Study of inter-crystal scatter in small scintillator arrays designed for high resolution PET imaging

Yiping Shao, Simon R. Cherry, Stefan Siegel, Robert W. Silverman

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

1 Scopus citations

Abstract

Inter-crystal scatter causes mispositioning of scintillation events, which is of particular concern in imaging detectors based on small discrete scintillators. Because it is difficult to measure the scatter and its effects on detector intrinsic spatial resolution, a Monte Carlo simulation has been used to study this effect for evaluating and optimizing the design of a high resolution animal PET detector based on a small scintillator crystal array. In this simulation, we quantitatively assess the mispositioning of events due to inter-crystal scatter as a function of parameters such as different scintillator materials, crystal geometry, γ ray incident angle and energy threshold applied, etc. In analyzing the tradeoff between the detector efficiency and the position detection accuracy, we found that the mispositioning is not sensitive to the energy threshold, however it does change rapidly with the crystal length and the gap between crystals. We also evaluated different crystal positioning schemes to provide a theoretical estimation for the choice of the best scheme. To study how the inter-crystal scatter affects detector spatial resolution, we analyze the coincidence line spread function with and without the scatter, and found that the inter-crystal scatter has very little effect on the FWHM and FWTM of the coincidence line spread function.

Original languageEnglish (US)
Title of host publicationIEEE Nuclear Science Symposium & Medical Imaging Conference
PublisherIEEE
Pages1006-1010
Number of pages5
Volume2
StatePublished - Dec 1 1995
EventProceedings of the 1995 IEEE Nuclear Science Symposium and Medical Imaging Conference. Part 1 (of 3) - San Francisco, CA, USA
Duration: Oct 21 1995Oct 28 1995

Other

OtherProceedings of the 1995 IEEE Nuclear Science Symposium and Medical Imaging Conference. Part 1 (of 3)
CitySan Francisco, CA, USA
Period10/21/9510/28/95

ASJC Scopus subject areas

  • Engineering(all)

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    Shao, Y., Cherry, S. R., Siegel, S., & Silverman, R. W. (1995). Study of inter-crystal scatter in small scintillator arrays designed for high resolution PET imaging. In IEEE Nuclear Science Symposium & Medical Imaging Conference (Vol. 2, pp. 1006-1010). IEEE.