Apparatus and method for controlling pulse sequence of magnetic resonance imaging system

The present invention provides an apparatus and method for controlling a pulse sequence of a magnetic resonance (MR) imaging system, the MR imaging system comprising a radio frequency magnetic field coil and a gradient magnetic field coil, the apparatus for controlling a pulse sequence of the MR imaging system comprising a radio frequency driving unit and a gradient driving unit. The gradient driving unit is used for applying a first motion probing gradient (MPG) pulse and a second MPG pulse to the gradient magnetic field coil successively. The radio frequency driving unit is used for applying a radio frequency excitation pulse to the radio frequency magnetic field coil before the first MPG pulse is applied, and for applying a first 90-degree radio frequency refocusing pulse, a 180-degree radio frequency refocusing pulse and a second 90-degree radio frequency refocusing pulse to the radio frequency magnetic field coil successively between a time when the first MPG pulse is applied and a time when the second MPG pulse is applied.