Method and apparatus for acquiring B1 magnetic field phase information

摘要

A system acquires RF magnetic field information, i.e. B1 magnetic field information in response to generated RF pulses applied to a target object via at least one of a plurality of RF coil elements in a MRI system. The system acquires first B1 magnetic field phase information of a B1 magnetic field formed by respective RF coil elements (e.g. by transmitting with one of the RF coil elements only) and acquires second B1 magnetic field phase information of a B1 magnetic field formed by a combination of two or more RF coil elements. The system acquires third information comprising B1 magnetic field phase information by combining the first information and the second information and processes the first, second and third information in providing a B1 map indicating spatial distribution of a B1 magnetic field. By suitably selecting the driven coil elements, the transmission B1 phase information can be separated from the reception B1 phase information.