Fig. 3

Histogram of radiomic feature recommendations by modality, excluding image transforms. Up to five features were extracted from each study, according to significance or model contribution. GLCM grey-level co-occurrence matrix, GLDZM grey-level distance-zone matrix, GLRLM grey-level run length matrix, GLSZM grey-level size zone matrix, NGTDM neighbouring grey tone difference matrix, NGLDM neighbouring grey-level dependence matrix