1. A method for combining a plurality of segmented images into one multi-fused image for display to a user, comprising: providing a processor with a plurality of sets of functional image data, each acquired from a subject using a different tracer, selected from the group consisting of an individual tracer and a combination of tracers; in said processor, reconstructing a respective image from each of said sets of functional image data, each of said images showing a respectively different anatomical structure of interest of the subject resulting from the respective tracer used to produce the respective set of functional image data from which the respective image is reconstructed, but not showing respective anatomical structures of interest of the subject resulting from others of said tracers; in said processor, applying a segmentation algorithm to each of said images that segments the respective anatomical structure of interest in each of said images; in said processor, accessing electronically stored tracer-dependent look up tables that each represent a spatial dependency of one of said tracers; in said processor, respectively applying the tracer-dependent look up tables to the respective segmented anatomical structures of interest to produce, for each segmented anatomical structure of interest, a displayable version thereof wherein a visual appearance of the respective segmented anatomical structure of interest is adapted to the respective tracer thereof; in said processor, fusing the respective displayable versions of the respective anatomical structures of interest into one multi-fused image of the subject; and displaying said one multi-fused image of the subject at a display in communication with said processor.