Structured scintillators for X-ray imaging with micrometre resolution

Ulrik Lund Olsen, Søren Schmidt, Henning Friis Poulsen, J. Linnros, S.H. Yun, M. Di Michiel, T. Martin

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    A 3D X-ray detector for imaging of 30–200 keV photons is described. It comprises a stack of semitransparent structured scintillators, where each scintillator is a regular array of waveguides in silicon, and with pores filled with CsI. The performance of the detector is described theoretically and explored in detail through simulations. The resolution of a single screen is shown to be determined only by the pitch, at least up to 100 keV. In comparison to conventional homogenous screens an improvement in efficiency by a factor 5–15 is obtainable. The cross-talk between screens in the 3D detector is shown to be negligible. The concept of such a 3D detector enables ray tracing and super resolution algorithms to be applied. Realized pore geometries have a lower aspect ratio than used in simulations and the roughness of the pore walls gives a 13% decrease in waveguide efficiency. Compared to currently used regular scintillators with similar resolution an efficiency increase by a factor 4 has been found for the structured scintillator.
    Original languageEnglish
    JournalNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
    Volume607
    Issue number1
    Pages (from-to)141-144
    ISSN0168-9002
    DOIs
    Publication statusPublished - 2009

    Keywords

    • Materials characterization and modelling
    • Materials research

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