Fig. 1.

Brixia score: (a) zone definition and (b–d) examples of annotations. Lungs are first divided into six zones on frontal chest X-rays. Line A is drawn at the level of the inferior wall of the aortic arch. Line B is drawn at the level of the inferior wall of the right inferior pulmonary vein. A and D upper zones; B and E middle zones; C and F lower zones. A score ranging from 0 (green) to 3 (black) is then assigned to each sector, based on the observed lung abnormalities. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)