Virtual trajectory planning

A medical system, comprising:

• at least one computer configured to:
• acquire image data which describes the three-dimensional virtual representation of the patient's body part;
• determine position data via a tracking system operatively coupled with the at least one computer, wherein the position data tracks a position of a user's head in a co-ordinate system, wherein the position data describes a spatial position of a visual axis of the user within the co-ordinate system;
• determine visualization data based on the image data and the position data, wherein the visualization data describes an image of the virtual representation of the patient's body part as seen along the user's visual axis within the co-ordinate system;
• and
• determine virtual-world trajectory data based on the position data, wherein the virtual-world trajectory data describes the spatial position of the virtual trajectory with respect to the virtual representation of the patient's body part within the co-ordinate system, wherein the spatial position of the virtual trajectory within the co-ordinate system is defined to coincide with and to move with the spatial position of the user's visual axis as the visual axis of the user is moved within the co-ordinate system;
• at least one electronic data storage device storing at least one of the trajectory data and image data;
• and
• a display device displaying at least the visualization data to a user, wherein the at least one computer is operably coupled to the at least one electronic data storage device for acquiring, from the at least one electronic data storage device, at least one of the trajectory data and the image data, and the display device for issuing a control signal to the display device for controlling the operation of the display device on the basis of at least one of the trajectory data and the image data.