Schutte H K, Svec J G, Sram F
Groningen Voice Research Lab, Biomedical Technology, Faculty of Medical Sciences, University of Groningen, The Netherlands.
Laryngoscope. 1998 Aug;108(8 Pt 1):1206-10. doi: 10.1097/00005537-199808000-00020.
Stroboscopy is based on the assumption that the vibration of the vocal folds is stable and regular. Irregular vibrations, which are common in voice pathology, cannot easily be studied and described in a reliable way. Videokymography overcomes most of these drawbacks.
The use of the recently invented videokymography for studying vocal fold vibrations in patients is introduced.
Videokymography, using a modified CCD-video camera, works in two modes: standard and high speed. In standard mode the vocal folds are displayed on a video monitor in the usual way, providing 50 images per second (or 60 in the National Television Standards Committee (NTSC) system). This is used for routine laryngoscopic and stroboscopic examination of the larynx. In high-speed mode (nearly 8000 images per second) only one line from the whole image is selected and displayed on the x-axis of the monitor; the y-axis represents the time dimension.
All kinds of vocal fold vibrations, including those leading to pathological rough, breathy, hoarse, or diplophonic voice productions can be observed. Videokymography visualizes small left-right asymmetries, open quotient differences along the glottis, lateral propagation of mucosal waves, and movements of the upper margin and, sometimes in the closing phase, the lower margin of the vocal folds.
Videokymography is advantageous for a more accurate diagnosis of voice disorders. Videokymography provides a simple way to study irregular vibrations of the vocal folds. Information is directly available for further processing and allows a first-time quantification of vibrations registered.
频闪喉镜检查基于这样一种假设，即声带的振动是稳定且规则的。不规则振动在嗓音病理学中很常见，但难以用可靠的方式进行研究和描述。动态喉镜检查克服了这些缺点中的大部分。
介绍了最近发明的动态喉镜检查在研究患者声带振动方面的应用。
使用改良的电荷耦合器件（CCD）摄像机的动态喉镜检查有两种工作模式：标准模式和高速模式。在标准模式下，声带以常规方式显示在视频监视器上，每秒提供50帧图像（在国家电视标准委员会（NTSC）系统中为每秒60帧）。这用于喉部的常规喉镜检查和频闪喉镜检查。在高速模式下（每秒近8000帧图像），仅从整个图像中选择一条线并显示在监视器的x轴上；y轴代表时间维度。
可以观察到各种声带振动，包括那些导致病理性粗糙、呼吸声、嘶哑或双音嗓音产生的振动。动态喉镜检查可显示微小的左右不对称、声门处的开放商差异、黏膜波的侧向传播以及声带前缘的运动，有时在闭合阶段还可显示声带后缘的运动。
动态喉镜检查有利于更准确地诊断嗓音障碍。动态喉镜检查提供了一种研究声带不规则振动的简单方法。信息可直接用于进一步处理，并允许对记录的振动进行首次量化。
