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The Sheffield data collection system.

B H Brown, A D Seagar

    Clinical Physics and Physiological Measurement : an Official Journal of the Hospital Physicists' Association, Deutsche Gesellschaft Fur Medizinische Physik and the European Federation of Organisations for Medical Physics
    |January 1, 1987
    PubMed
    Summary
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    This study details a Sheffield data collection system for impedance imaging, highlighting its sensitivity to minute surface potential changes. The system achieves high-speed data acquisition, crucial for clinical applications.

    Area of Science:

    • Electrical Impedance Tomography
    • Biomedical Engineering
    • Medical Imaging

    Background:

    • Surface potential measurements have low sensitivity to internal resistivity changes in volume conductors.
    • Accurate impedance imaging requires detecting peripheral potential profile changes of approximately 0.1%.
    • Physiological processes like lung ventilation and cardiac blood flow cause significant internal resistivity changes, but minimal surface changes.

    Purpose of the Study:

    • To describe the Sheffield data collection system for impedance imaging.
    • To analyze the system's accuracy, focusing on the front-end equivalent circuit and its components.
    • To evaluate the trade-offs between electrode number, spatial resolution, speed, and sensitivity for clinical utility.

    Main Methods:

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  • Utilizes a 16-electrode system with 4 multiplexers for data acquisition.
  • Employs a 5 mA p-p current drive at 5 kHz, multiplexed to adjacent electrode pairs.
  • Records peripheral potential profiles by serially stepping through adjacent electrode pairs.

    • Main Results:

    • The Sheffield system acquires 208 data points per image in 79 ms, providing 10 image data sets per second.
    • System accuracy is significantly influenced by the front-end equivalent circuit, including wiring and multiplexer capacitances.
    • A homogeneous circular conductor shows a maximum to minimum signal ratio of 45:1 within each profile.

    Conclusions:

    • The Sheffield system demonstrates high-speed data acquisition suitable for impedance imaging.
    • Increasing electrode count for higher resolution may compromise essential speed and sensitivity.
    • Speed and sensitivity are critical factors for determining the clinical utility of electrical impedance tomography (EIT).