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Complementary Detection of Multiple Electrical Sources in Tissue Using Acoustoelectric Effects.

Zhaohui Wang1, Rajab Challoo1, Hu Peng2

  • 1Department of Electrical Engineering and Computer Science, Texas A&M University-Kingsville, Kingsville, Texas, USA.

Ultrasound in Medicine & Biology
|July 5, 2016
PubMed
Summary

This study introduces ultrasound current source density imaging for precise 3-D mapping of bioelectric activity in nerve fibers. This novel method enhances signal detection for improved neural abnormality diagnosis.

Keywords:
AcoustoelectricBioelectricElectroencephalographyElectrophysiologyMapping

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Medical Imaging

Background:

  • Accurate 3-D mapping of bioelectric sources in nerve fibers is crucial for diagnosing neural abnormalities.
  • Conventional electrophysiology faces limitations in achieving high spatial resolution for mapping electrical current flow in tissues.
  • The acoustoelectric (AE) effect offers a promising alternative for imaging electrical activity.

Purpose of the Study:

  • To evaluate the efficacy of ultrasound current source density imaging for mapping multiple bioelectric sources.
  • To assess the advantages of AE imaging combined with Wheatstone bridge circuits over conventional methods.
  • To demonstrate the capability of real-time 3-D AE imaging for potential neurological disorder monitoring.

Main Methods:

  • Utilized ultrasound current source density imaging exploiting the acoustoelectric effect.
  • Employed two complementary Wheatstone bridge circuits for simultaneous detection of induced current flows in tissue phantoms.
  • Acquired and analyzed acoustoelectric (AE) signals under varying source configurations and ultrasound field parameters (2.25-MHz transducer).

Main Results:

  • Addition and subtraction of AE signals from two circuits yielded independent components, irrespective of source depth.
  • Wheatstone bridge circuits significantly amplified the AE signal, improving the signal-to-noise ratio compared to no bridge circuit.
  • Experimental AE images accurately reflected simulated results, correlating with current magnitude, direction, source geometry, and location.

Conclusions:

  • Ultrasound current source density imaging, particularly with Wheatstone bridge circuits, provides enhanced signal detection for mapping bioelectric activity.
  • The technique demonstrates accurate 3-D imaging of multiple current sources, consistent with simulations.
  • Real-time 3-D AE imaging co-registered with ultrasound shows potential for monitoring neurological disorders.