Development of ultrahigh resolution radiation imaging detector using 1 mm channel size Si-PM array combined with 0.2 mm × 0.2 mm pixelated GAGG plate

S. Yamamoto, Jun Kataoka, T. Fukuchi, K. Kamada, A. Yoshikawa

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    For precise distribution measurements of gamma photons or beta particles, high resolution radiation imaging detectors are required. Reducing the size of the photodetectors combined with small pixel scintillators is a possible method to improve the spatial resolution of the scintillator based radiation imaging detectors. In this paper, we used a 1mm channel size silicon photomultiplier (Si-PM) array combined with a small pixel scintillator array and evaluated the performance for gamma photons and beta particles. For the radiation imaging detector, a Si-PM array with 1mm × 1mm channel size arranged in 8 × 8 (Hamamatsu, S13615-1025N-08) was optically coupled to a 0.2 mm × 0.2 mm pixelated GAGG plate. For 662 keV high energy gamma photons, 0.2mm GAGG pixels were clearly resolved in the position histogram. The peak to valley ratio (P/V) of the position histogram was not improved when only photo-peak events were used while it was improved when the events lower energy than the Compton edge was used. We could also resolve the position histograms for both 122 keV and 60 keV gamma photons. For beta particles, although the position histogram showed good separation for relatively low energy beta particles of Ca-45 (245 keV max), separation became worse for higher energy beta particles from Sr-Y-90 (545keV and 2280keV max). The separation of the position histogram for Sr-Y-90 improved when only lower energy events were used. Using 1mm size Si-PM array, high resolution detectors was realized for low energy gamma photons and beta particle but the spatial resolution was decreased for high energy beta particles from Sr-Y-90.

    Original languageEnglish
    Article numberP05028
    JournalJournal of Instrumentation
    Volume13
    Issue number5
    DOIs
    Publication statusPublished - 2018 May 29

    Fingerprint

    beta particles
    Photomultipliers
    Silicon
    Photons
    Radiation
    Imaging
    Detector
    histograms
    Detectors
    Histogram
    Imaging techniques
    Photon
    Phosphors
    detectors
    silicon
    radiation
    Scintillator
    Pixels
    scintillation counters
    photons

    Keywords

    • Gamma camera, SPECT, PET PET/CT, coronary CT angiography (CTA)
    • Gamma detectors (scintillators, CZT, HPG, HgI etc)
    • Photon detectors for UV, visible and IR photons (solid-state) (PIN diodes, APDs, Si-PMTs, G-APDs, CCDs, EBCCDs, EMCCDs etc)
    • Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators)

    ASJC Scopus subject areas

    • Instrumentation
    • Mathematical Physics

    Cite this

    Development of ultrahigh resolution radiation imaging detector using 1 mm channel size Si-PM array combined with 0.2 mm × 0.2 mm pixelated GAGG plate. / Yamamoto, S.; Kataoka, Jun; Fukuchi, T.; Kamada, K.; Yoshikawa, A.

    In: Journal of Instrumentation, Vol. 13, No. 5, P05028, 29.05.2018.

    Research output: Contribution to journalArticle

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    AU - Kamada, K.

    AU - Yoshikawa, A.

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    AB - For precise distribution measurements of gamma photons or beta particles, high resolution radiation imaging detectors are required. Reducing the size of the photodetectors combined with small pixel scintillators is a possible method to improve the spatial resolution of the scintillator based radiation imaging detectors. In this paper, we used a 1mm channel size silicon photomultiplier (Si-PM) array combined with a small pixel scintillator array and evaluated the performance for gamma photons and beta particles. For the radiation imaging detector, a Si-PM array with 1mm × 1mm channel size arranged in 8 × 8 (Hamamatsu, S13615-1025N-08) was optically coupled to a 0.2 mm × 0.2 mm pixelated GAGG plate. For 662 keV high energy gamma photons, 0.2mm GAGG pixels were clearly resolved in the position histogram. The peak to valley ratio (P/V) of the position histogram was not improved when only photo-peak events were used while it was improved when the events lower energy than the Compton edge was used. We could also resolve the position histograms for both 122 keV and 60 keV gamma photons. For beta particles, although the position histogram showed good separation for relatively low energy beta particles of Ca-45 (245 keV max), separation became worse for higher energy beta particles from Sr-Y-90 (545keV and 2280keV max). The separation of the position histogram for Sr-Y-90 improved when only lower energy events were used. Using 1mm size Si-PM array, high resolution detectors was realized for low energy gamma photons and beta particle but the spatial resolution was decreased for high energy beta particles from Sr-Y-90.

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    KW - Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators)

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