System and method for correction of inhomogeneous fields

摘要

A method for determining a location of an object in a three-dimensional localization field created by a localization system includes the following steps: providing a catheter having known spacing between electrodes; providing a lookup table of data correlating locations of an object within the localization field with measurements made by the localization system; placing the catheter into the localization field; using the localization system to determine the location of the electrodes based on the lookup table; calculating an observed distance between electrodes; comparing the observed distance to the known electrode spacing; and adjusting the lookup table to more accurately measure the spacing of the electrodes. A Kernel function, such as the derivative of a Gaussian function, may be used to update the lookup table.

主权项

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.