge Uribe, Hossain Baghaei, Yuxuan Zhang

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations

Abstract

GSO position-sensitive block detectors have been developed using the PMT-Quadrant Sharing (PQS) design for an animal PET system. Two prototype block detectors with dimensions of 1.51 mm × 1.51 mm × 10 mm (12×12 array) and 1.66 mm × 1.66 mm × 10 mm (11×11 array) were built using 19 mm round PMT and ESR mirror-film (98 % reflectance, 0.065 mm thickness, 3M Corporation) windows to control the distribution of scintillation light for the PQS design. The detector pitches are 1.59 and 1.74 mm and the crystal-packing fractions 90, 91 % (area), respectively. List-mode measurements were carried out to test the crystal decoding with Cs-137 sources and analyzed to extract the individual crystal spectra. All the crystals in both crystal-position decoding maps were clearly identified and well isolated. The light collection efficiency is lowest in the central crystals and highest in the crystals of the four corners, with a ratio of 0.76 for the 11×11 array. The overall energy resolution of the 11×11 array is 13.5 % (15.4 % at 511 keV) with a standard deviation of 1.2 %, which indicates that the energy resolution of the detector is very high and uniformly distributed. From this study, we achieved a high crystal/PMT ratio of 144:1. It is believed that these detectors would be useful for a high-resolution animal PET camera.

Original languageEnglish (US)
Pages (from-to)3385-3388
Number of pages4
JournalIEEE Nuclear Science Symposium Conference Record
Volume6
StatePublished - 2004
Event2004 Nuclear Science Symposium, Medical Imaging Conference, Symposium on Nuclear Power Systems and the 14th International Workshop on Room Temperature Semiconductor X- and Gamma- Ray Detectors - Rome, Italy
Duration: Oct 16 2004Oct 22 2004

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Radiology Nuclear Medicine and imaging

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