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MRI using Dixon type water / fat separation and prior knowledge on main magnetic field inhomogeneity
MRI using Dixon type water / fat separation and prior knowledge on main magnetic field inhomogeneity
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机译:使用Dixon型水/脂肪分离技术进行MRI和主要磁场非均匀性的先验知识
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摘要
The invention relates to a method of MR imaging of at least two chemical species having different MR spectra. It is an object of the invention to provide a method that enables Dixon water/fat separation in cases in which a large field-of-view is required. The method of the invention comprises the steps of: a) generating at least one echo signal by subjecting a body placed in the examination volume of a MR device to an imaging sequence of RF pulses and switched magnetic field gradients; b) acquiring the at least one echo signal; c) separating signal contributions of the at least two chemical species to the at least one acquired echo signal on the basis of a spectral model and prior knowledge about the spatial variation of the main magnetic field B 0 in the examination volume; and d) reconstructing a MR image from the signal contributions of at least one of the chemical species. Moreover the invention relates to a MR device and to a computer program to be run on a MR device.
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