Slow motion video gallery recorded using high-speed camera ALI Cam-HS1 and illuminator ALI Lum-MF1 or ALI Lum-C1
In the assessment of pathologies associated with the function of vocal folds, it is necessary to analyze the slow-motion sequence showing their function during phonation. For this purpose, videostroboscopy or high-speed imaging is used.
Performing a proper recording using videostroboscope requires some practice from the user. Even an experienced user is unable to avoid the limitations of this technology. Slow-motion recording using stroboscopic technique requires maintaining a proper synchronization of the flashes of light or moments of collecting subsequent film frames with the vibrations of the vocal folds. For this purpose, a long stable phonation is needed, which is not always possible to achieve. When the phonation is too short, or when the vocal folds vibrate irregularly (due to an existing pathology), the stroboscope is unable to maintain the synchronization, and thus it is not possible to obtain an appropriate video record for further analysis. Unfortunately, the stroboscopic technique fails in cases where accurate imaging of vocal folds is particularly needed. The high-speed video technique realized with high-speed cameras is free of these limitations, giving a reliable result in any case, even in the case of large pathologies.
Below we present some videos recorded using a videostroboscope and our high-speed camera ALI Cam-HS1
Vocal folds paralysis based on previous studies
Slow motion videos recorded using high-speed camera ALI Cam-HS1 and illuminator ALI Lum-MF1 or ALI Lum-C1 showing the nuances of vocal folds function for healthy people and people with various pathologies.
In addition to detailed imaging of vocal folds in High-Speed mode, the camera ALI Cam-HS1 provides a high definition (HD) mode for general imaging of the entire larynx and diagnostics of organic changes - below we present videos recorded in this mode with standard light and green light only.
Some videos courtesy of prof. Ewa Niebudek-Bogusz MD PhD – Professor at the Clinic of Audiology and Phoniatrics, Nofer Institute of Occupational Medicine.
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