Summary
Author: MSc Anna Racino, Ph.D. Marcin Just, Ph.D. Michał Tyc (DiagNova Technologies)Date: 2019.07.01
The basic differences between the techniques of high-speed video and stroboscopy are presented in table 1. It includes the column "high-speed video in the past" - referring to high-speed cameras available on the market so far, and "high-speed video now" - referring to the high-speed ALI Cam camera from DiagNova .
The main features of stroboscopy that contributed to its dissemination were the low cost and ease of testing compared to early versions of the high-speed camera. The price difference has faded significantly, especially with the higher quality stroboscope sets. In particular, strobe sets offering HD image are currently even more expensive than the set with a fast camera offered on the Polish market, and it also offers HD image in general visualization mode.The high-speed camera examination is now easier and faster to perform than the strobe examination. The only limitation is that a fiberscope cannot be used in this case.
- the ability to diagnose pathological conditions with the occurrence of irregularities in vibrations,
- credibility of the examination - no risk of distorting the result, which often happens when diagnosing pathology with a stroboscope,
- much faster and possible for each case making kymographic sections, which enable faster and more reliable diagnostics and reliable documentation for the purposes of, for example, occupational medicine,
- the possibility of analyzing the non-uniformity of phonation vibrations on the basis of a large number of cycles of work of the vocal folds;
The main features of high-speed camera diagnostics are:
These features predestine the high-speed camera examination to act as the main examination at the clinical or rehabilitation level. In turn, stroboscopic examination should evolve towards screening performed in order to qualify for more accurate diagnostics with the use of high-speed camera.
Table. 1. Comparison of the high-speed video technique and stroboscopy
| Stroboscopy | High-speed video in the past | High-speed video now | ||
|---|---|---|---|---|
| Documentation and archiving of the examination | / difficult processing, limitations of the recording length |
|||
| Overall assessment of laryngeal morphology | / (HD mode) |
|||
| Low cost | / similar to strobo HD |
|||
| Easy to do the examination | / | |||
| Comfort of examination | ||||
| Advanced analysis | / for selected cases, strobokymography |
|||
| No need to sync with your voice | ||||
| No risk of obtaining a false image of the work of the vocal folds | ||||
| Very short phonations can be registered | ||||
| Possibility of recording beginnings and ends of phonation | ||||
| Possibility to evaluate high singing voices | / vibrato makes it difficult to obtain the correct strobe effect |
/ difficulty registering voices above 400 Hz |
/ difficulty registering voices above 400 Hz |
|
| Assessment of laryngeal function for regular vibrations | Symmetry | |||
| Amplitude | ||||
| Vibration frequency | ||||
| Mucosal wave | ||||
| Regurgitation | ||||
| Opening rate | ||||
| Assessment of the cyclicity of vibrations | not enough periods |
|||
| Assessment of laryngeal function for irregular vibrations | Symmetry | |||
| Amplitude | / partly |
|||
| Vibration frequency | ||||
| Mucosal wave | ||||
| Regurgitation | ||||
| Irregularity assessment | ||||
| Pseudo-glotis work assessment | ||||