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Related Experiment Videos

Coded excitation with spectrum inversion (CEXSI) for ultrasound array imaging.

Yao Wang1, Kurt Metzger, Douglas N Stephens

  • 1Biomedical Engineering Department, University of Michigan, Ann Arbor, MI 48109, USA. ywangz@eecs.umich.edu

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|August 5, 2003
PubMed
Summary

This study introduces coded excitation with spectrum inversion (CEXSI) for improved signal transmission. CEXSI achieves excellent decoding with low side-lobes and enhanced signal-to-noise ratio, beneficial for sparse array imaging.

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Area of Science:

  • Signal processing
  • Acoustic imaging
  • Array signal processing

Background:

  • Traditional imaging systems face challenges with signal-to-noise ratio (SNR) and side-lobe artifacts.
  • Optimizing transmitted signals is crucial for enhancing imaging performance.

Purpose of the Study:

  • To present a novel signal transmission scheme, coded excitation with spectrum inversion (CEXSI).
  • To demonstrate CEXSI's effectiveness in improving decoding accuracy, reducing side-lobes, and boosting SNR.

Main Methods:

  • Encoding an optimal binary code with a flat spectrum as a transmission burst.
  • Deriving the decoding filter directly from the inverse spectrum of the optimal code.
  • Utilizing various transmission techniques for improved energy coupling.

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Main Results:

  • Experimental achievement of low range side-lobes (approx. 40 dB) with minimal compromise in range resolution.
  • Demonstrated signal-to-noise ratio (SNR) improvement of approximately 14 dB.
  • Validation of the CEXSI scheme through simulations and experimental data.

Conclusions:

  • Coded excitation with spectrum inversion (CEXSI) offers a robust method for enhancing signal decoding and imaging quality.
  • The CEXSI scheme shows potential for broad application in improving SNR in sparse array imaging.