Method and apparatus for acquiring B1 magnetic field information

摘要

A method acquires RF magnetic field information (B1 magnetic field information) in response to generated radio frequency (RF) pulses in a magnetic resonance imaging (MRI) system. An RF excitation pulse sequence is generated, and the generated RF excitation pulse sequence includes a plurality of RF excitation pulses individually having different flip angles. The generated RF excitation pulse sequence is transmitted to a target object. RF echo response signals are received from the target object corresponding to the plurality of RF excitation pulses and B1 information is acquired by processing the received RF echo response signals.

主权项

1. A method of acquiring B1 magnetic field information in response to generated radio frequency (RF) pulses in a magnetic resonance imaging (MRI) system, the method comprising:
generating an RF excitation pulse sequence including interleaved first, second and third RF excitation pulses which are individually associated with different flip angles; transmitting the generated RF excitation pulse sequence to a target object; receiving RF echo response signals from the target object corresponding to the first, second and third RF excitation pulses; and acquiring B1 information by processing the received RF echo response signals, wherein, the first RF excitation pulse is associated with a first flip angle α, the second RF excitation pulse is associated with a second flip angle β, and the third RF excitation pulse is associated with a third flip angle γ, and the second flip angle β and the third flip angle γ are different integer multiples of the first flip angle α, and where the acquiring of the B1 information comprises; acquiring first ratio information determined using a magnitude of an echo response signal associated with the first RF excitation pulse and a magnitude of an echo response signal associated with the second RF excitation pulse; acquiring second ratio information determined using a magnitude of an echo response signal associated with the second RF excitation pulse and a magnitude of an echo response signal associated with the third RF excitation pulse, and acquiring a first flip angle α value of the first RF excitation pulse by using the first ratio information and the second ratio information.