Non-contact cardiac mapping, including resolution map

A method comprising:

• inserting a catheter into a heart cavity having an endocardium surface, the catheter comprising multiple, spatially distributed electrodes mounted on a device capable of deploying the electrodes into a three dimensional shape;
• after insertion of the catheter into the heart cavity, deploying the electrodes into the three dimensional shape;
• measuring signals at the catheter electrodes in response to electrical activity in the heart cavity;
• determining physiological information at multiple locations of the endocardium surface based on the measured signals and positions of the catheter electrodes with respect to the endocardium surface;
• and
• wherein the determined physiological information comprises electrical potential values at the multiple locations of endocardium surface at different phases of the heart beat cycle, and wherein the method further comprises determining frequency dependent features of converting the electrical potential values into a frequency representation of electrical activity at multiple locations of the endocardium surface during the heart beat cycle.

A system comprising:

• a catheter configured to be inserted into a heart cavity having an endocardium surface, the catheter comprising multiple, spatially distributed electrodes mounted on a device capable of deploying the electrodes into a three dimensional shape, the multiple electrodes configured to be deployed into the three dimensional shape after insertion of the catheter into the heart cavity and to measure signals in response to electrical activity electrical activity in the heart cavity;
• and
• a processing unit configured to determine physiological information at multiple locations of the endocardium surface based on the measured signals and positions of the electrodes with respect to the endocardium surface;
• wherein the determined physiological information comprises electrical potential values at the multiple locations of endocardium surface at different phases of the heart beat cycle, and wherein the processing unit configured to determine physiological information is further configured to determine frequency dependent features by converting the electrical potential values into a frequency representation of electrical activity at multiple locations of the endocardium surface during the heart beat cycle.