do you doctor Thomas ever use a kymography video of vocal cords

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Because the vocal cords are vibrating in 100 of times per second, it will be interesting to see it, in very slow motion,so we will have a clearer "picture" what's going on, with trained voices, and untrained voices changing pitch. Beside the muscles that stretch the vocal cords for higher pitches. It is said that other coordination comes into play here. a coordination that one can produce by training with the "brett manning technique" and it feels that the vocal cords vibrating differently, and also feels not by their whole length. So a vidao that captures 1000 frames per second, can bring to light what's going on....

James P Thomas MD's picture
Submitted by James P Thomas MD on Tue, 2012-09-11 11:39

There are pluses and minuses to each type of technique that analyzes the vocal cords. I use stroboscopy. There are diagnosticians who utilize high-speed video and there are others who use kymography. Each of these three tools are excellent if you become used to their benefits and their limitations.

For example, stroboscopy is not capturing true motion but the examination can be reviewed very quickly and the vocal cords can be looked at at various pitches and various volumes rather quickly. High-speed video captures a few moments of vocal cord motion very rapidly but then takes a fair amount of time to review. If you capture 1000 frames a second but watch the video at 30 frames a second then time greatly expands. The examiner has to plan ahead and only capture some essential period of time. Kymography looks at only a single segment of the vocal cord so the examiner has to know where along the length of the vocal cord they wish to look before filming. There are some displays that can show both stroboscopy and kymography simultaneously to help orient the examiner.

In the end, if the examiner understands his tool, the tool can be used well.