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An adaptive current tomography using voltage sources

Q Zhu1, W R Lionheart, F J Lidgey

  • 1Electrical Impedance Tomography Research Group, Oxford Brookes University, UK.

IEEE Transactions on Bio-Medical Engineering
|February 1, 1993
PubMed
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This study introduces an adaptive electric current tomography system with a novel analog front-end. The system uses programmable voltage sources and digital demodulation for high-quality imaging.

Area of Science:

  • Electrical Engineering
  • Biomedical Imaging
  • Tomography

Background:

  • Electric Current Tomography (ECT) systems face challenges with current source quality and data acquisition.
  • Developing adaptive systems is crucial for improved imaging performance.

Purpose of the Study:

  • To develop a novel adaptive electric current tomography system.
  • To overcome limitations of traditional current source implementations in ECT.

Main Methods:

  • Utilized a novel front-end analog architecture with programmable voltage sources.
  • Employed admittance matrix inversion to achieve desired current drive patterns.
  • Implemented a digital demodulation scheme to enhance signal-to-noise ratio (SNR).
  • System operates at 9.6 kHz with 32 driving and 32 measurement electrodes.

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Main Results:

  • Successfully developed an adaptive ECT system with programmable voltage sources.
  • Achieved high SNR in data acquisition through digital demodulation.
  • Obtained in vitro reconstruction images using the developed tomograph.

Conclusions:

  • The novel adaptive ECT system demonstrates effective current delivery and data acquisition.
  • The system's architecture and digital processing enhance imaging capabilities.
  • The developed tomograph shows potential for in vitro imaging applications.