1. Method of segmenting a three-dimensional structure of interest which is contained in an object from a plurality of two-dimensional images, wherein each of the plurality of images represents a slice of the object, the method comprising the steps of: determining images of the plurality of two-dimensional images with insufficient feature information for the structure of interest; manually drawing attractors in the form at least a partial contour of the structure of interest in the images of the plurality of two-dimensional images; and segmenting the structure of interest in the plurality of images by using the attractors.