Schematic diagram of ARI imaging and validation in PVC patients.

<p>(a): Experimental recordings include cross-sectional CT slices showing detailed heart geometry and torso boundaries, butterfly plot of multiple-channel ECGs and local activation time maps recorded during EP study. (b): Realistic heart-torso model (blue dots showing body surface electrodes). (c): Endocardial surface of ARI maps by applying ARI imaging. (d): ARI extraction of individual recording sites from unipolar electrograms. (e): Interpolated endocardial surface of ARI maps from CARTO system. 3D = 3-dimensional; ARI = activation recovery interval; CT = computed tomographic; ECG = electrocardiogram; EP = electrophysiology; LV = left ventricle; PVC = premature ventricular contraction; RV = right ventricle.