Figure 1: The 252-lead Vest Records Torso Surface Electrograms.

Knowing the precise relationship between the electrocardiography (ECG) electrodes and the epicardial cardiac surface from the computed tomography (CT) scan, the system solves the inverse problem to reconstruct epicardial electrograms and 3D maps such as isopotential and isochronal maps. A: 252 electrode vest; B: heart-torso geometry (CT scan); C: acquisition of the cardiac signals (forward problem); D: pre or per-procedural instantaneous maps (inverse problem).