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Videokymography
Videokymography is a high-speed medical imaging method to visualize the human vocal fold vibration dynamics. It was invented by Jan G. Švec.〔Svec, J., and Schutte, H. (1996). "Videokymography: High-speed line scanning of vocal fold vibration," Journal of Voice 10, 201-205.〕
A digital technique for high-speed visualization of vibration, called videokymography, was developed and applied to the vocal folds. The system uses a modified video camera able to work in two modes: high-speed (nearly 8,000 images/s) and standard (50 images/s in CCIR norm). In the high-speed mode, the camera selects one active horizontal line (transverse to the glottis) from the whole laryngeal image. The successive line images are presented in real time on a commercial TV monitor, filling each video frame from top to bottom. The system makes it possible to observe left-right asymmetries, open quotient, propagation of mucosal waves, movement of the upper and, in the closing phase, the lower margins of the vocal folds, etc. The technique is suitable for further processing and quantification of recorded vibration.
==History==
Videokymography was developed in 1994 by Czech and Dutch scientists, Jan G. Švec and Harm K. Schutte, as a low-cost, high-speed imaging method for examination of vocal fold vibrations. After being developed in the Netherlands, it was introduced to clinical practices in Prague where it now complements another visualization method known as videostroboscopy for early diagnostics of voice disorders and therapy evaluation at the Center for Communication Disorders, Medical Healthcom. Since then, videokymography has spread as a clinical and research tool to clinics around the world, and kymographic display was adopted also for digital high-speed endoscopy.〔“Voice Research and Treatment in the Czech Republic”, n.d. http://www.asha.org/Publications/leader/2006/060502/f060502a5.htm.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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