COVID-19 imaging: Diagnostic approaches, challenges, and evolving advances

Table 2 Three main chest computed tomography scoring systems use for coronavirus disease-2019 and their characteristic features

	Chest CT Scoring Systems for COVID-19
Characteristics of Chest CT Scoring Systems	Chest Computed Tomography Severity Score[52]	Total Severity Score [53]	Chest Computed Tomography Score [54]
Division of Lungs	20 regions for each lung	5 lobes	5 lobes
Methodology of Score Calculation	Each region scored & amount totaled	Each lobe scored and amount totaled	Each lobe scored and amount totaled
Characteristics Scored	Amount of opacification	% of disease in each lobe (1GGOs, mixed GGOs, consolidation)	% of disease in each lobe (no specific features)
Scoring Scale	0 = 0%; 1 = 1%-50%; 2 = 51%-100%	0 = 0%; 1 = 1%-25%; 2 = 26%-50%; 3 = 51%-75%; 4 = 76%-100%	0 = 0%; 1 ≤ 5%; 2 = 5%-25%; 3 = 26%-49%; 4 = 50%-75%; 5 ≥ 75%
Sensitivity & Specificity	83% & 94%	83% & 100%	80% & 82%
Lowest Score for Severe COVID-19 Cases	19.5	7.5	7
Designed Specifically for COVID-19 Disease	Yes	Yes	Yes

¹Ground glass opacities. Modified based on study from Wasilewski et al[47]. CT: Computed tomography; COVID-19: Coronavirus disease-2019; GGO: Ground-glass opacities.