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Videokymography System, Model 8900 (Kayelemetrics, 2005) What is Videokymography? • VKG (videokymography) is a modified video camera that is coupled to a standard rigid endoscope and a constant light source. • It is able to capture high-speed motion such as, vocal fold vibration. Where was VKG developed? Was VKG ever tested? • VKG was developed at the university of Groningen in the Netherlands by Dr. Harm Schutte and Dr. Jan Svec. • VKG was clinically tested by Dr. Frantisek Sram from the Center for Communication Disorders in Prague on hundreds of patients. What important properties can VKG capture specifically? Videokymographic images can reflect… -open and close phases of the glottal cycle. -opening and closing movements. -propagation of mucosal waves -displacements of the upper and lower vocal fold margins. There are two modes of the VKG camera.. The standard mode displays a black-and- white video image for proper orientation. The high-speed mode selects a single line from the standard image and displays it 8000 times per second. Some things you should know… • VKG is the ideal complement to stroboscopy given its unique capabilities. • Although VKG is not as intuitive as stroboscopy, it allows direct viewing of vocal fold behaviors, which may not be observable with a stroboscopic image. For example… • VKG allows the direct observation of vocal fold motion, even if the motion is aperiodic. • Consequently, diplophonia, voicing initiation, vocal fry, creaky voice, biphonia and aperiodicity can be viewed directly. Videokymography fills a key role in broadening the comprehension of phonatory dynamics!
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