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