1. A method for mapping the electrical activity of a targeted tissue region in a body, the method comprising: sensing a plurality of signals over a period of time with a plurality of electrodes positioned within or near the targeted tissue region; determining vector angles for the plurality of signals; generating data sets for each of the plurality of electrodes, wherein the data sets are based on the plurality of signals sensed by the plurality of electrodes and include the determined vector angles for the plurality of signals; and generating a diagnostic image using the generated data sets.