Fig. 8.

(A) Planar wave activation across a circular catheter, estimated using a cosine-fit technique. Activation times at the 8 electrodes are fit to the translated $\cos \theta$ function as shown in a least-squares sense. (B) Circular wave conduction velocity and focal source, s, estimated from an arbitrary set of recording points at positions x_i, with x₀ being the point of earliest activation. The distances of each point from the focal source and x₀ are denoted by d_i and r_i, respectively.