A method for eddy current measurement and compensation system for magnetic resonance imaging

The invention discloses a vortex measurement and compensation method for a nuclear magnetic resonance imaging system. The method is characterized by comprising the following steps of: (1) applying gradient pulse on a sample by using the nuclear magnetic resonance imaging system; (2) exciting the sample by using 90 DEG of pulse, and collecting a free fading signal generated by the sample after being excited by the 90 DEG of pulse; (3) fitting a time sequence of the free fading signal by using a multi-index function to obtain a required correction parameter; and (4) outputting the correction parameter in a spectrometer to realize vortex compensation. According to the method disclosed by the invention, integral vortex phase information can be collected efficiently according to the vortex measurement sequence; the position of the sample can be precisely located through a test bracket; a vortex curve can be fitted rapidly and precisely by using four sets of index function models; and the optimization of the compensation effect can be realized by iterating correction amplitude constants for many times.