Figure 4
The RF pulse calibration for the randomized B 1 fields of the two-channel transmission system. Each channel makes a random RF field in both magnitude and phase. (a) The magnitude and (b) phase distribution over (x, y) of the RF field generated by channel 1. (c) The composite field made by quadrature excitation. (d) The composite field made by the RF pulse calibration. (e) The magnitude distribution of the composite RF field generated by the quadrature excitation and the RF pulse calibration.