An apparatus having an insertable portion for holding a position sensor is disclosed. The position sensor can transmit a signal indicative of its position with respect to a field generator. The insertable portion of the catheter has fiducial markings that are detectable by an imaging modality when the...http://www.google.de/patents/US20020143317?utm_source=gb-gplus-sharePatent US20020143317 - Device and method for registering a position sensor in an anatomical body
