Apparatus, method and software for tracking an object

摘要

The system has a control unit (50) detecting a pattern of harmonic frequencies of fundamental frequency present in a signal provided by a position sensor responsive to an interaction of an interfering article with an energy field. The unit compares the pattern to harmonic frequency patterns in a database to identify the article for correcting the signal in order to determine position coordinates of a probe. The position sensor fixed to the object generates the signal responsive to the energy field that is generated by a set of radiators. The control unit corrects the signal responsive to the identification and a magnitude of the harmonic frequencies in the detected pattern. Independent claims are also included for the following: (a) a method for tracking an object in a body of a patient in the presence an interfering article (b) a computer software product for tracking an object in a body of a patient in the presence of an interfering article.