Department of Head and Neck Surgery, University of California, Los Angeles, California.
Department of Head and Neck Surgery, University of California, Los Angeles, California.
J Voice. 2023 Jul;37(4):633.e15-633.e23. doi: 10.1016/j.jvoice.2021.02.021. Epub 2021 Mar 19.
While the vocal fold is in direct contact anteriorly with the thyroid cartilage, posteriorly the vocal fold connects to the thyroid cartilage through a soft tissue layer in the paraglottic space. Currently the paraglottic space is often neglected in computational models of phonation, in which a fixed boundary condition is often imposed on the lateral surface of the vocal fold. The goal of this study was to investigate the effect of the paraglottic space on voice production in an MRI-based vocal fold model, and how this effect may be counteracted by vocal fold stiffening due to laryngeal muscle activation.
Parametric simulation study using an MRI-based computational vocal fold model.
The results showed that the presence of the paraglottic space increased the mean and amplitude of the glottal area waveform, decreased the phonation frequency and closed quotient. For the particular vocal fold geometry used in this study, the presence of the paraglottic space also reduced the occurrence of irregular vocal fold vibration. These effects of the paraglottic space became smaller with increasing paraglottic space stiffness and to a lesser degree with vocal fold stiffening.
The results suggest that the paraglottic space may be neglected in qualitative evaluations of normal phonation, but needs to be included in simulations of pathological phonation or vocal fold posturing.
虽然声带的前侧直接与甲状软骨接触，但声带的后侧通过声门旁间隙中的软组织层与甲状软骨相连。目前，声门旁间隙在发声的计算模型中经常被忽略，在这些模型中，通常对声带的侧面施加固定边界条件。本研究的目的是研究声门旁间隙对基于 MRI 的声带模型发声的影响，以及喉肌激活导致声带变硬如何抵消这种影响。
使用基于 MRI 的计算性声带模型进行参数模拟研究。
结果表明，声门旁间隙的存在增加了声门区面积波形的平均值和幅度，降低了发声频率和闭合商。对于本研究中使用的特定声带几何形状，声门旁间隙的存在还减少了声带不规则振动的发生。随着声门旁间隙刚度的增加，这些声门旁间隙的影响变小，而随着声带变硬的程度减小。
结果表明，在正常发声的定性评估中可以忽略声门旁间隙，但在病理发声或声带姿势的模拟中需要包括声门旁间隙。
