Golay Coded Sequences in Synthetic Aperture Imaging Systems

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Authors

  • Ihor TROTS Department of Ultrasound Institute of Fundamental Technological Research Polish Academy of Sciences
  • Yuriy TASINKEVYCH Department of Ultrasound Institute of Fundamental Technological Research Polish Academy of Sciences
  • Andrzej NOWICKI Department of Ultrasound Institute of Fundamental Technological Research Polish Academy of Sciences
  • Marcin LEWANDOWSKI Department of Ultrasound Institute of Fundamental Technological Research Polish Academy of Sciences

Abstract

The paper presents the theoretical and experimental study of synthetic trans- mit aperture (STA) method combined with Golay coded transmission for medical ultrasound imaging applications. The transmission of long waveforms characterized by a particular autocorrelation function allows to increase the total energy of the transmitted signal without increasing the peak pressure. It can also improve signal- to-noise ratio and increase the visualization depth maintaining the ultrasound image resolution. In the work the 128-element linear transducer array with 0.3 mm pitch excited by the 8 and 16-bits Golay coded sequences as well as a one cycle at nominal frequencies 4 MHz were used. The comparison of 2D ultrasound images of the tissue mimicking phantoms is presented to demonstrate the benefits of coded transmission. The image reconstruction was performed using synthetic STA algorithm with transmit and receive signals correction based on a single element directivity function.

Keywords:

ultrasound imaging, synthetic aperture, beamforming, radiation pattern, coded sequences, Golay codes

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