When static meets dynamic: Comparing cone-beam computed tomography and acoustic reflection for upper airway analysis

Area of Science:

• Medical Imaging
• Respiratory System Anatomy
• Diagnostic Technologies

Background:

• Accurate upper airway measurement is crucial for diagnosing breathing disorders.
• Acoustic reflection (AR) is an established method for airway assessment.
• This study compares AR with cone-beam computed tomography (CBCT) for airway analysis.

Purpose of the Study:

• To compare upper airway volume and area measurements obtained via CBCT and AR.
• To evaluate the accuracy and reliability of CBCT against AR in airway assessment.
• To determine the clinical significance of any observed differences.

Main Methods:

• 59 subjects with existing CBCT scans underwent AR measurements.
• Upper airway dimensions (5 areas) were measured using both CBCT and AR (acoustic rhinometry and pharyngometry).
• Volumes and minimal cross-sectional areas were extracted and compared using specialized software.

Main Results:

• High reliability (r > 0.77) was observed for measurements repeated two weeks apart.
• Significant differences were found in total nasal volume (P=0.035) but not anterior nasal volume or minimal cross-sectional area.
• Pharyngeal volume showed significant differences (P=0.01) with high correlation (r=0.755), but pharyngeal minimal cross-sectional area did not differ significantly (P=0.109).

Conclusions:

• CBCT is a reliable method for measuring anterior nasal volume and minimal cross-sectional area.
• CBCT accurately assesses pharyngeal volume and minimal cross-sectional area.
• The findings support CBCT as an accurate tool for upper airway analysis in clinical practice.