Table 1. Category of typical radiomics features in thorax.

Category	Implications
Morphological features	Features reflecting shape and physical characteristics of ROI
Histogram-based features	Features based on intensity histogram of ROI. These features do not retain spatial information
Texture features	Features based on pixel neighborhood information. These features consider pixel and its neighbors. GLCM features belong to this category
Airway features	Feature that model airway property based on skeletonization

GLCM = gray level co-occurrence matrix, ROI = region of interest