1. An image processing apparatus for segmenting a region of interest in multi-dimensional image data of an object, comprising: a memory storing a deformable mesh model of an anatomical structure corresponding to the object in the image data; an interface configured to couple the image processing apparatus to a source of the image data of the object including the region of interest to be segmented; and a processing unit configured to receive, via the interface, the image data and to segment the region of interest by adapting a position of an element of the deformable mesh model to the anatomical structure identified in the image data and a distance between the element and a known position of an anatomical feature of the object, wherein the processing unit is configured to adapt the deformable mesh model to minimize a model energy comprising a spring energy derived from the distance.