Figure 2.

Estimation of the localization performance of patient-specific site localization. Out of 500 pacing sites (pooled from 18 ablation procedures), for which there were known electroanatomic (EA) coordinates together with corresponding 3-variable ECG data, sets of “target” pacing sites with 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 and 15 neighbors (as different training sets) within radius of 10, 15, 20, 25, 30, 35, 40, 45, and 50 millimeters were identified. For each selected “target” site, EA coordinates of its each training set together with 3 ECG variables (lead III, V2, and V6) were used to calculate patient-specific regression coefficients and these were then used, in turn, to predict the location (in terms of EA coordinates) of the “target” site; the mean localization error of this prediction was calculated for each set of “target” sites (in millimeters).