Imaging of vocal fold vibration by digital multi-plane kymography

Digital multi-plane kymography is presented as a new method to demonstrate vocal fold vibration from digital high-speed recordings. Single lines from digital high-speed sequences of laryngoscopical examinations are concatenat ed to images, which are called kymograms. In order to reveal anterior-poste rior (AP) modes of vibration several kymograms from different location of t he glottis can be obtained from a single recording. Problems due to rotatio n of the endoscope or relative movements of patient or examiner can be solv ed by image processing algorithms specifically designed for this applicatio n. Different types of phonation onset and examples of voice disorders are g iven. (C) 1999 Elsevier Science Ltd. All rights reserved.