1. A method of constructing a voxel-based representation of an anatomical structure, the method comprising the steps of: (a) acquiring a plurality of images of the anatomical structure; (b) defining a space of voxels, each having a size, with respect to the acquired images; (c) determining distances between the acquired images; (d) based on the determined distances and the voxel size, creating a sufficient number of interpolated images between the acquired images such that a sufficent number of voxels between images are intersected by pixels from at least one acquired image or interpolated image; and (e) assigning values to the voxels based on the intersecting pixels.