1. Medical imaging system for generating object data of features of a region of interest of an object, comprising: at least one image data acquisition device; a data processing unit; a display device; and an interface unit; wherein the image data acquisition device is arranged to acquire image data of a region of interest of an object; wherein the data processing unit is adapted to determine probability values for predetermined features in the image data for each picture element; to determine closest relevant predetermined features on behalf of the designated features; to calculate object data on behalf of the determined features; and to use the calculated object data for further processes; wherein the display device is arranged to display the probability values for each picture element of the image data for interaction purposes; wherein the interface unit is adapted for the designation of features in the displayed probability values by interaction of the user.