Patent ID: 9549689
Date: 2017-01-24
CPC Classifications: A61B

Claim:
1. A method for determining a location of an object in a three-dimensional localization field created by a localization computer system, comprising: providing a catheter having a plurality of electrodes, each of which is spaced from an adjacent electrode by a known electrode spacing distance; providing a three-dimensional lookup table for use by the localization computer system, wherein the table comprises reference data correlating locations of an object within the localization field with measurements made by the localization computer system when the object is at different locations; placing the catheter into the localization field; using the localization computer system to determine the location of each of the plurality of electrodes based on the reference data in the three-dimensional lookup table; calculating, with the localization computer system, an observed distance between each pair of adjacent electrodes from the determined locations of each of the plurality of electrodes; determining, with the localization computer system, an error signal by comparing the observed distance between at least one pair of adjacent electrodes to the known electrode spacing between the at least one pair of adjacent electrodes; and adjusting, with the localization computer system, the reference data in the three-dimensional lookup table based on the error signal to more accurately measure the spacing of the electrodes.