Table 1.

State-of-the-art-parameters obtained from HRCT found in recent literature. In the specific, high-attenuation area (HAA)% [9] is defined as areas with attenuation values greater than −200 Hounsfield Unit (HU). HAA_A% [10] is defined as the percentage of the whole lung volume with a density between −250 and −600 HU. Pulmonary fibrosis fraction (PFF), normally attenuated lung (NL), HAA, LAA, and HAA parameters are expressed in percentage values (%) while kurtosis, skewness, mean lung density, median, and variance are expressed in absolute values.

HRCT Parameter	Acronyms	Reference
Pulmonary fibrosis fraction	PFF%	[7]
Normally Attenuated Lung	NL%	[8]
High Attenuation Area	HAA%	[9]
Low Attenuation Area	LAA%	[9]
High Attenuation Area	HAA_A%	[10]
Kurtosis	-	[11]
Skewness	-	[11]
Mean Lung Density	MLD	[11]
Median	-	[11]
Variance	-	[11]