Abstract
Stroboscopy is an essential diagnostic tool in the assessment of the vocal folds during phonation. To evaluate stroboscopy, attention has been focused on symmetry, periodicity, glottic closure, amplitudes, waveforms and non-vibrating segments. Rating forms of the above criteria are used in evaluation, but this assessment is rough and not quantitative. For a more detailed estimation, this paper makes two proposals 1) the use of video prints of multiple sequence images of the glottal cycle and 2) the superimposition of the fundamental frequency (F0) on videostroboscopy. Usage of these video prints enables quantitative evaluation such as measurement of closed phase and glottal area and is effective for patient follow-up. Singers sometimes complain voice problems in high pitch phonation. Superimposition of F0 on videostroboscopy is useful in the detection of such an abnormality according to the changes of F0.
