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Visual grading scheme. Scores are given to lung zones for which the left and the right lungs are divided into three zones for local analysis (see Fig. 2). Each zone has its own label indicating the existence of an abnormal imaging pattern for that particular zone.
| Visual scores | Percentage of the abnormality over zones |
Label for the presence of abnormality |
|---|---|---|
| 0 | Absence of abnormality | 0 |
| 1 | 0%–5% | 1 |
| 2 | 5%–25% | 1 |
| 3 | 25%–50% | 1 |
| 4 | 50%–75% | 1 |
| 5 | 75%–100% | 1 |
