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Velocity and Attenuation of Ultrasonic Waves
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absorption acoustic impedance angle aortic array attenuation axial B-scan backscattered blood velocity/time waveform blood vessel calibration carotid cathode ray tube cavitation cell characteristic impedance delay line described detection diagnostic diameter diffraction digitisation direction display distribution Doppler Doppler-shift Doppler-shift frequency Doppler-shift signal dynamic range echo amplitude energy equation flow foetal heart hydrophone illustrated in figure incident intensity investigation kind permission liquid liver maximum measured medium method mitral valve molecules normal occlusion output patient phase piezoelectric position posterior tibial posterior tibial artery probe produced Professor K J W Taylor propagation pulse pulse-echo recorder relaxation process rotation scan converter scanner scattering shear shown in figure spectrum storage stress wave structure supra-orbital artery swept gain systolic systolic pressure target thermocouple time-position scan tissue transducer transient recorder transmitted tube two-dimensional typical ultrasonic ultrasonic beam ultrasonic field ultrasonic wave ultrasound velocity viscosity visualisation waveform wavelength zero-crossing