Patent ID: 9042962
Filing Date: 2015-05-26
Classification: A61B,A61N,G01S,H04B

Abstract:
1. A method for tracking a position of a positioning device configured to be placed inside of a body of a patient, said method comprising the steps: arranging the positioning device in relation to a target area in a tracking environment, said positioning device comprising at least one transmitter, transmitting an electromagnetic transmit signal at a specified frequency from each transmitter, and providing a receiver comprising a plurality of electrostatically shielded receiving elements arranged outside the tracking environment, and measuring a receive signal at each receiving element, said transmitter(s) and receiver operating in a near field region, retrieving, from a memory unit, a separate model for each receiving element, obtained by a calibrating method comprising: estimating the position of the positioning device by comparing the retrieved model for each receiving element with the measured received signal for each receiving element, wherein the method comprising the further steps of: transmitting a reference transmit signal from at least one reference transmitter being arranged at a predetermined distance from each receiving element, measuring a reference receive signal at each receiving element, and weighting the measured receive signal from each receiving element to coincide with a reference model, to obtain an automatic adjustment of the receiving elements during operation.