PHASE SENSITIVE INVERSION RECOVERY MRI WITH WATER/FAT SEPARATION

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 PSIR-based MR imaging method which enables distinction between myocardial scar and myocardial triglyceride deposition. The method of the invention comprises the steps of: a) generating echo signals at two or more different echo times by subjecting an object (10) positioned in the examination volume of a MR device (1) to an imaging sequence of RF pulses and switched magnetic field gradients, which imaging sequence is an inversion recovery sequence comprising an inversion RF pulse followed by an excitation RF pulse after an inversion recovery time; b) acquiring the echo signals; c) separating signal contributions of the at least two chemical species to the acquired echo signals; and d) reconstructing a phase-sensitive MR image (28, 29) 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.

主权项

1. A method of magnetic resonance (MR) imaging of at least two chemical species having different MR spectra, the method comprising:
a) generating echo signals at two or more different echo times by subjecting an object positioned in the examination volume of a MR device to an imaging sequence of radio frequency (RF) pulses and switched magnetic field gradients, which imaging sequence is an inversion recovery sequence comprising an inversion RF pulse followed by an excitation RF pulse after an inversion recovery time; b) acquiring the echo signals; c) separating signal contributions of the at least two chemical species to the acquired echo signals; and d) reconstructing a phase-sensitive MR image from the signal contributions of at least one of the chemical species, wherein the step of reconstructing the phase-sensitive MR image from the signal contributions of at least one of the chemical species involves (i) differentiation between polarity and background phasing and (ii) phase correction of the signal contributions of the respective chemical species according to the background phasing.