GENERALIZED EIGENSYSTEM TECHNIQUES FOR THE INVERSE PROBLEM OF ELECTROCARDIOGRAPHY APPLIED TO A REALISTIC HEART-TORSO GEOMETRY

We have previously proposed two novel solutions Iso to the inverse pro blem of electrocardiography, the generalized eigensystem technique (GE S) and the modified generalized eigensystem technique (tGES), and have compared these techniques with other numerical techniques using both homogeneous and inhomogeneous eccentric spheres model problems. In tho se studies we found our generalized eigensystem approaches generally g ave superior performance over both truncated singular value decomposit ion (SVD) and zero-order Tikhonov regularization (TIK). In this paper we extend the comparison to the case of a realistic heart-torso geomet ry. With this model, the GES and tGES approaches again provide smaller relative errors between the true potentials and the numerically deriv ed potentials than the other methods studied, In addition, the isopote ntial maps recovered using GES and tGES appear to be more accurate tha n the maps recovered using either SVD and TIK.