1. A method comprising: obtaining data from a computed tomography device; receiving a user selection of a set of voxels of a target object comprised by said initial image; deriving an initial segmentation of said target object, said initial segmentation based on a prominent intensity of said target object; rendering an initial image based upon said initial segmentation; determining a principal mode from a prior segmentation via a mean shift algorithm that comprises an evaluation of a determined voxel intensity change within said initial segmentation; providing said principal mode to an algorithm that is adapted to derive an improved image of said target object; and rendering said improved image of said target object.