Accurate knowledge of magnetic field
distribution is necessary for RF shimming and calibration of parallel transmit
systems. The incident field distribution depends on relative location of transmit array to sample,
also magnitude and phase of coil current(thereby, magnetic field) vary with different
sample loading. The RF maps of each coil can be estimated by localizing the
transmit array in the image space and circulating RF currents in each coil. In
this study, parallel transmit system RF shimming pulses are designed by using
transmit coils locator information and coil current measurement without
performing experimental B1 mapping.
