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The Value of Ultrasound
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A-mode abdomen acoustic adjusted amplifier angle B-scan B-scanner beam axis bistable bladder bright-up brightness calibration caliper centimetres cephalometry clinical compensation controls crown-rump length cyst decibel depth detected device diagnostic diaphragm direction display Doppler dynamic range echo amplitude echo signals edge electronic examination exposure fetal head fetal trunk fetus film frequency gallbladder gallstones gestation sac gestational age grey-scale increased initial attenuation intensity interface kidney linear liver Longitudinal scan machine maximum measurement menstrual age midline moving normal obtained oscilloscope pancreas parasagittal scan parietal bones patient picture placenta praevia position posterior pregnancy probe produce real-time scanner reflected reflector resolution result reverberant echoes scale scanning plane screen seen skin small echoes sound beam sound pulse specular reflection speed spine spot structures system sensitivity target technique timebase tion tissue transducer transverse scans tumour ultrasonic ultrasonic beam ultrasound usually uterine uterus voltage wave wavelength weeks