Vortex measurement and compensation method for nuclear magnetic resonance imaging system

The present invention discloses a method for eddy current measurement and compensation for the magnetic resonance imaging system, characterized by comprising the steps of: (1) applying a gradient pulse of the sample using nuclear magnetic resonance imaging system; (2) using the 90 ° excitation pulse samples were collected after the free decay signal 90 ° excitation pulse is generated in the sample; (3) multi-exponential decay function fit the free time-series signals, to obtain the desired correction parameter; (4) to output the correction parameters eddy current compensation achieved spectrometer. Eddy current measurement sequences provided by the invention can efficiently capture a complete eddy current phase information; Test sample holder able to pinpoint the location; using four exponential model can be quickly and accurately fitted vortex curve; through multiple iterations to correct the amplitude constant, optimized to achieve the compensation effect.