Patent ID: 6741948
Filing Date: 2004-05-25
Classification: A61B,G01S,G02B

Abstract:
An apparatus for fixing at least one location in an examination field with respect to a coordinate system, comprising:a targeting device for determining a first location within the examination field with respect to the coordinate system and for providing coordinates of the first location as a first coordinate set allocated to the first location; a topology recording device for obtaining a recording of topological data in a spatially extended area around the first location in the examination field; and means for comparing at least two recordings of topological data, the means for comparing adapted to determine a displacement of the examination field with respect to the coordinate system, the means for comparing adapted to change the coordinates of the first coordinate set depending upon the determined displacement such that the changed coordinates substantially correspond to the coordinates of the first location within the examination field after the displacement thereof, wherein the targeting device comprises a pointer adapted to be moved by a user's hand, the pointer comprising a pointer tip for contacting the first location in the examination field, and a position detecting device adapted to detect the position of the pointer tip with respect to the coordinate system.