US Patent 7605826 Augmented reality guided instrument positioning with depth determining graphics

There is provided a method for augmented reality guided instrument positioning. At least one graphics proximity marker is determined for indicating a proximity of a predetermined portion of an instrument to a target. The at least one graphics proximity marker is rendered such that the proximity of the predetermined portion of the instrument to the target is ascertainable based on a position of a marker on the instrument with respect to the at least one graphics proximity marker.