Patent ID: 8812079
Filing Date: 2014-08-19
Classification: A61B

Abstract:
1. A method, comprising: generating, using a plurality of magnetic transmitters, a first magnetic field in a region; measuring the first magnetic field without a field perturbing element within the region; introducing a field perturbing element into the region; characterizing multiple images of each magnetic transmitter in the field perturbing element; calculating a reaction magnetic field in the region based on the characterized images; positioning a probe in the region and measuring a perturbed magnetic field at the probe; determining an approximate location of the probe using the perturbed magnetic field; calculating a second reaction field at the approximate location of the probe using the first reaction magnetic field; subtracting the second reaction field from the first magnetic field to determine a second magnetic field; and determining a corrected location of the probe in response to the first magnetic field and the second magnetic field.