A Preliminary Quantitative Comparison of Vibratory Amplitude Using Rigid and Flexible Stroboscopic Assessment
| Autor: | Soren Y. Lowell, Carly J. Hosbach-Cannon, Raymond H. Colton, Richard T. Kelley |
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| Rok vydání: | 2015 |
| Předmět: |
Adult
Male Time Factors Voice Quality Acoustics Magnification Vocal Cords Laryngoscopes Vibration Standard deviation Stroboscope Loudness 030507 speech-language pathology & audiology 03 medical and health sciences Speech and Hearing Young Adult 0302 clinical medicine Phonation Predictive Value of Tests Image Interpretation Computer-Assisted Humans Stroboscopy 030223 otorhinolaryngology Pliability Connected speech Mathematics Observer Variation Laryngoscopy Reproducibility of Results Intra-rater reliability Equipment Design LPN and LVN Biomechanical Phenomena Amplitude Otorhinolaryngology Female 0305 other medical science |
| Zdroj: | Journal of voice : official journal of the Voice Foundation. 30(4) |
| ISSN: | 1873-4588 |
| Popis: | Summary Study Objective The purpose of this study was to establish preliminary, quantitative data on amplitude of vibration during stroboscopic assessment in healthy speakers with normal voice characteristics. Amplitude of vocal fold vibration is a core physiological parameter used in diagnosing voice disorders, yet quantitative data are lacking to guide the determination of what constitutes normal vibratory amplitude. Methods/Study Design Eleven participants were assessed during sustained vowel production using rigid and flexible endoscopy with stroboscopy. Still images were extracted from digital recordings of a sustained /i/ produced at a comfortable pitch and loudness, with F 0 controlled so that levels were within ±15% of each participant's comfortable mean level as determined from connected speech. Glottal width (GW), true vocal fold (TVF) length, and TVF width were measured from still frames representing the maximum open phase of the vibratory cycle. To control for anatomic and magnification differences across participants, GW was normalized to TVF length. GW as a ratio of TVF width was also computed for comparison with prior studies. Results Mean values and standard deviations were computed for the normalized measures. Paired t tests showed no significant differences between rigid and flexible endoscopy methods. Interrater and intrarater reliability values for raw measurements were found to be high (0.89–0.99). Conclusions These preliminary quantitative data may be helpful in determining normality or abnormality of vocal fold vibration. Results indicate that quantified amplitude of vibration is similar between endoscopic methods, a clinically relevant finding for individuals performing and interpreting stroboscopic assessments. |
| Databáze: | OpenAIRE |
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