Radiographic analysis of laryngeal movement during phonation by digital fluorography.

概要

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In order to analyze the movement of vocal folds and the circumferential soft tissue during phonation, we tried to use digital subtraction techniques with digital fluorography system. Digital imaging was performed in 512 x 512, 8 bit matrix resolution at 30 frames per second. As subtraction techniques, continuous image (CI) mode and time interval difference (TID) mode were employed. These techniques were applied to two cases, one with normal larynx and one with unilateral vocal fold paralysis.<BR>The subtracted images provided the moving portion and distance of larynx during phonation clearly. Especially, the movement of vocal folds at the beginning and ending of phonation could be observed in detail. In addition, the vibrations of vocal folds during continuous phonation could be seen with stroboscopic effect.<BR>From these results, the above methods were thought to be useful for analyses of phonatory movement of larynges with some laryngeal diseases.
特定非営利活動法人日本気管食道科学会の論文