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1 Bulletin of the Polish Academy of Sciences. Technical Sciences

1 2004

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Extending penetration depth using coded ultrasonography

Nowicki A., Secomski W., Trots I., Litniewski J.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2004

Vol. 52, nr 3

215-220

The issue of maximizng penetration depth with concurrent retaining or enhancement of image resolution constitutes one of the time in variant challenges in ultrasound imaging. Concerns about potential and undesirable side effects set limits on the possibility of overcoming the frequency depended attuenuation effects by increasing peak acoustic amplitudes of the waves probing the tissue. To overcome this limitation a pulse compression technique employing 16 bits Complementary Golay Sequences (CGS) Code was implemented at 4 MHz. In comparison with other, erlier proposed excitation schemes, such as chirp, pseudo-random chirp and Barker codes, the CGS allowed virtually side lobe free operation. Experimental data indicate that the quality - resolution, signal penetration and contrast dynamics - of CGS images is better then the one obtain standard ultrasonography using short burst excitation.