Measurement and correction of gradient-induced cross-term magnetic fields in an EPI sequence

摘要

A method is disclosed for determining a gradient-induced cross-term magnetic field in a magnetic resonance imaging (MRI) system comprising: positioning an object in a static magnetic field; applying a radio frequency (RF) saturation pulse that spatially saturates nuclei of a slice of the object and applying an echo planar imaging (EPI) sequence to form an image of a slice of the object; generating a cross-field correction factor by analyzing the spatial distribution of the saturation line in the image.