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Abstract

A computer-assisted surgery system for tracking an object during surgery comprises two trackable devices secured to two parts of an object. The devices each have optical elements arranged in geometrical patterns. The devices are secured separately to the object so that the devices are at least partially detectable from an overlapping range of directions, so that a combinative geometrical pattern is defined from a combination of at least part of the optical elements from the trackable devices. A sensor unit detects tracking data on any tracked geometrical pattern. A pattern identifier identifies, from known pattern data for the geometrical patterns, which of the geometrical patterns is being tracked. A position and orientation calculator calculates position and orientation of the object as a function of tracking data on an identified geometrical pattern and of a known spatial relation between the identified geometrical pattern and the object. A method for tracking an object is also provided.

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First Claim