Diffusion Weighted Imaging (DWI)	MRI technique based on the random Brownian motion measure of water molecules within a voxel of tissue.
Machine learning	A branch of artificial intelligence involving use and development of computer systems that are able to learn and adapt without following explicit instructions, by using algorithms and statistical models to analyse and draw inferences from patterns in data.
Radiomic features	Characteristics of a tissue or a lesion that can be extracted in form of data.
ROI	acronym of Region of Interest, the portion of an image over which radiomics features are extracted. It can be delineated manually, in semi-automatic of fully automatic way.
Radiomic signature	Computational model which aims to address either unmet clinical needs, mostly in the field of oncologic imaging, as biomarkers, for example, or to compare radiomics performance with that of radiologists.