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Proceedings Paper

Gray Scale Imaging With Complex TGC And Transducer Arrays
Author(s): O. T. von Ramm; S. W. Smith; F. L. Thurstone
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Paper Abstract

Ultrasound imaging of soft tissues places severe demands on the design of imaging systems because of the large range of echo amplitudes which may be encountered at any point in the body. Simple TGC curves are often inadequate in producing optimum gray scale images since the ultrasound traverses a variety of structures with substantially different attenuation coefficients. Phased array systems are shown to suffer from increased image ambiguity as compared to simple transducers, a result of discrete sampling of the aper-ture, which reduces the effective dynamic range which can be presented accurately. For a 16 element 1.7MHz array with 1.76 wavelengths interelement spacing the maximum side-lobes are only 6db below the main lobe. The use of different transmit and receive array geometries can improve the overall system spatial response. Experimental results from a 16 element 1.7 MHz transmit array with .88 wavelength interelement spacing and a receive array of the same frequency with 1.76 wavelength spacing indicated a reduction in the sidelobes to 13db below that of the main beam.

Paper Details

Date Published: 25 March 1976
PDF: 5 pages
Proc. SPIE 0070, Application of Optical Instrumentation in Medicine IV, (25 March 1976); doi: 10.1117/12.954609
Show Author Affiliations
O. T. von Ramm, Duke University (United States)
S. W. Smith, Duke University (United States)
F. L. Thurstone, Duke University (United States)

Published in SPIE Proceedings Vol. 0070:
Application of Optical Instrumentation in Medicine IV
Joel E. Gray; William R. Hendee, Editor(s)

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