Fig. 1

Typical lung ultrasound and corresponding lung CT images of patients with various LUS score. A: Lung images of a patient with a low LUS score; A1: normal pleural line and no B-line, score 0; A3: normal pleural line and well-spaced B-lines ≥ 3, score 1; A2: lung CT in the corresponding areas. B: Lung images of a patient with a moderate LUS score; B1: normal pleural line and multiple coalescent B-lines, score 2; B3: irregular pleural line and well-spaced B-lines ≥ 3, score 2; B2: lung CT in the corresponding areas. C: Lung images of a patient with a high LUS score; C1: irregular pleural line and lung consolidation, score 4; C3: blurred pleural line and multiple coalescent B-lines, score 4; C4: blurred pleural line and lung consolidation, score 5; C6: irregular pleural line and lung consolidation, score 4; C2, C5: lung CT in the corresponding areas. (Note: Lung images of all 12 regions of each patient are not shown in the figure. The total LUS score should be calculated with a total score of 12 regions.)