Abstract
The main objective of this study is to improve the ultrasound image by
employing a new algorithm based on transducer array element beam pattern
correction implemented in the synthetic transmit aperture (STA) method
combined with emission of mutually orthogonal complementary Golay
sequences. Orthogonal Golay sequences can be transmitted and received by
different transducer elements simultaneously, thereby decreasing the time
of image reconstruction, which plays an important role in medical
diagnostic imaging.
The paper presents the preliminary results of computer simulation of the
synthetic aperture method combined with the orthogonal Golay sequences in
a linear transducer array. 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 the signal-to-noise ratio and increase the
visualization depth maintaining the ultrasound image resolution.
In the work, the 128-element linear transducer array with a 0.3 mm pitch
excited by 8-bits Golay coded sequences as well as one cycle at nominal
frequencies of 4 MHz were used. The comparison of 2D ultrasound images of
the phantoms is presented to demonstrate the benefits of a coded
transmission. The image reconstruction was performed using the synthetic
STA algorithm with transmit and receive signals correction based on a
single element directivity function.
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