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Showing 1 to 20 of 34 for “"Vocal fold"”.
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Kinematic Modeling of Asymmetric Vocal Fold Vibration
Asymmetries of the vocal folds and vocal fold vibration are key features underlying unilateral vocal fold motion impairment (VFMI). The knowledge of what particular asymmetries contribute to breathy voice and which asymmetries must be eliminated to re-establish normal voice will be important to …
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The biomechanical properties of the human vocal fold.
… is a specialist tissue structure known as the vocal folds, which under muscular control captures energy within the airflow and transfers it to a dynamic phenomena, analogous to a static fluid wave, known as the mucosal wave. This mucosal wave causes the vocal folds to open and close …
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Vocal Fold Analysis From High Speed Videoendoscopic Data
… the limits of videostroboscopy in evaluating the vocal fold vibratory behavior by providing much higher frame rate. HSV enables the visualization of vocal fold vibratory pattern within an actual glottic cycle. This very detailed infor-mation on vocal fold vibratory characteristics could provide …
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TARGETING FIBROBLAST-MATRIX INTERACTIONS TO TREAT VOCAL FOLD SCARRING
… defined as poor voice, after laryngeal injury is vocal fold (VF) scarring, which typically follows upper airway trauma or iatrogenic injury. After initial VF damage, immune cells infiltrate the wound bed and secrete various cytokines, including transforming growth factor-β (TGF-β), to promote …
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Possible Influences of Vowel Tongue Position on Vocal Fold Stiffness
… was to examine the effect of tongue position on vocal fold stiffness. New aerodynamic measures were used to estimate vocal fold stiffness during sustained productions of the vowels [i], [^], and [a]. Those measures were acoustic oscillation damping time, acoustic oscillation threshold pressure, …
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Characterization of the vocal fold lamina propria towards voice restoration
During normal speech, human vocal folds sustain greater than 100 high impact collisions each second. When the pliability of this complex biomechanical system is reduced by scarring, voice quality may be compromised. Currently, little can be done to treat patients affected with voice loss or chronic …
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Developing a Drug Delivery System for Treatment of Vocal Fold Scarring
<p>Vocal fold scarring is an affliction that results in the formation of a disorganized and stiff extracellular matrix (ECM) with abnormal ECM component densities & structures including a significant increase in collagen deposition. It is caused by improper healing post injury and results in …
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Voice source modeling and analysis of speakers with vocal-fold nodules
Thesis (Ph. D.)--Massachusetts Institute of Technology, Whitaker College of Health Sciences and Technology, 1998.
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Classification of vocal fold vibration as regular or irregular in normal, voiced speech
Irregular phonation serves an important communicative function in human speech and occurs allophonically in American English. This thesis uses cues from both the temporal and frequency domains - such as fundamental frequency, normalized RMS amplitude, smoothed-energy-difference amplitude (a measure …
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Impact of human vocal fold vibratory asymmetries on acoustic characteristics of sustained vowel phonation
… decisions by coupling visual observations of vocal fold tissue motion with auditory-perceptual assessments of voice quality. The details of the relationship between vocal fold tissue motion and the voice produced are not fully understood, and there is recent evidence that the diagnostic …
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The Decelluarized Human Umbilical Vein (HUV) as an Allogeneic Scaffold for Vocal Fold Tissue Engineering
… for use as a biological tissue engineering scaffold. Thus far, it has been used as an extracellular matrix (ECM) scaffold for cardiovascular tissue engineering applications due to its many structural and biomechanical advantages. Since the HUV is vascular derived, the chemical and physical …
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The Decelluarized Human Umbilical Vein (HUV) as an Allogeneic Scaffold for Vocal Fold Tissue Engineering
… for use as a biological tissue engineering scaffold. Thus far, it has been used as an extracellular matrix (ECM) scaffold for cardiovascular tissue engineering applications due to its many structural and biomechanical advantages. Since the HUV is vascular derived, the chemical and physical …
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Radiologic, Histologic and Functional Analysis after Transplantation of Autologous Cultured Chondrocytes into Trachea and Vocal Fold
… examination showed that the implanted scaffolds were completely covered with regenerated mucosa without granulation or stenosis. Histologically, the grafts showed no signs of inflammatory reaction and were covered with ciliated epithelium. Even when grafts were broken and migrated from …
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The effects of acidified pepsin on porcine vocal fold tissue: Developing a porcine model of laryngopharyngeal reflux disease
… relating to laryngeal disease because porcine vocal folds are most similar to human vocal folds from a structural, biochemical, neuromuscular, and cellular perspective. By utilizing the pig as a model of laryngeal disease, research involving basic, translational, and clinical questions can be …
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Beyond Clinical Measures: A Mixed-Methods Study of a Systematized Voice Therapy Protocol for Perioperative Rehabilitation of Benign Vocal Fold Lesions
… Patients undergoing phonomicrosurgery for benign vocal fold lesions (BVFLs) face a postoperative period in which adherence to voice rest and rehabilitation protocols is critical to wound healing and recovery. Despite this, no systematized perioperative voice therapy protocol exists, and the …
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Laryngeal function associated with changes in lung volume during voice and speech production in normal speaking women
… laryngeal position (VLP); (2) amplitude of vocal fold vibration; (3) minimum flow; (4) degree of glottal closure, and (5) degree of laryngeal compression. Results indicated that during phonation at high lung volumes the larynx displays an overall "more dilated" configuration with a lower …
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Modeling and Manufacturing of Dynamic Vocal Folds: First Steps Towards an Active Voice-Box Prosthesis
The movement and control of the vocal folds within the laryngeal cavity enables three crucial physiological functions: 1) allowing respiration by opening, 2) aiding in airway protection by closing, and 3) regulating sound production during phonation. Although treatment options have improved, many …
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Post laryngoplasty ultrasonography of the horse larynx
… cross-sectional area; the distance between the vocal folds in exhalation and inhalation, basihyoid depth, rostral thyroid cartilage depth, and distance between the basihyoid and thyroid cartilage was also measured. The ultrasonographically visible presence or absence of the laryngeal ventricles …
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HIGH PERFORMANCE AGENT-BASED MODELS WITH REAL-TIME IN SITU VISUALIZATION OF INFLAMMATORY AND HEALING RESPONSES IN INJURED VOCAL FOLDS
… to the inflammatory and healing responses of vocal folds at the physiological scale in mammals. The second direction involves improvements and extensions of the existing state-of-the-art vocal fold repair models. These improvements and extensions include comprehensive visualization of large …
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Modeling the Mechanical Effects of Liquid Mediated Adhesion Between the Human Vocal Folds
The vocal folds are a complex self-oscillating biological system. In the current research, an equation was developed to model viscous adhesion forces that occur when the collision of the vocal folds results in the formation of a liquid bridge. The adhesion equation was validated using experimental …
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