High-resolution computed tomography in silicosis: correlation with chest radiography and pulmonary function tests

Area of Science:

• Pulmonary Medicine
• Radiology
• Occupational Health

Background:

• Silicosis is a progressive lung disease caused by silica dust inhalation.
• Accurate detection and staging are crucial for patient management.
• Traditional chest X-rays have limitations in visualizing early disease and fibrosis.

Purpose of the Study:

• To correlate tomographic findings with pulmonary function in silicosis patients.
• To compare the diagnostic accuracy of chest X-ray versus high-resolution computed tomography (HRCT).
• To assess the utility of HRCT in identifying progressive massive fibrosis.

Main Methods:

• A cross-sectional study of 44 non-smoking silicosis patients.
• Chest X-rays classified per International Labour Organization (ILO) guidelines.
• HRCT assessed for pulmonary involvement, opacities, and emphysema using a semiquantitative system.
• Pulmonary function tests including spirometry, forced oscillation, lung volumes (helium dilution), and diffusing capacity for carbon monoxide (DLCO).

Main Results:

• HRCT identified progressive massive fibrosis in 33 patients, compared to 23 on X-ray.
• Opacity score correlated with airflow, DLCO, and compliance.
• Emphysema score showed inverse correlation with lung volume, DLCO, and airflow.
• Deterioration in pulmonary function was associated with the extent of structural changes.

Conclusions:

• HRCT scans are superior to X-rays for early silicosis detection.
• HRCT is more effective in identifying progressive massive fibrosis.
• HRCT findings correlate with functional lung impairment in silicosis.