1. An image processing apparatus for segmenting a region of interest in multi-dimensional image data of an object, comprising: an interface for receiving the image data of the object including the region of interest to be segmented, a selection unit for selecting a deformable model of an anatomical structure corresponding to the object in the image data, a processing unit for segmenting the region of interest by adapting the deformable model on the basis of the image data and additional anatomical information of the object, wherein the processing unit is designed to adapt a position of an element of the deformable model on the basis of the image data and a known position of an anatomical feature of the object.