LAYERED MULTl-ACTIVATION LOCAL ACTIVATION TIMES (LAT) MAPPING

A system, comprising:

• a catheter having electrodes positioned at respective cardiac tissue locations in a given region of a surface of a cardiac chamber of a heart of a patient;
• a tracking system for tracking the electrodes at the respective cardiac tissue locations in a given region of a surface of a cardiac chamber of a heart of a patient;
• an interface, which is configured to acquire a plurality of data points from the electrodes, the data points comprising electrical activation (EA) values measured at the respective cardiac tissue locations;
• and
• a processor, which is configured to perform:
• generating multiple EA graphs of connected data points by applying a graph connectivity criterion to the data points;
• generating disconnected EA graph families of connected data points and assigning EA values to the disconnected EA graph families,
• generating multiple EA layers of disconnected EA graph families;
• constructing an EA map by aggregating the EA graph families indicating normal tissue in one or more EA layers and aggregating the EA graph families indicating abnormal tissue in one or more EA layers;
• overlaying the EA map with the multiple EA layers on a modeled surface of the cardiac chamber, with the EA layers indicating abnormal tissue and the EA layers indicating normal tissue partially overlapping each other;
• and
• displaying the EA map on the modeled surface of the cardiac chamber with the multiple overlaid EA layers to a user, with a graphical indication distinguishing between the EA layers identifying normal tissue and abnormal tissue.