Fig. 3.

Correlation between vascular diameter and computed tomography (CT) volume. White circles and black circles indicate patients with mild–moderate and severe–critical condition, respectively. a Scatter plot showing significant positive correlation between total CT lung volume and normal lung volume (r = 0.891, p < 0.001). b Scatter plot showing weak negative correlation between total CT lung volume and total consolidation volume (r = − 0.344, p = 0.001). c Scatter plot showing correlation between maximum subsegmental vascular diameter and extent of CT lesions. A correlation was seen (r = 0.440, p < 0.001), but vascular enlargement was seen in patients without a large amount of consolidation