Removal of far-field signals from electrophysiology information

One or more non-transitory computer-readable media having instructions which, when executed by a processor, cause the processor to perform a method comprising:

• computing first reconstructed electrophysiological signals on a cardiac envelope based on geometry data and the electrophysiological data, wherein the electrophysiological data represents electrophysiological signals measured non-invasively from locations distributed across a body surface, and the geometry data represents geometry for the cardiac envelope and geometry for the locations distributed on the body surface where the electrophysiological signals are measured;
• computing second reconstructed electrophysiological signals on the cardiac envelope based on the geometry data and the electrophysiological data, the second reconstructed electrophysiological signals being representative of far-field signal components;
• and
• determine near-field components for the electrophysiological signals for at least a portion of the cardiac envelope based on the first and second reconstructed electrophysiological signals.

The method of claim 14, wherein placing at least some source nodes comprises:

• placing body source nodes a uniform distance radially outwardly from the body surface;
• or
• computing a distance between the locations on the body surface where measurements are made and respective cardiac nodes on the cardiac envelope;
• and
• adaptively placing cardiac source nodes radially inwardly from the cardiac envelope based on the computed distance.

A system comprising:

• memory to store data and executable instructions, the data including electrophysiological data representing electrophysiological signals measured from locations distributed across a body surface, and geometry data representing geometry for a surface of interest and geometry for the locations distributed on the body surface where the electrophysiological signals are measured;
• and
• at least one processor to access the memory and execute the instructions to at least:
• compute first reconstructed electrophysiological signals on the surface of interest based on the geometry data and the electrophysiological data;
• compute second reconstructed electrophysiological signals on the surface of interest based on the geometry data and the electrophysiological data, the second reconstructed electrophysiological signals being representative of far-field signal components;
• and
• determine near-field components for the electrophysiological signals for at least a portion of the surface of interest based on the first and second reconstructed electrophysiological signals for the portion of the surface of interest.