Voice and Speech

do you need diagnostic advise? 

needing assistance or guidance in the OR?


How do you inject the vocal folds? 

diagnosing & treating spasmodic dysphonia…

medialization trough lipofilling or laryngeal framework surgery...

other (non) invasive procedures...………………………..

Videostroboscopy of the vocal folds can be performed by means of placing a rigid endoscope on the tongue or by introducing a flexible endoscope through the nose. Most often the rigid endoscope offers a better and clearer view. The stroboscopic light source is triggered by a microphone signal and enlightens the glottal cycle with a small delay (figure 1). As such the videostroboscopy offers a slow motion of the glottal vibration pattern.



Figure 1: green line: glottal vibration; arrows: light pulses of the stroboscopic light source; dashed blue line and continuous blue line: the virtual image the examiner gets to see (= slow motion)

Videokymography is a high tech procedure, performed in a similar way as videostroboscopy, by means of a rigid endoscope through the mouth or a flexible endoscope through the nose. However, the images are captured with a high speed camera, which can provide up to 8000 images per second. As the vocal folds vibrate with a frequency of +/- 120 Hz in males and +/-200 Hz in females, the glottal vibration is viewed in real time. The big advantage of this examination procedure is an exact representation of each cycle and  a better view of 1) eventual glottal closure defects, 2) eventual asymmetry in the wave pattern and/or wave amplitude, 3) the vocal onset and offset.