IMPROVEMENT IN IMPEDANCE-BASED POSITION TRACKING PERFORMANCE USING SCATTERED INTERPOLATION

摘要

To provide a method and system for impedance-based position tracking of a medical device.SOLUTION: A method includes receiving from a calibration probe multiple data points acquired in an organ of a patient, each data point including (i) a corresponding position of the calibration probe and (ii) a corresponding set of electrical values indicative of respective impedances between the position and multiple electrodes attached externally to the body of the patient. A mapping between sets of the electrical values and respective positions in the organ is constructed as follows for each received data point: if the mapping already contains one or more existing data points in a predefined vicinity of the data point, the one or more existing data points are adjusted responsively to the received data point; and if the predefined vicinity does not contain any existing data points, the received data point is added to the mapping. A position of a medical probe is subsequently tracked in the organ using the mapping.SELECTED DRAWING: Figure 1