Dixon type water / fat separation and MRI using a preliminary knowledge of the main magnetic field inhomogeneity

摘要

The present invention relates to a method for MR imaging of at least two species with different MR spectra. One object of the present invention is to provide a method for enabling Dixon water / fat separation even when a large field of view is required. The method according to the present invention, a body disposed in the examination volume of a) MR apparatus, by exposing the imaging sequence of the switching magnetic field gradients and RF pulses, to generate at least one echo signal, b) said at least one One of collecting echo signals, c) a multi-peak spectral model, based on the prior knowledge of the spatial variation of the main magnetic field B ₀ in the examination volume, the for collected at least one echo signal of at least two chemical species The signal contribution is separated, d) comprising the step of reconstructing an MR image from at least one species of the signal contribution of the species. Furthermore, the invention relates to a MR apparatus, and a computer program executed on a MR system.