Abstract
The introduction of the video system is an innovative enhancement to the clinical application of stroboscopy. However, the performance of videostroboscopy is limited to some degree. The NTSC format video system can divide laryngeal movement into 30 frames or 60 fields per second and its maximum resolution is 640 by 480 pixels (picture element). Although this performance is generally sufficient for clinical applications, it has problems with finer observation of laryngeal lesions and lack of brightness occuring during observation of low tone phonation. Clinical application of videostroboscopy is useful but attention should be paid to problems caused by video format.
