New laryngoscope for quantitative high-speed imaging of human vocal folds vibration in the horizontal and vertical direction.
We report the design of a novel laser line-triangulation laryngoscope for the quantitative visualization of the three-dimensional movements of human vocal folds during phonation. This is the first successful in vivo recording of the three-dimensional movements of human vocal folds in absolute values. Triangulation images of the vocal folds are recorded at the rate of 4000 fps with a resolution of 256x256 pixels. A special image-processing algorithm is developed to precisely follow the subpixel movements of the laser line image. Vibration profiles in both horizontal and vertical directions are calibrated and measured in absolute SI units with a resolution of +/-50 microm. We also present a movie showing the vocal folds dynamics in vertical cross section.
George
Nibu A
NA
University Medical Centre Groningen and University of Groningen, Groningen Voice Research Lab, Department of Biomedical Engineering, 9700 AD Groningen, The Netherlands.
de Mul
Frits F M
FF
Qiu
Qingjun
Q
Rakhorst
Gerhard
G
Schutte
Harm K
HK
D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D007089:Image Enhancement / Q000295:instrumentation*; D007090:Image Interpretation, Computer-Assisted / Q000295:instrumentation* / Q000379:methods; D020704:Laryngoscopes; D010699:Phonation / Q000502:physiology*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013068:Speech Production Measurement / Q000295:instrumentation / Q000379:methods; D014741:Video Recording / Q000295:instrumentation*; D014827:Vocal Cords / Q000033:anatomy & histology* / Q000502:physiology*