Ultrasonic measurement of larynx height and vocal fold vibratory pattern

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Abstract
The modification and extension of an ultrasonic through-transmission technique for examining vocal fold activity is described. Lateral resolution in the cranio-caudal dimension was advanced. A transducer was specially designed to produce an eliptical beam so that a measurable signal is received through the extreme upper and lower edges of the vibrating vocal folds. Amplitude variation within the ultrasonic waveform is interpreted. A single [human] subject is illustrated.

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