Summary
Objective
The objective of this study was to quantitatively measure the three-dimensional (3D)
structure of the vocal folds in normal subjects and in patients with different types
of cricoarytenoid dislocation. We will analyze differences in parameters between the
groups and also determine if any morphologic parameters possess utility in distinguishing
the type and the degree of cricoarytenoid dislocation.
Study Design
This retrospective study was conducted using university hospital data.
Methods
Subjects' larynges were scanned using dual-source computed tomography (CT). The normal
subjects were divided into deep-inhalation and phonation groups, and patients with
cricoarytenoid joint dislocation were divided into anterior-dislocation and posterior-dislocation
groups. Membranous vocal fold length and width were measured directly on the thin-section
CT images. Vocal fold and airway 3D models were constructed using Mimics software and used in combination to measure vocal fold thickness, subglottal convergence
angle, and oblique angle of the vocal folds.
Results
The phonation group displayed a greater vocal fold width, greater oblique angle, thinner
vocal folds, and a smaller subglottal convergence angle than those of the deep-inhalation
group (P < 0.05). The anterior-dislocation group displayed a smaller oblique angle and subglottal
convergence angle than the posterior-dislocation group (P < 0.05).
Conclusions
The 3D structure of the vocal folds during deep inhalation and phonation can be accurately
measured using dual-source CT and laryngeal 3D reconstruction. As the anterior-dislocation
group yielded negative values for the oblique angle and the posterior-dislocation
group yielded positive values, the oblique angle of the vocal folds may possess utility
for distinguishing the type and for quantitatively determining the degree of cricoarytenoid
dislocation.
Key Words
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Article info
Publication history
Published online: August 23, 2018
Accepted:
February 28,
2018
Footnotes
Disclosure: This study was supported by the National Natural Science Foundation of China, item number 81371080.
Identification
Copyright
© 2018 The Voice Foundation. Published by Elsevier Inc. All rights reserved.
