The invention relates to an imaging apparatus for imaging a first object (10) like a tip of a catheter within a second object being, for instance, a vascular structure of a person. A three-dimensional representation of the second object including a representation of a surface (23) of the second object and the position of the first object relative to the position of the second object are provided, and a projection (22) of the first object onto the representation of the surface of the second object is determined and shown to a user like a physician on a display. The three-dimensional spatial relationship between the first object and the second object is thereby shown in a way that is very native for the user, i.e. a visualization can be provided, which allows the user to easily and accurately grasp the three-dimensional spatial relationship between the first object and the second object.
