Patent ID: 7684850
Filing Date: 2010-03-23
Classification: A61B

Abstract:
1. A method for position sensing, comprising: placing at a known position within a body of a subject a reference probe comprising at least one reference electrode; passing first electrical currents through the body between the at least one reference electrode and a plurality of body surface electrodes while the reference probe is in the known position; measuring first characteristics of the first electrical currents; using the first characteristics to generate an approximation of the known position of the reference probe; determining a correction factor based on a relationship between the approximation and the known position; placing a target probe comprising at least one target electrode within the body of the subject; passing second electrical currents through the body between the at least one target electrode and the plurality of body surface electrodes; measuring respective second characteristics of the second electrical currents; using the second characteristics to generate a calculated position of the target probe; and applying the correction factor to correct the calculated position.