1. A method, comprising: obtaining a first image of first contrast agent uptake in non tissue of interest of a patient for a predetermined region of interest, wherein the first image is generated based on first data from a first imaging modality; obtaining a second image of second contrast agent uptake in tissue of interest and the non tissue of interest of the patient for the same region of interest, wherein the second image is generated based on second data from a second different imaging modality; generating a first image mask for the non tissue of interest in the region of interest based on the first image; generating a first feature image by using the first image mask to mask the second contrast agent uptake in the non tissue of interest in the second image and extracting the second contrast agent uptake in the tissue of interest from the second image, wherein the first feature image includes the extracted second contrast agent Uptake in the tissue of interest in the second image; and displaying at least the first feature image.