1. A medical imaging system comprising: a display; a user input device; and a processor associated with the display and user input device, the processor configured to provide a user interface for the display and editing of a three dimensional medical image on the display, the user interface responsive to user inputs on the user input device, the user interface comprising: a framing tool operable to define a region of interest on the medical image; an image matrix including a plurality of cross-sectional images each corresponding to a cross-section of the medical image at one of a plurality of cut planes within the region of interest; one or more reference views of the medical image each including a plurality of reference indicia that each corresponds to a location of one of the plurality of cut planes; and a tool interface including a plurality of selectable control tools for use in segmenting and/or editing the cross-sectional images, the plurality of selectable control tools of the tool interface including a contouring/segmenting tool for defining contours and/or regions of an anatomical feature in the medical image, wherein the contouring/segmenting tool is usable in any of the cross-sectional images in the image matrix to define two-dimensional contours of the anatomical feature at each of the cut planes in the region of interest.