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ACT3: a high-speed, high-precision electrical impedance tomograph

R D Cook1, G J Saulnier, D G Gisser

  • 1Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180.

IEEE Transactions on Bio-Medical Engineering
|August 1, 1994
PubMed
Summary

Rensselaer

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Area of Science:

  • Electrical Engineering
  • Biomedical Imaging
  • Applied Physics

Background:

  • Electrical impedance tomography (EIT) is a non-invasive imaging technique.
  • Previous generations of Adaptive Current Tomograph (ACT) systems have demonstrated EIT's potential.
  • Advancements in instrumentation are crucial for improving EIT system performance and applications.

Purpose of the Study:

  • To present the design, implementation, and performance of the third-generation Adaptive Current Tomograph (ACT3).
  • To detail the system's capabilities for applying arbitrary current patterns and high-precision measurements.
  • To demonstrate the system's utility in various imaging scenarios.

Main Methods:

  • Developed a 32-electrode system using 32 current sources and 32 phase-sensitive voltmeters.
  • Achieved 16-bit precision for current and voltage measurements, with data acquisition in 133 ms.
  • Integrated automated calibration and computer-controlled output impedance adjustment.

Main Results:

  • Demonstrated the ACT3 system's ability to apply arbitrary spatial current patterns.
  • Achieved high-precision measurements and rapid data collection for image reconstruction.
  • Successfully imaged stationary targets, a moving pendulum, and in vivo human respiration patterns.

Conclusions:

  • The ACT3 represents a significant advancement in EIT instrumentation.
  • The system's performance and versatility enable robust imaging for diverse applications.
  • ACT3 facilitates detailed resistivity profiling, including physiological processes like respiration.

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