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Current-conveyor-based wide-band current driver for electrical impedance tomography.

A J Rao1, E K Murphy1, M Shahghasemi1

  • 1Thayer School of Engineering, Dartmouth College, Hanover, NH, United States of America.

Physiological Measurement
|March 5, 2019
PubMed
Summary
This summary is machine-generated.

This study presents a wide-band integrated current driver for electrical impedance tomography (EIT) applications, crucial for cancer detection. The driver achieves low harmonic distortion and high accuracy up to 10 MHz.

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Area of Science:

  • Electrical Engineering
  • Biomedical Engineering
  • Medical Imaging

Background:

  • Electrical Impedance Tomography (EIT) is a non-invasive imaging technique.
  • Accurate current drivers are essential for high-resolution EIT.
  • Prostate and breast cancer detection require interrogation at frequencies up to 10 MHz.

Purpose of the Study:

  • To develop and characterize a wide-band integrated current driver for EIT.
  • To achieve low harmonic distortion and high accuracy for medical imaging applications.
  • To enable advanced active electrode functionalities in EIT systems.

Main Methods:

  • A current conveyor architecture was employed for the current driver design.
  • The driver was fabricated using advanced CMOS 0.18 μm technology.
  • Performance was evaluated through harmonic distortion and output impedance measurements.

Main Results:

  • The driver delivers 1.2 mA peak-to-peak AC current across 100 Hz-10 MHz.
  • Measured harmonic distortion is below [Formula: see text] for frequencies < 100 kHz, rising to [Formula: see text] at 10 MHz.
  • High output impedance (101 kΩ at 1 MHz, 19.5 kΩ at 10 MHz) was achieved.

Conclusions:

  • The developed current driver is suitable for high-frequency EIT.
  • Its performance characteristics support accurate tissue interrogation for cancer detection.
  • The integrated design offers potential for miniaturized and efficient EIT systems.