Influence of Analyzed Sequence Length on Parameters in Laryngeal High-Speed Videoendoscopy
Laryngeal high-speed videoendoscopy (HSV) allows objective quantification of vocal fold vibratory characteristics. However, it is unknown how the analyzed sequence length affects some of the computed parameters. To examine if varying sequence lengths influence parameter calculation, 20 HSV recording...
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doaj-6051cfcbcdc24ba0ab62e8d8b1711a842020-11-24T23:41:10ZengMDPI AGApplied Sciences2076-34172018-12-01812266610.3390/app8122666app8122666Influence of Analyzed Sequence Length on Parameters in Laryngeal High-Speed VideoendoscopyPatrick Schlegel0Marion Semmler1Melda Kunduk2Michael Döllinger3Christopher Bohr4Anne Schützenberger5Department of Otorhinolaryngology, Division of Phoniatrics and Pediatric Audiology, University Hospital Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg, 91054 Erlangen, GermanyDepartment of Otorhinolaryngology, Division of Phoniatrics and Pediatric Audiology, University Hospital Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg, 91054 Erlangen, GermanyDepartment of Communication Sciences and Disorders, Louisiana State University, Baton Rouge, LA 70803, USADepartment of Otorhinolaryngology, Division of Phoniatrics and Pediatric Audiology, University Hospital Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg, 91054 Erlangen, GermanyDepartment of Otorhinolaryngology, University Hospital Regensburg, 93053 Regensburg, GermanyDepartment of Otorhinolaryngology, Division of Phoniatrics and Pediatric Audiology, University Hospital Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg, 91054 Erlangen, GermanyLaryngeal high-speed videoendoscopy (HSV) allows objective quantification of vocal fold vibratory characteristics. However, it is unknown how the analyzed sequence length affects some of the computed parameters. To examine if varying sequence lengths influence parameter calculation, 20 HSV recordings of healthy females during sustained phonation were investigated. The clinical prevalent Photron Fastcam MC2 camera with a frame rate of 4000 fps and a spatial resolution of 512 × 256 pixels was used to collect HSV data. The glottal area waveform (GAW), describing the increase and decrease of the area between the vocal folds during phonation, was extracted. Based on the GAW, 16 perturbation parameters were computed for sequences of 5, 10, 20, 50 and 100 consecutive cycles. Statistical analysis was performed using SPSS Statistics, version 21. Only three parameters (18.8%) were statistically significantly influenced by changing sequence lengths. Of these parameters, one changed until 10 cycles were reached, one until 20 cycles were reached and one, namely <i>Amplitude Variability Index</i> (<i>AVI</i>), changed between almost all groups of different sequence lengths. Moreover, visually observable, but not statistically significant, changes within parameters were observed. These changes were often most prominent between shorter sequence lengths. Hence, we suggest using a minimum sequence length of at least 20 cycles and discarding the parameter <i>AVI</i>.https://www.mdpi.com/2076-3417/8/12/2666high-speed videoendoscopyglottal area waveformsequence lengthparametersdiagnosis |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Patrick Schlegel Marion Semmler Melda Kunduk Michael Döllinger Christopher Bohr Anne Schützenberger |
spellingShingle |
Patrick Schlegel Marion Semmler Melda Kunduk Michael Döllinger Christopher Bohr Anne Schützenberger Influence of Analyzed Sequence Length on Parameters in Laryngeal High-Speed Videoendoscopy Applied Sciences high-speed videoendoscopy glottal area waveform sequence length parameters diagnosis |
author_facet |
Patrick Schlegel Marion Semmler Melda Kunduk Michael Döllinger Christopher Bohr Anne Schützenberger |
author_sort |
Patrick Schlegel |
title |
Influence of Analyzed Sequence Length on Parameters in Laryngeal High-Speed Videoendoscopy |
title_short |
Influence of Analyzed Sequence Length on Parameters in Laryngeal High-Speed Videoendoscopy |
title_full |
Influence of Analyzed Sequence Length on Parameters in Laryngeal High-Speed Videoendoscopy |
title_fullStr |
Influence of Analyzed Sequence Length on Parameters in Laryngeal High-Speed Videoendoscopy |
title_full_unstemmed |
Influence of Analyzed Sequence Length on Parameters in Laryngeal High-Speed Videoendoscopy |
title_sort |
influence of analyzed sequence length on parameters in laryngeal high-speed videoendoscopy |
publisher |
MDPI AG |
series |
Applied Sciences |
issn |
2076-3417 |
publishDate |
2018-12-01 |
description |
Laryngeal high-speed videoendoscopy (HSV) allows objective quantification of vocal fold vibratory characteristics. However, it is unknown how the analyzed sequence length affects some of the computed parameters. To examine if varying sequence lengths influence parameter calculation, 20 HSV recordings of healthy females during sustained phonation were investigated. The clinical prevalent Photron Fastcam MC2 camera with a frame rate of 4000 fps and a spatial resolution of 512 × 256 pixels was used to collect HSV data. The glottal area waveform (GAW), describing the increase and decrease of the area between the vocal folds during phonation, was extracted. Based on the GAW, 16 perturbation parameters were computed for sequences of 5, 10, 20, 50 and 100 consecutive cycles. Statistical analysis was performed using SPSS Statistics, version 21. Only three parameters (18.8%) were statistically significantly influenced by changing sequence lengths. Of these parameters, one changed until 10 cycles were reached, one until 20 cycles were reached and one, namely <i>Amplitude Variability Index</i> (<i>AVI</i>), changed between almost all groups of different sequence lengths. Moreover, visually observable, but not statistically significant, changes within parameters were observed. These changes were often most prominent between shorter sequence lengths. Hence, we suggest using a minimum sequence length of at least 20 cycles and discarding the parameter <i>AVI</i>. |
topic |
high-speed videoendoscopy glottal area waveform sequence length parameters diagnosis |
url |
https://www.mdpi.com/2076-3417/8/12/2666 |
work_keys_str_mv |
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1725507980854558720 |