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Related Experiment Videos

Coded pulse excitation for ultrasonic strain imaging.

Jie Liu1, Michael F Insana

  • 1Department of Biomedical Engineering, University of California Davis, Davis, CA, USA. jieliu@ucdavis.edu

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|April 2, 2005
PubMed
Summary

Coded excitation significantly reduces decorrelation strain noise in ultrasound imaging, improving echo-signal-to-noise ratio (eSNR) and image depth. Chirp and Golay codes offer robust performance for soft tissue deformation imaging.

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Area of Science:

  • Medical Imaging
  • Biomedical Ultrasound
  • Acoustic Signal Processing

Background:

  • Decorrelation strain noise degrades ultrasound strain imaging quality, especially in low echo-signal-to-noise (eSNR) conditions.
  • Coded excitation techniques offer potential for noise reduction and improved imaging performance.

Purpose of the Study:

  • To evaluate the effectiveness of coded excitation in reducing decorrelation strain noise in ultrasound strain imaging.
  • To compare the performance of different aperiodic codes (chirp, Barker, suboptimal, Golay) against conventional short pulses under varying noise and attenuation conditions.

Main Methods:

  • Transmission of large time-bandwidth-product pulses into tissue-mimicking phantoms with simulated breast lesions.
  • Comparative analysis of strain imaging performance using short pulses and four aperiodic codes.

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  • Quantification of imaging performance using SNR for displacement (SNRd), local modulation transfer function (LMTF), and contrast-to-noise ratio for strain (CNRepsilon).

    • Main Results:

    • A 5-10 dB improvement in eSNR was observed with coded excitation in low eSNR conditions, doubling the depth of focus without sacrificing spatial resolution.
    • In high eSNR conditions, coded excitation enabled higher carrier frequencies and shorter correlation windows, enhancing spatial resolution.
    • Chirp and Golay codes demonstrated the most robust performance for soft tissue deformation imaging with matched filter decoding.

    Conclusions:

    • Coded excitation is effective in reducing decorrelation strain noise, enhancing eSNR and imaging depth in ultrasound strain imaging.
    • Chirp and Golay codes provide a favorable balance of low-range lobes, significant eSNR improvement, and short code duration, making them suitable for soft tissue imaging.
    • The findings support the use of coded excitation, particularly chirp and Golay codes, for improved ultrasound strain imaging in challenging noise-limited environments.