METHOD AND APPARATUS TO COMPENSATE FOR IMAGE ARTIFACTS CAUSED BY MAGNETIC VIBRATION IN MAGNETIC RESONANCE IMAGING SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a method and an apparatus for reducing image artifacts caused by magnetic vibration in a magnetic resonance(MR) imaging system. SOLUTION: A systematic method for a magnetic field vibration quantification and compensation is provided, which includes correction of a vibration error induced in a k-space data corresponding to an MR image. The vibration error can be at least one of a spatially independent phase error caused by a spatially invariant magnetic field, a kx-space displacement error caused by a perturbation gradient along the readout direction, a ky-space displacement error caused by a perturbation gradient along the phase-encoding direction, and a slice selection error caused by a perturbation gradient along the slice- selection direction. The vibration error component is used to appropriately modify and/or add to its corresponding magnetic field component or its equivalent in the pulse sequence.