Special treatments for valve/hole regions in endocardial potential estimates from non-contact intracavitary probes.

The EnSite intracavitary probe system developed by Endocardial Solutions, Inc (St. Jude Medical, St. Paul, MN) was used to simultaneously record geometric information, probe potentials, and endocardial potentials within the right atria for four patients.

A comparison of two methods for choosing the regularization parameter for the inverse problem of electrocardiography.

We have previously compared both generalized eigensystem (GES) and Tikhonov regularization methods for estimating epicardial potentials from measured body surface potentials. Both of these methods require the choice of a regularization parameter. In this study we compare two methods for choosing this parameter: the Composite Residual Error and Smoothing Operator (CRESO) method, and a new Zero Crossing (ZC) method.