Table 9 X-ray diagnosis classification

I

Only a wide range of small reticular particle shadows could be seen in the lung field, and the lower lobe was more obvious

II

The transparency of lung field began to decrease, with extensive reticular particle shadow, aerated bronchus sign and consolidation of both lungs

III

The shadow of fine particles in the lung field largely increased, and the transparency of the lung field decreased obviously. The aerated bronchus sign was more extensive, showing ground-glass changes

IV

The density of lung field generally increased, showing white lung and the disappearance of heart shadow