Figure 2.

Schematic diagrams of the wave front in different electrode arrangements. (a) 4-Electrodes geometry, (b) 5-electrodes geometry and 2 points (P1 and P2) on the line segments 1–2 and 4–3, (c) 3-electrodes geometry, and (d) 4-electrodes geometry and two extra points on segments 3–1 and 2–3. Arrangements in (b) and (d) are used to measure the ROC in a simulation and in clinical setting respectively (electrodes are colored blue).