1. A method for registering an image data set for visualizing internal areas of the body, said method comprising: determining a relative position of (i) an imaging device, and (ii) an external body part associated with an internal area of the body; producing an image data set for the internal area of the body by means of the imaging device; determining a spatial position of the external body part; and registering or assigning the image data of the internal area of the body according to relative position, with respect to the spatial position of the external body part, on the basis of the relative positional information.