Flaherty R F, Seltzer S, Campbell T, Weisskoff R M, Gilbert R J
Department of Medicine, St Elizabeth's Medical Center, Boston, Massachusetts, USA.
Gastroenterology. 1995 Sep;109(3):843-9. doi: 10.1016/0016-5085(95)90393-3.
BACKGROUND & AIMS: Vocal cord closure is instrumental in airway protection during deglutition. Conventional imaging of vocal cord closure and reopening during deglutition requires invasive and nonphysiological methods. The aim of this study was to characterize the biomechanical properties of normal vocal cord adduction/abduction during deglutition using echoplanar magnetic resonance imaging, a technique that has the capability of imaging soft-tissue motion with real-time temporal resolution.
The movements of laryngeal and vocal cord structures during swallowing were determined in 11 normal volunteers by single slice and axially reformatted multislice coronal echoplanar images.
During swallowing, the larynx ascended to peak elevation, maintained peak elevation for a discrete interval, and descended to its resting position. Vocal cord adduction occurred with a symmetric tent-like configuration at the midpoint of maximal laryngeal elevation, whereas vocal cord abduction occurred at the midpoint of laryngeal descent. Spatial analysis of vocal cord configuration during adduction determined that the vocal cords attained an initial parallel configuration during ascent, followed by closure at peak laryngeal elevation.
These results show that the vocal cords adduct and abduct synchronously with laryngeal ascent and descent, respectively, during deglutition. Echoplanar magnetic resonance imaging constitutes a novel tool used to assess clinical abnormalities of deglutitive laryngeal function.
吞咽过程中声带闭合对气道保护至关重要。传统成像吞咽过程中声带闭合与重新开放需要侵入性且非生理性的方法。本研究的目的是使用回波平面磁共振成像来描述吞咽过程中正常声带内收/外展的生物力学特性，该技术能够以实时时间分辨率对软组织运动进行成像。
通过单层面和轴向重新格式化的多层冠状回波平面图像，在11名正常志愿者中确定吞咽过程中喉和声带结构的运动。
吞咽期间，喉部上升至峰值高度，在一个离散间隔内保持峰值高度，然后下降至其静止位置。声带内收在喉部最大上升的中点处以对称的帐篷状构型发生，而声带外展在喉部下降的中点处发生。内收期间声带构型的空间分析确定，声带在上升过程中达到初始平行构型，随后在喉部峰值高度处闭合。
这些结果表明，吞咽过程中声带分别与喉部上升和下降同步内收和外展。回波平面磁共振成像构成了一种用于评估吞咽性喉功能临床异常的新工具。
