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The Aberdeen Impedance Imaging System.

V Kulkarni, J M Hutchison, J R Mallard

    Biomedical Sciences Instrumentation
    |January 1, 1989
    PubMed
    Summary
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    The Aberdeen Impedance Imaging System reconstructs 2D impedance images using a 16-electrode array. This system enables detailed imaging of complex impedance changes, crucial for applications like fracture healing monitoring.

    Area of Science:

    • Biomedical Engineering
    • Medical Imaging
    • Electrical Impedance Tomography

    Background:

    • Complex impedance imaging offers a non-invasive method for visualizing tissue properties.
    • Accurate reconstruction of impedance amplitude and phase is essential for diagnostic applications.

    Purpose of the Study:

    • To describe the Aberdeen Impedance Imaging System for reconstructing 2D images of complex impedance distribution.
    • To detail the hardware and software components enabling impedance imaging.
    • To explore the system's potential for monitoring dynamic physiological changes, such as fracture healing.

    Main Methods:

    • Utilizes a 16-electrode split-array with the four-electrode technique.
    • Employs specialized electronic modules for current driving, signal acquisition, and processing.

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  • Image reconstruction is performed using convolution-backprojection (Equipotential Backprojection).
  • Data acquisition involves a microprocessor-controlled sequence with averaging and disk storage.

    • Main Results:

    • The system successfully reconstructs 2D images of impedance amplitude and phase.
    • Potential for imaging significant impedance changes, like those in fracture healing.
    • Methodology for monitoring drift using contralateral limb imaging is proposed.

    Conclusions:

    • The Aberdeen Impedance Imaging System provides a robust platform for complex impedance imaging.
    • The system's capabilities are suitable for dynamic tissue monitoring and characterization.
    • Further improvements in quadrature signal retrieval can enhance tissue characterization.