The laryngeal measures.Annotated CT image at the level of the glottis depicting the laryngeal measures used in this study. Fiducial markers (shown as yellow crosshairs) are placed at the most medial aspect of the arytenoid cartilages (Ar). The inter-arytenoid distance (IAD) is defined as the Euclidean distance between them, as depicted by the arrow. The arytenoid velocity (av→) is equivalent to the change in IAD between successive timepoints (not illustrated). The glottic area (GA) is the segmented area of air density at the level of the vocal folds. Also shown are the thyroid cartilage (Th) and cricoid cartilage (Cr).