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15 November 1978 A New Optical/Lighting System For High Speed Laryngeal Cinematography
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Abstract
Abnormal laryngeal function during speech produced by many profoundly deaf students attending the National Technical Institute for the Deaf is indicated by acoustical and perceptual measures. To assist in objectifying the diagnosis and treatment of these vocal disorders, a physiological assessment of laryngeal activity is warranted. High speed laryngeal photography was selected as a principle tool for this assessment because of the very rapid vibratory period of the vocal cords. To illuminate the larynx for film speeds of up to 6,000 frames per second, a xenon arc light source is coupled with an optical system to project a high intensity light beam on the vocal folds. The projected beam is filtered to reduce infra-red and ultra-violet radiation. Light is projected paraxial to the camera lens to intersect on a laryngeal mirror positioned in the oropharynx of the subject. Methods of synchronizing the high speed film with additional acoustic and physiologic measures will be discussed.
© (1978) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Donald H. Peterson, Dale E. Metz, and Robert L. Whitehead "A New Optical/Lighting System For High Speed Laryngeal Cinematography", Proc. SPIE 0152, Recent and Future Developments in Medical Imaging I, (15 November 1978); https://doi.org/10.1117/12.938202
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