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Equipment and Materials
Computer Programs and Method
Results and Discussion
1 other sections not shown
534 Aerotech transducer A-mode signal A-scan acoustic impedance adjusting aluminum plate amplifier anthropomorphic anthropomorphic phantom Arenberg attenuator setting average amplitude backscatter Band Pulse-Echo Instrumentation beam broad band analysis broad band pulse-echo calculated attenuation coefficients center frequency cirrhotic correlation coefficient cylinder DALDD a/f Dange data tape dB cm dB/cm dB/cm-MHz dc offset DEDD delay was set depth of examination different attenuating material digitized values display ducer echo amplitude echo signal external attenuator Figure focal region four phantoms lookup table lucite MAMODE mean calculated attenuation Mountford narrow band pulse-echo NBLOCK NBLOCK=NBLOCK number of trials obtain OPDEF oscilloscope peak amplitudes Phantom DD phantom IV possible to scan program ASCAN pulse burst range reflector data regression calculations saran surface scanning window scatter slope speed of sound standard error STD DEV subroutine tissue equivalent gel tissue equivalent material transient recorder ultrasonic Unirad machine vivo human liver waveform Y-intercept YINT