Premium
Comparison of endoscopic versus 3D CT derived airway measurements
Author(s) -
Calloway Hollin E.,
Kimbell Julia S.,
Davis Stephanie D.,
RetschBogart George Z.,
Pitkin Elizabeth A.,
Abode Kathleen,
Superfine Richard,
Zdanski Carlton J.
Publication year - 2013
Publication title -
the laryngoscope
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.181
H-Index - 148
eISSN - 1531-4995
pISSN - 0023-852X
DOI - 10.1002/lary.23836
Subject(s) - epiglottis , airway , pharynx , medicine , nuclear medicine , larynx , endoscopy , concordance , radiology , anatomy , surgery
Objectives/Hypothesis To understand: 1) how endoscopic airway measurements compare to three‐dimensional (3D) CT derived measurements; 2) where each technique is potentially useful; and 3) where each has limitations. Study Design Compare airway diameters and cross‐sectional areas from endoscopic images and CT derived 3D reconstructions. Methods Videobronchoscopy was performed and recorded on an adult‐sized commercially available airway mannequin. At various levels, cross‐sectional areas were measured from still video frames using a referent placed via the biopsy port. A 3D reconstruction was generated from a high resolution CT of the mannequin; planar sections were cut at similar cross‐sectional levels; and cross‐sectional areas were obtained. Results At three levels of mechanically generated tracheal stricture, the differences between the endoscopic measurement and CT‐derived cross‐sectional area were 1%, 0%, and 7% (1.8, 0.8, and 14 mm 2 ). At the vocal folds, the difference was 9% (7.8 mm 2 ). The tip of the epiglottis and width of the epiglottis differed by 27% and 10% (18.73 mm 2 , 0.40mm). The airway measurements at the base of tongue, minimal cross‐sectional area of the pharynx, and choana differed by 26%, 36%, and 30% (101.40 mm 2 , 36.67 mm 2 , 122.71 mm 2 ). Conclusions Endoscopy is an effective tool for obtaining airway measurements compared with 3D reconstructions derived from CT. Concordance is best in geometrically simple areas where the entire cross‐section measured is visible within one field of view (trachea, round; vocal folds, triangular) versus geometrically complex areas that encompass more than one field of view (i.e. pharynx, choana). Level of Evidence N/A. Laryngoscope , 123:2136–2141, 2013