Methods Video-stroboscopy was used to reveal the laryngeal cavity and dynamic changes of the vocal fold, and sound spectrograph was used to examine audio frequency, pitch and width.

• 方法用频闪喉镜显示患者喉腔全貌和声带的动态变化，用声门分析仪检测并记录患者发声的频率、音调和音域。