Quantitative volumetry of ground-glass nodules on high-spatial-resolution CT with 0.25-mm section thickness and 1024 matrix: Phantom and clinical studies

•High-spatial-resolution CT provided more accurate volume of a −800-HU nodule in a phantom than conventional settings.•The maximum CT attenuation values were significantly higher in high-resolution setting than conventional setting.•The high-resolution setting might allow earlier detection of solid components in GGNs during follow-up.