Thin-section CT imaging that correlates with pulmonary function tests in obstructive airway disease.

Area of Science:

• Radiology
• Pulmonology
• Medical Imaging

Background:

• Obstructive airway diseases significantly impact respiratory health.
• Pulmonary function tests (PFTs) are crucial for diagnosing obstructive lung diseases.
• Computed tomography (CT) offers detailed anatomical insights into lung pathology.

Purpose of the Study:

• To identify independent CT imaging findings correlating with PFT results in obstructive airway diseases.
• To establish CT-based markers for detecting obstructive lung physiology.

Main Methods:

• Thin-section inspiratory and expiratory CT scans were performed on 68 patients with obstructive airway disease and 29 controls.
• Radiologists semi-quantitatively assessed lung attenuation (air trapping, mosaic perfusion) and airway abnormalities (wall thickening, bronchiectasis).
• Univariate, multivariate, and ROC analyses correlated CT findings with PFT parameters.

Main Results:

• Air trapping and bronchial wall thickening demonstrated the strongest correlation with obstructive PFTs (FEV1.0/FVC, MMEF, FEF75).
• Multivariate analysis identified air trapping and bronchial wall thickening as independent determinants of obstructive PFTs.
• Receiver operating characteristic (ROC) analysis indicated a one-third lung air trapping cut-off for identifying obstructive PFTs.

Conclusions:

• CT findings of air trapping and bronchial wall thickening are significant indicators of obstructive PFTs.
• A threshold of one-third lung air trapping on CT is a reliable marker for obstructive lung disease, independent of inspiratory findings.