1. A medical imaging system for generating object data representative of a feature in a region of interest of an object, said system comprising: at least one image data acquisition device; a data processing unit; a display device; and an interface unit; said image data acquisition device being configured for acquiring image data of said region of interest, that embody multiple predetermined features, said data comprising picture elements; said data processing unit being configured for: deriving, for ones of said picture elements, respective probability values; displaying, via said display device, for interaction purposes, ones from among said probability values such that a plurality from among said features are in the displayed values: designating a feature from among the displayed features; deciding, based on the designated feature, what constitutes, from among, said multiple predetermined features, a closest relevant predetermined feature; and after said deciding, calculating, to thereby generate, object data on behalf of what was decided to be said closest relevant predetermined feature.