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A fully parallel multi-frequency EIT system with flexible electrode configuration: KHU Mark2.

Tong In Oh1, Hun Wi, Do Yub Kim

  • 1Impedance Imaging Research Center and Department of Biomedical Engineering, Kyung Hee University, Korea.

Physiological Measurement
|June 8, 2011
PubMed
Summary
This summary is machine-generated.

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The KHU Mark2 is a new multi-frequency electrical impedance tomography (EIT) system designed for faster, more flexible physiological monitoring. It enables advanced spectroscopic EIT imaging with improved data acquisition speeds and parallel operations.

Area of Science:

  • Biomedical Engineering
  • Medical Imaging Technology
  • Electrical Engineering

Background:

  • Electrical Impedance Tomography (EIT) is a non-invasive imaging technique.
  • Previous systems like KHU Mark1 laid the groundwork for improved EIT technology.
  • There is a need for faster and more flexible EIT systems for dynamic physiological monitoring.

Purpose of the Study:

  • To report the development of the KHU Mark2, a novel multi-frequency EIT system.
  • To detail the design, construction, calibration, and performance evaluation of the KHU Mark2.
  • To highlight the system's capabilities for spectroscopic EIT imaging and fast physiological change detection.

Main Methods:

  • The KHU Mark2 utilizes digital waveform generation, Howland current sources, and digital phase-sensitive demodulators.

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  • It features flexible electrode configurations, multiple independent current sources/voltmeters for parallel operations, and a pipeline structure for high-speed data acquisition.
  • The system employs impedance measurement modules (IMMs) for multi-channel construction (16, 32, or 64 channels).

    • Main Results:

    • The KHU Mark2 achieves a maximum data acquisition speed of 100 scans s(-1).
    • It demonstrates a signal-to-noise ratio of approximately 84 dB and a reciprocity error of 0.5%.
    • Spectroscopic admittivity images were successfully generated from time-difference images of an admittivity phantom.

    Conclusions:

    • The KHU Mark2 represents a significant advancement in multi-frequency EIT system design.
    • Its enhanced features enable high-speed, flexible, and spectroscopic EIT imaging.
    • The system is well-suited for detecting rapid physiological changes and has potential for future clinical applications.