Archives of Acoustics, 14, 1-2, pp. 111-121, 1989

Preliminary ultrasonographic studies on an electronic system for focusing an ultrasonic beam

Tomasz WASZCZUK
Institute of Fundamental Technological Research, Polish Academy of Sciences
Poland

Grażyna ŁYPACEWICZ
Institute of Fundamental Technological Research, Polish Academy of Sciences
Poland

Jan SOMER
University of Limburg
Netherlands

In conventional mechanical contact scanners the lateral resolution is inferior to the axial one. Improving the lateral resolution over a wide range of depth requires the use of variable focusing system. We choose the phase annular array system which may be used in obstetrics and gynaecology.
Measurements of the ultrasonic beam were carried out. Visualisations two different phantoms AIUM-100 and RMI-402 were performed during work: a typical B-scanner, and the annular array system. The results indicate a considerable increase in the lateral resolution when works the annular array system.
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Copyright © Polish Academy of Sciences & Institute of Fundamental Technological Research (IPPT PAN).

References

G. KossoFF et al., Annular phased arrays in ultrasonic obstetrical examinations, Advanced Study Institute, Ultrasonic Diagnostics, Milan, June 1974.

H. E. MELTON, F. L. THURSTONE, Annular array design and logaritmic processing for ultrasonic imaging, Ultrasound in Medicine and Biology, 4, 1-12 (1978).

O. von RAMM, S. W. SMITH, Beam steering with linear arrays, IEEE Transactions on Biomedical Engineering, 30, 8 (1983).

T. WASZCZUK, J. SOMER, A system for dynamic focusing of an ultrasonic beam by annular transducers [in Polish], Proc. XXVII Open Seminar on Acoustics, Warszawa-Puławy, September 1980.

T. WASZCZUK, T. KUJAWSKA, J. SOMER, Focusing of an ultrasonic beam by means of a piezoelectric annular array, Archives of Acoustics, 3, 3, 185-204 (1983).