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Real-Time Magnetic Resonance Imaging of Velopharyngeal Activities with Simultaneous Speech Recordings.
MedLine Citation:
PMID:  21214321     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Abstract Objective: To examine the relationships between acoustic and physiologic aspects of the velopharyngeal mechanism during acoustically nasalized segments of speech in normal individuals by combining fast magnetic resonance imaging (MRI) with simultaneous speech recordings and subsequent acoustic analyses. Design: Ten normal Caucasian adult individuals participated in the study. Midsagittal dynamic MRI and simultaneous speech recordings were performed while participants were producing repetitions of two rate-controlled nonsense syllables including /zanaza/ and /zunuzu/. Acoustic features of nasalization represented as the peak amplitude and the bandwidth of the first resonant frequency (F1) were derived from speech at the rate of 30 sets per second. Physiologic information was based on velar and tongue positional changes measured from the dynamic MRI data which were acquired at a rate of 21.4 images per second and resampled with a corresponding rate of 30 images per second. Each acoustic feature of nasalization was regressed on gender, vowel context, and velar and tongue positional variables. Results: Acoustic features of nasalization represented by F1 peak amplitude and bandwidth changes were significantly influenced by the vowel context surrounding the nasal consonant, velar elevated position, and tongue height at the tip. Conclusions: Fast MRI combined with acoustic analysis was successfully applied to the investigation of acoustic-physiologic relationships of the velopharyngeal mechanism with the type of speech samples employed in the present study. Future applications are feasible to examine how anatomic and physiologic deviations of the velopharyngeal mechanism would be acoustically manifested in individuals with velopharyngeal incompetence. Keywords: MRI, speech recordings, acoustic analysis.
Authors:
Youkyung Bae; David Kuehn; Charles Conway; Bradley Sutton
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2010-12-23
Journal Detail:
Title:  The Cleft palate-craniofacial journal : official publication of the American Cleft Palate-Craniofacial Association     Volume:  -     ISSN:  1545-1569     ISO Abbreviation:  -     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2011-1-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9102566     Medline TA:  Cleft Palate Craniofac J     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
1 New Mexico State University.
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