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acoustic variable AIUM amplitude attenuation coefficient axial resolution bandwidth beam diameter beam uniformity ratio bioeffects boundary cathode ray tube continuous-wave dB/cm decibels decreases density diagnostic ultrasound display distance doppler effect doppler instruments doppler shift duty factor dynamic range echoes equal equation Figure focusing frame rate frequency MHz gray-scale half-intensity depth hydrophone imaging depth incidence angle incident intensity increases intensity reflection coefficient Kremkau lateral resolution linear lines per frame megahertz mm/us mode motion near-zone length number of cycles occurs operating frequency perpendicular incidence phased array pixel produced propagation speed pulse duration pulse repetition frequency pulse repetition period pulsed doppler pulsed ultrasound pulser quency rayls real-time receiver reflector refraction Reprinted with permission rod group SATA intensity scan converter scattering Section soft tissue sound beam spatial pulse length SPTA test object tion transducer element transmission angle True or false ultrasound imaging ultrasound pulse voltage pulses wave wavelength