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  1. No Access

    Chapter

    A dynamically focused multiscan system

    Clinical ultrasound instruments with a linear array transducer are nowadays one of the methods which can be used to obtain real time two dimension cardiac images 1), 2), 3). Unlike mechanical sector scanners 4...

    C. M. Ligtvoet, J. Ridder, C. T. Lancée, F. Hagemeijer, W. B. Vletter in Echocardiology (1977)

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    Chapter

    Focussing by Means of Wave Field Extrapolation

    Until now, focussing of ultra-sound has always been represented by a summation procedure along wave-fronts. Generally, the summation procedure will be preceded by time correction as in most practical cases the...

    A. J. Berkhout, J. Ridder in Echocardiology (1979)