Measurement of Glottal Cycle Characteristics Between Children and Adults: Physiological Variations

Patel, Rita R.; Dubrovskiy, Denis; Döllinger, Michael

doi:10.1016/j.jvoice.2013.12.010

Cited by 48 publications

(43 citation statements)

References 40 publications

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“…These values are similar to those of 0.59 ± 0.05 [41] and 0.52 ± 0.06 [21] obtained using 4 kfps. The changes in ASQ seem to be minor, with a maximum of 0.60 at 1 kfps, even though the differences are statistically significant.…”

Section: Discussionsupporting

confidence: 88%

“…This CQ value is also below computed values for solely male groups presented previously: 0.40 ± 0.09 [46] and 0.38 ± 0.11 [41]. …”

Section: Discussioncontrasting

confidence: 71%

“…However, it seems that MADR stabilizes at 13 kfps and above; that is, the values remain in the range –530–(–557). Patel et al (2014) [41] also used a 70° endoscope and computed similar MADR values of–1011 ± 290 at a comparable recording rate of 4 kfps (here –1096 ± 150). The lower value of –628 ± 186 reported by Bohr et al (2013) [21] at the same HSV recording rate of 4 kfps may be explained by the lower spatial resolution and that they used a 90° endoscope.…”

Section: Discussionmentioning

confidence: 73%

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Laryngeal High-Speed Videoendoscopy: Sensitivity of Objective Parameters towards Recording Frame Rate

Schützenberger

Döllinger

Dubrovskiy

et al. 2016

BioMed Research International

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The current use of laryngeal high-speed videoendoscopy in clinic settings involves subjective visual assessment of vocal fold vibratory characteristics. However, objective quantification of vocal fold vibrations for evidence-based diagnosis and therapy is desired, and objective parameters assessing laryngeal dynamics have therefore been suggested. This study investigated the sensitivity of the objective parameters and their dependence on recording frame rate. A total of 300 endoscopic high-speed videos with recording frame rates between 1000 and 15 000 fps were analyzed for a vocally healthy female subject during sustained phonation. Twenty parameters, representing laryngeal dynamics, were computed. Four different parameter characteristics were found: parameters showing no change with increasing frame rate; parameters changing up to a certain frame rate, but then remaining constant; parameters remaining constant within a particular range of recording frame rates; and parameters changing with nearly every frame rate. The results suggest that (1) parameter values are influenced by recording frame rates and different parameters have varying sensitivities to recording frame rate; (2) normative values should be determined based on recording frame rates; and (3) the typically used recording frame rate of 4000 fps seems to be too low to distinguish accurately certain characteristics of the human phonation process in detail.

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Section: Discussionsupporting

confidence: 88%

“…This CQ value is also below computed values for solely male groups presented previously: 0.40 ± 0.09 [46] and 0.38 ± 0.11 [41]. …”

Section: Discussioncontrasting

confidence: 71%

Section: Discussionmentioning

confidence: 73%

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Laryngeal High-Speed Videoendoscopy: Sensitivity of Objective Parameters towards Recording Frame Rate

Schützenberger

Döllinger

Dubrovskiy

et al. 2016

BioMed Research International

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“…20 With prior evidence that adductor group stimulation increases vocal fold tension of the body layer, 21 the utilization of physiologically viable larynges is critical towards the study of phonatory OQ. With the use of the ex-vivo perfused larynx, the data presented here suggests that an increase in adductor group stimulation does in fact lead to direct modulation of the OQ.…”

Section: Discussionmentioning

confidence: 99%

Preliminary Study of the Open Quotient in an Ex Vivo Perfused Human Larynx

Mendelsohn

Zhang

Luegmair

et al. 2015

JAMA Otolaryngol Head Neck Surg

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Importance Scientific understanding human voice production to date is a product of indirect investigations including animal models, cadaveric tissue study, or computational modeling. Due to its invasive nature, direct experimentation of human voice production has previously not been possible. The feasibility of an ex-vivo perfused human phonatory model has recently allowed systematic investigation in virtually living human larynges with parametric laryngeal muscle stimulation. Objective In this study, the relationship between adductor muscle group stimulation and the open quotient (OQ) of vocal fold vibration was investigated using an ex-vivo perfused human larynx. Design Human perfused tissue study. Setting Physiology Laboratory. Participants Human larynx is recovered from research-consented organ donors within two hours of cardiac death. Interventions, Main Outcomes and Measures Perfusion with donated human blood is re-established shortly after cardiac death. Human perfused phonation is achieved by providing subglottal airflow under graded neuromuscular electrical stimulation bilaterally to the intrinsic adductor groups and cricothyroid muscles. The phonation resulting from the graded states of neuromuscular stimulations are evaluated through high-speed vibratory imaging. OQ is derived through digital kymography and glottal area waveform analysis. Results Under constant glottal flow, step-wise increase in adductor muscle group stimulation decreased OQ. Quantitatively, OQ values reached a lower limit of 0.42. Increased stimulation above maximal muscle deformation was unable to affect OQ beyond this lower limit. Conclusions and Relevance For the first time in a neuromuscularly activated human larynx, a negative relationship between adductor muscle group stimulation and phonatory OQ was demonstrated. Further experience with the ex-vivo perfused human phonatory model will work to systematically define this causal relationship.

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“…Typical vocal fold vibrations display a frequency in the range of 80-300 Hz for normal phonation. In order to capture such rapid movements adequately, high-speed videoendoscopy (HSV) with frame rates in the range of 4-20 kHz is used [3][4][5][6][7]. In the clinical routine, the most common methods for an evaluation of the vocal fold physiology and dynamical behavior are based on endoscopic, two-dimensional imaging (see Figure 1, left).…”

Section: Introductionmentioning

confidence: 99%

Endoscopic Laser-Based 3D Imaging for Functional Voice Diagnostics

et al. 2017

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Recently, we reported on the in vivo application of a miniaturized measuring device for 3D visualization of the superior vocal fold vibrations from high-speed recordings in combination with a laser projection unit (LPU). As a long-term vision for this proof of principle, we strive to integrate the further developed laserendoscopy as a diagnostic method in daily clinical routine. The new LPU mainly comprises a Nd:YAG laser source (532 nm/CW/2ω) and a diffractive optical element (DOE) generating a regular laser grid (31 × 31 laser points) that is projected on the vocal folds. By means of stereo triangulation, the 3D coordinates of the laser points are reconstructed from the endoscopic high-speed footage. The new design of the laserendoscope constitutes a compromise between robust image processing and laser safety regulations. The algorithms for calibration and analysis are now optimized with respect to their overall duration and the number of required interactions, which is objectively assessed using binary classifiers. The sensitivity and specificity of the calibration procedure are increased by 40.1% and 22.3%, which is statistically significant. The overall duration for the laser point detection is reduced by 41.9%. The suggested semi-automatic reconstruction software represents an important stepping-stone towards potential real time processing and a comprehensive, objective diagnostic tool of evidence-based medicine.

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Measurement of Glottal Cycle Characteristics Between Children and Adults: Physiological Variations

Cited by 48 publications

References 40 publications

Laryngeal High-Speed Videoendoscopy: Sensitivity of Objective Parameters towards Recording Frame Rate

Laryngeal High-Speed Videoendoscopy: Sensitivity of Objective Parameters towards Recording Frame Rate

Preliminary Study of the Open Quotient in an Ex Vivo Perfused Human Larynx

Endoscopic Laser-Based 3D Imaging for Functional Voice Diagnostics

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