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J Biomed Opt. 2018 Oct;23(10):1-4. doi: 10.1117/1.JBO.23.10.100501.

Combined anatomical optical coherence tomography and intraluminal pressure reveal viscoelasticity of the in vivo airway.

Author information

1
University of North Carolina at Chapel Hill, Department of Biomedical Engineering, Chapel Hill, Nort, United States.
2
Physical Sciences Inc., Andover, Massachusetts, United States.
3
University of North Carolina at Chapel Hill, Department of Physics and Astronomy, Chapel Hill, North, United States.
4
University of North Carolina at Chapel Hill, Department of Otolaryngology/Head and Neck Surgery, Cha, United States.
5
University of North Carolina at Chapel Hill, Biomedical Research Imaging Center, Chapel Hill, North, United States.

Abstract

It is hypothesized that the local, viscoelastic (time-dependent) properties of the airway are important to accurately model and ultimately predict dynamic airway collapse in airway obstruction. Toward this end, we present a portable, endoscopic, swept-source anatomical optical coherence tomography (aOCT) system combined with a pressure catheter to capture local airway dynamics in vivo during respiration. aOCT scans were performed in the airways of a mechanically ventilated pig under paralysis with dynamic and static ventilation protocols. Validation of dynamic aOCT luminal cross-sectional area (CSA) measurements against Cine CT, obtained during the same exam, showed an aggregate difference of 15  %    ±  3  %  . aOCT-derived CSA obtained in the in vivo trachea also exhibited hysteresis as a function of pressure, depicting the viscoelastic nature of the airway wall. The volumetric imaging capabilities were validated by comparing aOCT- and CT-derived geometries of the porcine airway spanning nine generations from the trachea to the bronchioles. The ability to delineate regional differences in airway viscoelastic properties, by measuring airway deformation using aOCT combined with intraluminal pressure, paves the way to patient-specific models of dynamic airway collapse.

KEYWORDS:

dynamic airway imaging; elastography; endoscopic OCT; optical coherence tomography

PMID:
30350490
PMCID:
PMC6259006
[Available on 2019-10-22]
DOI:
10.1117/1.JBO.23.10.100501

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