Assessment of air trapping using postexpiratory high-resolution computed tomography

Area of Science:

• Radiology
• Pulmonology
• Medical Imaging

Background:

• Air trapping is a key feature of obstructive lung disease (OLD).
• High-resolution computed tomography (HRCT) is a valuable imaging technique for lung assessment.
• Evaluating air trapping using HRCT requires understanding changes between inspiratory and expiratory phases.

Purpose of the Study:

• To assess the utility of postexpiratory HRCT in evaluating air trapping in patients with obstructive lung disease.
• To compare air trapping in healthy volunteers versus patients with OLD using HRCT.
• To correlate HRCT findings with pulmonary function tests.

Main Methods:

• Inspiratory and postexpiratory HRCT scans were performed on 13 healthy volunteers and 14 patients with OLD.
• Lung attenuation was measured during inspiration and expiration.
• Air trapping extent was visually assessed on postexpiratory scans and correlated with pulmonary function tests.

Main Results:

• Patients with OLD showed significantly different lung attenuation and air-trapping scores compared to healthy volunteers.
• Air trapping was present in all patients with OLD and 61% of healthy participants, with greater extent in OLD patients.
• Lung attenuation change and air-trapping scores significantly correlated with pulmonary function tests (p < 0.001, r = 0.61-0.89).

Conclusions:

• Inspiratory and postexpiratory HRCT is a valuable tool for evaluating air trapping in obstructive lung disease.
• Both quantitative lung attenuation measurements and qualitative air-trapping assessment are effective analytical methods.
• HRCT findings demonstrate significant differences in air trapping between healthy individuals and patients with OLD.