Yumi Sasaki

Radiographic Analysis of Laryngeal Movement during Phonation by Digital Fluorography

Yumi Sasaki and Hiroshi Okamura Movements of laryngeal components for different vocal attacks were investigated with the use of a digital fluorography (DF) system. In this paper, three kinds of vocal attacks (soft , hard and breathy attack) were compared through subtracted images obtained with TID mode subtraction technique. In the hard attack, the vocal folds during adduction were thicker and the false vocal folds adduction was more marked than in the soft attack . The distention of the subglottal space due to the increase in subglottal presser was larger in the hard attack than in the soft one . In the breathy attack, the vocal folds during adduction were thinner than in the soft attack , and the false vocal folds did not adduct. These findings suggested an existence of a incomplete glottal closure before phonation.