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Related Experiment Video

Updated: Jan 18, 2026

Hand-held Clinical Photoacoustic Imaging System for Real-time Non-invasive Small Animal Imaging
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A High-Performance Self-Collimation SPECT for Small Animal Imaging.

Debin Zhang, Zhenlei Lyu, Tianpeng Xu

    IEEE Transactions on Medical Imaging
    |January 16, 2026
    PubMed
    Summary
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    This study introduces the first full-ring self-collimation SPECT scanner for small animal imaging. The novel SC-SPECT system overcomes resolution-sensitivity trade-offs, achieving superior performance and CT-like resolution in mouse imaging.

    Area of Science:

    • Medical Imaging
    • Nuclear Medicine
    • Biomedical Engineering

    Background:

    • Conventional single-photon-emission computed tomography (SPECT) faces a trade-off between imaging resolution and sensitivity.
    • Existing SPECT systems struggle to simultaneously achieve high resolution and high sensitivity, limiting small animal imaging applications.

    Purpose of the Study:

    • To design and evaluate the first full-ring self-collimation SPECT (SC-SPECT) scanner for enhanced small animal imaging.
    • To overcome the resolution-sensitivity limitations inherent in traditional SPECT systems through a novel detector self-collimation concept.

    Main Methods:

    • Developed a full-ring SC-SPECT scanner with four concentric detector rings and interchangeable tungsten collimator rings (high-resolution and general-purpose).
    • Utilized GAGG(Ce) scintillators with dual-end SiPM readouts for axial depth-of-interaction measurements.

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    Last Updated: Jan 18, 2026

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  • Conducted phantom and mouse studies to assess resolution, sensitivity, and field-of-view performance.

    • Main Results:

    • The SC-SPECT system demonstrated generally superior performance compared to state-of-the-art small-animal SPECT systems.
    • Achieved CT-like resolution in mouse bone imaging using 99mTc-MDP, clearly visualizing tracer uptake in small structures.
    • The detector self-collimation design effectively enhanced photon collimation for improved image quality.

    Conclusions:

    • The developed SC-SPECT scanner represents a significant technological advancement for small-animal SPECT imaging.
    • The novel detector self-collimation approach successfully addresses the resolution-sensitivity trade-off, enabling high-resolution imaging of small biological structures.
    • SC-SPECT shows great promise for preclinical research requiring detailed visualization of radiotracer distribution.