The invention relates to a method and a device for registering 2D
projection images of an object relative to a 3D image data record of the
same object, in which, from just a few 2D projection images, a 3D feature
contained in an object, which is also identifiable in the 3D images, is
symbolically reconstructed. The 3D feature obtained in this way is then
registered by 3D-3D registration with the 3D image data record.