Table 1.

Summary of most frequently used radiomic features.

Category	Features
Traditional nontexture features	Size (area, volume, major, and minor axis length, surface area) Shape (elongation, flatness, sphericity, and spherical disproportion) Location of a lesion
First-order texture features	Mean gray-level intensity Energy Entropy Standard deviation Skewness Kurtosis
Higher-order texture features	Gray-level co-occurrence matrix Gray-level run length matrix Gray-level size zone matrix Autoregressive model