Acoustical Imaging, Vol. 25 by Michael Halliwell, Peter N.T. Wells

By Michael Halliwell, Peter N.T. Wells

The foreign Symposium of Acoustical Imaging has been well known because the most well known discussion board for shows of complicated study lead to either theoretical and experimental improvement. Held on a regular basis considering 1968, the symposium brings jointly overseas major researchers within the zone of acoustical imaging. The court cases from the twenty fifth assembly comprises articles at the following themes: arithmetic and Physics of Acoustical Imaging, Transducers and Arrays, Nondestructive overview, Geophysical and Underwater Ultrasonics, Microscopy and Microscanning, Scattering via Blood and Tissue, scientific and organic picture Formation, Tissue Characterization, Tissue and movement and Blood circulate, Elasticity Imaging, difficult Tissues, and Novel and rising tools.

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Hence, the apparent superluminal behaviour of the edge wave component, as revealed by a point hydrophone measurement, is an artefact caused by the mesurement technique and the geometry of that wave component. It is not an unexpected feature of the physics of wave propagation. The existence of superluminal components in more complicated pulsed fields may also be ascribed to geometrical factors, as above. THE DIRECTIVITY FUNCTION The directivity function is an important feature when characterising transducer fields.

1985; Dutt en Greenleaf 1995) and depends on the density of scatterers (Eqs. 19,21). , 1991). The second order statistics are used to describe and quantify the relations between neighbouring pixels. , 1985; cf. Fig. , 1985): Where: of spectrum corresponding to transmitted vs. pulse, Eq. e. high scatterer number density) in the focal zone. It may be remarked, that the single scatterer case, corresponding to the point-spreadfunction (PSF) of the used transducer can be written in formulas similar to Eq.

Freq. Control 46: 126-38. , 1988, Tissue characterization based on scatterer number density estimation, IEEE Trans. Ultrasonics Ferroel. Freq. Control UFFC-35: 749-57. , 1994, Theoretical analysis and verification of ultrasound displacement and strain imaging, IEEE Trans. Ultrason. Ferroel. Freq. Contr. UFFC-41: 302-13. , 1980, Ultrasonic Tissue Characterization: Clinical Achievements and Technological Potentials, Stafleu, Alphen aan de Rijn. , Dr. W. Junk Publishers, The Hague. 431-9. , 1993, Correlations between acoustic and texture parameters from rf- and B-mode liver echograms, Ultrasound Med.

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