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Related Experiment Videos

Current source design for electrical impedance tomography.

Alexander S Ross1, G J Saulnier, J C Newell

  • 1Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180-3590, USA. rossa@rpi.edu

Physiological Measurement
|June 19, 2003
PubMed
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A new electrical impedance tomography (EIT) current source was designed for precise breast cancer detection. This novel design achieves high output impedance across multiple frequencies, overcoming previous limitations.

Area of Science:

  • Biomedical Engineering
  • Electrical Engineering
  • Medical Imaging

Background:

  • Electrical impedance tomography (EIT) shows promise for breast cancer detection.
  • High-precision, multi-frequency current sources are crucial for EIT feasibility.
  • Existing current source designs lack the required precision for multi-frequency EIT.

Purpose of the Study:

  • To design and validate a novel current source for multi-frequency EIT applications.
  • To address the need for precise current delivery in breast cancer detection using EIT.
  • To enable independent adjustment of output resistance and capacitance in an EIT current source.

Main Methods:

  • Designed a current source using an enhanced Howland topology in parallel with a generalized impedance converter (GIC).

Related Experiment Videos

  • Simulated output impedances exceeding 2 GOhms across a frequency range of 100 Hz to 1 MHz.
  • Explained the theoretical operation and presented experimental validation of the designed current source.

    • Main Results:

    • Achieved nearly independent adjustment of output resistance and capacitance.
    • Demonstrated simulated output impedances greater than 2 GOhms from 100 Hz to 1 MHz.
    • Experimental results confirmed the feasibility of a high-precision, multi-frequency, capacitance-compensated current source.

    Conclusions:

    • The developed current source design is feasible for high-precision, multi-frequency EIT.
    • This innovation can advance the application of EIT in breast cancer detection.
    • The design overcomes limitations of existing current sources for advanced EIT instrumentation.