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Author Patel, Rita R
Title High speed digital imaging and kymographic analyses of vocal fold vibrations
book jacket
Descript 162 p
Note Source: Dissertation Abstracts International, Volume: 67-12, Section: B, page: 7045
Adviser: Diane M. Bless
Thesis (Ph.D.)--The University of Wisconsin - Madison, 2006
High speed digital imaging (HSDI) and kymography have the potential to provide detailed biomechanical assessment of vocal fold vibration because capture rates of up to 8000 frames per second, make it is possible to assess cycle-to-cycle variations that can be extremely aperiodic, brief, and transitory. The overall purpose of the three studies comprising this dissertation was to study normal and disordered vibratory patterns obtained from HSDI and kymography across gender and pathology groups. Invariant moment based features were extracted from the two dimensional Fourier transform to study pattern recognition of digital kymographs across gender and three phonatory tasks (normal pitch normal loudness, normal pitch loud and high pitch normal loudness) among participants with and without hoarseness in Study A. Principal component analysis of gender and task analysis across participants without dysphonia (Study A) revealed that 90% of the variance was explained in the plane defined by two features: eigen vector 1 and eigen vector 2, suggesting spatial and temporal vibratory differences in phonatory physiology across normal participants. Analysis across participants with and without dysphonia revealed that approximately 82% of the variance was accounted by eigen vector 1 and eigen vector 2 for both male and female participants suggesting that two features capture most of the salient temporal and spatial features of digital kymographs across gender and phonatory tasks. Study B used image processing approaches to extract motion waveforms from HSDI to differentiate adductor spasmodic dysphonia from muscle tension dysphonia. Features of aperiodicities, oscillatory breaks (as small as 8 ms), and micro motions were greater in number for the spasmodic dysphonia group whereas hyperfunction was greater in muscle tension dysphonia group. Study C investigated the clinical value of HSDI compared to stroboscopy across three laryngeal pathology groups classified as either disorders of epithelium, subepithelium, or neuromuscular. Results revealed that 63% of participants with laryngeal pathology could not be judged on stroboscopy because of the severity of the voice disorder, and its concomitant aperiodicity, whereas HSDI resulted in analysis of 100% of the data. Neuromuscular group was most difficult to judge with stroboscopy, followed by epithelial and subepithelial groups in that order
School code: 0262
Host Item Dissertation Abstracts International 67-12B
Subject Health Sciences, Speech Pathology
Engineering, Biomedical
0460
0541
Alt Author The University of Wisconsin - Madison
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