Estimation of inferior-superior vocal fold kinematics from high-speed stereo endoscopic data in vivo.

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Estimation of inferior-superior vocal fold kinematics from high-speed stereo endoscopic data in vivo.

J Acoust Soc Am. 2014 Dec;136(6):3290

Authors: Sommer DE, Tokuda IT, Peterson SD, Sakakibara K, Imagawa H, Yamauchi A, Nito T, Yamasoba T, Tayama N

Abstract
Despite being an indispensable tool for both researchers and clinicians, traditional endoscopic imaging of the human vocal folds is limited in that it cannot capture their inferior-superior motion. A three-dimensional reconstruction technique using high-speed video imaging of the vocal folds in stereo is explored in an effort to estimate the inferior-superior motion of the medial-most edge of the vocal folds under normal muscle activation in vivo. Traditional stereo-matching algorithms from the field of computer vision are considered and modified to suit the specific challenges of the in vivo application. Inferior-superior motion of the medial vocal fold surface of three healthy speakers is reconstructed over one glottal cycle. The inferior-superior amplitude of the mucosal wave is found to be approximately 13 mm for normal modal voice, reducing to approximately 3 mm for strained falsetto voice, with uncertainty estimated at σ ≈ 2 mm and σ ≈ 1 mm, respectively. Sources of error, and their relative effects on the estimation of the inferior-superior motion, are considered and recommendations are made to improve the technique.

PMID: 25480074 [PubMed - indexed for MEDLINE]

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