Figure 3.

Bedside long-range (LR) optical coherence tomography (OCT) of the intubated neonatal airway. A 0.7-mm outer diameter OCT probe (75–80 cm length) is housed in a transparent sheath (1.17-mm outer diameter) and proximally connected to a combined motor unit. The probe is inserted through an external Y-connector and advanced inside the endotracheal tube. LR-OCT signal is reflected at 90° and penetrates the airway wall perpendicular to the tissue plane. Data are acquired in a retrograde, helical pattern as the probe undergoes high-speed 360° rotation and retraction through the upper airway. ETT = endotracheal tube; FEP = fluorinated ethylene propylene.