1. A method for evaluating evolution of tumoural lesions, said method comprising the steps of: providing a first image of said tumoural lesions, said first image being made at a first time instant; providing a second image of said tumoural lesions, said second image being made at a second time instant that is later than said first time instant; delineating a border of said tumoural lesions in said first image and said second image; registration of said tumoural lesions in said first image and said second image; segmenting said tumoural lesions in said first image and said second image into concentric areas; quantifying changes of at least one functional parameter between said concentric areas in said first image and respective corresponding concentric areas in said second image; and visualizing said changes in a two-dimensional or three-dimensional model of said tumoural lesions.