Method for Horizontal Calibration of Laser-Projection Transnasal Fiberoptic High-Speed Videoendoscopy
Open Access
- 17 January 2021
- journal article
- research article
- Published by MDPI AG in Applied Sciences
- Vol. 11 (2), 822
- https://doi.org/10.3390/app11020822
Abstract
Objective: Calibrated horizontal measurements (e.g., mm) from endoscopic procedures could be utilized for advancement of evidence-based practice and personalized medicine. However, the size of an object in endoscopic images is not readily calibrated and depends on multiple factors, including the distance between the endoscope and the target surface. Additionally, acquired images may have significant non-linear distortion that would further complicate calibrated measurements. This study used a recently developed in vivo laser-projection fiberoptic laryngoscope and proposes a method for calibrated spatial measurements. Method: A set of circular grids was recorded at multiple working distances. A statistical model was trained that would map from pixel length of the object, the working distance, and the spatial location of the target object into its mm length. Result: A detailed analysis of the performance of the proposed method is presented. The analyses have shown that the accuracy of the proposed method does not depend on the working distance and length of the target object. The estimated average magnitude of error was 0.27 mm, which is three times lower than the existing alternative. Conclusion: The presented method can achieve sub-millimeter accuracy in horizontal measurement. Significance: Evidence-based practice and personalized medicine could significantly benefit from the proposed method. Implications of the findings for other endoscopic procedures are also discussed.Funding Information
- National Institutes of Health (P50 DC015446)
This publication has 30 references indexed in Scilit:
- Sexual Dimorphism in Laryngeal Volumetric Measurements Using Magnetic Resonance ImagingEar, Nose & Throat Journal, 2019
- Recommended Protocols for Instrumental Assessment of Voice: American Speech-Language-Hearing Association Expert Panel to Develop a Protocol for Instrumental Assessment of Vocal FunctionAmerican Journal of Speech-Language Pathology, 2018
- Biomechanical simulation of vocal fold dynamics in adults based on laryngeal high-speed videoendoscopyPLOS ONE, 2017
- Rater Methodology for Stroboscopy: A Systematic ReviewJournal of Voice, 2014
- In Vivo Measurement of Pediatric Vocal Fold Motion Using Structured Light Laser ProjectionJournal of Voice, 2013
- Evidence-Based Clinical Voice Assessment: A Systematic ReviewAmerican Journal of Speech-Language Pathology, 2013
- Extracting Physiologically Relevant Parameters of Vocal Folds From High-Speed Video Image SeriesIEEE Transactions on Biomedical Engineering, 2007
- Comparison of a flexible laryngoscope with calibrated sizing function to intraoperative measurements.Annals of Otology, Rhinology & Laryngology, 2006
- Common Practices of Voice Therapists in the Evaluation of PatientsJournal of Voice, 2005
- Vibration parameter extraction from endoscopic image series of the vocal foldsIEEE Transactions on Biomedical Engineering, 2002