Method and apparatus for acquiring B1 magnetic field information

摘要

A system acquires RF magnetic field information (B1 magnetic field information) in response to generated radio frequency (RF) pulses applied to a target object via at least one of a plurality of RF coil elements in a magnetic resonance imaging (MRI) system. The system acquires first information comprising B1 magnetic field phase information of a B1 magnetic field formed by the respective RF coil elements and acquires second information comprising B1 magnetic field phase information of a B1 magnetic field formed by a combination of two or more of a plurality of 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.

主权项

1. A method of acquiring B1 magnetic field information from RF magnetic field information in response to generated radio frequency (RF) pulses applied to a target object via at least one of a plurality of RF coil elements in a magnetic resonance imaging (MRI) system, the method comprising:
acquiring first information comprising B1 magnetic field phase information of a B1 magnetic field formed by the respective RF coil elements; acquiring second information comprising B1 magnetic field phase information of a B1 magnetic field formed by a combination of two or more of the plurality of RF coil elements; acquiring phase information of transmission RF magnetic fields (B1+ magnetic fields) as third information comprising B1 magnetic field phase information by eliminating phase information of a reception RF magnetic field (B1− magnetic field) from the first information by using the second information; applying RF pulses to the target object by activating the plurality of RF coil elements using signals having individual magnitudes and phases, respectively, based on the third information, receiving responses corresponding to the RF pulses from the target object; and generating an MR image regarding to the target object based on the response.