Accuracy of measurements on digital videostroboscopic images of the vocal folds

Speyer, Renée, Wieneke, George H., Kersing, Willem, and Dejonckere, Philippe H. (2005) Accuracy of measurements on digital videostroboscopic images of the vocal folds. Annals of Otology, Rhinology and Laryngology, 114 (6). pp. 443-450.

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Abstract

Objectives: The reliability of objective measurements on digital laryngeal images was investigated. Methods: The magnitude of the error of measurement of surface areas by visually tracing the outline was determined for three different areas: the area of the lesion and, during vibration, the glottal area on maximal opening of the vocal folds and the glottal area on maximal closing of the vocal folds. Results: The errors in these areas were 10% to 30%. The results suggest that the error is mainly due to the uncertainty of the real outline of areas with a vague boundary. Correction for differences in magnification between two images (posttherapy and pretherapy) is of importance in about 25% to 65% of cases, depending on the area measured. Conclusions: Only when the magnification ratio is small (less than about 010% from 1.0) may a correction not be necessary.

Item ID: 31014
Item Type: Article (Research - C1)
ISSN: 1943-572X
Keywords: accuracy, digitized image, laryngostroboscopy, measurement error, vocal fold
Date Deposited: 26 Feb 2014 04:17
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1103 Clinical Sciences > 110315 Otorhinolaryngology @ 100%
SEO Codes: 92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920107 Hearing, Vision, Speech and Their Disorders @ 100%
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