Yutaka Isogai

Observation of vocal fold vibration by x‐ray stroboscopy

Every laryngologist wants to observe the vibratory pattern of the vocal cords from all directions. A pulse generated x‐ray equipment has recently been widely used as part of diagnostic procedure especially for cardiovascular lesions. Voice‐synchronized x‐rays can be obtained by use of a pulse signal from a laryngostroboscope as a trigger to this x‐ray equipment. An experimental sound was obtained by use of the resected larynx of a human and a cannine. As contrasting mediae, lead particles were inserted into the vocal cord itself. Therefore, the vibratory pattern of the upper and lower surfaces of the vocal cords, and in addition, the vibratory movements under the epithelium could be simultaneously demonstrated on a videoscope while being photographed using a 35‐mm fluoro‐cinematograph. In addition, this method was applied to the study of the effects of various laryngeal lesions. The vibratory patterns obtained were compared to ones obtained by conventional laryngostroboscopy and discussed from the viewpoi...