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Narrowband Array Processing Beamforming Technique for Electrical Impedance Tomography.

Venkatratnam Chitturi1, Nagi Farrukh2

  • 1Asia Pacific University of Technology and Innovation, TPM, Bukit Jalil, Malaysia.

Journal of Electrical Bioimpedance
|February 15, 2021
PubMed
Summary
This summary is machine-generated.

Electrical impedance tomography (EIT) uses beamforming to locate objects by analyzing electrode voltages. This novel approach offers complementary spatial data for improved object positioning in EIT systems.

Keywords:
Array processingEIDORSbeamformingelectrical impedance tomographynumerical methodssource localization

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Area of Science:

  • Engineering
  • Signal Processing
  • Imaging Techniques

Background:

  • Electrical impedance tomography (EIT) is a developing 2D imaging technique with broad engineering applications.
  • Beamforming, originating from array signal processing, excels at spatial filtering for object localization.

Purpose of the Study:

  • To apply beamforming techniques to an EIT system for object localization.
  • To treat EIT electrodes as a sensor array for spatial filtering.

Main Methods:

  • An EIT system collected electrode voltages from a test tank.
  • Elliptic partial differential equations were used for voltage interpolation.
  • A narrowband beamformer identified signal peaks to localize objects.

Main Results:

  • Beamforming successfully localized test objects within the EIT system.
  • The technique provided complementary information for accurate object positioning.
  • An eight-electrode EIT system demonstrated the feasibility of this method.

Conclusions:

  • Beamforming can serve as a secondary method for precise object localization in EIT.
  • This approach reframes the EIT inverse problem as source localization rather than image reconstruction.
  • New avenues for spatial EIT data filtering techniques are proposed.