SONOSIM SUMMARY: While CT and MRI are commonly used to evaluate the laryngeal tract, this study utilizes US to characterize images of laryngeal tract physiological motion and to track symmetry during neck abduction and adduction. Observations using ultrasound were used for evaluating the true vocal fold motion. Characterizations were then made based by selecting three clearly defined landmarks created by the anterior insertion landmark and the left and right arytenoid cartilage. Proper orientation and image selection of these landmarks allowed for accurate determination of mobility, which are helpful for the diagnosis of recurrent nerve paralysis. Further research is needed for characterization of the pathology diagnosis for laryngeal anatomy and arytenoid movement.
Bergeret‐Cassagne H, Lazard D, Lefort M, et al. Sonographic dynamic description of the laryngeal tract: definition of quantitative measures to characterize vocal fold motion and estimation of their normal values. J Ultrasound Med. 2017 May;36(5):1037-1044.
Vocal fold motion was analyzed during free breathing using two-dimensional dynamic ultrasound imaging. Two cadavers were first analyzed to define easily identifiable landmarks. Motion of the laryngeal tract was then analyzed in an axial plane. Left and right arytenoids and thyroid cartilage were defined on images corresponding to abduction and adduction of the laryngeal tract. Associated area measurements were established for 50 healthy subjects. All area indices were significantly larger during abduction than adduction. Symmetry of motion was established by comparing each hemi-larynx, and mobility fractions were defined. Normal values of laryngeal motion during free breathing were thus established.
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SonoSim Keywords: Ultrasound Education, Ultrasound Training, Point-of-Care Ultrasonography