The Role of Infection in Acute Exacerbation of Idiopathic Pulmonary Fibrosis

Table 1

HRCT scoring criteria.

HRCT imaging	Scores
Ground-glass changes
No ground-glass opacities	0
Ground-glass opacity %	1
Ground-glass opacity area 6-24%	2
Ground-glass opacity area 25-49%	3
Ground-glass opacity area 50-74%	4
Ground glass opacity %	5
Reticular changes (septal thickening)
No reticular shadow	0
Reticular shadow %	1
Reticular shadow area 6-24%	2
Reticular shadow area 25-49%	3
Reticular shadow area 50-74%	4
Reticular shadow %	5
Honeycomb-like changes
No honeycombing	0
Honeycombing %	1
Honeycombing area 6-24%	2
Honeycombing area 25-49%	3
Honeycombing area 50-74%	4
Honeycombing %	5
Total

The “area” indicates the percentage of lesions in the corresponding HRCT scans.