The Potential Role of Subglottal Convergence Angle and Measurement

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• 作者：Xinlin Xu^* ; Jingan Wang^&dagger ; ; Erin E. Devine^&Dagger ; ; Yong Wang^&dagger ; ; Hua Zhong^&dagger ; ; Maxwell R. Courtright^&Dagger ; ; Li Zhou^* ; PeiYun Zhuang^* ; ^{peiyun_zhuang@yahoo.com} ; Jack J. Jiang^&Dagger ; ; ^§ ;
• 关键词：vocal fold ; 3D model ; oblique section ; subglottal convergence angle ; incomplete glottal closure
• 刊名：Journal of Voice
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：31
• 期：1
• 页码：116.e1-116.e5
• 全文大小：857 K
• 卷排序：31

文摘

This study aimed to explore subglottal convergence angle measurement. We hypothesize that the angle will change with glottis closure condition. Changes to the angle may alter vocal fold stress distribution, which could result in vocal fold pathologies.MethodsThree vocal fold positions were evaluated by the degree of glottal closure and divided into three groups. Neck computed tomographic images of the subjects were gathered, and three-dimensional (3D) models of the vocal folds and the airway were reconstructed using Mimics software, through which the subglottal convergence angle was measured. Using one-way factor analysis of variance, we compared the angle among three groups. We explored the effect of the angle on vibration based on the material oblique section stress analysis.ResultsThe subglottal convergence angle was effectively measured from 3D models. The angle changed with degree of glottal closure, with statistically significant differences among the three groups (P < 0.01). Changes to the angle alter subglottal stress distribution in the subglottal shear or normal direction by the material oblique section stress analysis theory. Larger subglottal convergence angle might reduce subglottal pressure in the shear direction below the vocal folds, which would make vibration and vocal fold mucosal wave generation more difficult.Conclusion3D model generation from computed tomographic data is an effective method of measuring the subglottal convergence angle, which changes with the degree of glottis closure, and may affect subglottal pressure distribution in the subglottal shear or normal direction and influence vocal fold vibration.