Table 3 Interpretation of quantitative imaging parameters
From: Quantitative imaging analysis detects subtle airway abnormalities in symptomatic military deployers
Predominant phenotype | QI imaging parameter(s) | Interpretation | Criteria for abnormal | Controls n = 45 | Deployers n = 82 | p-value* |
|---|---|---|---|---|---|---|
Emphysema | LAA%-950 (%) | Increases with extent of emphysema | ≥ 10% low attenuation areas | 9 (20%) | 19 (23%) | 0.004 |
Airway | Pi10 (mm) | Increases with extent of airway wall thickening | > median (2.26 mm) | 8 (18%) | 28 (34%) | |
Mixed | LAA%-950 (%) Pi10 (mm) | As above for both parameters | ≥ 10% low attenuation areas > median (2.26 mm) | 2 (4%) | 13 (16%) | |
Normal | LAA%-950 (%) Pi10 (mm) | – | < 10% low attenuation areas ≤ median (2.26 mm) | 26 (58%) | 22 (27%) | |
Air trapping | E/I TLV Ratio E/I MLD Ratio LAA%-856 (%) | Increase with extent of air trapping | No established cut points | – | – | – |