Figure 4

Velocity offset with asymmetric and symmetric velocity encoding. Colors indicate different scanner samples. On the left, results of three samples of one type, on the right, the results of three samples of another type. Symmetric encoding was lower, but only significant in type 1 (type 1: -0.4 cm/s, P < 0.01, type 2: -0.6 cm/s, P = 0.40).