Ultrasonic Instrumentation for Recording Lateral Pharyngeal Wall Motion
Charles A. Kelsey, Thomas J. Hixon, Fred D. Minifie · The Journal of the Acoustical Society of America · 1968
Pulsed ultrasound has been used to monitor and record the motion of the lateral pharyngeal wall during speech. A time-motion (T.M.) method of display was recorded on the screen of a storage oscilloscope. An audio signal was simultaneously displayed and permanent records were made by photographing the storage oscilloscope screen. Tests were conducted to insure that the recorded signals were produced by the motion of the lateral pharyngeal wall. Distance calibration was made using a known displacement in a water bath. The effect of different ultrasonic frequencies was investigated by making measurements with both 2.25- and 5-MHz ultrasound beams. The results of all the measurements are reported in the following paper. [This research was supported by the National Institutes of Health.]