Abstract
A 5‐mm stainless steel ball bearing was affixed to the tongue using dental impression material and imaged visually with real time ultrasound. The pellet was used to measure movement at a single point on the tongue surface during speech and swallowing gestures. The pellet was placed at midline, a measured distance posterior to the tongue tip. Methodological validation of the visibility and positioning of the pellet was determined from phantom measurements. Pellet movements during speech were found to define superior/inferior and anterior/posterior tongue movements. Our data suggest, however, that these movements do not always represent the point of maximum interest on the tongue surface. Measurements made during swallowing indicate that for both single swallows (20 cc H2O) and continuous swallows pellet movement over time contains transverse and longitudinal wave components. Greater tongue excursion occurred during continuous swallowing. The advantages and limitations of using a pellet will be discussed. Future applications will be mentioned.
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