ECGi Metrics in Atrial Fibrillation Dependency on Epicardium Segmentation

Noninvasive electrocardiographic imaging (ECGi) is a useful tool that can be used to guide ablation procedures in atrial fibrillation (AF patients). Most ECGi resolutions are based on the Boundary Element Method, and thus application of Green's theorem, that requires that electrical sources reside inside a closed volume. The objective of this work is to quantify the error in atrial fibrillation metrics than can be expected if two volumes are segmented for the atria instead of just one. Our results show that segmenting the atria of the patients into two volumes instead of one does impact on rotor-related AF metrics that can be derived from ECGi whereas dominant-frequency metrics are less affected.