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Practical spread spectrum pulse compression for ultrasonic tissue imaging.

L R Welch1, M D Fox

  • 1Technol. Services Corp., Silver Spring, MD.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|February 5, 2008
PubMed
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This study demonstrates spread spectrum pulse compression using a 13-bit Barker code for ultrasonic imaging. The technique successfully improved signal-to-noise ratio by 11 dB while maintaining over 30 dB dynamic range.

Area of Science:

  • Signal Processing
  • Ultrasonic Imaging
  • Biomedical Engineering

Background:

  • Spread spectrum pulse compression enhances critical system performance.
  • Ultrasonic imaging requires improved signal-to-noise ratio and dynamic range.

Purpose of the Study:

  • To design and construct a digital, real-time, Barker coded, bi-phase modulator for ultrasonic pulse compression.
  • To evaluate the performance of spread spectrum pulse compression in an ultrasonic test tank.

Main Methods:

  • A digital, real-time, Barker coded, bi-phase modulator was designed and built.
  • An ultrasonic test tank with synthetic targets and goat liver was used.
  • Cross-correlation with a sidelobe suppression filter was performed on received echoes.

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Main Results:

  • A 13-bit Barker code compression achieved an 11 dB increase in signal-to-noise ratio.
  • Over 30 dB of instantaneous dynamic range was maintained.
  • Practical limitations necessitate short code lengths for ultrasonic pulse compression.

Conclusions:

  • Spread spectrum pulse compression is effective for enhancing ultrasonic imaging performance.
  • The developed system achieved significant improvements in signal-to-noise ratio and dynamic range.
  • Further research may explore longer code lengths or alternative compression techniques.