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a, b Relationship between m-CT value and maximum diameter of pure and mixed type GGO lesions. GGO lesions ≤1 cm in maximum diameter and ≤−600 HU in m-CT value are all pure type. Although, GGO lesions of both categories with a maximum diameter >1 cm and m-CT value >−600 HU are highly diagnosed as invasive lesions, specificity of pure GGO were significantly better than that of mixed GGO
