Characterization of highly pixelated CZT detectors for sub-millimeter PET imaging

Yongzhi Yin, Sergey Komarov, Heyu Wu, Tae Yong Song, Qiang Li, Alfred Garson, Kuen Lee, Garry Simburger, Paul Dowkontt, Henric Krawczynski, Yuan Chuan Tai

Research output: Chapter in Book/Report/Conference proceedingConference contribution

15 Scopus citations

Abstract

Cadmium Zinc Telluride (CZT) detectors with 600 μm pitches and 350 μm pitches in 5mm thickness were developed and tested for investigation pixilated CZT detector applications in Positron Emission Tomography. In addition to flood γ-ray source measurements (662keV, 122keV and 59.5keV), we scan across pixels with a collimated Co-57 source (collimated beam size < pixel size) with a step size 50 μm. We sorted events based on the number of pixels that detect a charge signal (single, double, triple) and analyzed the charge sharing at different energies for detectors of different pitches. Results show the number of charge sharing events increases when γ-ray energy increases or when pixel size decreases. Based on the collimated beam measurements of energy at 122keV, the charge sharing range in a 5mm thick CZT detector biased at -1000V was estimated to be around 125μm FWHM for both 600μm and 350μm pitched anodes, while the charge loss is more severe in 350μm pitched detectors than in 600μm pitched detectors.

Original languageEnglish
Title of host publication2009 IEEE Nuclear Science Symposium Conference Record, NSS/MIC 2009
Pages2411-2414
Number of pages4
DOIs
StatePublished - Dec 1 2009
Event2009 IEEE Nuclear Science Symposium Conference Record, NSS/MIC 2009 - Orlando, FL, United States
Duration: Oct 25 2009Oct 31 2009

Publication series

NameIEEE Nuclear Science Symposium Conference Record
ISSN (Print)1095-7863

Conference

Conference2009 IEEE Nuclear Science Symposium Conference Record, NSS/MIC 2009
CountryUnited States
CityOrlando, FL
Period10/25/0910/31/09

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    Yin, Y., Komarov, S., Wu, H., Song, T. Y., Li, Q., Garson, A., Lee, K., Simburger, G., Dowkontt, P., Krawczynski, H., & Tai, Y. C. (2009). Characterization of highly pixelated CZT detectors for sub-millimeter PET imaging. In 2009 IEEE Nuclear Science Symposium Conference Record, NSS/MIC 2009 (pp. 2411-2414). [5402160] (IEEE Nuclear Science Symposium Conference Record). https://doi.org/10.1109/NSSMIC.2009.5402160