A method for generating a graphical 3D computer model of anatomical structures in a selectable pre-, intra-, or postoperative status that includes: (A) receiving a preoperative first medical 3D image data set of anatomical structures to be treated of a patient (B) generating a first graphical 3D computer model of the anatomical structures to be treated in the form of a digital data set using the data received in step (A) (C) receiving a second medical 2D or 3D image data set of the anatomical structures to be treated (D) generating a second graphical 2D or 3D computer model of the anatomical structures to be treated in the form of a digital data set using the data received in step (C) and (E) carrying out an image registration process of the first graphical 3D computer model using the second graphical 2D or 3D computer model.
