Evaluation of swallowing movement using ultrasonography

The aim of this study is to develop an index to assess swallowing function by ultrasonography in order to evaluate the relationship between movements of the hyoid bone and the larynx while swallowing water. Forty-two younger participants (mean age, 20.3 ± 3.4 years) and 42 older participants (mean age, 75.1 ± 10.6 years) with normal swallowing function were included in the study. Movements of the hyoid bone and the larynx while swallowing 5 mL of water were observed using ultrasonography. Two-dimensional distances from the starting points of the hyoid bone and the larynx to their points of maximum movement were measured as displacements. The hyoid bone–laryngeal motion ratio was defined as the hyoid bone displacement divided by the laryngeal displacement. Parameters were compared among four groups: younger male, younger female, older male, and older female. The hyoid bone displacement differed significantly between the younger and older groups, and the laryngeal displacement differed significantly between age groups and sexes. The hyoid bone–laryngeal motion ratio was not significantly correlated with age, height, or body weight, and did not show a significant difference between the four groups. Thus, the hyoid bone–laryngeal motion ratio is an index that evaluates swallowing movement and is independent of physique and physiological changes associated with aging.

内容要旨・審査要旨・論文本文の公開
本論文は，著者Takao Matsuoの学位論文として提出され，学位審査・授与の対象となっている。
著者の申請により要約(2020-04-09公開)に替えて論文全文を公開(2021-03-16)
This is a post-peer-review, pre-copyedit version of an article published in Radiological Physics and Technology.
The final authenticated version is available online at: https://doi.org/10.1007/s12194-019-00547-1

© Japanese Society of Radiological Technology and Japan Society of Medical Physics 2019