Patent ID: 6419680
Filing Date: 2002-07-16
Classification: A61B,G06T

Abstract:
A fiducial marker comprising:a base; a body structure connected to the base, the body structure configured and dimensional as an annular dome defining a sealed cavity therein; an indented central depression being defined by the annular dome, the indented central depression defining an inwardly sloping top surface of the body structure and a central portion, the central portion being a bottom of the indented central depression and intersection of the sloping top surface, the central portion defining a stable positioning point, the stable positioning point being adapted for use with a tip of a stereotactic locating probe; a first marker having an annular shape; a second marker material disposed within the sealed cavity and being visible to image scanning, wherein the first marker is positioned in juxtaposition with the second marker and a first centroid being defined by the first marker and a second centroid being defined by the second marker, wherein the first centroid and the second centroid are configured to be coincident, the stable positioning point being configured to be approximately coincident with the centroid of the first marker and the second marker.