Quantitative Evaluation of Subglottic Stenosis Using Ultrashort Echo Time MRI in a Rabbit Model

Area of Science:

• Medical Imaging
• Radiology
• Otolaryngology

Background:

• Subglottic stenosis (SGS) is a critical airway narrowing.
• Accurate assessment of SGS and treatment response is vital for patient outcomes.
• Current methods like endotracheal tube (ETT)-sizing have limitations.

Purpose of the Study:

• To evaluate ultra-short echo time magnetic resonance imaging (UTE-MRI) for detecting SGS.
• To assess UTE-MRI's ability to monitor response to balloon dilation therapy.
• To correlate UTE-MRI measurements with ETT-sizing and investigate airway dynamics.

Main Methods:

• A rabbit model with induced SGS was used.
• Airway measurements were taken using UTE-MRI and ETT-sizing at baseline, post-injury, and post-treatment.
• Cross-sectional area (CSA), diameters, and eccentricity were quantified from UTE-MR images.

Main Results:

• UTE-MRI detected a significant reduction in CSA post-SGS injury (38%).
• UTE-MRI measurements correlated significantly with ETT-sizing, particularly after injury (r=0.93).
• Balloon dilation increased CSA but not to baseline levels; increased tracheal eccentricity was observed post-treatment.

Conclusions:

• UTE-MRI is effective in detecting SGS and evaluating treatment response in a rabbit model.
• UTE-MRI shows strong correlation with ETT-sizing, offering a potential non-invasive alternative.
• While SGS did not affect tracheal dynamics, balloon dilation led to increased eccentricity.