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[High speed glottographic diagnostics in laryngology]
1Poliklinik für Hör-, Stimm- und Sprachheilkunde, Universitätsklinikum Hamburg-Eppendorf. g.schade@uke.uni-hamburg.de
HNO
|June 14, 2005
Summary
High-speed imaging (HSI) of vocal folds visualizes aperiodic movements, offering new diagnostic possibilities in laryngology. Despite data transfer challenges and lower image quality, HSI is a promising advancement.
Area of Science:
- Laryngology
- Medical Imaging
- Biomedical Engineering
Background:
- High-speed imaging (HSI) technology, developed in 1939, has recently become clinically viable due to advancements in data handling capacity.
- HSI enables capturing thousands of images per second of vibrating vocal folds, surpassing previous limitations.
Purpose of the Study:
- To evaluate the clinical utility and diagnostic capabilities of high-speed imaging for vocal fold analysis.
- To compare HSI with established methods like videoendoscopy and videostroboscopy.
Main Methods:
- Utilized rigid endoscopes and the Wolf HS Endocam 5560 for high-speed glottography.
- Acquired up to 8,000 grayscale images (256x256 pixels) at speeds up to 4,000 images/second.
- Performed off-line kymographic analysis after clinical investigation.
Main Results:
- HSI allows detailed analysis of individual vocal fold movements within the vibratory cycle.
- Enabled visualization of aperiodic vocal fold movements, which are not apparent with stroboscopic methods.
- Recording durations ranged from 2 to 4 seconds, with data transfer taking several minutes.
Conclusions:
- High-speed imaging offers a significant advantage in visualizing aperiodic vocal fold dynamics.
- Disadvantages include longer data transfer times and reduced image quality compared to conventional videoendoscopy.
- Despite limitations, HSI represents a highly promising technique for laryngological investigations.