1. A method for displaying images in a medical navigation system assisted by x-ray images, said method comprising: calibrating an x-ray device in the medical navigation system; producing a plurality of two-dimensional x-ray images of a patient using the x-ray device; during the producing step, determining positions of the x-ray device using the medical navigation system, said determining step producing positional data; converting data associated with the two-dimensional x-ray images into three-dimensional data; transferring (i) the two-dimensional x-ray images, (ii) x-ray device positional information corresponding to the two-dimension x-ray images, and (iii) the three-dimensional data to the navigation system; and displaying at least the two-dimensional x-ray images on an image output of the medical navigation system.