An imaging apparatus for imaging a first object within a second object, the imaging apparatus comprising: - a representation providing unit for providing a three-dimensional representation of the second object, wherein the three-dimensional representation includes a representation of a surface of the second object, - a position providing unit for providing the position of the first object relative to the position of the second object, - a projection unit for determining a projection of the first object onto the representation of the surface of the second object based on the provided position of the first object, wherein the projection is a two-dimensional projection that depends on the spatial relationship between the first object and the second object, and - a display for displaying the projection of the first object on the representation of the surface of the second object, characterized in that, the projection unit is adapted to: - calculate for different surface positions on the representation of the surface of the second object a projection value that depends on the distance between the respective surface position and a further position that depends on the provided position of the first object, - provide assignments between projection values and visualization properties, and - assign visualization properties to the surface positions based on the calculated projection values and the provided assignments, thereby determining the projection. - a representation providing unit for providing a three-dimensional representation of the second object, wherein the three-dimensional representation includes a representation of a surface of the second object, - a position providing unit for providing the position of the first object relative to the position of the second object, - a projection unit for determining a projection of the first object onto the representation of the surface of the second object based on the provided position of the first object, wherein the projection is a two-dimensional projection that depends on the spatial relationship between the first object and the second object, and - a display for displaying the projection of the first object on the representation of the surface of the second object, characterized in that, the projection unit is adapted to: - calculate for different surface positions on the representation of the surface of the second object a projection value that depends on the distance between the respective surface position and a further position that depends on the provided position of the first object, - provide assignments between projection values and visualization properties, and - assign visualization properties to the surface positions based on the calculated projection values and the provided assignments, thereby determining the projection. - calculate for different surface positions on the representation of the surface of the second object a projection value that depends on the distance between the respective surface position and a further position that depends on the provided position of the first object, - provide assignments between projection values and visualization properties, and - assign visualization properties to the surface positions based on the calculated projection values and the provided assignments, thereby determining the projection.