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THE ULTRASONIC FIELD
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A-scan A-scope absorption coefficient acoust amplitude applications arranged attenuation B-scope bandwidth biological bistable cathode ray tube characteristic impedance circuit clinical constant corresponding decibels demodulator described detection diagram diode display Doppler Doppler shift dynamic range dynamic range compression echo amplitude effect electrical electronic energy Equation example focussing Fresnel zone holography Hueter illustrated in Fig increased input intensity interface Kossoff lateral resolution limited linear liver maximum measurement medium megahertz method mitral noise noise figure non-linear normal obtained occurs output particle piezoelectric potentiometer probe propagation pulse-echo system r.f. amplifier radiation range resolution ratio receiver reflector resistance scanner scanning Section sensitivity shown in Fig signal soft tissues stage storage tube stress wave surface swept gain target technique time-base tion trans transducer transistor transmission transmitter trigger typical ultrasonic ultrasonic beam ultrasonic diagnosis ultrasonic field ultrasonic frequency ultrasonic pulse ultrasound valve velocity video amplifier voltage waveform wavelength