METHOD AND APPARATUS FOR REDUCING 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 the step quantifying a vibration error component included in the magnetic field configured to acquire k-space data corresponding to an MR image and that for correcting the k-space data using the vibration error component. The vibration-induced magnetic field perturbation includes a spatially invariant magnetic field, a spatially linear readout magnetic field gradient, a spatially linear phase-encoding magnetic field gradient, and a spatially linear slice-selection magnetic field gradient. The vibration error component can be at least one of a spatially independent phase error of the spatially invariant magnetic field, a kx-space displacement error of the spatially linear readout magnetic field gradient, a ky-space displacement error of the spatially linear phase-encoding magnetic field gradient, and a slice selection error of the spatially linear slice-selection magnetic field gradient.