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Videokymography System_ Model 8900


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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
• 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
What important properties can VKG
       capture specifically?
Videokymographic images can reflect…
  -open and close phases of the glottal
  -opening and closing movements.
  -propagation of mucosal waves
  -displacements of the upper and lower
    vocal fold margins.
 There are two
modes of the VKG
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
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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