Abstract: The invention relates to a method and device for referencing between a data set, which describes geometrically the spatial model of a body, and the real physical environment in which the body is placed. A three-dimensional position reference body is used on the real body. The position reference body has one or more elementary bodies or markers whose 3-dimensional position can be detected with sensors and which define a fixed geometric reference with respect to the center of gravity of the body or to other body reference volumes. For registration, the position reference body and/or its elementary bodies are correlated in the data model and in the physical world.

Abstract: The invention relates to a method and a device for instrument, bone segment, tissue and organ navigation. The general problem covered by the invention relates to referencing between a data set (that geometrically describes the spatial model of a body) and the real physical environment in which said body is located. For referencing, a three-dimensional position reference body is used or placed in the real body, said position reference body consisting of one or more elementary bodies (markers) that can be spatially and sensorially detected and defining a fixed geometric reference with respect to the center of gravity of the body or the other reference volumes of the body. A correlation of the position reference body or its elementary body is performed in the data model and in the physical world for registration.