Airway wall thickness in cigarette smokers: quantitative thin-section CT assessment

Area of Science:

• Pulmonary Medicine
• Radiology
• Medical Imaging Analysis

Background:

• Chronic Obstructive Pulmonary Disease (COPD) is a major health concern.
• Airway wall thickening is a key feature in COPD.
• Accurate measurement of airway dimensions is crucial for diagnosis and monitoring.

Purpose of the Study:

• To develop and validate software for measuring airway dimensions on thin-section CT images.
• To compare airway wall thickness in smokers with and without COPD to nonsmokers.
• To assess the relationship between airway dimensions and lung function.

Main Methods:

• A dedicated software tool using the Laplacian of Gaussian algorithm was developed and validated.
• The study prospectively included nonsmokers, smokers without COPD, and smokers with COPD.
• Airway wall area (WA), internal area (IA), and normalized airway wall thickness (SigmaWA/SigmaIA) were calculated from CT scans.

Main Results:

• The software demonstrated reliable and repeatable measurements of airway dimensions.
• A significantly higher normalized airway wall thickness was observed in smokers with COPD compared to the other groups (P < .001).
• Airway wall thickness and internal area correlated significantly with lung function parameters like FEV1 and specific airway conductance.

Conclusions:

• The developed software accurately measures airway dimensions on CT images.
• In vivo normalized airway wall thickness is increased in smokers with COPD.
• These findings highlight the utility of CT-based airway measurements in understanding COPD pathophysiology.